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Tang H, Wang M, Li Y, Wang Y. A Study on the Effect and Suppression of Hydrogen Permeation Behavior on the Friction Characteristics of PEEK/PTFE Composites via Molecular Dynamics Simulation. Polymers (Basel) 2024; 16:1000. [PMID: 38611258 PMCID: PMC11013744 DOI: 10.3390/polym16071000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Revised: 03/13/2024] [Accepted: 03/26/2024] [Indexed: 04/14/2024] Open
Abstract
To research the effect of hydrogen permeation on the friction characteristics of the seal materials on the hydrogen equipment, the molecular models of 10% PEEK/PTFE composites and its frictional models were established, respectively, and molecular dynamics (MDs) and giant canonical Monte Carlo (GCMC) methods were used to simulate the diffusion coefficient, dissolution coefficient and permeability coefficient of the hydrogen in PEEK/PTFE composites. The effect of a different amount of hydrogen on the friction and wear of PEEK/PTFE composites was also studied. The results showed that few permeations of the hydrogen gas mainly demonstrated having a positive effect on the surface of the PEEK/PTFE composites, and the wear rate of the PEEK/PTFE composites showed a slight decreasing trend. The wear rate of the PEEK/PTFE composites gradually decreased when more hydrogen molecules penetrated the matrix. With the further penetration of the hydrogen molecules, the wear rate and friction coefficient of the PEEK/PTFE composites rapidly increased, showing a negative effect. With the further penetration of the hydrogen molecule, the friction coefficient of the composite displayed a small fluctuation and then a rapid decreasing trend. Meanwhile, effective improvement measures were proposed, and the introduction of the graphene was verified to be effective to reduce the negative effect of the hydrogen permeation, thereby improving the friction performance of the PEEK/PTFE composites.
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Affiliation(s)
| | | | - Yunlong Li
- School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China; (H.T.); (M.W.); (Y.W.)
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Kim JH, Song A, Park JM, Park JS, Behera S, Cho E, Park YC, Kim NY, Jung JW, Lee SJ, Kim HS. Analogous Design of a Microlayered Silicon Oxide-Based Electrode to the General Electrode Structure for Thin-Film Lithium-Ion Batteries. Adv Mater 2024; 36:e2309183. [PMID: 38160321 DOI: 10.1002/adma.202309183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 12/09/2023] [Indexed: 01/03/2024]
Abstract
Development of miniaturized thin-film lithium-ion batteries (TF-LIBs) using vacuum deposition techniques is crucial for low-scale applications, but addressing low energy density remains a challenge. In this work, structures analogous to SiOx-based thin-film electrodes are designed with close resemblance to traditional LIB slurry formulations including active material, conductive agent, and binder. The thin-film is produced using mid-frequency sputtering with a single hybrid target consisting of SiOx nanoparticles, carbon nanotubes, and polytetrafluoroethylene. The thin-film SiOx/PPFC (plasma-polymerized fluorocarbon) involves a combination of SiOx and conductive carbon within the PPFC matrix. This results in enhanced electronic conductivity and superior elasticity and hardness in comparison to a conventional pure SiOx-based thin-film. The electrochemical performance of the half-cell consisting of thin-film SiOx/PPFC demonstrates remarkable cycling stability, with a capacity retention of 74.8% up to the 1000th cycle at 0.5 C. In addition, a full cell using the LiNi0.6Co0.2Mn0.2O2 thin-film as the cathode material exhibits an exceptional initial capacity of ≈120 mAh g-1 at 0.1 C and cycle performance, marked by a capacity retention of 90.8% from the first cycle to the 500th cycle at a 1 C rate. This work will be a stepping stone for the AM/CB/B composite electrodes in TF-LIBs.
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Affiliation(s)
- Jong Heon Kim
- Texas Materials Institute and Materials Science and Engineering Program, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Aeran Song
- Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea
| | - Ji-Min Park
- Department of Materials Science and Engineering, Chungnam National University, Daejeon, 34134, Republic of Korea
- Department of Energy and Materials Engineering, Dongguk University, Seoul, 04620, Republic of Korea
| | - Jun-Seob Park
- Department of Materials Science and Engineering, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Subhashree Behera
- Department of Materials Science and Engineering, Chungnam National University, Daejeon, 34134, Republic of Korea
- Department of Energy and Materials Engineering, Dongguk University, Seoul, 04620, Republic of Korea
| | - Eunmi Cho
- Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea
| | - Yun Chang Park
- National Nano Fab Centre, Daejeon, 305-806, Republic of Korea
| | - Na-Yeong Kim
- School of Materials Science and Engineering, University of Ulsan (UOU), Ulsan, 44776, Republic of Korea
| | - Ji-Won Jung
- School of Materials Science and Engineering, University of Ulsan (UOU), Ulsan, 44776, Republic of Korea
| | - Sang-Jin Lee
- Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 34114, Republic of Korea
| | - Hyun-Suk Kim
- Department of Materials Science and Engineering, Chungnam National University, Daejeon, 34134, Republic of Korea
- Department of Energy and Materials Engineering, Dongguk University, Seoul, 04620, Republic of Korea
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Lv W, Wang T, Wang Q, Yap KK, Song F, Wang C. Tribological and Mechanochemical Properties of Nanoparticle-Filled Polytetrafluoroethylene Composites under Different Loads. Polymers (Basel) 2024; 16:894. [PMID: 38611152 PMCID: PMC11013283 DOI: 10.3390/polym16070894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Revised: 03/16/2024] [Accepted: 03/18/2024] [Indexed: 04/14/2024] Open
Abstract
For the tribological properties of nanoparticle-modified PTFE, a more comprehensive study has been conducted, but there is still some room for research on tribology behavior, tribofilm formation and structure evolution of polytetrafluoroethylene (PTFE) filled with α-Al2O3 and SiO2 nanoparticles during sliding against steel counterparts under different loads. At the same time, it establishes the linkage and mechanism between the maintenance of mechanical strength and the tribological application of polymers in service and provides corresponding scientific data and theoretical guidance for the long-lasting application of polymer lubrication materials. It is found that both composites exhibit good wear resistance across the pressure of 1 MPa to 10 MPa, with the α-Al2O3/PTFE composite demonstrating better performance stability compared to the SiO2/PTFE composite. The high wear resistance is attributed to the formation of tribofilms at the friction interface. For the α-Al2O3/PTFE, an island-like tribofilm is formed with a thickness ranging from 100 to 200 nm, while the tribofilm of the SiO2/PTFE composite is thinner, measuring approximately 50 to 100 nm, and manifests a striped pattern. The chemical composition, both at the surface and subsurface levels, as well as the morphology of the tribofilms, were studied using FTIR spectrometry, X-ray photoelectron spectroscopy (XPS), and FIB-TEM. It is found that the difference in thickness and microstructure of the tribofilms for the two composites is mainly due to the tribochemistry of the nanoparticles. The α-Al2O3 nanoparticle plays a "cohesion" role during the formation of the tribofilm, which facilitates the formation of a thicker, more uniform, and stronger adhered tribofilm on the metallic counterpart, making it more robust against higher shear stress.
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Affiliation(s)
- Weixuan Lv
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; (W.L.); (Q.W.)
- Center of Materials Science and Opto-Electronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Tingmei Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; (W.L.); (Q.W.)
- Center of Materials Science and Opto-Electronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qihua Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; (W.L.); (Q.W.)
- Center of Materials Science and Opto-Electronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kian Kun Yap
- Tribology Group, Department of Mechanical Engineering, Imperial College London, London SW7 2BX, UK;
| | - Fuzhi Song
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; (W.L.); (Q.W.)
- Qingdao Center of Resource Chemistry & New Materials, Qingdao 266100, China
| | - Chao Wang
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; (W.L.); (Q.W.)
- Qingdao Center of Resource Chemistry & New Materials, Qingdao 266100, China
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Lee T, An J, Chung WJ, Kim H, Cho Y, Song H, Lee H, Kang JH, Choi JW. Non-Electroconductive Polymer Coating on Graphite Mitigating Electrochemical Degradation of PTFE for a Dry-Processed Lithium-Ion Battery Anode. ACS Appl Mater Interfaces 2024; 16:8930-8938. [PMID: 38326747 DOI: 10.1021/acsami.3c18862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Polytetrafluoroethylene (PTFE)-based dry process for lithium-ion batteries is gaining attention as a battery manufacturing scheme can be simplified with drastically reducing environmental damage. However, the electrochemical instability of PTFE in a reducing environment has hampered the realization of the high-performance dry-processed anode. In this study, we present a non-electroconductive and highly ionic-conductive polymer coating on graphite to mitigate the electrochemical degradation of the PTFE binder and minimize the coating resistance. Poly(ethylene oxide) (PEO) and poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) coatings on the anode material effectively inhibit the electron transfer from graphite to PTFE, thereby alleviating the PTFE breakdown. The graphite polymer coatings improved initial Coulombic efficiencies of full cells from 67.2% (bare) to 79.1% (PEO) and 77.8% (P(VDF-TrFE-CFE)) and increased initial discharge capacity from 157.7 mAh g(NCM)-1 (bare) to 185.1 mAh g(NCM)-1 (PEO) and 182.5 mAh g(NCM)-1 (P(VDF-TrFE-CFE)) in the full cells. These outcomes demonstrate that PTFE degradation in the anode can be surmounted by adjusting the electron transfer to the PTFE.
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Affiliation(s)
- Taegeun Lee
- School of Chemical and Biological Engineering and the Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jiwoo An
- School of Chemical and Biological Engineering and the Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Woo Jun Chung
- School of Chemical and Biological Engineering and the Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hyuntae Kim
- School of Chemical and Biological Engineering and the Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Yongil Cho
- Battery Manufacturing Engineering R&D Team, Kia Corporation, 37 Cheoldobangmulgwan-ro, Uiwang-si 16082, Gyeonggi-do, Republic of Korea
| | - Hannah Song
- Battery Manufacturing Engineering R&D Team, Hyundai Motor Company, 37 Cheoldobangmulgwan-ro, Uiwang-si 16082, Gyeonggi-do, Republic of Korea
| | - Hyeonha Lee
- Battery Manufacturing Engineering R&D Team, Kia Corporation, 37 Cheoldobangmulgwan-ro, Uiwang-si 16082, Gyeonggi-do, Republic of Korea
| | - Jong Hun Kang
- School of Chemical and Biological Engineering and the Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Jang Wook Choi
- School of Chemical and Biological Engineering and the Institute of Chemical Processes, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
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Yuan L, Zheng X, Zhu W, Wang B, Chen Y, Xing Y. Study on the Electrical Insulation Properties of Modified PTFE at High Temperatures. Polymers (Basel) 2024; 16:316. [PMID: 38337205 DOI: 10.3390/polym16030316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 01/13/2024] [Accepted: 01/20/2024] [Indexed: 02/12/2024] Open
Abstract
During the operation of multi-electric aircraft, the polytetrafluoroethylene (PTFE) material used to insulate the aviation cable is subjected to a high electric field while working under the extreme conditions of high temperatures for a long time, which can easily cause a partial discharge and even flashover along the surface, which seriously threaten the safe operation of the aircraft. In this paper, the electrical insulation properties of PTFE were regulated via modification by the magnetron sputtering of TiO2 under high temperatures, and modified PTFE with different sputtering times was prepared. The direct current (DC) surface discharge, surface flashover, and electric aging characteristics of modified PTFE were studied under the condition of 20~200 °C, and the mechanisms by which modification by sputtering of TiO2 and high temperature influence the insulation properties were analyzed. The results show that the surface discharge intensity increases with the increase in temperature, the modification by sputtering of TiO2 can significantly inhibit the partial discharge of PTFE, and the flashover voltage first increases and then decreases with the increase in the modification time. The modification by magnetron sputtering can effectively increase the surface potential decay rate of the PTFE, increase the shallow trap energy density, effectively avoid charge accumulation, inhibit the partial discharge phenomenon, and improve the surface electrical insulation and anti-aging properties.
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Affiliation(s)
- Lijian Yuan
- School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
- Shandong Dianliangliang Energy Technology Co., Ltd., Jinan 250000, China
| | - Xu Zheng
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
| | - Wenbo Zhu
- China Southern Power Grid Electric Power Research Institute, Guangzhou 510000, China
| | - Bin Wang
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
| | - Yuanyuan Chen
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
| | - Yunqi Xing
- State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300130, China
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Zhou S, Hu Y, Huang Y, Xu H, Wu D, Wu D, Gao X. Preparation of Polytetrafluoroethylene Superhydrophobic Materials by Femtosecond Laser Processing Technology. Polymers (Basel) 2023; 16:43. [PMID: 38201708 PMCID: PMC10780796 DOI: 10.3390/polym16010043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2023] [Revised: 12/08/2023] [Accepted: 12/17/2023] [Indexed: 01/12/2024] Open
Abstract
In recent years, superhydrophobic surfaces have attracted significant attention due to their promising applications, especially in ice prevention, reduction in air resistance, and self-cleaning. This study utilizes femtosecond laser processing technology to prepare different surface microstructures on polytetrafluoroethylene (PTFE) surfaces. Through experiments, it investigates the relationship between the solid-liquid contact ratio and surface hydrophobicity. The shape of water droplets on different microstructure surfaces is simulated using ANSYS, and the relationship between surface microstructures and hydrophobicity is explored in the theoretical model. A superhydrophobic surface with a contact angle of up to 166° was obtained by machining grooves with different spacings in polytetrafluoroethylene sheets with femtosecond laser technology. Due to the micro- and nanostructures on the surface, the oleophobicity of the processed oleophilic PTFE surface is enhanced.
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Affiliation(s)
- Shuangquan Zhou
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; (S.Z.); (Y.H.); (Y.H.); (H.X.); (D.W.)
| | - Yayue Hu
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; (S.Z.); (Y.H.); (Y.H.); (H.X.); (D.W.)
| | - Yao Huang
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; (S.Z.); (Y.H.); (Y.H.); (H.X.); (D.W.)
| | - Hong Xu
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; (S.Z.); (Y.H.); (Y.H.); (H.X.); (D.W.)
| | - Daming Wu
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; (S.Z.); (Y.H.); (Y.H.); (H.X.); (D.W.)
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
| | - Dong Wu
- College of Engineering Science, University of Science and Technology of China, Hefei 230027, China
| | - Xiaolong Gao
- College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029, China; (S.Z.); (Y.H.); (Y.H.); (H.X.); (D.W.)
