1
|
Wang X, Chen S, Zhang K, Huang L, Shen H, Chen Z, Rong C, Wang G, Jiang Z. A Polytetrafluoroethylene-Based Solvent-Free Procedure for the Manufacturing of Lithium-Ion Batteries. Materials (Basel) 2023; 16:7232. [PMID: 38005162 PMCID: PMC10673244 DOI: 10.3390/ma16227232] [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: 10/20/2023] [Revised: 11/13/2023] [Accepted: 11/16/2023] [Indexed: 11/26/2023]
Abstract
Lithium-ion batteries (LIBs) have recently become popular for energy storage due to their high energy density, storage capacity, and long-term cycle life. Although binders make up only a small proportion of LIBs, they have become the key to promoting the transformation of the battery preparation process. Along with the development of binders, the battery manufacturing process has evolved from the conventional slurry-casting (SC) process to a more attractive solvent-free (SF) method. Compared with traditional LIBs manufacturing method, the SF method could dramatically reduce and increase the energy density due to the reduced preparation steps and enhanced electrode loading. Polytetrafluoroethylene (PTFE), as a typical binder, has played an important role in fabricating high-performance LIBs, particularly in regards to the SF technique. In this paper, the development history and application status of PTFE binder was introduced, and then its contributions and the inherent problems involved in the SF process were described and analyzed. Finally, the viewpoints concerning the future trends for PTFE-based SF manufacturing methods were also discussed. We hope this work can inspire future research concerning high-quality SF binders and assist in promoting the evolution of the SF manufacturing technology in regards to LIBs.
Collapse
Affiliation(s)
- Xuehan Wang
- Key Laboratory of High-Performance Plastics, Ministry of Education, National and Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymers, College of Chemistry, Jilin University, Changchun 130012, China; (X.W.); (K.Z.); (H.S.); (G.W.); (Z.J.)
| | - Shuli Chen
- National Key Laboratory of Advanced Vehicle Integration and Control, China FAW Group Co., Ltd., Changchun 130013, China; (S.C.); (L.H.)
| | - Kaiqi Zhang
- Key Laboratory of High-Performance Plastics, Ministry of Education, National and Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymers, College of Chemistry, Jilin University, Changchun 130012, China; (X.W.); (K.Z.); (H.S.); (G.W.); (Z.J.)
| | - Licheng Huang
- National Key Laboratory of Advanced Vehicle Integration and Control, China FAW Group Co., Ltd., Changchun 130013, China; (S.C.); (L.H.)
| | - Huilin Shen
- Key Laboratory of High-Performance Plastics, Ministry of Education, National and Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymers, College of Chemistry, Jilin University, Changchun 130012, China; (X.W.); (K.Z.); (H.S.); (G.W.); (Z.J.)
| | - Zheng Chen
- Key Laboratory of High-Performance Plastics, Ministry of Education, National and Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymers, College of Chemistry, Jilin University, Changchun 130012, China; (X.W.); (K.Z.); (H.S.); (G.W.); (Z.J.)
| | - Changru Rong
- National Key Laboratory of Advanced Vehicle Integration and Control, China FAW Group Co., Ltd., Changchun 130013, China; (S.C.); (L.H.)
| | - Guibin Wang
- Key Laboratory of High-Performance Plastics, Ministry of Education, National and Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymers, College of Chemistry, Jilin University, Changchun 130012, China; (X.W.); (K.Z.); (H.S.); (G.W.); (Z.J.)
| | - Zhenhua Jiang
- Key Laboratory of High-Performance Plastics, Ministry of Education, National and Local Joint Engineering Laboratory for Synthesis Technology of High-Performance Polymers, College of Chemistry, Jilin University, Changchun 130012, China; (X.W.); (K.Z.); (H.S.); (G.W.); (Z.J.)
| |
Collapse
|
2
|
Olariu MA, Herrero R, Astanei DG, Jofré L, Morentin J, Filip TA, Burlica R. Improving Printability of Polytetrafluoroethylene (PTFE) with the Help of Plasma Pre-Treatment. Polymers (Basel) 2023; 15:3348. [PMID: 37631405 PMCID: PMC10458421 DOI: 10.3390/polym15163348] [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: 07/14/2023] [Revised: 08/04/2023] [Accepted: 08/07/2023] [Indexed: 08/27/2023] Open
Abstract
Polytetrafluoroethylene (PTFE) is a potential candidate for the fabrication of flexible electronics devices and electronics with applications in various extreme environments, mainly due to its outstanding chemical and physical properties. However, to date, the utilization of PTFE in printing trials has been limited due to the material's low surface tension and wettability, which do not ensure good adhesion of the printing ink at the level of the substrate. Within this paper, successful printing of PTFE is realized after pre-treating the surface of the substrate with the help of dielectric barrier discharge non-thermal plasma. The efficiency of the pre-treatment is demonstrated with respect to both silver- and carbon-based inks that are commercially available, and finally, the long-lasting pre-treatment effect is demonstrated for periods of time spanning from minutes to days. The experimental results are practically paving the way toward large-scale utilization of PTFE as substrate in fabricating printed electronics in harsh working environments. After 3 s of plasma treatment of the foil, the WCA decreased from approximately 103° to approximately 70°. The resolution of the printed lines of carbon ink was not time dependent and was unmodified, even if the printing was realized within 1 min from the time of applying the pre-treatment or 10 days later. The evaluation of the surface tension (σ) measured with Arcotest Ink Pink showed an increase in σ up to 40 < σ < 42 mN/m for treated Teflon foil and from σ < 30 mN/m corresponding to the untreated substrate. The difference in resolution was distinguishable when increasing the width of the printed lines from 500 μm to 750 μm, but when increasing the width from 750 μm to 1000 μm, the difference was minimal.
