1
|
Wang H, Shi L, Qu Z, Zhang L, Wang X, Wang Y, Liu S, Ma H, Guo Z. Increasing Donor-Acceptor Interactions and Particle Dispersibility of Covalent Triazine Frameworks for Higher Crystallinity and Enhanced Photocatalytic Activity. ACS Appl Mater Interfaces 2024; 16:2296-2308. [PMID: 38189244 DOI: 10.1021/acsami.3c15536] [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: 01/09/2024]
Abstract
Covalent triazine frameworks (CTFs) have recently emerged as an efficient class of photocatalysts due to their structural diversity and excellent stability. Nevertheless, the synthetic reactions of CTFs have usually suffered from poor reversibility, resulting in a low crystallinity of the materials. Here, we report the introduction of methoxy groups on the monomer 2,5-diphenylthiazolo[5,4-d]thiazole to reinforce interlayer π-π interactions of the resulting donor-acceptor type CTFs, which improved crystallinity, further increasing the visible light absorption range and allowing for efficient separation and transport of carriers. The morphology is strongly correlated to the wettability, which has a significant impact on the mass transfer capacity and photocatalytic activity in the photocatalytic reaction. To further improve crystallinity and photocatalytic activity, CTF-NWU-T3 photocatalysts in a bowl shape were prepared using a SiO2 template. The energy band structure, photocatalytic hydrogen evolution, and pollutant degradation efficiency of involved materials were investigated. The donor-acceptor type CTF-NWU-T3 with a bowl-shaped morphology, synthesized using the template method and the introduction of methoxy groups, exhibited an excellent photocatalytic hydrogen production rate of 32064 μmol·h-1·g-1. This study highlights the significance of improving donor-acceptor interactions and increasing the dispersibility of catalyst particles in dispersion to enhance the photocatalytic activity of heterogeneous photocatalysts.
Collapse
Affiliation(s)
- Hao Wang
- School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| | - Lanting Shi
- School of Environmental and Chemical Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
| | - Zhi Qu
- School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| | - Lingfeng Zhang
- School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| | - Xiao Wang
- School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| | - Yefeng Wang
- School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| | - Shuai Liu
- School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| | - Haixia Ma
- School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| | - Zhaoqi Guo
- School of Chemical Engineering/Xi'an Key Laboratory of Special Energy Materials, Northwest University, Xi'an, Shaanxi 710069, P. R. China
| |
Collapse
|
2
|
Yu P, Li Z, Han M, Yu J. Growth of Vertical Graphene Sheets on Silicon Nanoparticles Well-Dispersed on Graphite Particles for High-Performance Lithium-Ion Battery Anode. Small 2023:e2307494. [PMID: 38041468 DOI: 10.1002/smll.202307494] [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: 08/28/2023] [Revised: 11/08/2023] [Indexed: 12/03/2023]
Abstract
With rapidly increasing demand for high energy density, silicon (Si) is greatly expected to play an important role as the anode material of lithium-ion batteries (LIBs) due to its high specific capacity. However, large volume expansion for silicon during the charging process is still a serious problem influencing its cycling stability. Here, a Si/C composite of vertical graphene sheets/silicon/carbon/graphite (VGSs@Si/C/G) is reported to address the electrochemical stability issues of Si/graphite anodes, which is prepared by adhering Si nanoparticles on graphite particles with chitosan and then in situ growing VGSs by thermal chemical vapor deposition. As a promising anode material, due to the buffering effect of VGSs and tight bonding between Si and graphite particles, the composite delivers a high reversible capacity of 782.2 mAh g-1 after 1000 cycles with an initial coulombic efficiency of 87.2%. Furthermore, the VGSs@Si/C/G shows a diffusion coefficient of two orders higher than that without growing the VGSs. The full battery using VGSs@Si/C/G anode and LiNi0.8 Co0.1 Mn0.1 O2 cathode achieves a high gravimetric energy density of 343.6 Wh kg-1 , a high capacity retention of 91.5% after 500 cycles and an excellent average CE of 99.9%.