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Nie HP, Wu Q, Wu J, Cai KZ, Shen Y, Tang CB. Bioinspired Synthesis of Ag Nanoparticles onto Polytetrafluoroethylene with Enhanced Antibacterial Activity for Dental Implant Application. Discov Med 2023; 35:1104-1113. [PMID: 38058076 DOI: 10.24976/discov.med.202335179.107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
BACKGROUND Endosseous implants are widely used as a treatment for tooth loss, but gaps in the implant-abutment interface, and the cavity inside the implant, can cause inflammation of the tissue surrounding the implant. Currently available filling materials, however, cannot solve these problems. Therefore, the development of new antibacterial materials is key. In this study, we synthesized Ag nanoparticle-coated polytetrafluoroethylene (PTFE), analyzed the effect of Ag ion concentration, and estimated the antibacterial effects against oral pathogens in vitro. Method: The Ag nanoparticles (AgNPs)-modified PTFE was achieved using self-polymerized dopamine in an alkaline solution (2 mg/mL) and reduction reaction of Ag ions (0.01 mol/L and 0.05 mol/L). The surface features, chemical components, and wettability were characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and contact angle measurement. The antibacterial effect against Streptococcus mutans and Porphyromonas gingivalis was evaluated by counting colony-forming units on agar media and the visualization of bacteria present on the specimens by SEM and confocal laser scanning microscope (CLSM). RESULTS The surface characterization results indicated that a polydopamine film was successfully formed on the PTFE membrane, and spherical AgNPs were successfully reduced. With increasing concentration of the Ag precursor, the contents of the AgNPs increased (p < 0.05). The antibacterial ratio of AgNP-coated PTFE against Streptococcus mutans and Porphyromonas gingivalis reached 94.2% and 80.6%, respectively. The results of antibacterial testing analyzed via SEM and CLSM also demonstrated the robust antibacterial ability of AgNPs-modified PTFE (p < 0.05). CONCLUSIONS AgNPs-modified PTFE has great potential to function as an implant filling material with enhanced antibacterial properties, and has the potential to be a novel antimicrobial material for the prevention of peri-implantitis in the clinic.
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Affiliation(s)
- He-Peng Nie
- Department of Dental Implantology, The Affiliated Stomatological Hospital of Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, 210029 Nanjing, Jiangsu, China
| | - Qiong Wu
- Department of Dental Implantology, The Affiliated Stomatological Hospital of Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, 210029 Nanjing, Jiangsu, China
| | - Jin Wu
- Department of Dental Implantology, The Affiliated Stomatological Hospital of Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, 210029 Nanjing, Jiangsu, China
| | - Kun-Zhan Cai
- Department of Dental Implantology, The Affiliated Stomatological Hospital of Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, 210029 Nanjing, Jiangsu, China
| | - Yue Shen
- Department of Dental Implantology, The Affiliated Stomatological Hospital of Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, 210029 Nanjing, Jiangsu, China
| | - Chun-Bo Tang
- Department of Dental Implantology, The Affiliated Stomatological Hospital of Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Key Laboratory of Oral Diseases, Nanjing Medical University, 210029 Nanjing, Jiangsu, China
- Jiangsu Province Engineering Research Center of Stomatological Translational Medicine, 210029 Nanjing, Jiangsu, China
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Xiao Z, Rotmans JI, Letachowicz K, Franchin M, D'Oria M. Outcomes of early cannulation arteriovenous graft versus PTFE arteriovenous graft in hemodialysis patients: A meta-analysis and systematic review. J Vasc Access 2023:11297298231205325. [PMID: 37936395 DOI: 10.1177/11297298231205325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023] Open
Abstract
Arteriovenous graft (AVG) is an alternative for hemodialysis (HD) patients with end-stage renal disease when their permanent vascular accesses fail. Since the last decades, the most widely used materials in these patients have been polytetrafluoroethylene (PTFE)-AVGs. Recently, several studies have reported that early cannulation (EC)-AVG can be an alternative to PTFE-AVG. This systematic review and meta-analysis aimed to compare the outcomes of EC-AVG and PTFE-AVG in HD patients. We searched the Ovid Embase, Ovid MEDLINE, and Cochrane Central Register of Controlled Trials for the relevant studies published from 01.01.2000 to 19.12.2022 by keywords and free words. All randomized controlled trials (RCTs) and observational cohort studies comparing EC-AVG with PTFE-AVG were included. Ten studies were included in analysis: one RCT, six retrospective cohort studies, and three prospective cohort studies. The results showed shorter cannulation intervals (four studies, 1116 participants: mean difference -23.62 days, 95% CI [-32.03, -15.21], p < 0.05) and less central venous catheter (CVC) usage (four studies, 733 participants: OR 0.20, 95% CI [0.04, 0.92], p < 0.05) for EC-AVG compared with PTFE-AVG, while comparable outcomes of primary patency (eight studies, 1712 participants: HR 0.89, 95% CI [0.70, 1.12]), primary assisted patency (five studies, 1355 participants: HR 1.13, 95% CI [0.70, 1.84]), secondary patency (nine studies, 1920 participants: HR 0.93, 95% CI [0.66, 1.31]), and infection risk (four studies, 640 participants: HR 1.12, 95% CI [0.48, 2.58]). When compared to PTFE-AVG in HD patients, EC-AVG seems to exhibit shorter cannulation intervals, less CVC usage, and comparable outcomes of graft patency, and infection risk.
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Affiliation(s)
- Zhuotao Xiao
- Department of Internal Medicine, Leiden University Medical Center, Leiden, The Netherlands
- Department of Nephrology, the First Affiliated Hospital of Soochow University, Suzhou, China
| | - Joris I Rotmans
- Department of Internal Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Krzysztof Letachowicz
- Department of Nephrology and Transplantation Medicine, Wroclaw Medical University, Wroclaw, Poland
| | - Marco Franchin
- Vascular Surgery Unit, Circolo University Teaching Hospital, ASST Settelaghi, Varese, Italy
| | - Mario D'Oria
- Division of Vascular and Endovascular Surgery, Department of Medical Surgical and Health Sciences, University of Trieste, Trieste, Italy
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Nakai M, Saguchi T, Yunaiyama D, Takara Y, Tanaka T, Okada Y, Saito K. Development and Experimental Study of a Polytetrafluoroethylene-Tipped Microcatheter Poorly Adhesive to n-Butyl-2-Cyanoacrylate. J Endovasc Ther 2023:15266028231208652. [PMID: 37906469 DOI: 10.1177/15266028231208652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
PURPOSE We have developed a new microcatheter (designated "NSX") with an outer layer of polytetrafluoroethylene (PTFE) at its tip. We compared the adhesion of the new NSX microcatheter and a conventional microcatheter with n-butyl-2-cyanoacrylate (NBCA) in vitro and in swine blood vessels. MATERIALS AND METHODS The 3 cm tip of the NSX microcatheter is composed of PTFE, which can be identified by double platinum markers. The tips of the NSX and conventional microcatheters were inserted into a vascular model filled with porcine blood with no flow, and NBCA mixed with lipiodol (1:2) was injected from the microcatheters. Two minutes after the injection of NBCA, the microcatheter was withdrawn and the degree of its adhesion to NBCA was evaluated by measuring the resistance value (N) during catheter removal with a digital force gauge. These measurements were repeated with 20 catheters of each type. Similarly, 5 injections were performed with both the NSX and conventional microcatheters in swine vessels. The degree of adhesion of the catheter and blood vessel was evaluated by 2 radiologists under X-ray fluoroscopy on a 3-point scale: 1, no adhesion; 2, mild adhesion; 3, strong adhesion. RESULTS The mean resistance values (N) for the NSX and conventional microcatheters were 0.503±0.186 and 1.051±0.367 (N), respectively (p<0.001). The NSX adhered negligibly to the NBCA and was easily removed, whereas the conventional microcatheter adhered strongly to the NBCA in the blood vessels and was difficult to remove from the swine vessels (p=0.008). CONCLUSIONS The new NSX microcatheter with a PTFE tip exhibits poorer adhesion to NBCA than do conventional microcatheters and allows for safer injection of NBCA than conventional microcatheters, without requiring immediate catheter retrieval. CLINICAL IMPACT The NSX microcatheter with a PTFE tip adheres less strongly to NBCA than do conventional microcatheters and allows the safe injection of NBCA. The NSX microcatheter has double platinum markers on its tip, which make it easy to distinguish the PTFE-covered region. As the NSX does not adhere firmly to the arterial wall, it is less likely to cause vascular injury during removal of the catheter compared with conventional microcatheters, so there is no need to remove the NSX immediately after injecting NBCA. Even operators unfamiliar with NBCA can use NBCA safely with this new NSX microcatheter without requiring special training or skill.
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Affiliation(s)
- Motoki Nakai
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | - Toru Saguchi
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | | | - Yuki Takara
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | - Taro Tanaka
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | - Yukinori Okada
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
| | - Kazuhiro Saito
- Department of Radiology, Tokyo Medical University, Tokyo, Japan
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Xu Q, Tang X, Zhang J, Hu Y, Ma T. Unraveling Tribochemistry and Self-Lubrication Mechanism of Polytetrafluoroethylene by Reactive Coarse-Grained Molecular Dynamics Simulations. ACS Appl Mater Interfaces 2023; 15:45506-45515. [PMID: 37703837 DOI: 10.1021/acsami.3c10784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/15/2023]
Abstract
Lubrication of polymeric materials generally involves processes of atomic-scale chemical bond forming/breaking at the interface and mesoscale chain reorientation, disentanglement, and so forth. However, it is difficult to describe the important aspects of tribochemical reactions by conventional coarse-grained molecular dynamics (CGMD) simulations. Here, reactive CGMD simulations were conducted based on the ReaxFF force field to study the tribochemical interactions between polytetrafluoroethylene (PTFE) and iron. The chemical bond forming/breaking between the molecular chain and countersurface was fitted through the bond dissociation energies of specific reaction sites from all-atom ReaxFF-MD simulations. This enabled a quantitative description of tribochemical reactions in a macromolecule system. First, the number of anchoring bonds between PTFE molecules and the countersurface showed a strong correlation with the friction coefficient. The shearing process induced breaking of the interfacial anchoring bonds as well as chain disentanglement in the matrix, which consequently led to ordering reorientation of molecular chains toward sliding direction and hence decrease of friction. Second, two competitive factors were clarified to affect polymer friction with varying temperatures. The decrease of interfacial anchoring reactivity and molecular chain mobility at low temperature prohibited reorientation of molecular chains and increased the friction coefficient. On the other hand, the hardening of PTFE and the reduction in effective contact area at low temperatures decreased the friction coefficient. This led to a turning point with a maximum friction coefficient around 100 K. These results shed light on the essential role of tribochemical reactions on polymer lubrication, especially under low temperatures, which provides design guidance of polymeric lubrication systems for engineering applications.
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Affiliation(s)
- Qiang Xu
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
- Computational Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, Sichuan, China
| | - Xin Tang
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
| | - Jie Zhang
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
- School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Yuanzhong Hu
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
| | - Tianbao Ma
- State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China
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11
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McKiel LA, Ballantyne LL, Negri GL, Woodhouse KA, Fitzpatrick LE. MyD88-dependent Toll-like receptor 2 signaling modulates macrophage activation on lysate-adsorbed Teflon™ AF surfaces in an in vitro biomaterial host response model. Front Immunol 2023; 14:1232586. [PMID: 37691934 PMCID: PMC10491479 DOI: 10.3389/fimmu.2023.1232586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 08/02/2023] [Indexed: 09/12/2023] Open
Abstract
The adsorbed protein layer on an implanted biomaterial surface is known to mediate downstream cell-material interactions that drive the host response. While the adsorption of plasma-derived proteins has been studied extensively, the adsorption of damage-associated molecular patterns (DAMPs) derived from damaged cells and matrix surrounding the implant remains poorly understood. Previously, our group developed a DAMP-adsorption model in which 3T3 fibroblast lysates were used as a complex source of cell-derived DAMPs and we demonstrated that biomaterials with adsorbed lysate potently activated RAW-Blue macrophages via Toll-like receptor 2 (TLR2). In the present study, we characterized the response of mouse bone marrow derived macrophages (BMDM) from wildtype (WT), TLR2-/- and MyD88-/- mice on Teflon™ AF surfaces pre-adsorbed with 10% plasma or lysate-spiked plasma (10% w/w total protein from 3T3 fibroblast lysate) for 24 hours. WT BMDM cultured on adsorbates derived from 10% lysate in plasma had significantly higher gene and protein expression of IL-1β, IL-6, TNF-α, IL-10, RANTES/CCL5 and CXCL1/KC, compared to 10% plasma-adsorbed surfaces. Furthermore, the upregulation of pro-inflammatory cytokine and chemokine expression in the 10% lysate in plasma condition was attenuated in TLR2-/- and MyD88-/- BMDM. Proteomic analysis of the adsorbed protein layers showed that even this relatively small addition of lysate-derived proteins within plasma (10% w/w) caused a significant change to the adsorbed protein profile. The 10% plasma condition had fibrinogen, albumin, apolipoproteins, complement, and fibronectin among the top 25 most abundant proteins. While proteins layers generated from 10% lysate in plasma retained fibrinogen and fibronectin among the top 25 proteins, there was a disproportionate increase in intracellular proteins, including histones, tubulins, actins, and vimentin. Furthermore, we identified 7 DAMPs or DAMP-related proteins enriched in the 10% plasma condition (fibrinogen, apolipoproteins), compared to 39 DAMPs enriched in the 10% lysate in plasma condition, including high mobility group box 1 and histones. Together, these findings indicate that DAMPs and other intracellular proteins readily adsorb to biomaterial surfaces in competition with plasma proteins, and that adsorbed DAMPs induce an inflammatory response in adherent macrophages that is mediated by the MyD88-dependent TLR2 signaling pathway.
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Affiliation(s)
- Laura A. McKiel
- Department of Chemical Engineering, Faculty of Engineering and Applied Sciences, Queen’s University, Kingston, ON, Canada
| | - Laurel L. Ballantyne
- Department of Chemical Engineering, Faculty of Engineering and Applied Sciences, Queen’s University, Kingston, ON, Canada
- Centre for Health Innovation, Queen’s University and Kingston Health Sciences, Kingston, ON, Canada
| | | | - Kimberly A. Woodhouse
- Department of Chemical Engineering, Faculty of Engineering and Applied Sciences, Queen’s University, Kingston, ON, Canada
| | - Lindsay E. Fitzpatrick
- Department of Chemical Engineering, Faculty of Engineering and Applied Sciences, Queen’s University, Kingston, ON, Canada
- Centre for Health Innovation, Queen’s University and Kingston Health Sciences, Kingston, ON, Canada
- Department of Biomedical and Molecular Sciences, Faculty of Health Sciences, Queen’s University, Kingston, ON, Canada
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12
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Topcu FS, Simsek B, Ozyuksel A. An unusual case of pulmonary atresia with ventricular septal defect and multiple major aortopulmonary collateral arteries: undiagnosed until adulthood. Cardiol Young 2023; 33:1445-1447. [PMID: 36621769 DOI: 10.1017/s1047951122004127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Pulmonary atresia and ventricular septal defect with major aortopulmonary collateral arteries is an extremely complex, heterogeneous, and rare anomaly. This group of patients may not be able to survive until adulthood without any interventions or treatment. Although surgical management of patients diagnosed in newborn, infant, or early childhood is clear, treatment of patients diagnosed in adulthood still remains a significant problem. The pre-operative clinical status, imaging methods, and operative findings might be helpful for planning the most appropriate management. Herein, we report a unique case of pulmonary atresia and ventricular septal defect with major aortopulmonary collateral arteries who remained asymptomatic until the age of 18 years.