Collapse
Affiliation(s)
- Marius Andrei Olariu
- Faculty of Electrical Engineering, “Gheorghe Asachi” Technical University of Iasi, 700050 Iasi, Romania; (M.A.O.); (T.A.F.)
| | - Rakel Herrero
- Technological Center of Mobility and Mechatronics (NAITEC), 31200 Estella-Lizarra, Spain; (R.H.); (L.J.); (J.M.)
| | - Dragoș George Astanei
- Faculty of Electrical Engineering, “Gheorghe Asachi” Technical University of Iasi, 700050 Iasi, Romania; (M.A.O.); (T.A.F.)
| | - Lisandro Jofré
- Technological Center of Mobility and Mechatronics (NAITEC), 31200 Estella-Lizarra, Spain; (R.H.); (L.J.); (J.M.)
| | - Javier Morentin
- Technological Center of Mobility and Mechatronics (NAITEC), 31200 Estella-Lizarra, Spain; (R.H.); (L.J.); (J.M.)
| | - Tudor Alexandru Filip
- Faculty of Electrical Engineering, “Gheorghe Asachi” Technical University of Iasi, 700050 Iasi, Romania; (M.A.O.); (T.A.F.)
| | - Radu Burlica
- Faculty of Electrical Engineering, “Gheorghe Asachi” Technical University of Iasi, 700050 Iasi, Romania; (M.A.O.); (T.A.F.)
| |
Collapse
|
3
|
Vidakis N, Petousis M, Moutsopoulou A, Papadakis V, Spiridaki M, Mountakis N, Charou C, Tsikritzis D, Maravelakis E. Nanocomposites with Optimized Polytetrafluoroethylene Content as a Reinforcement Agent in PA12 and PLA for Material Extrusion Additive Manufacturing. Polymers (Basel) 2023; 15:2786. [PMID: 37447432 DOI: 10.3390/polym15132786] [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: 05/29/2023] [Revised: 06/12/2023] [Accepted: 06/21/2023] [Indexed: 07/15/2023] Open
Abstract
Herein, polytetrafluoroethylene (PTFE) is evaluated as a reinforcement agent in material extrusion (MEX) additive manufacturing (AM), aiming to develop nanocomposites with enhanced mechanical performance. Loadings up to 4.0 wt.% were introduced as fillers of polylactic acid (PLA) and polyamide 12 (PA12) matrices. Filaments for MEX AM were prepared to produce corresponding 3D-printed samples. For the thorough characterization of the nanocomposites, a series of standardized mechanical tests were followed, along with AFM, TGA, Raman spectroscopy, EDS, and SEM analyses. The results showed an improved mechanical response for filler concentrations between 2.0 and 3.0 wt.%. The enhancement for the PLA/PTFE 2.0 wt.% in the tensile strength reached 21.1% and the modulus of elasticity 25.5%; for the PA12/PTFE 3.0 wt.%, 34.1%, and 41.7%, respectively. For PLA/PTFE 2.0 wt.%, the enhancement in the flexural strength reached 57.6% and the modulus of elasticity 25.5%; for the PA12/PTFE 3.0 wt.%, 14.7%, and 17.2%, respectively. This research enables the ability to deploy PTFE as a reinforcement agent in the PA12 and PLA thermoplastic engineering polymers in the MEX AM process, expanding the potential applications.
Collapse
Affiliation(s)
- Nectarios Vidakis
- Department of Mechanical Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece
| | - Markos Petousis
- Department of Mechanical Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece
| | - Amalia Moutsopoulou
- Department of Mechanical Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece
| | - Vassilis Papadakis
- Department of Industrial Design and Production Engineering, University of West Attica, 12244 Athens, Greece
- Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, N. Plastira 100m, 70013 Heraklion, Greece
| | - Mariza Spiridaki
- Department of Mechanical Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece
| | - Nikolaos Mountakis
- Department of Mechanical Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece
| | - Chrysa Charou
- Department of Mechanical Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece
| | - Dimitris Tsikritzis
- Department of Electrical & Computer Engineering, Hellenic Mediterranean University, 71410 Heraklion, Greece
| | - Emmanuel Maravelakis
- Department of Electronic Engineering, Hellenic Mediterranean University (HMU), 73133 Chania, Greece
| |
Collapse
|
4
|
Ren Y, Fan L, Alkildani S, Liu L, Emmert S, Najman S, Rimashevskiy D, Schnettler R, Jung O, Xiong X, Barbeck M. Barrier Membranes for Guided Bone Regeneration (GBR): A Focus on Recent Advances in Collagen Membranes. Int J Mol Sci 2022; 23:ijms232314987. [PMID: 36499315 PMCID: PMC9735671 DOI: 10.3390/ijms232314987] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [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: 11/03/2022] [Revised: 11/25/2022] [Accepted: 11/25/2022] [Indexed: 12/02/2022] Open
Abstract
Guided bone regeneration (GBR) has become a clinically standard modality for the treatment of localized jawbone defects. Barrier membranes play an important role in this process by preventing soft tissue invasion outgoing from the mucosa and creating an underlying space to support bone growth. Different membrane types provide different biological mechanisms due to their different origins, preparation methods and structures. Among them, collagen membranes have attracted great interest due to their excellent biological properties and desired bone regeneration results to non-absorbable membranes even without a second surgery for removal. This work provides a comparative summary of common barrier membranes used in GBR, focusing on recent advances in collagen membranes and their biological mechanisms. In conclusion, the review article highlights the biological and regenerative properties of currently available barrier membranes with a particular focus on bioresorbable collagen-based materials. In addition, the advantages and disadvantages of these biomaterials are highlighted, and possible improvements for future material developments are summarized.