Collapse
Affiliation(s)
- Peilun Yu
- Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Shenzhen Engineering Lab for Supercapacitor Materials, School of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, University Town, Shenzhen, 518055, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| | - Zhenwei Li
- Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Shenzhen Engineering Lab for Supercapacitor Materials, School of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, University Town, Shenzhen, 518055, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| | - Meisheng Han
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Jie Yu
- Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Shenzhen Engineering Lab for Supercapacitor Materials, School of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, University Town, Shenzhen, 518055, China
- Songshan Lake Materials Laboratory Dongguan, Guangdong, 523808, China
| |
Collapse
|
3
|
Yang M, Zuo S, Hu X. Metal Ion-induced Gelation of High-concentration Graphite-like Crystalline Nanosheet Aqueous Suspensions. Small 2023; 19:e2303310. [PMID: 37415522 DOI: 10.1002/smll.202303310] [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: 04/19/2023] [Indexed: 07/08/2023]
Abstract
The stability and transformation of nanomaterial aqueous suspensions are essential for their applications. Preparation of high-concentration carbon nanomaterials suspensions remains challenging due to their nonpolar nature. Herein, 200 mg mL-1 carbon nanomaterial aqueous suspensions are achieved by using graphite-like crystalline nanosheets (GCNs) with high hydrophilicity. Furthermore, these high-concentration GCN aqueous suspensions spontaneously transform into gels when induced by mono-, di-, and trivalent metal salt electrolytes at room temperature. Theoretical calculation of potential energy by DLVO theory reveals that the gelatinized GCNs is a new and metastable state between two usual forms of solution and coagulation. It is shown that the gelation of GCNs is due to the preferential orientation of nanosheets in an edge-edge arrangement, which differs from the case of solution and coagulation. High-temperature treatment of GCN gels produces metal/carbon materials with pore structures. This work provides a promising opportunity to create various metal/carbon functional materials.
Collapse
Affiliation(s)
- Mengmei Yang
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Songlin Zuo
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, 210037, China
| | - Xin Hu
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
| |
Collapse
|
4
|
Xu J, Wang J, Wen S, Ding S, Song J, Jiang S, Wang H. Preparation and Dispersion Performance of Hydrophobic Fumed Silica Aqueous Dispersion. Polymers (Basel) 2023; 15:3502. [PMID: 37688128 PMCID: PMC10490408 DOI: 10.3390/polym15173502] [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: 07/07/2023] [Revised: 07/31/2023] [Accepted: 08/09/2023] [Indexed: 09/10/2023] Open
Abstract
Hydrophobic fumed silica (HFS) is a commonly used rheology additive in waterborne coatings. A series of experiments were conducted on the HFS-dispersing technology in this study. The size and structure of HFS primary particles were observed via transmission electron microscopy (TEM). The measurement results of the TEM were D50 = 13.6 nm and D90 = 19.7 nm, respectively. The particle size and dispersion performance of HFS were tested via dynamic light scattering (DLS). Additionally, the HFS aqueous dispersion was prepared and compounded with waterborne polyacrylic latex and polyurethane resin. The elemental distribution of the coatings was characterized using energy dispersive spectroscopy (EDS). The results show that the HFS in a non-ionic polymer dispersant had the best dispersion performance. The particle size of the HFS in the aqueous dispersion is related to the dispersion conditions. Under optimized conditions, the HFS aqueous dispersion can be prepared with a particle size of D50 = 27.2 nm. The HFS aqueous dispersion has stable storage stability. Even after storage for 47 d, the particle size still did not change significantly.
Collapse
Affiliation(s)
| | | | - Shaoguo Wen
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; (J.X.); (J.W.); (S.D.); (J.S.); (S.J.); (H.W.)
| | | | | | | | | |
Collapse
|
5
|
Thalberg K, Ahmadi R, Stuckel J, Elfman P, Svensson M. The match between adhesive mixture powder formulations for inhalation and the inhaler device. Eur J Pharm Sci 2023; 186:106457. [PMID: 37116546 DOI: 10.1016/j.ejps.2023.106457] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 04/25/2023] [Accepted: 04/25/2023] [Indexed: 04/30/2023]
Abstract
The device or the formulation? Which one governs drug dispersibility from the inhaler? To address this question, three budesonide-containing reservoir DPIs: Novopulmon Novolizer®, Giona Easyhaler® and DuoResp Spiromax®, were analyzed using the Next Generation Impactor, NGI. Thereafter, the devices were carefully opened, emptied, and formulations were switched between devices. Finally, three 'prototype' formulations with carriers of different particle size were produced and tested in the Novolizer and Easyhaler devices. Among the DPI products, the two devices which have a flow path with a cyclone-type geometry, i.e., the Novolizer and the Spiromax, yielded a fine particle fraction, FPF, above 40%. The Easyhaler, which has a straight mouthpiece outlet, produced an FPF of 18 %. When the Novopulmon and the DuoResp formulations were assayed in the Easyhaler device, poor fine particle fractions were obtained. To the contrary, the Giona formulation produced a high FPF when tested in the Novolizer device. The results clearly show that the device is the dominating factor to dispersibility for the investigated products. Along the same lines, all three 'prototype' formulations produced high fine particle fractions in the Novolizer device, with the formulation with the largest carrier giving the best performance. Tested in the Easyhaler device, the prototype formulations produced low fine particle fractions, but interestingly, the formulation with the smallest carrier particle size yielded the highest FPF. It can be concluded that there is a link between inhaler design and the effect of carrier particle size, where larger carriers provide better dispersion in cyclone-type devices while smaller carriers seem to be more beneficial for inhalers which has a straight flow path for the powder formulation.