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Affiliation(s)
- Feyza Sönmez Topcu
- Department of Radiology, Aydin University, Medical Park Florya Hospital, Istanbul, Turkey
| | - Baran Simsek
- Department of Cardiovascular Surgery, Medicana International Hospital, Istanbul, Turkey
| | - Arda Ozyuksel
- Department of Cardiovascular Surgery, Medicana International Hospital, Istanbul, Turkey
- Department of Cardiovascular Surgery, Biruni University, Istanbul, Turkey
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13
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Egidy Assenza G, Cheatham JP, Stefanescu Schmidt AC. Long Arc of Covered Stent Use in Coarctation of the Aorta in the United States. Circ Cardiovasc Interv 2023:e013278. [PMID: 37417232 DOI: 10.1161/circinterventions.123.013278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Affiliation(s)
- Gabriele Egidy Assenza
- Adult Congenital Heart Program, Department of Cardio-Thoracic and Vascular Medicine, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Italy (G.E.A.)
| | - John P Cheatham
- Divisions of Pediatrics and Cardiology, The Ohio State University, Columbus (J.P.C.)
| | - Ada C Stefanescu Schmidt
- Adult Congenital and Interventional Cardiology, Heart Center, Massachusetts General Hospital and Harvard Medical School, Boston (A.C.S.S.)
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14
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Ngo QP, Yuan W, Wu YCM, Swager TM. Emulsion Assembly of Graphene Oxide/Polymer Composite Membranes. ACS Appl Mater Interfaces 2023; 15:21384-21393. [PMID: 37071537 DOI: 10.1021/acsami.3c02636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Graphene oxide/polymer composite water filtration membranes were developed via coalescence of graphene oxide (GO) stabilized Pickering emulsions around a porosity-generating polymer. Triptycene poly(ether ether sulfone)-CH2NH2:HCl polymer interacts with the GO at the water-oil interface, resulting in stable Pickering emulsions. When they are deposited and dried on polytetrafluoroethylene substrate, the emulsions fuse to form a continuous GO/polymer composite membrane. X-ray diffraction and scanning electron microscopy demonstrate that the intersheet spacing and thickness of the membranes increased with increasing polymer concentration, confirming the polymer as the spacer between the GO sheets. The water filtration capability of the composite membranes was tested by removing Rose Bengal from water, mimicking separations of weak black liquor waste. The composite membrane achieved 65% rejection and 2500 g m-2 h-1 bar-1. With high polymer and GO loading, composite membranes give superior rejection and permeance performance when compared with a GO membrane. This methodology for fabrication membranes via GO/polymer Pickering emulsions produces membranes with a homogeneous morphology and robust chemical separation strength.
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Affiliation(s)
- Quynh P Ngo
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Weize Yuan
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - You-Chi Mason Wu
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Timothy M Swager
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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Heindel P, Feliz JD, Fitzgibbon JJ, Rouanet E, Belkin M, Hentschel DM, Ozaki CK, Hussain MA. Comparative effectiveness of bovine carotid artery xenograft and polytetrafluoroethylene in hemodialysis access revision. J Vasc Access 2023:11297298231170654. [PMID: 37125779 DOI: 10.1177/11297298231170654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2023] Open
Abstract
BACKGROUND When hemodialysis arteriovenous accesses fail, autogenous options are often limited. Non-autogenous conduit choices include bovine carotid artery xenografts (BCAG) and expanded polytetrafluoroethylene (PTFE), yet their comparative effectiveness in hemodialysis access revision remains largely unknown. METHODS A cohort study was performed from a prospectively collected institutional database from August 2010 to July 2021. All patients undergoing an arteriovenous access revision with either BCAG or PTFE were followed for up to 3 years from their index access revision. Revision was defined as graft placement to address a specific problem of an existing arteriovenous access while maintaining one or more of the key components of the original access (e.g. inflow, outflow, and cannulation zone). Outcomes were measured starting at the date of the index revision procedure. The primary outcome was loss of secondary patency at 3 years. Secondary outcomes included loss of post-intervention primary patency, rates of recurrent interventions, and 30-day complications. Pooled logistic regression was used to estimate inverse probability weighted marginal structural models for the time-to-event outcomes of interest. RESULTS A total of 159 patients were included in the study, and 58% received access revision with BCAG. Common indications for revision included worn out cannulation zones (32%), thrombosis (18%), outflow augmentation (16%), and inflow augmentation (13%). Estimated risk of secondary patency loss at 3 years was lower in the BCAG group (8.6%, 3.9-15.1) compared to the PTFE group (24.8%, 12.4-38.7). Patients receiving BCAG experienced a 60% decreased relative risk of secondary patency loss at 3 years (risk ratio 0.40, 0.14-0.86). Recurrent interventions occurred at similar rates in the BCAG and PTFE groups, with 1.86 (1.31-2.43) and 1.60 (1.07-2.14) interventions at 1 year, respectively (hazard ratio 1.22, 0.74-1.96). CONCLUSIONS Under the conditions of this contemporary cohort study, use of BCAG in upper extremity hemodialysis access revision decreased access abandonment when compared to PTFE.
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Affiliation(s)
- Patrick Heindel
- Department of Surgery, Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
- Center for Surgery and Public Health, Department of Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
| | - Jessica D Feliz
- Department of Surgery, Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
- Center for Surgery and Public Health, Department of Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
| | - James J Fitzgibbon
- Department of Surgery, Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
- Center for Surgery and Public Health, Department of Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
| | - Eva Rouanet
- Department of Surgery, Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
- Center for Surgery and Public Health, Department of Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
| | - Michael Belkin
- Department of Surgery, Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
| | - Dirk M Hentschel
- Department of Medicine, Division of Renal Medicine, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
| | - C Keith Ozaki
- Department of Surgery, Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
| | - Mohamad A Hussain
- Department of Surgery, Division of Vascular and Endovascular Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
- Center for Surgery and Public Health, Department of Surgery, Brigham and Women's Hospital/Harvard Medical School, Boston, MA, USA
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16
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Lee D, Manthiram A. Stable Cycling with Intimate Contacts Enabled by Crystallinity-Controlled PTFE-Based Solvent-Free Cathodes in All-Solid-State Batteries. Small Methods 2023:e2201680. [PMID: 37096885 DOI: 10.1002/smtd.202201680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2022] [Revised: 03/15/2023] [Indexed: 05/03/2023]
Abstract
All-solid-state batteries (ASSBs) employing Li-metal anodes and inorganic solid electrolytes are attracting great attention due to high safety and energy density for next-generation energy storage devices. However, the volume change of cathode active materials can cause contact loss, resulting in charge carrier isolation, heterogeneous current distribution, and poor electrochemical properties in ASSBs. Here, a simple, yet effective, solvent-free electrode engineering approach with polytetrafluoroethylene (PTFE) as a binder for ASSBs is reported, enabling intimate contact and stable interfaces with the cathode. It is substantiated that the crystallinity of PTFE can be controlled depending on the heat history, and highly crystalline PTFE displays robust mechanical properties. High-nickel LiNi0 . 8 Mn0.1 Co0.1 O2 cathode prepared with crystalline PTFE show improved cycle and rate performances in ASSBs. In addition, it is revealed that the intimate contact between cathode particles with a stable cathode electrolyte layer is maintained during cycling by postmortem studies. This simple engineering method can be applied to prepare cathodes with a variety of active materials and solid electrolytes in ASSBs.
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Affiliation(s)
- Dongsoo Lee
- Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712-1591, USA
| | - Arumugam Manthiram
- Materials Science and Engineering Program & Texas Materials Institute, The University of Texas at Austin, Austin, TX, 78712-1591, USA
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17
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Liang X, Wu P, Lan L, Wang Y, Ning Y, Wang Y, Qin Y. Effect of Polytetrafluoroethylene (PTFE) Content on the Properties of Ni-Cu-P-PTFE Composite Coatings. Materials (Basel) 2023; 16:1966. [PMID: 36903081 PMCID: PMC10004372 DOI: 10.3390/ma16051966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 02/13/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Q235B mild steel has the advantages of good mechanical properties, welding properties, and low cost, and it is widely used in bridges, energy fields, and marine equipment. However, Q235B low-carbon steel is prone to serious pitting corrosion in urban water and sea water with high chloride ions (Cl-), which restricts its application and development. Herein, to explore the effects of different concentrations of polytetrafluoroethylene (PTFE) on the physical phase composition, the properties of Ni-Cu-P-PTFE composite coatings were studied. The Ni-Cu-P-PTFE composite coatings with PTFE concentrations of 10 mL/L, 15 mL/L, and 20 mL/L were prepared on the surface of Q235B mild steel by the chemical composite plating method. The surface morphology, elemental content distribution, phase composition, surface roughness, Vickers hardness, corrosion current density, and corrosion potential of the composite coatings were analyzed by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), three-dimensional profile, Vickers hardness, electrochemical impedance spectroscopy (EIS), and Tafel curve test methods. The electrochemical corrosion results showed that the corrosion current density of the composite coating with a PTFE concentration of 10 mL/L in 3.5 wt% NaCl solution was 7.255 × 10-6 A∙cm-2, and the corrosion voltage was -0.314 V. The corrosion current density of the 10 mL/L composite plating was the lowest, the corrosion voltage positive shift was the highest, and the EIS arc diameter of the 10 mL/L composite plating was also the largest, which indicated that the 10 mL/L composite plating had the best corrosion resistance. Ni-Cu-P-PTFE composite coating significantly enhanced the corrosion resistance of Q235B mild steel in 3.5 wt% NaCl solution. This work provides a feasible strategy for an anti-corrosion design of Q235B mild steel.
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Affiliation(s)
- Xinghua Liang
- Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, China
| | - Penggui Wu
- Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, China
| | - Lingxiao Lan
- Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, China
| | - Yujiang Wang
- Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, China
| | - Yujuan Ning
- Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, China
| | - Yu Wang
- Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China
| | - Yunmei Qin
- Guangxi Key Laboratory of Automobile Components and Vehicle Technology, Guangxi University of Science and Technology, Liuzhou 545006, China
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Moskvitin LV, Koshkina OA, Slesarenko SV, Arsentyev MA, Trakhtenberg LI, Ryndya SM, Magomedbekov EP, Smolyanskii AS. Thermoradiationally Modified Polytetrafluoroethylene as a Basis for Membrane Fabrication: Resistance to Hydrogen Penetration, the Effect of Ion Treatment on the Chemical Structure and Surface Morphology, Evaluation of the Track Radius. Membranes (Basel) 2023; 13:101. [PMID: 36676908 PMCID: PMC9866713 DOI: 10.3390/membranes13010101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 12/21/2022] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
A study of the properties of thermoradiationally modified polytetrafluoroethylene and its importance for use as the basis of polymer membranes is presented. The hydrogen permeability of a TRM-PTFE film was studied in comparison with an original PTFE film, and showed a three-fold decrease in hydrogen permeability. Further, TRM-PTFE films were irradiated with accelerated Xe ions with an energy of 1 MeV with fluences from 1 × 108 to 1 × 1011. The changes induced by ion treatment were analyzed by infrared spectroscopy of disturbed total internal reflection (IR-ATR) and by atomic force microscopy (ASM). IR-ATR indicated the absence of destruction in the fluence range from 1 × 108 to 3 × 1010 cm-2 (in the area of isolated tracks) and the beginning of overlap of latent tracks on fluences from 3 × 1010 to 1 × 1011 cm-2. Topographic images with AFM showed layered lamellar structures that collapsed at a fluence of 108 cm-2. The destruction was accompanied by a decrease in roughness about seven times the size of the track core observed by the ASM method, fully corresponding to the value obtained on the basis of calculations using modeling in an SRIM program.
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Affiliation(s)
- Lev Vladimirovich Moskvitin
- High Energy Chemistry and Radioecology Department, D. Mendeleev University of Chemical Technology of Russia, Moscow 125047, Russia
- Technology Department, Quantum R LLC, Moscow 125319, Russia
| | - Ol’ga Alekseevna Koshkina
- Laboratory of Functional Nanocomposites, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Science, Moscow 119991, Russia
| | | | | | - Leonid Izrailevich Trakhtenberg
- Laboratory of Functional Nanocomposites, N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Science, Moscow 119991, Russia
- Laboratory of Chemical Kinetics, Chemical Department, Lomonosov Moscow State University, Moscow 119991, Russia
- Department of Chemical Physics, Moscow Institute of Physics and Technology (State University), Dolgoprudny 141700, Russia
| | - Sergei Mikhailovich Ryndya
- Laboratory of Integrated Technology of Semiconductor Devices of the Center for Radio Photonics and Microwave Technologies of the Institute of Nanotechnologies in Electronics, Spintronics and Photonics of National Research Nuclear University MEPhI, Moscow 115409, Russia
| | - Eldar Parpachevich Magomedbekov
- High Energy Chemistry and Radioecology Department, D. Mendeleev University of Chemical Technology of Russia, Moscow 125047, Russia
| | - Alexander Sergeevich Smolyanskii
- High Energy Chemistry and Radioecology Department, D. Mendeleev University of Chemical Technology of Russia, Moscow 125047, Russia
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Russu E, Mureșan AV, Ivănescu AD, Kaller R, Nedelea DE, Niculescu R, Cordoș BA, Budișcă OA, Arbănași EM, Arbănași EM. Polytetrafluorethylene (PTFE) vs. Polyester (Dacron ®) Grafts in Critical Limb Ischemia Salvage. Int J Environ Res Public Health 2023; 20:1235. [PMID: 36673997 PMCID: PMC9859081 DOI: 10.3390/ijerph20021235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 12/31/2022] [Accepted: 01/07/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Critical ischemia of the lower limbs refers to the last stages of peripheral arterial disease. It is characterized by resting discomfort or trophic disorders such as ulceration, skin necrosis, or gangrene in the lower limbs. Critical ischemia corresponds to Leriche-Fontaine (LF) stages III-IV and Rutherford stages 4-6. The purpose of this study was to observe the patency and postoperative complications of patients who have had infra-inguinal surgical revascularization and compare the results based on the kind of graft utilized. METHODS The present study was designed as an observational retrospective cohort study, including all patients from 2018 to 2019 diagnosed with severe ischemia of the lower limbs who were hospitalized at the Vascular Surgery Clinic of the County Emergency Clinical Hospital of Targu Mures. RESULTS Patients with a polytetrafluoroethylene (PTFE) graft had a higher incidence of chronic obstructive pulmonary disease (p = 0.01), stage III LF (70.41% vs. 55.29%), p = 0.03), and a lower incidence of stage IV LF (29.95% vs. 44.71%, p = 0.03). As for complications, the PTFE group showed a lower incidence of bypass thrombosis (29.59% vs. 44.71%; p = 0.03) and graft infection (9.18% vs. 21.18%; p = 0.02), but no statistical significance in the event of bleeding (p = 0.40). Regarding the outcomes, no statistical significance was seen for below-the-knee amputations or death. However, the PTFE group had a lower incidence of above-the-knee amputations (11.22% vs. 24.71%; p = 0.01). At multivariate analysis, the PTFE graft is an independent predictor of primary patency at 6, 12, and 24 months (OR: 2.15, p = 0.02; OR: 1.84, p = 0.04; and OR: 1.89, p = 0.03), as well as a protective factor against bypass thrombosis (OR: 0.52; p = 0.03), graft infection (OR: 0.37; p = 0.02), and above-the-knee amputation (OR: 0.38; p = 0.01).; Conclusions: According to this study's findings, there were minor differences regarding the long-term patency, bypass thrombosis, graft infections, and above-the-knee amputations. In addition, the PTFE graft group had a higher incidence of primary patency at 6, 12, and 24 months, as well as a lower incidence of bypass thrombosis, graft infection, and above-the-knee amputations.