Collapse
Affiliation(s)
- Yanru Ren
- Clinic and Policlinic for Dermatology and Venereology, University Medical Center Rostock, 18057 Rostock, Germany
- BerlinAnalytix GmbH, 12109 Berlin, Germany
| | - Lu Fan
- NMI Natural and Medical Sciences Institute, University of Tübingen, 72770 Reutlingen, Germany
| | | | - Luo Liu
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100013, China
| | - Steffen Emmert
- Clinic and Policlinic for Dermatology and Venereology, University Medical Center Rostock, 18057 Rostock, Germany
| | - Stevo Najman
- Scientific Research Center for Biomedicine, Department for Cell and Tissue Engineering, Faculty of Medicine, University of Niš, 18000 Niš, Serbia
- Department of Biology and Human Genetics, Faculty of Medicine, University of Niš, 18000 Niš, Serbia
| | - Denis Rimashevskiy
- Department of Traumatology and Orthopedics, Peoples’ Friendship University of Russia, 117198 Moscow, Russia
| | - Reinhard Schnettler
- University Medical Centre, Justus Liebig University of Giessen, 35390 Giessen, Germany
| | - Ole Jung
- Clinic and Policlinic for Dermatology and Venereology, University Medical Center Rostock, 18057 Rostock, Germany
| | - Xin Xiong
- NMI Natural and Medical Sciences Institute, University of Tübingen, 72770 Reutlingen, Germany
| | - Mike Barbeck
- Clinic and Policlinic for Dermatology and Venereology, University Medical Center Rostock, 18057 Rostock, Germany
- BerlinAnalytix GmbH, 12109 Berlin, Germany
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100013, China
- Correspondence: ; Tel.: +49-(0)-176-81022467
| |
Collapse
|
5
|
Burmistrov DE, Serov DA, Simakin AV, Baimler IV, Uvarov OV, Gudkov SV. A Polytetrafluoroethylene (PTFE) and Nano-Al2O3 Based Composite Coating with a Bacteriostatic Effect against E. coli and Low Cytotoxicity. Polymers (Basel) 2022; 14:4764. [PMID: 36365757 PMCID: PMC9653981 DOI: 10.3390/polym14214764] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 10/31/2022] [Accepted: 11/02/2022] [Indexed: 08/13/2023] Open
Abstract
The problem of bacterial contamination through surfaces is important for the food industry. In this regard, there is a growing interest in new coatings based on nanoparticles that can provide a long-term antibacterial effect. Aluminum oxide nanoparticles are a good candidate for such coatings due to their availability and good biocompatibility. In this study, a coating containing aluminum oxide nanoparticles was produced using polytetrafluoroethylene as a polymer matrix-a polymer that exhibits excellent mechanical and physicochemical properties and it is not toxic. The obtained coatings based on "liquid Teflon" containing various concentrations of nanoparticles (0.001-0.1 wt%) prevented the bacterial growth, and they did not exhibit a cytotoxicity on animal cells in vitro. Such coatings are designed not only to provide an antibacterial surface effect, but also to eliminate micro damages on surfaces that inevitably occur in the process of food production.
Collapse
Affiliation(s)
| | | | | | | | | | - Sergey V. Gudkov
- Prokhorov General Physics Institute of the Russian Academy of Sciences, 38 Vavilova St., 119991 Moscow, Russia
| |
Collapse
|
6
|
Begić G, Petković Didović M, Lučić Blagojević S, Jelovica Badovinac I, Žigon J, Perčić M, Cvijanović Peloza O, Gobin I. Adhesion of Oral Bacteria to Commercial d-PTFE Membranes: Polymer Microstructure Makes a Difference. Int J Mol Sci 2022; 23:2983. [PMID: 35328404 DOI: 10.3390/ijms23062983] [Citation(s) in RCA: 2] [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: 02/17/2022] [Revised: 03/06/2022] [Accepted: 03/08/2022] [Indexed: 12/04/2022] Open
Abstract
Bacterial contamination of the membranes used during guided bone regeneration directly influences the outcome of this procedure. In this study, we analyzed the early stages of bacterial adhesion on two commercial dense polytetrafluoroethylene (d-PTFE) membranes in order to identify microstructural features that led to different adhesion strengths. The microstructure was investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and Fourier transform infrared (FTIR). The surface properties were analyzed by atomic force microscopy (AFM), scanning electron microscopy (SEM), and surface free energy (SFE) measurements. Bacterial properties were determined using the microbial adhesion to solvents (MATS) assay, and bacterial surface free energy (SFE) was measured spectrophotometrically. The adhesion of four species of oral bacteria (Streptococcus mutans, Streptococcus oralis, Aggregatibacter actinomycetemcomitas, and Veilonella parvula) was studied on surfaces with or without the artificial saliva coating. The results indicated that the degree of crystallinity (78.6% vs. 34.2%, with average crystallite size 50.54 nm vs. 32.86 nm) is the principal feature promoting the adhesion strength, through lower nanoscale roughness and possibly higher surface stiffness. The spherical crystallites (“warts”), observed on the surface of the highly crystalline sample, were also identified as a contributor. All bacterial species adhered better to a highly crystalline membrane (around 1 log10CFU/mL difference), both with and without artificial saliva coating. Our results show that the changes in polymer microstructure result in different antimicrobial properties even for chemically identical PTFE membranes.
Collapse
|
7
|
Wang H, Sun A, Qi X, Dong Y, Fan B. Experimental and Analytical Investigations on Tribological Properties of PTFE/AP Composites. Polymers (Basel) 2021; 13:4295. [PMID: 34960847 DOI: 10.3390/polym13244295] [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: 10/06/2021] [Revised: 11/25/2021] [Accepted: 12/02/2021] [Indexed: 11/24/2022] Open
Abstract
The tribological properties of polytetrafluoroethylene (PTFE)/AP (poly(para-phenyleneterephthalamide) (PPTA) pulp) composites under different test conditions (load: 2N, 10N; frequency: 1 Hz, 4 Hz; amplitude: 2 mm, 8 mm) were holistically evaluated. PTFE/AP composites with different AP mass ratios of 3%, 6%, and 12% as a skeleton support material were prepared. The coefficient of friction (COF) and wear rate were determined on a ball-on-disk tribometer. Furthermore, the morphology, element composition, and chemical structure of the transfer membrane were analyzed accordingly. The relationships between load, frequency, amplitude, and tribological properties were further investigated. According to the wear mechanism, AP enables effective improvement in the stiffness and wear resistance, which is also conducive to the formation of transfer films.