Collapse
Affiliation(s)
- Kyrre Thalberg
- Department of Food Technology, Engineering and Nutrition, Lund University, Sweden; Emmace Consulting AB, Lund, Sweden.
| | - Rasia Ahmadi
- Department of Food Technology, Engineering and Nutrition, Lund University, Sweden; Present address: AstraZeneca AB, Södertälje, Sweden
| | | | | | | |
Collapse
|
6
|
Kim J, Park DB, Hong Choi J, Jo M, Kim S, Oh P, Son Y. Synthesis of Highly Dispersible Functionalized Carbon Nanotubes as Conductive Material through a Facile Drying Process for High-Power Lithium-ion Batteries. ChemSusChem 2023; 16:e202201924. [PMID: 36513946 DOI: 10.1002/cssc.202201924] [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] [Received: 10/17/2022] [Revised: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Herein, surface-functionalized carbon nanotubes (CNTs) were successfully synthesized by dry ball milling that facilitates industrial application. The optimal conditions were determined by analyzing the physicochemical characteristics of CNTs, including the content of the carboxyl group (-COOH) induced on the surface of CNTs by co-existing dry ice based on the ball milling time. Among them, 30 s ball milling (CNTs-30s) showed a high dispersibility in N-methyl-2-pyrrolidone (NMP) while retaining most carboxyl groups and maintaining the intrinsic high conductivity. In the evaluation of rate capability and 5 C/5 C cyclability applied to the Li1+x (Ni1-y-z Coy Mnz )1-x O2 with 60 % Ni (NCM622) cathode, CNTs-30s showed excellent performance based on a well-formed conductive network. Regarding improved dispersion properties and electrochemical performance, the optimal surface functionalization conditions, dispersibility, and electrode properties according to the processing time were analyzed; based on these, the correlation with electrochemical performance was confirmed.
Collapse
Affiliation(s)
- Jiseong Kim
- Department of Electrical Engineering, Chosun University, 61452, Gwangju, Republic of Korea
| | - Da-Bin Park
- Department of Electrical Engineering, Chosun University, 61452, Gwangju, Republic of Korea
| | - Jae Hong Choi
- Department of Smart Green Technology Engineering, Pukyoung National University, 48547, Busan, Republic of Korea
- Department of Nanotechnology Engineering, Pukyoung National University, 48547, Busan, Republic of Korea
| | - Minki Jo
- Department of Electrical Engineering, Chosun University, 61452, Gwangju, Republic of Korea
| | - Seokhui Kim
- Department of Electrical Engineering, Chosun University, 61452, Gwangju, Republic of Korea
| | - Pilgun Oh
- Department of Smart Green Technology Engineering, Pukyoung National University, 48547, Busan, Republic of Korea
- Department of Nanotechnology Engineering, Pukyoung National University, 48547, Busan, Republic of Korea
| | - Yoonkook Son
- Department of Electrical Engineering, Chosun University, 61452, Gwangju, Republic of Korea
| |
Collapse
|
7
|
Chen L, Zhou C, Yang T, Zhou W, Chen Y, Wang L, Lu C, Dong L. Imparting Outstanding Dispersibility to Nanoscaled 2D COFs for Constructing Organic Solvent Forward Osmosis Membranes. Small 2023:e2300456. [PMID: 36932874 DOI: 10.1002/smll.202300456] [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] [Received: 02/04/2023] [Revised: 03/02/2023] [Indexed: 06/18/2023]
Abstract
In the context of thin-film nanocomposite membranes with interlayer (TFNi), nanoparticles are deposited uniformly onto the support prior to the formation of the polyamide (PA) layer. The successful implementation of this approach relies on the ability of nanoparticles to meet strict requirements regarding their sizes, dispersibility, and compatibility. Nevertheless, the synthesis of covalent organic frameworks (COFs) that are well-dispersed, uniformly morphological, and exhibit improved affinity to the PA network, while preventing agglomeration, remains a significant challenge. In this work, a simple and efficient method is presented for the synthesis of well-dispersed, uniformly morphological, and amine-functionalized 2D imine-linked COFs regardless of the ligand composition, group type, or framework pore size, by utilizing a polyethyleneimine (PEI) shielded covalent self-assembly strategy. Subsequently, the as-prepared COFs are incorporated into TFNi for the recycling of pharmaceutical synthetic organic solvents. After optimization, the membrane exhibits a high rejection rate and a favorable solvent flux, making it a reliable method for efficient organic recovery and the concentration of active pharmaceutical ingredient (API) from the mother liquor through an organic solvent forward osmosis (OSFO) process. Notably, this study represents the first investigation of the impact of COF nanoparticles in TFNi on OSFO performance.