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Affiliation(s)
- Eliza Russu
- Clinic of Vascular Surgery, Mureș County Emergency Hospital, 540136 Targu Mures, Romania
- Department of Vascular Surgery, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
| | - Adrian Vasile Mureșan
- Clinic of Vascular Surgery, Mureș County Emergency Hospital, 540136 Targu Mures, Romania
- Department of Vascular Surgery, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
| | - Adrian Dumitru Ivănescu
- Department of Anatomy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
| | - Réka Kaller
- Clinic of Vascular Surgery, Mureș County Emergency Hospital, 540136 Targu Mures, Romania
- Department of Vascular Surgery, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
- Doctoral School of Medicine and Pharmacy, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, 540142 Targu Mures, Romania
| | - Daniela Elena Nedelea
- Clinic of Vascular Surgery, Mureș County Emergency Hospital, 540136 Targu Mures, Romania
| | - Raluca Niculescu
- Department of Pathophysiology, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
| | - Bogdan Andrei Cordoș
- Center for Advanced Medical and Pharmaceutical Research, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, 540139 Targu Mures, Romania
- Veterinary Experimental Base, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
| | - Ovidiu Aurelian Budișcă
- Department of Surgery, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
| | - Eliza Mihaela Arbănași
- Faculty of Pharmacy, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
| | - Emil Marian Arbănași
- Clinic of Vascular Surgery, Mureș County Emergency Hospital, 540136 Targu Mures, Romania
- Department of Vascular Surgery, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
- Doctoral School of Medicine and Pharmacy, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, 540142 Targu Mures, Romania
- Center for Advanced Medical and Pharmaceutical Research, George Emil Palade University of Medicine, Pharmacy, Sciences and Technology of Targu Mures, 540139 Targu Mures, Romania
- Veterinary Experimental Base, George Emil Palade University of Medicine, Pharmacy, Science, and Technology of Targu Mures, 540139 Targu Mures, Romania
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Vasilev AP, Lazareva NN, Struchkova TS, Okhlopkova AA, Danilova SN. Mechanical and Tribological Properties of Polytetrafluoroethylene Modified with Combined Fillers: Carbon Fibers, Zirconium Dioxide, Silicon Dioxide and Boron Nitride. Polymers (Basel) 2023; 15:polym15020313. [PMID: 36679195 PMCID: PMC9862799 DOI: 10.3390/polym15020313] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 01/04/2023] [Accepted: 01/05/2023] [Indexed: 01/11/2023] Open
Abstract
The introduction of combined fillers can effectively improve the mechanical and tribological properties of polytetrafluoroethylene (PTFE). In this work, three different types of nanosized fillers (zirconium dioxide, silicon dioxide, and boron nitride) were introduced in a carbon fiber-reinforced polymer matrix for the development of polymer composite materials (PCM). Tensile and compressive testing were carried out, and the hardness of created PCM was evaluated. It is shown that the compressive strength of PCM increased by 30-70%, and the hardness, increased by 38-55% compared to the initial PTFE. The tribological properties of the developed PCM were evaluated under dry friction conditions. An analysis of the results of an experimental study of wear confirmed that the inclusion of combined fillers (two- and three-component) in PTFE significantly increased wear resistance compared to the polymer matrix with a slight increase in the coefficient of friction. It has been shown that the introduction of three-component fillers has an antagonistic effect on the wear resistance of PCMs compared to two-component fillers. The thermodynamic properties of the composites were analyzed by differential scanning calorimetry and a thermomechanical analyzer. The surface morphology of polymer composites after wear testing was studied by IR spectroscopy and scanning electron microscopy to investigate and suggest a possible mechanism for increasing the wear resistance of the developed composites.
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21
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Gudkov SV, Li R, Serov DA, Burmistrov DE, Baimler IV, Baryshev AS, Simakin AV, Uvarov OV, Astashev ME, Nefedova NB, Smolentsev SY, Onegov AV, Sevostyanov MA, Kolmakov AG, Kaplan MA, Drozdov A, Tolordava ER, Semenova AA, Lisitsyn AB, Lednev VN. Fluoroplast Doped by Ag 2O Nanoparticles as New Repairing Non-Cytotoxic Antibacterial Coating for Meat Industry. Int J Mol Sci 2023; 24:ijms24010869. [PMID: 36614309 PMCID: PMC9821803 DOI: 10.3390/ijms24010869] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 12/20/2022] [Accepted: 12/28/2022] [Indexed: 01/05/2023] Open
Abstract
Foodborne infections are an important global health problem due to their high prevalence and potential for severe complications. Bacterial contamination of meat during processing at the enterprise can be a source of foodborne infections. Polymeric coatings with antibacterial properties can be applied to prevent bacterial contamination. A composite coating based on fluoroplast and Ag2O NPs can serve as such a coating. In present study, we, for the first time, created a composite coating based on fluoroplast and Ag2O NPs. Using laser ablation in water, we obtained spherical Ag2O NPs with an average size of 45 nm and a ζ-potential of -32 mV. The resulting Ag2O NPs at concentrations of 0.001-0.1% were transferred into acetone and mixed with a fluoroplast-based varnish. The developed coating made it possible to completely eliminate damage to a Teflon cutting board. The fluoroplast/Ag2O NP coating was free of defects and inhomogeneities at the nano level. The fluoroplast/Ag2O NP composite increased the production of ROS (H2O2, OH radical), 8-oxogualnine in DNA in vitro, and long-lived active forms of proteins. The effect depended on the mass fraction of the added Ag2O NPs. The 0.01-0.1% fluoroplast/NP Ag2O coating exhibited excellent bacteriostatic and bactericidal properties against both Gram-positive and Gram-negative bacteria but did not affect the viability of eukaryotic cells. The developed PTFE/NP Ag2O 0.01-0.1% coating can be used to protect cutting boards from bacterial contamination in the meat processing industry.
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Affiliation(s)
- Sergey V. Gudkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
- All-Russia Research Institute of Phytopathology of the Russian Academy of Sciences, Institute St., 5, Big Vyazyomy, 143050 Moscow, Russia
- Institute of Biology and Biomedicine, Lobachevsky State University of Nizhny Novgorod, 603105 Nizhny Novgorod, Russia
| | - Ruibin Li
- School for Radiologic and Interdisciplinary Science, Soochow University, Suzhou 215123, China
| | - Dmitriy A. Serov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
- Institute of Cell Biophysics, Russian Academy of Sciences, Federal Research Center Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Institutskaya St., 3, 142290 Pushchino, Russia
| | - Dmitriy E. Burmistrov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Ilya V. Baimler
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Alexey S. Baryshev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Alexander V. Simakin
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Oleg V. Uvarov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
| | - Maxim E. Astashev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
- Institute of Cell Biophysics, Russian Academy of Sciences, Federal Research Center Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Institutskaya St., 3, 142290 Pushchino, Russia
| | - Natalia B. Nefedova
- Institute of Cell Biophysics, Russian Academy of Sciences, Federal Research Center Pushchino Scientific Center for Biological Research of the Russian Academy of Sciences, Institutskaya St., 3, 142290 Pushchino, Russia
- Federal State Budget Educational Institution of Higher Education Pushchino State Institute of Natural Science, Science Av. 3, 142290 Pushchino, Russia
| | | | - Andrey V. Onegov
- Mari State University, pl. Lenina, 1, 424001 Yoshkar-Ola, Russia
| | - Mikhail A. Sevostyanov
- All-Russia Research Institute of Phytopathology of the Russian Academy of Sciences, Institute St., 5, Big Vyazyomy, 143050 Moscow, Russia
- A.A. Baikov Institute of Metallurgy and Materials Science (IMET RAS) of the Russian Academy of Sciences, Leninsky Prospect, 49, 119334 Moscow, Russia
| | - Alexey G. Kolmakov
- A.A. Baikov Institute of Metallurgy and Materials Science (IMET RAS) of the Russian Academy of Sciences, Leninsky Prospect, 49, 119334 Moscow, Russia
| | - Mikhail A. Kaplan
- A.A. Baikov Institute of Metallurgy and Materials Science (IMET RAS) of the Russian Academy of Sciences, Leninsky Prospect, 49, 119334 Moscow, Russia
| | - Andrey Drozdov
- Institute for Analytical Instrumentation of the Russian Academy of Sciences, Ulitsa Ivana Chernykh, 31–33, lit. A, 198095 St. Petersburg, Russia
| | - Eteri R. Tolordava
- V. M. Gorbatov Federal Research Center for Food Systems, Russian Academy of Sciences, Talalikhina St., 26, 109316 Moscow, Russia
| | - Anastasia A. Semenova
- V. M. Gorbatov Federal Research Center for Food Systems, Russian Academy of Sciences, Talalikhina St., 26, 109316 Moscow, Russia
| | - Andrey B. Lisitsyn
- V. M. Gorbatov Federal Research Center for Food Systems, Russian Academy of Sciences, Talalikhina St., 26, 109316 Moscow, Russia
| | - Vasily N. Lednev
- Prokhorov General Physics Institute of the Russian Academy of Sciences, Vavilove St. 38, 119991 Moscow, Russia
- Correspondence:
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22
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Kobayashi M, Nishimura F, Kim JH, Yonezawa S. Dyeable Hydrophilic Surface Modification for PTFE Substrates by Surface Fluorination. Membranes (Basel) 2023; 13:57. [PMID: 36676864 PMCID: PMC9865303 DOI: 10.3390/membranes13010057] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/25/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
Polytetrafluoroethylene (PTFE) is the most widely used fluoropolymer that has various functionalities such as heat resistance, chemical resistance, abrasion resistance, and non-adhesiveness. However, PTFE is difficult to dye because of its high water repellency. In this study, the PTFE surface was modified by a combination of gold sputtering and surface fluorination to improve dyeability. X-ray photoelectron spectroscopy indicated that, compared with the untreated sample, the gold-sputtered and acid-washed surface of PTFE had a negligible number of C-F terminals. Furthermore, the intensity of the C-C peak increased drastically. The polar groups (C=O and C-Fx) increased after surface fluorination, which enhanced the electronegativity of the surface according to the zeta potential results. Dyeing tests with methylene blue basic dye showed that the dye staining intensity on the surface of fluorinated PTFE samples was superior to other samples. It is due to the increased surface roughness and the negatively charged surface of fluorinated PTFE samples. The modified PTFE substrates may find broad applicability for dyeing, hydrophilic membrane filters, and other adsorption needs.
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Affiliation(s)
- Mizuki Kobayashi
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Fumihiro Nishimura
- Cooperative Research Center, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Jae-Ho Kim
- Department of Materials Science and Engineering, Faculty of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Susumu Yonezawa
- Cooperative Research Center, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
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23
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Ni J, Lou B, Cui Z, He L, Zhu Z. Assessment of Turning Polytetrafluoroethylene External Cylindrical Groove with Curvilinear Profile Tool. Materials (Basel) 2022; 16:372. [PMID: 36614711 PMCID: PMC9822418 DOI: 10.3390/ma16010372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 12/21/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Polytetrafluoroethylene (PTFE) is extensively used in equipment used for manufacturing semiconductor components and wet etching equipment. However, achieving ideal dimensional accuracy when cutting PTFE is challenging. In this study, we performed cutting experiments using a curvilinear tool and analyzed cutting force, cutting temperature, groove width, and surface roughness in PTFE grooving. The results indicated that the cutting force was most notably affected by the feed rate in Stage I of grooving. The rate of change in cutting force was the largest in Stage II because of the increase in the tool contact area. In Stage III, the shear area of the rake face was the largest, and the cutting force tended to be stable. The groove width was measured with a minimum error rate of 0.95% at a feed rate of 0.05 mm/rev. Moreover, the groove exhibited a time-independent springback. The minimum groove surface roughness was 0.586 at a feed rate of 0.05 mm/rev. The ideal feed rate was 0.05 mm/rev with groove width, surface quality, and chip curl as the key parameters. The processing parameters obtained in this study can be applied to actual production for the optimization of manufacturing accuracy.
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Affiliation(s)
| | | | - Zhi Cui
- Correspondence: (Z.C.); (L.H.)
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24
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Aoki A, Saito A, Shima K, Kimura Y, Asakawa K, Ohashi R, Umezu H, Sakagami T, Moriyama H, Kikuchi T. Occupational Lung Disease Caused by Exposure to Polytetrafluoroethylene. Intern Med 2022; 61:3713-3717. [PMID: 35598992 PMCID: PMC9841090 DOI: 10.2169/internalmedicine.9008-21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
We herein report a 45-year-old-man with multiple foreign body granulomas in the lungs caused by polytetrafluoroethylene (PTFE). A mass in the right lower lobe of the lung and bilateral centrilobular lung nodules were found unexpectedly during the patient's visit to a hospital for a respiratory infection. The patient's occupation for 26 years involved spraying PTFE. A lung biopsy using bronchoscopy revealed granulomatous lesions and giant cells. The presence of fluorine in the granulomatous lesions was confirmed using an electron probe microanalyzer with wavelength dispersive spectrometer. Fluorine is a component of PTFE and is not found in normal lung tissue.