Collapse
|
8
|
Wei Z, Huang J, Chen W, Huang Q. Fabrication and Characterization of Flexible Capacitive Humidity Sensors Based on Graphene Oxide on Porous PTFE Substrates. Sensors (Basel) 2021; 21:5118. [PMID: 34372356 PMCID: PMC8348390 DOI: 10.3390/s21155118] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 07/24/2021] [Accepted: 07/27/2021] [Indexed: 11/16/2022]
Abstract
Porous polytetrafluoroethylene (PTFE) is physically flexible, thermally and chemically stable, relatively inexpensive, and commercially available. It is attractive for various flexible sensors. This paper has studied flexible capacitive humidity sensors fabricated on porous PTFE substrates. Graphene oxide (GO) was used as a sensing material, both hydrophobic and hydrophilic porous PTFE as the substrates, and interdigitated electrodes on the PTFE substrates were screen-printed. SEM and Raman spectrum were utilized to characterize GO and PTFE. An ethanol soak process is developed to increase the yield of the humidity sensors based on hydrophobic porous PTFE substrates. Static and dynamic properties of these sensors are tested and analyzed. It demonstrates that the flexible capacitive humidity sensors fabricated on the ethanol-treated hydrophobic PTFE exhibit high sensitivity, small hysteresis, and fast response/recovery time.
Collapse
Affiliation(s)
| | - Jianqiu Huang
- Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, China; (Z.W.); (W.C.)
| | | | - Qingan Huang
- Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 210096, China; (Z.W.); (W.C.)
| |
Collapse
|
9
|
Köhler R, Pohl C, Walschus U, Zippel R, Wilhelm L, Hoene A, Patrzyk M, Schlosser M. Association of systemic antibody response against polyethylene terephthalate with inflammatory serum cytokine profile following implantation of differently coated vascular prostheses in a rat animal model. J Biomed Mater Res A 2021; 110:52-63. [PMID: 34245083 DOI: 10.1002/jbm.a.37265] [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: 03/22/2021] [Revised: 06/23/2021] [Accepted: 06/29/2021] [Indexed: 11/09/2022]
Abstract
Experimental studies demonstrated antibodies against matrix and coating of polyester-based vascular prostheses. Thus, this study examined associations of these antibodies with serum cytokines (IL-2, IL-4, and IL-10) and local inflammatory reactions. Rats (n = 8/group) intramuscularly received prosthesis segments [PET-C, PET-G, and PET-A groups: polyethylene terephthalate (PET)-based prostheses coated with bovine collagen and gelatin or human serum albumin, respectively; uncoated polytetrafluoroethylene-based (PTFE) prosthesis], with sham-operated controls. Blood was drawn pre-operatively and weekly until day 22. Polymer-specific or coating-specific antibodies and cytokines were detected by enzyme immunoassays, inflammatory reactions were immunohistochemically evaluated on day 23. Polymer-specific antibodies were detected in all PET-groups using uncoated PET as antigenic target, but not for PTFE or controls, coating-specific antibodies only for PET-A. IL-10 was increased in all PET-groups and correlated with polymer-specific antibodies for PET-G and PET-A. IL-2 was increased for PET-A, but overall correlated with PET-specific antibodies. IL-4 remained unchanged in all groups. Intense local inflammatory reactions (ED1+ /ED2+ macrophages and T lymphocytes) were found within all PET-groups, but only minor for PTFE or controls. In conclusion, PET-specific antibodies were associated with increased IL-10 and along with concurrent coating-specific antibodies also with increased IL-2, indicating a specific T cell response. Thus, matrix and/or coating of polymeric vascular prostheses elicit distinct systemic immune reactions, probably influencing local inflammatory reactions.
Collapse
Affiliation(s)
- Ronny Köhler
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Christopher Pohl
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Uwe Walschus
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Roland Zippel
- Department of Surgery, Elbe-Elster Hospital, Herzberg, Germany
| | - Lutz Wilhelm
- Department of Surgery, Hospital Demmin, Demmin, Germany
| | - Andreas Hoene
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Maciej Patrzyk
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| | - Michael Schlosser
- Department of General Surgery, Visceral, Thoracic and Vascular Surgery, University Medical Center Greifswald, Greifswald, Germany
| |
Collapse
|
10
|
Samaeili A, Rahmani S, Hassanpour K, Meshksar A, Ansari I, Afsar-Aski S, Einollahi B, Pakravan M. A new glaucoma drainage implant with the use of Polytetrafluoroethylene (PTFE). A pilot study. Rom J Ophthalmol 2021; 65:150-156. [PMID: 34179580 PMCID: PMC8207869 DOI: 10.22336/rjo.2021.30] [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] [Indexed: 11/18/2022] Open
Abstract
Purpose: To investigate the implantation of Polytetrafluoroethylene (PTFE) as a glaucoma drainage device. Methods: This study has been done in two steps. First, the constructed implants have been used in 4 rabbits and the histopathologic response was evaluated. In the second step, the implants were used in the 6 eyes of 6 patients with end-stage glaucoma with uncontrolled IOP and poor visual acuity. The tube was made of two-layer of PTFE membrane measuring 8 * 6 mm with a thickness of 1.8 mm and a silicone tube. The rabbits and the human eyes underwent surgical implantation of the tube in the anterior chamber. The histopathologic evaluation was done using H&E staining. Visual acuity, intraocular pressure and the number of glaucoma medications were assessed before and after the surgery. Results: In the histopathologic evaluation, subconjunctival polarizing fibers of a synthetic mesh infiltrated by fibrovascular septa was seen. A granulomatous inflammatory reaction composed of histiocytes, lymphocytes, and multinucleated giant cells were seen around and between the synthetic bundles. The average age of patients was 63 ± 5.5 years. The mean IOP reached from 36.6 ± 5.7 mmHg at baseline to 16.2 ± 8.9 mmHg at the final follow-up. Patients were followed for an average of 6.6 ± 4.5 months. One patient found hypotony refractory to medical and surgical treatment, which led to implant removal. One patient had uncontrolled IOP and finally led to phthisis bulbi following slow CPC. The remaining four eyes did well during the follow-up. Conclusion: The use of PTFE as a new polymer in tube shunt construction was reported. Larger studies, modification of the PTFE membranes like changing the porosity amount, and size of PTFE membranes might result in different conclusions.