Collapse
Affiliation(s)
- Li Chen
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Cailong Zhou
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Tianyi Yang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Wei Zhou
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Ying Chen
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Linghao Wang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Chenyang Lu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China
| | - Lichun Dong
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400044, P. R. China
| |
Collapse
|
8
|
Iqbal N, Hazra DK, Purkait A, Agrawal A, Saini MK, Kumar J. Eco-Oriented Formulation and Stabilization of Oil-Colloidal Biodelivery Systems Based on GC-MS/MS-Profiled Phytochemicals from Wild Tomato for Long-Term Retention and Penetration on Applied Surfaces for Effective Crop Protection. J Agric Food Chem 2023; 71:3719-3731. [PMID: 36802590 DOI: 10.1021/acs.jafc.2c08612] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Vegetable oils as hydrophobic reserves in oil dispersions (OD) provide a practical approach to halt bioactive degradation for user and environment-efficient pest management. Using biodegradable soybean oil (57%), castor oil ethoxylate (5%), calcium dodecyl benzenesulfonates as nonionic and an-ionic surfactants, bentonite (2%), and fumed silica as rheology modifiers, we created an oil-colloidal biodelivery sytem (30%) of tomato extract with homogenization. The quality-influencing parameters, such as particle size (4.5 μm), dispersibility (97%), viscosity (61 cps), and thermal stability (2 years), have been optimized in accordance with specifications. Vegetable oil was chosen for its improved bioactive stability, high smoke point (257 °C), coformulant compatibility, and as a green build-in-adjuvant by improving spreadability (20-30%), retention and penetration (20-40%). In in vitro testing, it efficiently controlled aphids with 90.5% mortalities and 68.7-71.2% under field-conditions without producing phytotoxicity. Wild tomato-derived phytochemicals can be a safe and efficient alternative to chemical pesticides when combined wisely with vegetable oils.
Collapse
Affiliation(s)
- Nusrat Iqbal
- Institute of Pesticide Formulation Technology (IPFT), Sec-20, Udhyog Vihar, Gurugram 122016, India
| | - Dipak Kumar Hazra
- All India Network Project on Pesticide Residues, Department of Agricultural Chemicals, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia, West Bengal 741252, India
| | - Aloke Purkait
- Department of Soil Science and Agricultural Chemistry, Palli-Siksha Bhavana (Institute of Agriculture), Visva - Bharati, Sriniketan, Birbhum, West Bengal 731236, India
| | - Amrish Agrawal
- Institute of Pesticide Formulation Technology (IPFT), Sec-20, Udhyog Vihar, Gurugram 122016, India
| | - Mahesh Kumar Saini
- National Institute of Plant Health Management, Himayat Sagar Rd, Hyderabad, Telangana 500030, India
| | - Jitendra Kumar
- Institute of Pesticide Formulation Technology (IPFT), Sec-20, Udhyog Vihar, Gurugram 122016, India
| |
Collapse
|
9
|
Balda M, Mackenzie K, Woszidlo S, Uhlig H, Möllmer J, Kopinke FD, Schüürmann G, Georgi A. Bottom-Up Synthesis of De-Functionalized and Dispersible Carbon Spheres as Colloidal Adsorbent. Int J Mol Sci 2023; 24:ijms24043831. [PMID: 36835241 PMCID: PMC9964220 DOI: 10.3390/ijms24043831] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 02/08/2023] [Accepted: 02/09/2023] [Indexed: 02/17/2023] Open
Abstract
Recent innovative adsorption technologies for water purification rely on micrometer-sized activated carbon (AC) for ultrafast adsorption or in situ remediation. In this study, the bottom-up synthesis of tailored activated carbon spheres (aCS) from sucrose as renewable feedstock is demonstrated. The synthesis is based on a hydrothermal carbonization step followed by a targeted thermal activation of the raw material. This preserves its excellent colloid properties, i.e., narrow particle size distribution around 1 µm, ideal spherical shape and excellent aqueous dispersibility. We investigated the ageing of the freshly synthesized, highly de-functionalized AC surface in air and aqueous media under conditions relevant to the practice. A slow but significant ageing due to hydrolysis and oxidation reactions was observed for all carbon samples, leading to an increase of the oxygen contents with storage time. In this study, a tailored aCS product was generated within a single pyrolysis step with 3 vol.-% H2O in N2 in order to obtain the desired pore diameters and surface properties. Adsorption characteristics, including sorption isotherms and kinetics, were investigated with monochlorobenzene (MCB) and perfluorooctanoic acid (PFOA) as adsorbates. The product showed high sorption affinities up to log (KD/[L/kg]) of 7.3 ± 0.1 for MCB and 6.2 ± 0.1 for PFOA, respectively.