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Affiliation(s)
- Ami Aoki
- Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
| | - Akira Saito
- Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
| | - Kenjiro Shima
- Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
| | - Yosuke Kimura
- Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
| | - Katsuaki Asakawa
- Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
- Department of Respiratory Medicine, Saiseikai Niigata Hospital, Japan
| | - Riuko Ohashi
- Histopathology Core Facility, Faculty of Medicine, Niigata University, Japan
- Division of Molecular and Diagnostic Pathology, Niigata University Graduate School of Medical and Dental Sciences, Japan
| | - Hajime Umezu
- Division of Pathology, Niigata University Medical and Dental Hospital, Japan
| | - Takuro Sakagami
- Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
- Department of Respiratory Medicine, Faculty of Life Sciences, Kumamoto University, Japan
| | - Hiroshi Moriyama
- Department of Respiratory Medicine, National Hospital Organization Nishiniigata Chuo Hospital, Japan
| | - Toshiaki Kikuchi
- Department of Respiratory Medicine and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences, Japan
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Dimitrov K, Kaider A, Granegger M, Gross C, Angleitner P, Wiedemann D, Riebandt J, Schaefer AK, Schlöglhofer T, Laufer G, Zimpfer D. The effect of occlusive polytetrafluoroethylene outflow graft protectors in left ventricular assist device recipients. J Heart Lung Transplant 2022; 41:1850-1857. [PMID: 36137868 DOI: 10.1016/j.healun.2022.07.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 06/20/2022] [Accepted: 07/13/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND The use of polytetrafluoroethylene (PTFE) material as a protective cover for left ventricular assist device (LVAD) outflow grafts (OG) is a common practice. However, it has descriptively been linked to the development of blood flow obstruction (BFO). METHODS Patient data from 194 consecutive HVAD (Medtronic Inc; Medtronic, Minneapolis, MN) recipients implanted between March 2006 and January 2021 were retrospectively analyzed. PTFE covers were used in 102 patients. Study outcomes included the incidence of BFO and survival on LVAD support. RESULTS Thirty-seven patients (19.1%) developed BFO during the study period. On a multivariable Cox regression analysis, PTFE use was an independent predictor for the development of BFO (HR 2.15, 95% CI 1.03-4.48, p = .04). BFO comprised of 2 types of device malfunction: eleven patients (5.7%) developed outflow graft stenosis (OGS), and 31 patients (16.0%) developed pump thrombosis (PT). There was a significantly higher cumulative incidence of OGS in patients with PTFE cover than in those without (Gray's test, p =.03). However, the observed higher cumulative incidence of PT in PTFE patients was non-significant (Gray's test, p =.06). In a multivariable Cox regression model, the effect of PTFE use on survival was non-significant (HR 0.95, 95% CI 0.60-1.48, p =.81), while the development of BFO was independently associated with increased mortality (HR 3.43, 95% CI 1.94-6.06, p < .0001). CONCLUSIONS The use of PTFE OG cover in LVAD patients is associated with an increased cumulative probability of development of BFO, the latter adversely impacting survival and is therefore, harmful.
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Affiliation(s)
- Kamen Dimitrov
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Alexandra Kaider
- Section for Clinical Biometrics, Center for Medical Statistics, Informatics and Intelligent Systems, Medical University of Vienna, Vienna, Austria
| | - Marcus Granegger
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Christoph Gross
- Ludwig-Boltzmann-Institute for Cardiovascular Research, Vienna, Austria; Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Philipp Angleitner
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Dominik Wiedemann
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Julia Riebandt
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | | | - Thomas Schlöglhofer
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria; Ludwig-Boltzmann-Institute for Cardiovascular Research, Vienna, Austria; Center for Medical Physics and Biomedical Engineering, Medical University of Vienna, Vienna, Austria
| | - Günther Laufer
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria
| | - Daniel Zimpfer
- Department of Cardiac Surgery, Medical University of Vienna, Vienna, Austria.
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26
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Ramidan JC, de Mendonça E Bertolini M, Júnior MRM, Portela MB, Lourenço EJV, de Moraes Telles D. Filling Materials Efficacy on Preventing Biofilm Formation Inside Screw Access Channels of Implant Abutments. J ORAL IMPLANTOL 2022; 48:573-577. [PMID: 35503968 DOI: 10.1563/aaid-joi-d-20-00191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 03/13/2022] [Accepted: 03/25/2022] [Indexed: 11/22/2022]
Abstract
The choice of the material used to fill screw access channels in implant-supported prostheses depends, in most cases, on operator's preference, without considering the susceptibility of biofilm colonization. Therefore, the aim of this study was to determine and compare the total amount of biofilm formed on different materials used to fill screw access channels in implant abutments. For this propose, titanium implant analogs were attached on abutments and divided into 5 groups: positive control (no filling material); negative control (closed with resin); and filled with cotton, gutta-percha, or polytetrafluoroethylene (PTFE). The analogs with attached abutments were then immersed in a brain heart infusion medium containing Candida albicans (strain 10231 from American Type Culture Collection [ATCC]) and incubated aerobically at 37°C with gentle agitation. After 15 days, materials were removed, and total viable biofilm on each material was quantified by methyl tetrazolium reduction assay at 490 nm. All experiments were performed in triplicate. Data were processed by IBM SPSS Statistic software using 1-way analysis of variance and Bonferroni post hoc tests to analyze differences between groups, with an overall significance level of P < .001. A significant difference was observed between cotton and gutta-percha (P < .017) and between cotton and PTFE (P < .025). However, there was no statistical difference between gutta-percha and PTFE (P > .050). Thus, this in vitro experiment showed that gutta-percha and PTFE presented lower biofilm formation compared with cotton when used to fill screw access channels. These results can provide a basis for future clinical studies that can be a guide to decreasing the occurrence of gaps and bacterial growth inside the implant/abutment attachment site. In addition, controlled in vivo studies are necessary to confirm the clinical viability of findings of this study.
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Affiliation(s)
- Juliana Cabral Ramidan
- Department of Prosthodontics, School of Dentistry, Rio de Janeiro State University, Rio de Janeiro, Brazil
| | - Martinna de Mendonça E Bertolini
- Department of Oral Health and Diagnostic Sciences, Division of Periodontology, University of Connecticut Health Center, Farmington, Connecticut, USA
| | | | - Maristela Barbosa Portela
- Department of Clinics and Pediatric Dentistry, School of Dentistry, Fluminense Federal University, Niteroi, Rio de Janeiro, Brazil
| | | | - Daniel de Moraes Telles
- Department of Prosthodontics, School of Dentistry, Rio de Janeiro State University, Rio de Janeiro, Brazil
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27
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Fernández L, Monzonís AM, El-Diasty MM, Álvarez-Lorenzo C, Concheiro Á, Fernández ÁL. Biomechanical characteristics of different methods of neo-chordal fixation to the papillary muscles. J Card Surg 2022; 37:4408-4415. [PMID: 36229983 PMCID: PMC10092600 DOI: 10.1111/jocs.17027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 08/15/2022] [Accepted: 09/03/2022] [Indexed: 01/06/2023]
Abstract
BACKGROUND AND AIM OF THE STUDY Several techniques have been described for neo-chordal fixation to the papillary muscles without any reported clinical differences. The objective of this study is to compare in vitro the biomechanical properties of four of these common techniques. METHODS We studied the biomechanical properties of expanded polytetrafluoroethylene neo-chordal fixation using four techniques: nonknotted simple stitch, nonknotted figure-of-eight stitch, knotted pledgeted mattress stitch, and knotted pledgeted stitch using commercially available prefabricated loops. Neo-chordae were submitted to a total of 20 traction-relaxation cycles with incremental loads of 1, 2, and 4 N. We calculated the elongation, the force-strain curve, elasticity, and the maximum tolerated load before neo-chordal failure. RESULTS The elongation of the neo-chordae was lowest in the simple stitch followed by the figure-of-eight, the pledgeted mattress, and he commercially prefabricated loops (p < .001). Conversely, the elastic modulus was highest in the simple stitch followed by the figure-of-eight, the pledgeted mattress, and the prefabricated loops (p < .001). The maximum tolerated load was similar with the simple stitch (28.87 N) and with the figure-of-eight stitch (31.39 N) but was significantly lower with the pledgeted mattress stitch (20.51 N) and with the prefabricated loops (7.78 N). CONCLUSION In vitro, neo-chordal fixation by nonknotted simple or nonknotted figure-of-eight stitches resulted in less compliance as opposed to the use of knotted pledgeted stitches. Fixation technique seemed to influence neo-chordal biomechanical properties, however, it did not seem to affect the strength of the suture when subjected to loads within physiological ranges.
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Affiliation(s)
- Luis Fernández
- Department of Applied Physics, School of Physics, University of Santiago de Compostela, Santiago, Spain
| | | | | | - Carmen Álvarez-Lorenzo
- Department of Pharmacology, Pharmacy, and Pharmaceutical Technology, University of Santiago de Compostela, Santiago, Spain
| | - Ángel Concheiro
- Department of Pharmacology, Pharmacy, and Pharmaceutical Technology, University of Santiago de Compostela, Santiago, Spain
| | - Ángel L Fernández
- Divison of Cardiac Surgery, Department of Surgery, University Hospital, University of Santiago de Compostela, Santiago, Spain
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28
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Ni J, Zeng X, Al-Furjan MSH, Zhao H, Guan L, Cui Z, Han L. Effect of Drilling Parameters on Machining Performance in Drilling Polytetrafluoroethylene. Materials (Basel) 2022; 15:6922. [PMID: 36234268 PMCID: PMC9570827 DOI: 10.3390/ma15196922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 10/02/2022] [Accepted: 10/03/2022] [Indexed: 06/16/2023]
Abstract
Polytetrafluoroethylene (PTFE) plays an important role in semiconductor manufacturing. It is an important processing material for the key sealing components in the field of immersion lithography. The lack of research related to the mechanical processing of PTFE leads to many challenges in producing complex parts. This paper conducted a drilling experiment on PTFE. The effect of cutting parameters on the drilling performance was investigated. Thrust, torque, surface roughness, and drilling temperature were used to evaluate the influence of cutting parameters on drilling performance. In addition, the empirical mathematical models of thrust and torque were developed using analysis of variance (ANOVA). The results indicated that the spindle speed had the most important effect on the thrust and the feed rate had the most significant effect on the torque. The lowest values of thrust and torque were, respectively, 22.64 N and 0.12 Nm, achieved in the case of spindle speed of 5000 rev/min, and feed rate of 50 mm/min. The surface quality is also best at this cutting parameter. Studies have shown that higher spindle speeds with lower feed rates are ideal parameters for improving the drilling performance and machining quality of PTFE. In addition, it was found that the temperature differences due to different drilling depths were related to chip accumulation. Surface roughness inconsistencies at various locations in the inner wall of the hole were influenced by chip adhesion during machining. This paper provides a suggestion for optimizing cutting parameters and hole quality.
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Affiliation(s)
- Jing Ni
- School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Xiaotian Zeng
- School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - M. S. H. Al-Furjan
- School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
- State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
| | - Huijun Zhao
- School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Liming Guan
- School of Mechanical Engineering, Hangzhou Dianzi University Information Engineering College, Hangzhou 311305, China
| | - Zhi Cui
- School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
| | - Lidong Han
- School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
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29
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Liao M, Zhu Y, Gong G, Qiao L. Thin-Film Composite Membranes with a Carbon Nanotube Interlayer for Organic Solvent Nanofiltration. Membranes (Basel) 2022; 12:817. [PMID: 36005732 PMCID: PMC9414755 DOI: 10.3390/membranes12080817] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
Compared to the traditional chemical-crosslinking-based polymer, the porous polytetrafluoroethylene (PTFE) substrate is considered to be an excellent support for the fabrication of thin-film composite (TFC) organic solvent nanofiltration (OSN) membranes. However, the low surface energy and chemical inertness of PTFE membranes presented major challenges for fabricating a polyamide active layer on its surface via interfacial polymerization (IP). In this study, a triple-layered TFC OSN membrane was fabricated via IP, which consisted of a PA top layer on a carbon nanotube (CNT) interlayer covering the macroporous PTFE substrate. The defect-free formation and cross-linking degree of the PA layer can be improved by controlling the CNT deposition amount to achieve a good OSN performance. This new TFC OSN membrane exhibited a high dye rejection (the rejection of Bright blue B > 97%) and a moderate and stable methanol permeated flux of approximately 8.0 L m−2 h−1 bar−1. Moreover, this TFC OSN membrane also exhibited an excellent solvent resistance to various organic solvents and long-term stability during a continuous OSN process.
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Affiliation(s)
- Mingjia Liao
- Chemical Engineering Department, Chongqing Chemical Industry Vocational College, Chongqing 401228, China
| | - Yun Zhu
- Institute of Resources and Security, Chongqing Vocational Institute of Engineering, Chongqing 401228, China
| | - Genghao Gong
- State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Lei Qiao
- Chongqing Academy of Eco-environmental Sciences, Chongqing 401147, China
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Kim GI, Jung J, Min WK, Kim MS, Jung S, Choi DH, Chung J, Kim HJ. Mechanically Durable Organic/High- k Inorganic Hybrid Gate Dielectrics Enabled by Plasma-Polymerization of PTFE for Flexible Electronics. ACS Appl Mater Interfaces 2022; 14:28085-28096. [PMID: 35680562 DOI: 10.1021/acsami.2c04340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
To achieve both the synergistic advantages of outstanding flexibility in organic dielectrics and remarkable dielectric/insulating properties in inorganic dielectrics, a plasma-polymerized hafnium oxide (HfOx) hybrid (PPH-hybrid) dielectric is proposed. Using a radio-frequency magnetron cosputtering process, the high-k HfOx dielectric is plasma-polymerized with polytetrafluoroethylene (PTFE), which is a flexible, thermally stable, and hydrophobic fluoropolymer dielectric. The PPH-hybrid dielectric with a high dielectric constant of 14.17 exhibits excellent flexibility, maintaining a leakage current density of ∼10-8 A/cm2 even after repetitive bending stress (up to 10000 bending cycles with a radius of 2 mm), whereas the HfOx dielectric degrades to be leaky. To evaluate its practical applicability to flexible thin-film transistors (TFTs), the PPH-hybrid dielectric is applied to amorphous indium-gallium-zinc oxide (IGZO) TFTs as a gate dielectric. Consequently, the PPH-hybrid dielectric-based IGZO TFTs exhibit stable electrical performance under the same harsh bending cycles: a field-effect mobility of 16.99 cm2/(V s), an on/off current ratio of 1.15 × 108, a subthreshold swing of 0.35 V/dec, and a threshold voltage of 0.96 V (averaged in nine devices). Moreover, the PPH-hybrid dielectric-based IGZO TFTs exhibit a reduced I-V hysteresis and an enhanced positive bias stress stability, with the threshold voltage shift decreasing from 4.99 to 1.74 V, due to fluorine incorporation. These results demonstrate that PTFE improves both the mechanical durability and electrical stability, indicating that the PPH-hybrid dielectric is a promising candidate for high-performance and low-power flexible electronics.