Collapse
Affiliation(s)
- Azadeh Samaeili
- Department of Ophthalmology, Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Saeed Rahmani
- Department of Optometry, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Kiana Hassanpour
- Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Department of Ophthalmology, Imam Hossein Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Aidin Meshksar
- Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Poostchi Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Iman Ansari
- Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Sasha Afsar-Aski
- Ophthalmic Research Center, Research Institute for Ophthalmology and Vision Science, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Bahram Einollahi
- Department of Ophthalmology, Labbafinejad Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Pakravan
- Department of Ophthalmology, Labbafinejad Medical Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Ophthalmic Epidemiology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| |
Collapse
|
11
|
Georgescu C, Deleanu L, Chiper Titire L, Ceoromila AC. Tribology of Polymer Blends PBT + PTFE. Materials (Basel) 2021; 14:ma14040997. [PMID: 33672560 PMCID: PMC7924065 DOI: 10.3390/ma14040997] [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] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 02/13/2021] [Accepted: 02/16/2021] [Indexed: 11/30/2022]
Abstract
This paper presents results on tribological characteristics for polymer blends made of polybutylene terephthalate (PBT) and polytetrafluoroethylene (PTFE). This blend is relatively new in research as PBT has restricted processability because of its processing temperature near the degradation one. Tests were done block-on-ring tribotester, in dry regime, the variables being the PTFE concentration (0%, 5%, 10% and 15% wt) and the sliding regime parameters (load: 1, 2.5 and 5 N, the sliding speed: 0.25, 0.5 and 0.75 m/s, and the sliding distance: 2500, 5000 and 7500 m). Results are encouraging as PBT as neat polymer has very good tribological characteristics in terms of friction coefficient and wear rate. SEM investigation reveals a quite uniform dispersion of PTFE drops in the PBT matrix. Either considered a composite or a blend, the mixture PBT + 15% PTFE exhibits a very good tribological behavior, the resulting material gathering both stable and low friction coefficient and a linear wear rate lower than each component when tested under the same conditions.
Collapse
Affiliation(s)
- Constantin Georgescu
- Department of Mechanical Engineering, Faculty of Engineering, “Dunarea de Jos” University of Galati, 800008 Galati, Romania;
- Correspondence: (C.G.); (L.D.); Tel.: +40-743-105-835 (L.D.)
| | - Lorena Deleanu
- Department of Mechanical Engineering, Faculty of Engineering, “Dunarea de Jos” University of Galati, 800008 Galati, Romania;
- Correspondence: (C.G.); (L.D.); Tel.: +40-743-105-835 (L.D.)
| | - Larisa Chiper Titire
- Department of Mechanical Engineering, Faculty of Engineering, “Dunarea de Jos” University of Galati, 800008 Galati, Romania;
| | - Alina Cantaragiu Ceoromila
- Department of Applied Sciences, Cross-Border Faculty, “Dunarea de Jos” University of Galati, 800008 Galati, Romania;
| |
Collapse
|
12
|
Feng H, Yi Z, Yang R, Qin X, Shen S, Zeng W, Shui L, Zhou G, Zhang C. Designing Splicing Digital Microfluidics Chips Based on Polytetrafluoroethylene Membrane. Micromachines (Basel) 2020; 11:mi11121067. [PMID: 33266119 PMCID: PMC7760364 DOI: 10.3390/mi11121067] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [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: 11/11/2020] [Revised: 11/26/2020] [Accepted: 11/29/2020] [Indexed: 11/17/2022]
Abstract
As a laboratory-on-a-chip application tool, digital microfluidics (DMF) technology is widely used in DNA-based applications, clinical diagnosis, chemical synthesis, and other fields. Additional components (such as heaters, centrifuges, mixers, etc.) are required in practical applications on DMF devices. In this paper, a DMF chip interconnection method based on electrowetting-on-dielectric (EWOD) was proposed. An open modified slippery liquid-infused porous surface (SLIPS) membrane was used as the dielectric-hydrophobic layer material, which consisted of polytetrafluoroethylene (PTFE) membrane and silicone oil. Indium tin oxide (ITO) glass was used to manufacture the DMF chip. In order to test the relationship between the splicing gap and droplet moving, the effect of the different electrodes on/off time on the minimum driving voltage when the droplet crossed a splicing gap was investigated. Then, the effects of splicing gaps of different widths, splicing heights, and electrode misalignments were investigated, respectively. The experimental results showed that a driving voltage of 119 V was required for a droplet to cross a splicing gap width of 300 μm when the droplet volume was 10 μL and the electrode on/off time was 600 ms. At the same time, the droplet could climb a height difference of 150 μm with 145 V, and 141 V was required when the electrode misalignment was 1000 μm. Finally, the minimum voltage was not obviously changed, when the same volume droplet with different aqueous solutions crossed the splicing gap, and the droplet could cross different chip types. These splicing solutions show high potential for simultaneous detection of multiple components in human body fluids.
Collapse
Affiliation(s)
- Haoqiang Feng
- College of Electron and Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (H.F.); (W.Z.); (L.S.); (C.Z.)
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (R.Y.); (X.Q.); (S.S.); (G.Z.)
| | - Zichuan Yi
- College of Electron and Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (H.F.); (W.Z.); (L.S.); (C.Z.)
- Correspondence: ; Tel.: +86-0760-8831-4612
| | - Ruizhi Yang
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (R.Y.); (X.Q.); (S.S.); (G.Z.)
| | - Xiaofeng Qin
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (R.Y.); (X.Q.); (S.S.); (G.Z.)
| | - Shitao Shen
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (R.Y.); (X.Q.); (S.S.); (G.Z.)
| | - Wenjun Zeng
- College of Electron and Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (H.F.); (W.Z.); (L.S.); (C.Z.)
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (R.Y.); (X.Q.); (S.S.); (G.Z.)
| | - Lingling Shui
- College of Electron and Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (H.F.); (W.Z.); (L.S.); (C.Z.)
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (R.Y.); (X.Q.); (S.S.); (G.Z.)
| | - Guofu Zhou
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China; (R.Y.); (X.Q.); (S.S.); (G.Z.)
| | - Chongfu Zhang
- College of Electron and Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (H.F.); (W.Z.); (L.S.); (C.Z.)
| |
Collapse
|
13
|
Aturaliya R, Wang D, Xu Y, Lin YJ, Li Q, Turng LS. Expanded Polytetrafluoroethylene/Graphite Composites for Easy Water/Oil Separation. ACS Appl Mater Interfaces 2020; 12:38241-38248. [PMID: 32846495 DOI: 10.1021/acsami.0c11583] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Oil spills in the ocean greatly threaten local environments, marine creatures, and coastal economies. An automatic water/oil separation material system was proposed in this study, and a tubular geometry was chosen to demonstrate the water/oil separation efficiency and effectiveness. The water/oil separation tubes were made of expanded polytetrafluoroethylene (ePTFE) and graphite composites. The permeation pressures of water and oil through the tube walls were tuned by adjusting the ePTFE microstructure, which, in turn, depended on the degree of expansion and the graphite content. Fourier-transform infrared spectroscopy was performed to confirm the compositions of the ePTFE/graphite composites, and a scanning electron microscope was used to examine the microstructure and morphology of the expanded PTFE/graphite composite tubes. When a proper pressure was applied, which was higher than the oil's permeation pressure (3.0 kPa) but lower than the water's permeation pressure (57 kPa), the oil leaked out of the tube walls while the water went through the ePTFE/graphite tubes. As such, the water/oil mixture could be separated and collected in different containers or an outer tube. Due to this automatic separation, the whole process could be done continuously and conveniently, thus exhibiting great potential in the practical applications of oil spill and water separation/remediation.
Collapse
Affiliation(s)
- Ryan Aturaliya
- Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, Wisconsin 53715, United States
| | - Dongfang Wang
- School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, P. R. China
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Yiyang Xu
- Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, Wisconsin 53715, United States
- Polymer Engineering Center, Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Yu-Jyun Lin
- Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, Wisconsin 53715, United States
- Polymer Engineering Center, Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| | - Qian Li
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Lih-Sheng Turng
- Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, Wisconsin 53715, United States
- Polymer Engineering Center, Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
| |
Collapse
|
14
|
Ma L, Li X, Guo X, Jiang Y, Li X, Guo H, Zhang B, Xu Y, Wang X, Li Q. Promotion of Endothelial Cell Adhesion and Antithrombogenicity of Polytetrafluoroethylene by Chemical Grafting of Chondroitin Sulfate. ACS Appl Bio Mater 2020; 3:891-901. [PMID: 35019291 DOI: 10.1021/acsabm.9b00970] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [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: 12/24/2022]
Abstract
Polytetrafluoroethylene (PTFE) is one of the polymers extensively applied in biomedicine. However, the application of PTFE as a small-diameter vascular graft results in thrombosis and intimal hyperplasia because of the immune response. Therefore, improving the biocompatibility and anticoagulant properties of PTFE is a key to solving this problem. In this study, a hydroxyl group-rich surface was obtained by oxidizing a benzoin-reduced PTFE membrane. Then, chondroitin sulfate (CS), an anticoagulant, was grafted on the surface of the hydroxylated PTFE membrane using 3-aminopropyltriethoxysilane. The successful modification of the membrane in each step was demonstrated by Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Hydroxylation and the grafting of CS greatly increased the hydrophilicity and roughness of membrane samples. Moreover, the hydroxylated PTFE membrane enhanced the adhesion ability of endothelial cells, and the grafting of CS also promoted the proliferation of endothelial cells and decreased platelet adhesion. The results indicate that the PTFE membranes grafted with CS are able to facilitate rapid endothelialization and inhibit thrombus formation, which makes the proposed method outstanding for artificial blood vessel applications.
Collapse
Affiliation(s)
- Lei Ma
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, China.,School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Xuyan Li
- School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China.,School of Mechanics & Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Xin Guo
- School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China.,School of Mechanics & Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Yongchao Jiang
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, China.,School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - XiaoMeng Li
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, China.,School of Mechanics & Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Haiyang Guo
- School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China.,School of Mechanics & Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Bo Zhang
- School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China.,School of Mechanics & Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Yiyang Xu
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, China.,School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China.,Wisconsin Institute for Discovery, University of Wisconsin-Madison, Madison, Wisconsin 53715, United States
| | - Xiaofeng Wang
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, China.,School of Mechanics & Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Qian Li
- National Center for International Research of Micro-Nano Molding Technology, Zhengzhou University, Zhengzhou 450001, China.,School of Materials Science & Engineering, Zhengzhou University, Zhengzhou 450001, China.,School of Mechanics & Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
| |
Collapse
|
15
|
Chen TL, Huang CY, Xie YT, Chiang YY, Chen YM, Hsueh HY. Bioinspired Durable Superhydrophobic Surface from a Hierarchically Wrinkled Nanoporous Polymer. ACS Appl Mater Interfaces 2019; 11:40875-40885. [PMID: 31588736 DOI: 10.1021/acsami.9b14325] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Inspired by complex multifunctional leaves, in this study, we created robust hierarchically wrinkled nanoporous polytetrafluoroethene (PTFE) surfaces that exhibit superhydrophobic properties by combination of PTFE micellization and spontaneous surface wrinkling on a commercially available thermoretractable polystyrene (PS) sheet. A PTFE dispersion was coated onto the PS sheet, followed by thermal treatment to remove the surfactants surrounding the PTFE particles, and surface wrinkling was induced through a dynamic thermal contraction process. Thermally induced contraction from the PS sheet provided the driving force for developing and stabilizing micrometer-sized wrinkle formation, whereas the nanometer-sized PTFE particle aggregation formed a rigid nanoporous film, providing its intrinsic hydrophobic character. By combining the hierarchical interfacial structure and chemical composition, hierarchically wrinkled nanoporous PTFE surfaces were fabricated, which exhibited extremely high water repellence (water contact angle of ∼167°) and a water rolling-off angle lower than 5°. The wrinkled patterns could intimately bind the nanoporous PTFE layer through enhanced adhesion from their curved surface and viscous liquid surfactants, making these surfaces mechanically robust and offering potentially extendable alternatives with self-cleaning, antifouling, and drag-reducing properties.