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Affiliation(s)
- Gwan In Kim
- School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Joohye Jung
- School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
- Display R&D Center, Samsung Display Co., Ltd., 181 Samsung-ro, Tangjeong-myeon, Asan-Si 31454, Republic of Korea
| | - Won Kyung Min
- School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Min Seong Kim
- School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Sujin Jung
- School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Dong Hyun Choi
- School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Jusung Chung
- School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
| | - Hyun Jae Kim
- School of Electrical and Electronic Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea
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31
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Lee S, Kang KK, Sung SE, Choi JH, Sung M, Seong KY, Lee J, Kang S, Yang SY, Lee S, Lee KR, Seo MS, Kim K. In Vivo Toxicity and Pharmacokinetics of Polytetrafluoroethylene Microplastics in ICR Mice. Polymers (Basel) 2022; 14:polym14112220. [PMID: 35683896 PMCID: PMC9182653 DOI: 10.3390/polym14112220] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 05/09/2022] [Accepted: 05/26/2022] [Indexed: 12/04/2022] Open
Abstract
The increased use of plastics has led to severe environmental pollution, particularly by microplastics—plastic particles 5 mm or less in diameter. These particles are formed by environmental factors such as weathering and ultraviolet irradiation, thereby making environmental pollution worse. This environmental pollution intensifies human exposure to microplastics via food chains. Despite potential negative effects, few toxicity assessments on microplastics are available. In this study, two sizes of polytetrafluoroethylene (PTFE) microplastics, approximately 5 μm and 10–50 μm, were manufactured and used for single and four-week repeated toxicity and pharmacokinetic studies. Toxicological effects were comprehensively evaluated with clinical signs, body weight, food and water consumption, necropsy findings, and histopathological and clinical-pathological examinations. Blood collected at 15, 30 60, and 120 min after a single administration of microplastics were analyzed by Raman spectroscopy. In the toxicity evaluation of single and four-week repeated oral administration of PTFE microplastics, no toxic changes were observed. Therefore, the lethal dose 50 (LD50) and no-observed-adverse-effect-level (NOAEL) of PTFE microplastics in ICR mice were established as 2000 mg/kg or more. PTFE microplastics were not detected in blood, so pharmacokinetic parameters could not be calculated. This study provides new insight into the long-term toxicity and pharmacokinetics of PTFE microplastics.
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Affiliation(s)
- Sijoon Lee
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu 41061, Korea; (S.L.); (K.-K.K.); (S.-E.S.); (J.-H.C.); (M.S.)
- Institute of Animal Medicine & Department of Veterinary Medicine, Gyeongsang National University, Jinju 52828, Korea
| | - Kyung-Ku Kang
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu 41061, Korea; (S.L.); (K.-K.K.); (S.-E.S.); (J.-H.C.); (M.S.)
| | - Soo-Eun Sung
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu 41061, Korea; (S.L.); (K.-K.K.); (S.-E.S.); (J.-H.C.); (M.S.)
- Department of Biomaterials Science (BK21 Four Program), Life and Industry Convergence Institute, Pusan National University, Miryang 50463, Korea; (K.-Y.S.); (J.L.); (S.K.); (S.Y.Y.)
| | - Joo-Hee Choi
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu 41061, Korea; (S.L.); (K.-K.K.); (S.-E.S.); (J.-H.C.); (M.S.)
| | - Minkyoung Sung
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu 41061, Korea; (S.L.); (K.-K.K.); (S.-E.S.); (J.-H.C.); (M.S.)
| | - Keum-Yong Seong
- Department of Biomaterials Science (BK21 Four Program), Life and Industry Convergence Institute, Pusan National University, Miryang 50463, Korea; (K.-Y.S.); (J.L.); (S.K.); (S.Y.Y.)
| | - Jian Lee
- Department of Biomaterials Science (BK21 Four Program), Life and Industry Convergence Institute, Pusan National University, Miryang 50463, Korea; (K.-Y.S.); (J.L.); (S.K.); (S.Y.Y.)
| | - Subin Kang
- Department of Biomaterials Science (BK21 Four Program), Life and Industry Convergence Institute, Pusan National University, Miryang 50463, Korea; (K.-Y.S.); (J.L.); (S.K.); (S.Y.Y.)
| | - Seong Yun Yang
- Department of Biomaterials Science (BK21 Four Program), Life and Industry Convergence Institute, Pusan National University, Miryang 50463, Korea; (K.-Y.S.); (J.L.); (S.K.); (S.Y.Y.)
| | - Sunjong Lee
- Korea Institute of Industrial Technology, Cheonan 31056, Korea;
| | - Kyeong-Ryoon Lee
- Laboratory Animal Resource Center, Korea Research Institute of Bioscience and Biotechnology, Cheongju 28116, Korea;
- Department of Bioscience, University of Science and Technology, Daejeon 34113, Korea
| | - Min-Soo Seo
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu 41061, Korea; (S.L.); (K.-K.K.); (S.-E.S.); (J.-H.C.); (M.S.)
- Correspondence: (M.-S.S.); (K.K.); Tel.: +82-53-790-5727 (M.-S.S.); +82-53-790-5700 (K.K.)
| | - KilSoo Kim
- Preclinical Research Center, Daegu-Gyeongbuk Medical Innovation Foundation, Daegu 41061, Korea; (S.L.); (K.-K.K.); (S.-E.S.); (J.-H.C.); (M.S.)
- College of Veterinary Medicine, Kyungpook National University, 80 Dahakro, Buk-gu, Daegu 41566, Korea
- Correspondence: (M.-S.S.); (K.K.); Tel.: +82-53-790-5727 (M.-S.S.); +82-53-790-5700 (K.K.)
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Berladir K, Zhyhylii D, Gaponova O, Krmela J, Krmelová V, Artyukhov A. Modeling of Polymer Composite Materials Chaotically Reinforced with Spherical and Cylindrical Inclusions. Polymers (Basel) 2022; 14:2087. [PMID: 35631969 PMCID: PMC9144413 DOI: 10.3390/polym14102087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Revised: 05/14/2022] [Accepted: 05/18/2022] [Indexed: 11/16/2022] Open
Abstract
The technical and economic efficiency of new PCMs depends on the ability to predict their performance. The problem of predicting the properties of PCMs can be solved by computer simulation by the finite element method. In this work, an experimental determination of the physical and mechanical properties of PTFE PCMs depending on the concentration of fibrous and dispersed filler was carried out. A finite element model in ANSYS APDL was built to simulate the strength and load-bearing capacity of the material with the analysis of damage accumulation. Verification of the developed computer model to predict the mechanical properties of composite materials was performed by comparing the results obtained during field and model experiments. It was found that the finite element model predicts the strength of chaotically reinforced spherical inclusions of composite materials. This is due to the smoothness of the filler surfaces and the lack of filler dissection in the model. Instead, the prediction of the strength of a finite element model of chaotically reinforced cylindrical inclusions of composite materials requires additional analysis. The matrix and the fibrous filler obviously have stress concentrators and are both subject to the difficulties of creating a reliable structural model.
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Affiliation(s)
- Kristina Berladir
- Department of Applied Materials Science and Technology of Constructional Materials, Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine;
| | - Dmytro Zhyhylii
- Department of Computational Mechanics Named after Volodymyr Martsynkovskyy, Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine;
| | - Oksana Gaponova
- Department of Applied Materials Science and Technology of Constructional Materials, Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine;
| | - Jan Krmela
- Faculty of Mechanical Engineering, J. E. Purkyně University in Ustí nad Labem, Pasteurova 1, 400 96 Ustí nad Labem, Czech Republic;
| | - Vladimíra Krmelová
- Faculty of Industrial Technologies in Púchov, Alexander Dubček University of Trenčín, I. Krasku 491/30, 02001 Púchov, Slovakia;
| | - Artem Artyukhov
- Academic and Research Institute of Business, Economics and Management, Sumy State University, 2, Rymskogo-Korsakova St., 40007 Sumy, Ukraine;
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Solomonov M, Levy DH, Yaya A, Ben Itzhak J, Polak D. Antimicrobial evaluation of polytetrafluoroethylene used as part of temporary restorations: An ex vivo study. AUST ENDOD J 2022; 48:98-104. [PMID: 35267229 DOI: 10.1111/aej.12617] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 11/30/2021] [Accepted: 02/28/2022] [Indexed: 11/28/2022]
Abstract
The use of polytetrafluoroethylene (PTFE) tape as the base layer of temporary restorations had gained popularity mainly due to the ease of manipulation. The aim of this study was to assess whether this method changes the potential for bacterial growth and leakage of temporary restorations. The direct contact test and live/dead fluorescent staining were used for comparing Enterococcus faecalis growth and biofilm formation on PTFE, composite, intermediate restorative material (IRM) and Coltosol F. Confocal laser scanning microscopy was employed to evaluate E. faecalis penetration through 2 mm of PTFE, IRM or Coltosol F placed on the bottom of the pulp chamber and into radicular dentinal tubules in extracted maxillary third molars. The results demonstrated that E. faecalis grows on and penetrates through PTFE significantly more than it does with IRM and Coltosol F, revealing its comparably reduced overall antimicrobial sealing ability when placed as the base part of temporary restorations.
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Affiliation(s)
- Michael Solomonov
- Department of Endodontics, IDF Medical Corps, Sheba Medical Center, Tel Hashomer, Tel Aviv, Israel
| | - Dan Henry Levy
- Department of Endodontics, IDF Medical Corps, Sheba Medical Center, Tel Hashomer, Tel Aviv, Israel
| | - Alin Yaya
- Department of Periodontics, Faculty of Dentistry, Hadassah Medical Center, Jerusalem, Israel
| | - Joe Ben Itzhak
- Department of Endodontics, IDF Medical Corps, Sheba Medical Center, Tel Hashomer, Tel Aviv, Israel
| | - David Polak
- Department of Periodontics, Faculty of Dentistry, Hadassah Medical Center, Jerusalem, Israel
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Xu Q, Zhang J, Li X, van Duin DM, Hu Y, van Duin ACT, Ma T. How Polytetrafluoroethylene Lubricates Iron: An Atomistic View by Reactive Molecular Dynamics. ACS Appl Mater Interfaces 2022; 14:6239-6250. [PMID: 35049265 DOI: 10.1021/acsami.1c23950] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The tribochemistry and transfer film formation at the metal/polymer interface plays an essential role in surface protection, wear reduction, and lubrication. Although the topic has been studied for decades, challenges persist in clarifying the nanoscale mechanism and dynamic evolution of tribochemical reactions. To investigate the tribochemistry between iron and polytetrafluoroethylene (PTFE) in ambient and cryogenic environments, we have trained and expanded a ReaxFF reactive force field to describe iron-oxygen-water-PTFE systems (C/H/O/F/Fe). Using ReaxFF molecular dynamics simulations, we find that mechanical shearing of single asperity induced the degradation of PTFE molecules and radicals, showing subsequent oxidation and hydroxylation reactions of the radicals initiated by C-C bond cleavage, in agreement with previous experimental observations. Furthermore, we studied mechanisms of interfacial tribochemical reactions and formation of transfer films. We found that tribochemical wear and Fe-C and Fe-F bonding networks are important mechanisms for anchoring molecular chains to form a transfer film on the iron countersurface. Hydroxyl groups can dehydrogenate to form short and strong chelation bonds with the Fe2O3 countersurface. A friction-induced oriented molecular layer plays a key role in reducing friction, which is responsible for the excellent lubrication property. By varying temperatures in the range of 10-300 K, we found a nonmonotonic change in friction with a maxima at 100 K. At cryogenic temperatures, the molecular mobility was obviously suppressed, while the chain rigidity was enhanced, resulting in the less oriented interface and brittle-like shear interface, which is responsible for nonmonotonic friction. This work elucidates mechanisms of tribochemical reactions and transfer film formation between iron and PTFE at the atomistic level, facilitating design and development of self-lubricating materials, especially under harsh conditions.
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Affiliation(s)
- Qiang Xu
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | - Jie Zhang
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | - Xin Li
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Diana M van Duin
- RxFF_Consulting LLC, State College, Pennsylvania 16801, United States
| | - Yuanzhong Hu
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
| | - Adri C T van Duin
- RxFF_Consulting LLC, State College, Pennsylvania 16801, United States
- Department of Mechanical Engineering, Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
| | - Tianbao Ma
- State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
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Dahl RH, Larsen RW, Thormann E, Benndorf G. Polytetrafluoroethylene coating fragments during neuroendovascular therapy: An analysis of two damaged microguidewires. Interv Neuroradiol 2022; 28:16-21. [PMID: 34039049 PMCID: PMC8905087 DOI: 10.1177/15910199211015127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Cerebral polymer coating embolism from intravascular devices represents a potentially serious complication to endovascular therapy (EVT). We report two cases of neuroendovascular treatment where filamentous polymer fragments were noted possibly due to damage of the surface coating during manipulation and backloading of microguidewires. As the exact origin of the debris was initially not known, microguidewires and fragments were examined with light microscopy, stereomicroscopy, scanning electron microscopy and attenuated-total-reflection Fourier transform infrared spectroscopy. Fragments consisted of polytetrafluoroethylene and silicone oil stemming from the proximal shaft of a standard microguidewire. To our knowledge, this is the first report of polytetrafluoroethylene coating fragments created during EVT. Future studies should assess the mechanism of polymer coating delamination and its potential consequences during EVT including inadvertent fragment migration into the cerebral circulation.
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Affiliation(s)
- Rasmus Holmboe Dahl
- Department of Radiology, University Hospital Rigshospitalet, Copenhagen, Denmark,Department of Radiology, Næstved-Slagelse Hospitals, Denmark
| | - René Wugt Larsen
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Esben Thormann
- Department of Chemistry, Technical University of Denmark, Kongens Lyngby, Denmark
| | - Goetz Benndorf
- Department of Radiology, University Hospital Rigshospitalet, Copenhagen, Denmark,Department of Radiology, Baylor College of Medicine, Houston, TX, USA,Goetz Benndorf, Department of Radiology, University Hospital Rigshospitalet, Copenhagen DK-2100, Denmark.
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36
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Deaconescu T, Deaconescu A. Experimental Research on Polymer-Based Coaxial Sealing Systems of Hydraulic Cylinders for Small Displacement Velocities. Polymers (Basel) 2022; 14:polym14020290. [PMID: 35054694 PMCID: PMC8779439 DOI: 10.3390/polym14020290] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/08/2022] [Accepted: 01/10/2022] [Indexed: 12/10/2022] Open
Abstract
Reducing friction in the coaxial sealing systems of hydraulic cylinders is one of the solutions for increasing the energy efficiency of industrial actuations. This is a requirement, particularly in the case of small velocities that carry the risk of eigen-vibrations and/or stick-slip. The authors discuss the experimental research conducted on three coaxial sealing systems made from thermoplastic polymer and polyurethane type materials. The paper presents the equipment and method used for the experimental determination of static and kinematic friction coefficients and discusses the subsequent results obtained to test different working parameters. The experimentally determined friction coefficients yielded a range of materials recommended for coaxial seals such as to minimize the occurrence of jerky operation.
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de Boer M, Shiraev T, Loa J. Use of Suture-Mediated Closure Devices for Closure of Punctures in Prosthetic Patches or Grafts is Associated With High Rates of Technical Success and Low Complication Rates. Vasc Endovascular Surg 2022; 56:263-268. [PMID: 34982601 DOI: 10.1177/15385744211068626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Despite the increasing use of endovascular techniques in the management of peripheral vascular disease, there is little data on the safety of percutaneous closure devices in punctures of synthetic vascular material. Our paper sought to address this paucity in the literature by reviewing the incidence of complications occurring in patients in whom the ProGlide device was utilised to achieve haemostasis post-percutaneous puncture of vascular patches and graft materials. METHODS A retrospective review of patient records was conducted at a tertiary referral centre. Patients who had undergone percutaneous punctures of prosthetic bypass grafts or patch angioplasties between January 2011 and December 2020 were identified from a prospectively collected database. Medical records and post-procedural imaging were reviewed to assess the occurrence of post-procedural complications such as pseudoaneurysms, puncture site stenosis and further interventions for access complications. RESULTS A total of 73 punctures of prosthetic material were performed in 42 patients, of which 39 utilised ProGlides. Median age of included patients was 72 years. There was male predominance in the cohort (69.8%), and most punctures (87.3%) were through polyurethane patches. Device success rate was 95%, and no patients required open repair. There was a low incidence of complications, with no patients developing pseudoaneurysms, arteriovenous fistulas, ischaemic limbs or > 50% stenosis when either manual pressure or the ProGlide device was used to achieve haemostasis. Furthermore, there were no returns to theatre or further interventions performed for access site complications. CONCLUSION The use of the ProGlide closure device has a low incidence of complications and its safety appears to be equivalent to manual compression when used to achieve haemostasis in percutaneous punctures of synthetic vascular material in select patients. To our knowledge, this is the only article to date to assess the safety of the ProGlide in this setting.
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Affiliation(s)
- Madeleine de Boer
- Department of Vascular Surgery, Royal Prince Alfred Hospital, Camperdown, NSW, Australia
| | - Timothy Shiraev
- Department of Vascular Surgery, Royal Prince Alfred Hospital, Camperdown, NSW, Australia.,School of Medicine, University of Notre Dame, Darlinghurst, NSW, Australia
| | - Jacky Loa
- Department of Vascular Surgery, Royal Prince Alfred Hospital, Camperdown, NSW, Australia
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Jain S. Efficacy of Various Implant Abutment Screw Access Channel Sealing Materials in Preventing Microleakage: A Systematic Review. J ORAL IMPLANTOL 2021; 48:455-463. [PMID: 34965295 DOI: 10.1563/aaid-joi-d-21-00085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of this systematic review is to evaluate the effectiveness of different materials used for sealing dental implant abutment screw access channel (ASAC), in preventing microleakage. As per the searched indexed English literature, this study is the first review of its kind. Indexed English literature published up to 20 th February 2021 was systematically searched on relevant electronic data bases. The recommendations specified by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) were applied for constructing framework, and reporting the current review. The focused PICO question was: "Which material (C) is more effective in sealing (I) implant ASAC (P) in terms of causing minimal microbial leakage (O)". Quality of articles was assessed with modified CONSORT scale for in vitro studies. Five in vitro studies were selected for qualitative analysis after final stage screening. Modified CONSORT scale suggested that out of the five selected studies, one each was of low and high quality, whereas three studies were of moderate quality. Included studies had contrasting results related to the efficacy these materials as sealants in ASAC. Sealing capacity against microleakage should be considered as one of the important criteria while selecting the material to fill implant ASAC. Definitive conclusions asserting superiority of a single material over others are difficult to draw, due to non-homogeneity in study design of the included papers. More studies should be conducted in the near future to investigate the efficacy of various combination of materials in preventing micro leakage.
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Affiliation(s)
- Saurabh Jain
- Jazan University Faculty of Dentistry Assistant Professor Prosthetic Dental Sciences Al-Shwajra Sabya road SAUDI ARABIA Jazan Jazan 45142 +966550049588 Jazan University Faculty of Dentistry
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Xiong X, Venkataraman M, Yang T, Militký J, Wiener J. Preparation and Characterization of Electrosprayed Aerogel/ Polytetrafluoroethylene Microporous Materials. Polymers (Basel) 2021; 14:48. [PMID: 35012069 PMCID: PMC8747099 DOI: 10.3390/polym14010048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 12/17/2021] [Accepted: 12/21/2021] [Indexed: 11/23/2022] Open
Abstract
This paper presents the preparation of aerogel/polytetrafluoroethylene (PTFE) microporous materials via needleless electrospray technique, by using an aqueous dispersion of polytetrafluoroethylene as the basic spinning liquid. Different contents of aerogel powders were applied to the spinning liquid for electrospraying to investigate the effect on the structural characteristics and various properties of the materials. Cross-section, surface morphology, and particle size distribution of the electrosprayed materials were examined. Surface roughness, hydrophobicity, and thermal conductivity were evaluated and discussed. The results showed that the electrosprayed aerogel/PTFE layers were compact and disordered stacking structures composed of spherical particles with a rough surface. As the aerogel content increased, the electrosprayed materials demonstrated increased surface roughness and improved surface hydrophobicity with a contact angle up to 147.88°. In addition, the successful achievement of thermal conductivity as low as 0.024 (W m-1 K-1) indicated a superior ability of the prepared aerogel/PTFE composites to prevent heat transfer. This study contributes to the field of development of aerogel/PTFE composites via electrospray technique, providing enhanced final performance for potential use as thermal and moisture barriers in textiles or electronic devices.
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Affiliation(s)
- Xiaoman Xiong
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, 46117 Liberec, Czech Republic; (M.V.); (J.M.); (J.W.)
| | - Mohanapriya Venkataraman
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, 46117 Liberec, Czech Republic; (M.V.); (J.M.); (J.W.)
| | - Tao Yang
- Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, 46117 Liberec, Czech Republic;
| | - Jiří Militký
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, 46117 Liberec, Czech Republic; (M.V.); (J.M.); (J.W.)
| | - Jakub Wiener
- Department of Material Engineering, Faculty of Textile Engineering, Technical University of Liberec, 46117 Liberec, Czech Republic; (M.V.); (J.M.); (J.W.)
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Luo Y, Shen Z, Ma Z, Chen H, Wang X, Luo M, Wang R, Huang J. A Cleanable Self-Assembled Nano-SiO 2/(PTFE/PEI) n/PPS Composite Filter Medium for High-Efficiency Fine Particulate Filtration. Materials (Basel) 2021; 14:7853. [PMID: 34947457 PMCID: PMC8706235 DOI: 10.3390/ma14247853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/13/2021] [Accepted: 12/15/2021] [Indexed: 11/16/2022]
Abstract
A silicon dioxide/polytetrafluoroethylene/polyethyleneimine/polyphenylene sulfide (SiO2/PTFE/PEI/PPS) composite filter medium with three-dimensional network structures was fabricated by using PPS nonwoven as the substrate which was widely employed as a cleanable filter medium. The PTFE/PEI bilayers were firstly coated on the surfaces of the PPS fibers through the layer-by-layer self-assembly technique ten times, followed by the deposition of SiO2 nanoparticles, yielding the SiO2/(PTFE/PEI)10/PPS composite material. The contents of the PTFE component were easily controlled by adjusting the number of self-assembled PTFE/PEI bilayers. As compared with the pure PPS nonwoven, the obtained SiO2/(PTFE/PEI)10/PPS composite material exhibits better mechanical properties and enhanced wear, oxidation and heat resistance. When employed as a filter material, the SiO2/(PTFE/PEI)10/PPS composite filter medium exhibited excellent filtration performance for fine particulate. The PM2.5 (particulate matter less than 2.5 μm) filtration efficiency reached up to 99.55%. The superior filtration efficiency possessed by the SiO2/(PTFE/PEI)10/PPS composite filter medium was due to the uniformly modified PTFE layers, which played a dual role in fine particulate filtration. On the one hand, the PTFE layers not only increase the specific surface area and pore volume of the composite filter material but also narrow the spaces between the fibers, which were conducive to forming the dust cake quickly, resulting in intercepting the fine particles more efficiently than the pure PPS filter medium. On the other hand, the PTFE layers have low surface energy, which is in favor of the detachment of dust cake during pulse-jet cleaning, showing superior reusability. Thanks to the three-dimensional network structures of the SiO2/(PTFE/PEI)10/PPS composite filter medium, the pressure drop during filtration was low.
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Affiliation(s)
- Yan Luo
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
- Shaoxing Testing Institute of Quality and Technical Supervision, Market Supervision Administration of Shaoxing Municipahty, Shaoxing 312366, China; (Z.M.); (X.W.); (M.L.)
| | - Zhongyun Shen
- Shaoxing Testing Institute of Quality and Technical Supervision, Market Supervision Administration of Shaoxing Municipahty, Shaoxing 312366, China; (Z.M.); (X.W.); (M.L.)
| | - Zhihao Ma
- Shaoxing Testing Institute of Quality and Technical Supervision, Market Supervision Administration of Shaoxing Municipahty, Shaoxing 312366, China; (Z.M.); (X.W.); (M.L.)
| | - Hongfeng Chen
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
- Shaoxing Testing Institute of Quality and Technical Supervision, Market Supervision Administration of Shaoxing Municipahty, Shaoxing 312366, China; (Z.M.); (X.W.); (M.L.)
| | - Xiaodong Wang
- Shaoxing Testing Institute of Quality and Technical Supervision, Market Supervision Administration of Shaoxing Municipahty, Shaoxing 312366, China; (Z.M.); (X.W.); (M.L.)
| | - Minger Luo
- Shaoxing Testing Institute of Quality and Technical Supervision, Market Supervision Administration of Shaoxing Municipahty, Shaoxing 312366, China; (Z.M.); (X.W.); (M.L.)
| | - Ran Wang
- CAM-China Productivity Center for Machinery, China Academy of Machinery Science and Technology, Beijing 100044, China;
| | - Jianguo Huang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China;
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Vesel A, Zaplotnik R, Primc G, Mozetič M, Katan T, Kargl R, Mohan T, Kleinschek KS. Rapid Functionalization of Polytetrafluorethylene (PTFE) Surfaces with Nitrogen Functional Groups. Polymers (Basel) 2021; 13:4301. [PMID: 34960856 PMCID: PMC8708819 DOI: 10.3390/polym13244301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 12/03/2021] [Accepted: 12/06/2021] [Indexed: 11/16/2022] Open
Abstract
The biocompatibility of body implants made from polytetrafluoroethylene (PTFE) is inadequate; therefore, the surface should be grafted with biocompatible molecules. Because PTFE is an inert polymer, the adhesion of the biocompatible film may not be appropriate. Therefore, the PFTE surface should be modified to enable better adhesion, preferably by functionalization with amino groups. A two-step process for functionalization of PTFE surface is described. The first step employs inductively coupled hydrogen plasma in the H-mode and the second ammonia plasma. The evolution of functional groups upon treatment with ammonia plasma in different modes is presented. The surface is saturated with nitrogen groups within a second if ammonia plasma is sustained in the H-mode at the pressure of 35 Pa and forward power of 200 W. The nitrogen-rich surface film persists for several seconds, while prolonged treatment causes etching. The etching is suppressed but not eliminated using pulsed ammonia plasma at 35 Pa and 200 W. Ammonia plasma in the E-mode at the same pressure, but forward power of 25 W, causes more gradual functionalization and etching was not observed even at prolonged treatments up to 100 s. Detailed investigation of the XPS spectra enabled revealing the surface kinetics for all three cases.
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Affiliation(s)
- Alenka Vesel
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Rok Zaplotnik
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Gregor Primc
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Miran Mozetič
- Department of Surface Engineering, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (R.Z.); (G.P.); (M.M.)
| | - Tadeja Katan
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Rupert Kargl
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Tamilselvan Mohan
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
| | - Karin Stana Kleinschek
- Institute for Chemistry and Technology of Biobased Systems, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria; (T.K.); (R.K.); (T.M.); (K.S.K.)
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Smolyanskii AS, Politova ED, Koshkina OA, Arsentyev MA, Kusch PP, Moskvitin LV, Slesarenko SV, Kiryukhin DP, Trakhtenberg LI. Structure of Polytetrafluoroethylene Modified by the Combined Action of γ-Radiation and High Temperatures. Polymers (Basel) 2021; 13:3678. [PMID: 34771235 DOI: 10.3390/polym13213678] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/11/2021] [Accepted: 10/12/2021] [Indexed: 01/26/2023] Open
Abstract
By means of X-ray computed microtomography (XCMT), the existence of a developed porous structure with an average pore diameter of ~3.5 μm and pore content of ~1.1 vol.% has been revealed in unirradiated polytetrafluoroethylene (PTFE). It has been found that the combined action of gamma radiation (absorbed dose per PTFE of ~170 kGy) and high temperatures (327–350 °C) leads to the disappearance of the porous structure and the formation of several large pores with sizes from 30 to 50 μm in the bulk of thermal-radiation modified PTFE (TRM-PTFE). It has been established by X-ray diffraction (XRD) analysis that the thermal-radiation modification of PTFE leads to an increase in the interplanar spacings, the degree of crystallinity and the volume of the unit cell, as well as to a decrease in the size of crystals and the X-ray density of the crystalline phase in comparison with the initial polymer. It is assumed that the previously-established effect of improving the deformation-strength and tribological properties of the TRM-PTFE can be due not only to the radiation cross-linking of polymer chains but also to the disappearance of the pore system and to the ordering of the crystalline phase of PTFE.
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Zuo Z, Liang L, Bao Q, Yan P, Jin X, Yang Y. Molecular Dynamics Calculation on the Adhesive Interaction Between the Polytetrafluoroethylene Transfer Film and Iron Surface. Front Chem 2021; 9:740447. [PMID: 34631663 PMCID: PMC8495123 DOI: 10.3389/fchem.2021.740447] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Accepted: 09/09/2021] [Indexed: 11/13/2022] Open
Abstract
During the friction process, the polytetrafluoroethylene (PTFE) adhered on the counterpart surface was known as the PTFE transfer film, which was fundamental to the lubricating performance of the PTFE. However, the adhesive interaction between the iron surface and the adhered PTFE transfer film is still unclear. In present study, molecular dynamics simulations were used to reveal the adhesive interaction between the iron surface and PTFE transfer film. Based on the atomic trajectories obtained through the molecular dynamics, the interaction energy, concentration profile, radial distribution function, and mean square displacement were calculated to analyze the structure of the interface. The negative values of the interaction energy demonstrated the adhesive interaction between the PTFE transfer film and Fe surfaces, resulting in the accumulation of the PTFE transfer film on the Fe surface. Among the (100) (110), and (111) surfaces of α-Fe (110) surface owns the strongest adhesive interaction with the PTFE transfer film. Compared with the original PTFE molecule, the chain broken PTFE, hydroxyl substituted PTFE, and carbonyl substituted PTFE exhibited stronger adhesive interaction with Fe surface. The adhesive interaction between the PTFE transfer film and Fe surfaces was mainly originated from the Fe atoms and the F atoms of the adsorbate PTFE transfer film, which was governed by the van der Waals force. The bonding distance between the Fe atom and the F atom of the adsorbate PTFE transfer film is around 2.8 Å. Moreover, the chain broken of PTFE molecule and the rise of temperature can remarkably increase the mobility of polymer chains in the interface system.