Collapse
|
16
|
Zhao Q, An J, Wang S, Qiao Y, Liao C, Wang C, Wang X, Li N. Superhydrophobic Air-Breathing Cathode for Efficient Hydrogen Peroxide Generation through Two-Electron Pathway Oxygen Reduction Reaction. ACS Appl Mater Interfaces 2019; 11:35410-35419. [PMID: 31465198 DOI: 10.1021/acsami.9b09942] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Electrochemical catalysis of carbon-based material via two-electron pathway oxygen reduction reaction (ORR) offers great potential for in situ hydrogen peroxide (H2O2) production. In this work, we tuned catalyst mesostructure and hydrophilicity/hydrophobicity by adjusting polytetrafluoroethylene (PTFE) content in graphite/carbon black/PTFE hybrid catalyst layer (CL), aimed to improving the two-electron ORR activity for efficient H2O2 generation. As the only superhydrophobic CL with initiating contact angles of 141.11°, PTFE0.57 obtained the highest H2O2 yield of 3005 ± 58 mg L-1 h-1 (at 25 mA cm-2) and highest current efficiency (CE) of 84% (at 20 mA cm-2). Rotating ring disk electrode (RRDE) results demonstrated that less PTFE content in CLs results in less electrons transferred and better selectivity toward two-electron ORR. Though the highest H2 concentration (2 μmol L-1 at 25 mA cm-2) was monitored from PTFE0.57 which contained the lowest PTFE, the CE decreased inversely with increasing content of PTFE, which proved that the H2O2 decomposition reaction was the major side reaction. Higher PTFE content increased the hydrophilicity of CL for excessive H+ and insufficient O2 diffusion, which induced H2O2 decomposition into H2O. Simultaneously, the electroactive surface area of CLs decreased with higher PTFE content, from 0.0041 m2 g-1 of PTFE0.57 to 0.0019 m2 g-1 of PTFE4.56. Besides, higher PTFE content in CL leads to the increase of total impedance (from 14.5 Ω of PTFE0.57 to 18.3 Ω of PTFE4.56), which further hinders the electron transfer and ORR activity.
Collapse
Affiliation(s)
- Qian Zhao
- Tianjin Key Lab Indoor Air Environmental Quality Control, School of Environmental Science and Engineering , Tianjin University , No. 92 Weijin Road, Nankai District , Tianjin 300072 , China
| | - Jingkun An
- Tianjin Key Lab Indoor Air Environmental Quality Control, School of Environmental Science and Engineering , Tianjin University , No. 92 Weijin Road, Nankai District , Tianjin 300072 , China
| | - Shu Wang
- Tianjin Key Lab Indoor Air Environmental Quality Control, School of Environmental Science and Engineering , Tianjin University , No. 92 Weijin Road, Nankai District , Tianjin 300072 , China
| | - Yujie Qiao
- Tianjin Key Lab Indoor Air Environmental Quality Control, School of Environmental Science and Engineering , Tianjin University , No. 92 Weijin Road, Nankai District , Tianjin 300072 , China
| | - Chengmei Liao
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control , Nankai University , No. 38 Tongyan Road, Jinnan District , Tianjin 300350 , China
| | - Cong Wang
- Tianjin Key Lab Indoor Air Environmental Quality Control, School of Environmental Science and Engineering , Tianjin University , No. 92 Weijin Road, Nankai District , Tianjin 300072 , China
| | - Xin Wang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Environmental Remediation and Pollution Control , Nankai University , No. 38 Tongyan Road, Jinnan District , Tianjin 300350 , China
| | - Nan Li
- Tianjin Key Lab Indoor Air Environmental Quality Control, School of Environmental Science and Engineering , Tianjin University , No. 92 Weijin Road, Nankai District , Tianjin 300072 , China
| |
Collapse
|
17
|
Kwon HJ, Yeo J, Jang JE, Grigoropoulos CP, Yoo JH. Single Pass Laser Process for Super-Hydrophobic Flexible Surfaces with Micro/Nano Hierarchical Structures. Materials (Basel) 2018; 11:E1226. [PMID: 30018208 PMCID: PMC6073274 DOI: 10.3390/ma11071226] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [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: 06/25/2018] [Revised: 07/10/2018] [Accepted: 07/12/2018] [Indexed: 11/23/2022]
Abstract
Wetting has been studied in various fields: chemical industry, automobile manufacturing, food companies, and even life sciences. In these studies, super-hydrophobic surfaces have been achieved through complex steps and processes. To realize super-hydrophobicity, however, we demonstrated a simple and single pass laser process for the fabrication of micro/nano hierarchical structures on the flexible polytetrafluoroethylene (PTFE, Teflon) surface. The fabricated hierarchical structures helped increase the hydrophobicity by augmenting the surface roughness and promoting air-trapping. In addition, we employed a low-cost and high-throughput replication process producing numerous polydimethylsiloxane (PDMS) replicas from the laser-processed PTFE film. Thanks to the anti-adhesive characteristics of PTFE and the elasticity of PDMS, the structure perfectly transferred to the replica without any mechanical failure. Moreover, our designed mesh patterns offered the possibility of large area applications through varying the process parameters (pitch, beam spot size, laser fluence, and scan speed). Even though mesh patterns had relatively large pitch (190 μm), we were able to achieve high contact angle (>150°). Through pneumatically deformed structure, we clearly showed that the shape of the droplets on our laser-processed super-hydrophobic surface was spherical. Based on these outcomes, we can expect our single laser pulse exposure process can overcome many drawbacks and offer opportunities for advancing applications of the wetting phenomena.