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Affiliation(s)
- Zhen Zuo
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China
| | - Lifen Liang
- Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing, Yanshan University, Qinhuangdao, China.,College of Mechanical Engineering, Yanshan University, Qinhuangdao, China
| | - Qianqian Bao
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China
| | - Pengtao Yan
- School of Physics and Electronic Engineering, Xingtai University, Xingtai, China
| | - Xin Jin
- School of Mechanical Engineering, Beijing Institute of Technology, Beijing, China
| | - Yulin Yang
- Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing, Yanshan University, Qinhuangdao, China.,College of Mechanical Engineering, Yanshan University, Qinhuangdao, China
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Pfaff AS, Bumpers AP, Swenson DT, Ange BL, Wikesjö UME, Johnson TM. Overlay Analysis of Cone-Beam Computed Tomography Volumes Acquired before and after Horizontal Alveolar Ridge Augmentation. Med J (Ft Sam Houst Tex) 2021:40-49. [PMID: 34714921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
OBJECTIVE The objective of this study was to illustrate the efficacy of a novel imaging analysis technology to capture horizontal and vertical dimensional changes following horizontal alveolar ridge augmentation (HRA). METHODS Cone-beam computed tomography (CBCT) volumes from 65 HRA sites in 57 patients were available for evaluation, employing a three-dimensional analysis software to overlay preoperative and post-augmentation CBCT volumes. Horizontal and vertical alveolar ridge dimensional (HRD/VRD) changes were recorded considering a panel of patient-, site-, and procedure-related explanatory variables. RESULTS VRD changes ranged from -2.9 to 3.0 mm, more than half anterior sites losing alveolar ridge height. Mean HRD increase at the 3- and 5-mm levels apical to the alveolar crest amounted to 2.3±1.6 and 2.4±1.3 mm, respectively, membrane fixation and non-resorbable membrane use associated with significantly greater gains. CONCLUSIONS To date, studies reporting dimensional changes following HRA predominantly rely on serial in situ orofacial caliper recordings omitting vertical alterations. The protocol employed in this study allows simultaneous HRD and VRD evaluations and assures baseline and post-augmentation recordings are made at the same alveolar ridge position. Compared with in situ recording, CBCT overlay analysis may achieve a more complete characterization of dimensional changes following HRA.
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Affiliation(s)
- Aaron S Pfaff
- Resident, Department of Periodontics, Army Postgraduate Dental School, Uniformed Services University of the Health Sciences, Fort Gordon, GA
| | - April P Bumpers
- Resident, Department of Periodontics, Army Postgraduate Dental School, Uniformed Services University of the Health Sciences, Fort Gordon, GA
| | - Dane T Swenson
- Chief of Periodontics, US Army Dental Health Activity, Fort Bliss, TX
| | - Brittany L Ange
- Assistant Professor, Department of Population Health Sciences Biostatistics and Data Science Division, Medical College of Georgia, Augusta University, Augusta, GA
| | - Ulf M E Wikesjö
- Professor, Department of Periodontics, Army Postgraduate Dental School, Uniformed Services University of the Health Sciences, Fort Gordon, GA; and Director of the Laboratory for Applied Periodontal and Craniofacial Research, Adams School of Dentistry, University of North Carolina, Chapel Hill, NC
| | - Thomas M Johnson
- Professor, Department of Periodontics, Army Postgraduate Dental School, Uniformed Services University of the Health Sciences, Fort Gordon, GA
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Seibel P, Johnson T. Targeted Alveolar Ridge Augmentation for Patient-Centered Dental Implant Site Development. Med J (Ft Sam Houst Tex) 2021:50-54. [PMID: 34714922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
INTRODUCTION Guided bone regeneration (GBR) is the most commonly utilized procedure for augmenting deficient alveolar ridges in support of dental implant placement. In a GBR procedure, barrier membrane dimensions, bone graft volume, and surgical complexity may influence the risk of postsurgical morbidity. CASE PRESENTATION A 25-year-old female in good general health received GBR at two mandibular first molar sites exhibiting horizontal ridge deficiency. High-density polytetrafluoroethylene membranes were intentionally limited in size, and small-volume freeze-dried bone allografts were applied only where clinically beneficial for implant site development. Treatment resulted in clinically favorable ridge augmentation with no appreciable swelling and minimal postoperative discomfort. CONCLUSION At dental implant sites exhibiting modest alveolar ridge deficiency, limiting GBR barrier membrane dimensions and bone graft volumes may enhance patient-centered outcomes while accomplishing clinical goals.
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Affiliation(s)
- Paul Seibel
- Periodontist with the US Army Dental Health Activity, Carius Dental Clinic, Camp Humphreys, Korea
| | - Thomas Johnson
- Professor, Department of Periodontics, Army Postgraduate Dental School, Uniformed Services University of the Health Sciences, Fort Gordon, GA
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Panin SV, Luo J, Buslovich DG, Alexenko VO, Kornienko LA, Bochkareva SA, Byakov AV. Experimental-FEM Study on Effect of Tribological Load Conditions on Wear Resistance of Three-Component High-Strength Solid-Lubricant PI-Based Composites. Polymers (Basel) 2021; 13:2837. [PMID: 34451375 DOI: 10.3390/polym13162837] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 08/18/2021] [Accepted: 08/20/2021] [Indexed: 11/17/2022] Open
Abstract
The structure, mechanical and tribological properties of the polyimide-based composites reinforced with chopped carbon fibers (CCF) and loaded with solid-lubricant commercially available fillers of various natures were investigated. The metal- and ceramic counterparts were employed for tribological testing. Micron sized powders of PTFE, colloidal graphite and molybdenum disulfide were used for solid lubrication. It was shown that elastic modulus was enhanced by up to 2.5 times, while ultimate tensile strength was increased by up 1.5 times. The scheme and tribological loading conditions exerted the great effect on wear resistance of the composites. In the tribological tests by the ‘pin-on-disk’ scheme, wear rate decreased down to ~290 times for the metal-polymer tribological contact and to ~285 times for the ceramic-polymer one (compared to those for neat PI). In the tribological tests against the rougher counterpart (Ra~0.2 μm, the ‘block-on-ring’ scheme) three-component composites with both graphite and MoS2 exhibited high wear resistance. Under the “block-on-ring” scheme, the possibility of the transfer film formation was minimized, since the large-area counterpart slid against the ‘non-renewable’ surface of the polymer composite (at a ‘shortage’ of solid lubricant particles). On the other hand, graphite and MoS2 particles served as reinforcing inclusions. Finally, numerical simulation of the tribological test according to the ‘block-on-ring’ scheme was carried out. Within the framework of the implemented model, the counterpart roughness level exerted the significantly greater effect on wear rate in contrast to the porosity.
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Stojalowski PDS, Fairfoull J. Comparison of Reflective Properties of Materials Exposed to Ultraviolet-C Radiation. J Res Natl Inst Stand Technol 2021; 126:126017. [PMID: 38469450 PMCID: PMC10856222 DOI: 10.6028/jres.126.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Accepted: 03/28/2021] [Indexed: 03/13/2024]
Abstract
The reflectivity of material lining the inside of a disinfection chamber can have a dramatic effect on the ultraviolet-C (UV-C) radiation dose received across all sides of a contaminated object. Because minimum UV-C dosages are required to reliably inactivate microorganisms, it is crucial for the disinfection chamber to have either multiple UV-C sources or a highly reflective internal surface. This article describes an experimental comparison of four different materials, polytetrafluoroethylene (PTFE), acrylonitrile butadiene styrene, silver gloss self-adhesive aluminum, and Rosco matte black Cinefoil, to determine their efficacy as UV-C reflectors by using a custom-designed testing apparatus utilizing a UV-C radiation-emitting diode alongside photochromic UV-C indicators, allowing for a full 360° analysis of a target object and its received UV-C dose. Results determined that UV-C radiation received at the photochromic indicators varied greatly among the chosen materials, with PTFE providing the most uniform levels of radiation across all sides of the test object.
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Grewal MS, Abe H, Matsuo Y, Yabu H. Aqueous dispersion and tuning surface charges of polytetrafluoroethylene particles by bioinspired polydopamine-polyethyleneimine coating via one-step method. R Soc Open Sci 2021; 8:210582. [PMID: 34386261 PMCID: PMC8334825 DOI: 10.1098/rsos.210582] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 06/10/2021] [Indexed: 05/12/2023]
Abstract
We propose a surface modification of poorly dispersive polytetrafluoroethylene (PTFE) particles via bioinspired polydopamine-polyethyleneimine (PDA-PEI) which conferred PTFE particles a uniform dispersion in aqueous medium. With increasing dopamine concentration in the reaction solution, dispersity of PTFE particles improved and the surface charges of particles changed from negative to positive due to an increase of surface coverage of PDA-PEI layers. Simplicity of the method here outlines an attractive route for surface modification of inert surfaces useful for large-scale applications.
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Affiliation(s)
- Manjit Singh Grewal
- WPI-Advanced Institute of Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
| | - Hiroya Abe
- Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
| | - Yasutaka Matsuo
- Research Institute for Electronic Science (RIES), Hokkaido University, N21W10, Kita-Ku, Sapporo 001-0021, Japan
| | - Hiroshi Yabu
- WPI-Advanced Institute of Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Sendai 980-8577, Japan
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da Rocha LF, Pippi B, Joaquim AR, de Andrade SF, Fuentefria AM. 8-hydroxyquinoline-5-(N-4-chlorophenyl) sulfonamide and fluconazole combination as a preventive strategy for Candida biofilm in haemodialysis devices. J Med Microbiol 2021; 70. [PMID: 34259620 DOI: 10.1099/jmm.0.001377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Introduction. The presence of Candida biofilms in medical devices is a concerning and important clinical issue for haemodialysis patients who require constant use of prosthetic fistulae and catheters.Hypothesis/Gap Statement. This prolonged use increases the risk of candidaemia due to biofilm formation. PH151 and clioquinol are 8-hydroxyquinoline derivatives that have been studied by our group and showed interesting anti-Candida activity.Aim. This study evaluated the biofilm formation capacity of Candida species on polytetrafluoroethylene (PTFE) and polyurethane (PUR) and investigated the synergistic effects between the compounds PH151 and clioquinol and fluconazole, amphotericin B and caspofungin against biofilm cells removed from those materials. Further, the synergistic combination was evaluated in terms of preventing biofilm formation on PTFE and PUR discs.Methodology. Susceptibility testing was performed for planktonic and biofilm cells using the broth microdilution method. The checkerboard method and the time-kill assay were used to evaluate the interactions between antifungal agents. Antibiofilm activity on PTFE and PUR materials was assessed to quantify the prevention of biofilm formation.Results. Candida albicans, Candida glabrata and Candida tropicalis showed ability to form biofilms on both materials. By contrast, Candida parapsilosis did not demonstrate this ability. Synergistic interaction was observed when PH151 was combined with fluconazole in 77.8 % of isolates and this treatment was shown to be concentration- and time-dependent. On the other hand, indifferent interactions were predominantly observed with the other combinations. A reduction in biofilm formation on PUR material of more than 50 % was observed when using PH151 combined with fluconazole.Conclusion. PH151 demonstrated potential as a local treatment for use in a combination therapy approach against Candida biofilm formation on haemodialysis devices.
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Affiliation(s)
- Letícia Fernandes da Rocha
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Laboratório de Micologia Aplicada, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Bruna Pippi
- Laboratório de Micologia Aplicada, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Angélica Rocha Joaquim
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Saulo Fernandes de Andrade
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Programa de Pós-Graduação em Microbiologia Agrícola e do Ambiente, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Alexandre Meneghello Fuentefria
- Programa de Pós-Graduação em Ciências Farmacêuticas, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
- Programa de Pós-Graduação em Microbiologia Agrícola e do Ambiente, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
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Rodríguez M, Gómez-Gil V, Pérez-Köhler B, Pascual G, Bellón JM. Polymer Hernia Repair Materials: Adapting to Patient Needs and Surgical Techniques. Materials (Basel) 2021; 14:ma14112790. [PMID: 34073902 PMCID: PMC8197346 DOI: 10.3390/ma14112790] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 05/14/2021] [Accepted: 05/20/2021] [Indexed: 12/03/2022]
Abstract
Biomaterials and their applications are perhaps among the most dynamic areas of research within the field of biomedicine. Any advance in this topic translates to an improved quality of life for recipient patients. One application of a biomaterial is the repair of an abdominal wall defect whether congenital or acquired. In the great majority of cases requiring surgery, the defect takes the form of a hernia. Over the past few years, biomaterials designed with this purpose in mind have been gradually evolving in parallel with new developments in the different surgical techniques. In consequence, the classic polymer prosthetic materials have been the starting point for structural modifications or new prototypes that have always strived to accommodate patients’ needs. This evolving process has pursued both improvements in the wound repair process depending on the implant interface in the host and in the material’s mechanical properties at the repair site. This last factor is important considering that this site—the abdominal wall—is a dynamic structure subjected to considerable mechanical demands. This review aims to provide a narrative overview of the different biomaterials that have been gradually introduced over the years, along with their modifications as new surgical techniques have unfolded.
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Affiliation(s)
- Marta Rodríguez
- Departamento de Cirugía, Ciencias Médicas y Sociales, Facultad de Medicina y Ciencias de la Salud, Universidad de Alcalá, Alcalá de Henares, 28805 Madrid, Spain; (M.R.); (V.G.-G.)
- Biomedical Networking Research Centre of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, España; (B.P.-K.); (G.P.)
- Ramón y Cajal Health Research Institute (IRYCIS), Colmenar Viejo, 28034 Madrid, Spain
| | - Verónica Gómez-Gil
- Departamento de Cirugía, Ciencias Médicas y Sociales, Facultad de Medicina y Ciencias de la Salud, Universidad de Alcalá, Alcalá de Henares, 28805 Madrid, Spain; (M.R.); (V.G.-G.)
- Biomedical Networking Research Centre of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, España; (B.P.-K.); (G.P.)
| | - Bárbara Pérez-Köhler
- Biomedical Networking Research Centre of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, España; (B.P.-K.); (G.P.)
- Ramón y Cajal Health Research Institute (IRYCIS), Colmenar Viejo, 28034 Madrid, Spain
- Departamento de Medicina y Especialidades Médicas, Facultad de Medicina y Ciencias de la Salud, Universidad de Alcalá, Alcalá de Henares, 28805 Madrid, Spain
| | - Gemma Pascual
- Biomedical Networking Research Centre of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, España; (B.P.-K.); (G.P.)
- Ramón y Cajal Health Research Institute (IRYCIS), Colmenar Viejo, 28034 Madrid, Spain
- Departamento de Medicina y Especialidades Médicas, Facultad de Medicina y Ciencias de la Salud, Universidad de Alcalá, Alcalá de Henares, 28805 Madrid, Spain
| | - Juan Manuel Bellón
- Departamento de Cirugía, Ciencias Médicas y Sociales, Facultad de Medicina y Ciencias de la Salud, Universidad de Alcalá, Alcalá de Henares, 28805 Madrid, Spain; (M.R.); (V.G.-G.)
- Biomedical Networking Research Centre of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, España; (B.P.-K.); (G.P.)
- Ramón y Cajal Health Research Institute (IRYCIS), Colmenar Viejo, 28034 Madrid, Spain
- Correspondence:
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