Collapse
Affiliation(s)
- Hyuk-Jun Kwon
- Department of Information and Communication Engineering, DGIST, Daegu 42988, Korea.
| | - Junyeob Yeo
- Department of Physics, Kyungpook National University, Daegu 41566, Korea.
| | - Jae Eun Jang
- Department of Information and Communication Engineering, DGIST, Daegu 42988, Korea.
| | - Costas P Grigoropoulos
- Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA.
| | - Jae-Hyuck Yoo
- Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA.
- Physical and Life Sciences and NIF and Photon Sciences, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
| |
Collapse
|
18
|
Mi HY, Jing X, Thomsom JA, Turng LS. Promoting Endothelial Cell Affinity and Antithrombogenicity of Polytetrafluoroethylene (PTFE) by Mussel-Inspired Modification and RGD/Heparin Grafting. J Mater Chem B 2018; 6:3475-3485. [PMID: 30455952 PMCID: PMC6238965 DOI: 10.1039/c8tb00654g] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [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] [Indexed: 12/20/2022]
Abstract
When used as small-diameter vascular grafts (SDVGs), synthetic biomedical materials like polytetrafluoroethylene (PTFE) may induce thrombosis and intimal hyperplasia due to the lack of an endothelial cell layer. Modification of the PTFE in an aqueous solution is difficult because of its hydrophobicity. Herein, aiming to simultaneously promote endothelial cell affinity and antithrombogenicity, a mussel-inspired modification approach was employed to enable the grafting of various bioactive molecules like RGD and heparin. This approach involves a series of pragmatic steps including oxygen plasma treatment, dopamine (DA) coating, polyethylenimine (PEI) grafting, and RGD or RGD/heparin immobilization. Successful modification in each step was verified via Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Plasma treatment increased the hydrophilicity of PTFE, thereby allowing it to be efficiently coated with dopamine. Grafting of dopamine, RGD, and heparin led to an increase in surface roughness and a decrease in water contact angle due to increased surface energy. Platelet adhesion increased after dopamine and RGD modification, but it dramatically decreased when heparin was introduced. All of these modifications, especially the incorporation of RGD, showed favorable effects on endothelial cell attachment, viability, and proliferation. Due to strong cell-substrate interactions between endothelial cells and RGD, the RGD/heparin-grafted PTFE demonstrated high endothelial cell affinity. This facile modification method is highly suitable for all hydrophobic surfaces and provides a promising technique for SDVG modification to stimulate fast endothelialization and effective antithrombosis.
Collapse
Affiliation(s)
- Hao-Yang Mi
- Wisconsin Institute for Discovery, University of Wisconsin–Madison, WI, 53715, USA
- Department of Industrial Equipment and Control Engineering, South China University of Technology, Guangzhou, 510640, China
- Department of Mechanical Engineering, University of Wisconsin–Madison, WI, 53706, USA
| | - Xin Jing
- Wisconsin Institute for Discovery, University of Wisconsin–Madison, WI, 53715, USA
- Department of Industrial Equipment and Control Engineering, South China University of Technology, Guangzhou, 510640, China
- Department of Mechanical Engineering, University of Wisconsin–Madison, WI, 53706, USA
| | - James A. Thomsom
- Morgridge Institute for Research, University of Wisconsin–Madison, WI, 53715, USA
| | - Lih-Sheng Turng
- Wisconsin Institute for Discovery, University of Wisconsin–Madison, WI, 53715, USA
- Department of Mechanical Engineering, University of Wisconsin–Madison, WI, 53706, USA
| |
Collapse
|
19
|
Vandencasteele N, Nisol B, Viville P, Lazzaroni R, Castner DG, Reniers F. Study of plasma modified-PTFE for biological applications: relationship between protein resistant properties, plasma treatment, surface composition and surface roughness. Plasma Process Polym 2008; 5:661-671. [PMID: 24795545 PMCID: PMC4007513 DOI: 10.1002/ppap.200700143] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
PTFE samples were treated by low-pressure, O2 RF plasmas. The adsorption of BSA was used as a probe for the protein resistant properties. The exposure of PTFE to an O2 plasma leads to an increase in the chamber pressure. OES reveals the presence of CO, CO2 and F in the gas phase, indicating a strong etching of the PTFE surface by the O2 plasma. Furthermore, the high resolution C1s spectrum shows the appearance of CF3, CF and C-CF components in addition to the CF2 component, which is consistent with etching of the PTFE surface. WCA as high as 160° were observed, indicating a superhydrophobic behaviour. AFM Images of surfaces treated at high plasma power showed a increase in roughness. Lower amounts of BSA adsorption were detected on high power, O2 plasma-modified PTFE samples compared to low power, oxygen plasma-modified ones.
Collapse
Affiliation(s)
- Nicolas Vandencasteele
- Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium
| | - Bernard Nisol
- Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium
| | - Pascal Viville
- Laboratory for Chemistry of NoVel Materials, Université de Mons-Hainaut/Materia NoVa, Place du Parc, 20, B-7000 Mons, Belgium
| | - Roberto Lazzaroni
- Laboratory for Chemistry of NoVel Materials, Université de Mons-Hainaut/Materia NoVa, Place du Parc, 20, B-7000 Mons, Belgium
| | - David G. Castner
- National ESCA and Surface Analysis Center for Biomedical Problems, Departments of Chemical Engineering and Bioengineering, University of Washington, Box 351750, Seattle, Washington 98195, USA
| | - François Reniers
- Université Libre de Bruxelles, Faculty of Sciences, Analytical and Interfacial Chemistry, cp 255, bld Triomphe 2, B-1050 Bruxelles, Belgium
| |
Collapse
|