Collapse
Affiliation(s)
- Maria Balda
- Department of Environmental Engineering, Helmholtz Centre for Environmental Research—UFZ, 04318 Leipzig, Germany
| | - Katrin Mackenzie
- Department of Environmental Engineering, Helmholtz Centre for Environmental Research—UFZ, 04318 Leipzig, Germany
| | - Silke Woszidlo
- Department of Environmental Engineering, Helmholtz Centre for Environmental Research—UFZ, 04318 Leipzig, Germany
| | - Hans Uhlig
- Institut für Nichtklassische Chemie e.V.—INC, 04318 Leipzig, Germany
| | - Jens Möllmer
- Institut für Nichtklassische Chemie e.V.—INC, 04318 Leipzig, Germany
| | - Frank-Dieter Kopinke
- Department of Environmental Engineering, Helmholtz Centre for Environmental Research—UFZ, 04318 Leipzig, Germany
| | - Gerrit Schüürmann
- Institute of Organic Chemistry, Technical University Bergakademie Freiberg, 09599 Freiberg, Germany
- Department of Ecological Chemistry, Helmholtz Centre for Environmental Research—UFZ, 04318 Leipzig, Germany
| | - Anett Georgi
- Department of Environmental Engineering, Helmholtz Centre for Environmental Research—UFZ, 04318 Leipzig, Germany
- Correspondence:
| |
Collapse
|
10
|
Sudo T, Yamashita S, Koike N, Kamiya H, Okada Y. Dispersibility of TiO 2 Nanoparticles in Less Polar Solvents: Role of Ligand Tail Structures. Chemistry 2023; 29:e202203608. [PMID: 36575960 DOI: 10.1002/chem.202203608] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 12/18/2022] [Accepted: 12/28/2022] [Indexed: 12/29/2022]
Abstract
Nanoparticles (NPs) are inherently prone to aggregation and loss of their size-derived properties, thus it is essential to enhance their dispersibility for applications. In less polar solvents, organic ligands containing oleyl groups are known as good dispersants due to their inefficient shell packing and inhibition of chain-chain crystallization as well as interdigitation between adjacent NPs. However, reagents with oleyl structures, such as oleic acid and oleylamine, can contain trans double bonds and saturated impurities, which might affect the chemical and/or physical properties of the NPs. Nevertheless, the effect of slight differences in surface ligand structure, including isomers, on the dispersibility of NPs has been little studied. We have synthesized five phosphonic acid ligands to investigate the structure-dispersibility relationship in detail. Dynamic light scattering and visible light transmittance revealed that not only regio- but also the stereochemistries of the C=C double bond in the ligand molecule, as well as the choice of solvent, are key factors in enhancing dispersibility.
Collapse
Affiliation(s)
- Tatsuya Sudo
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Shohei Yamashita
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Natsumi Koike
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Hidehiro Kamiya
- Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo, 184-8588, Japan
| | - Yohei Okada
- Department of Applied Biological Science, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo, 183-8509, Japan
| |
Collapse
|
11
|
Li W, Zhu L, Pan C, Chen W, Xu D, Kang D, Guo L, Mei Q, Zheng P, Zhang M. Insights into the Superior Bioavailability of Biogenic Sulfur from the View of Its Unique Properties: The Key Role of Trace Organic Substances. Environ Sci Technol 2023; 57:1487-1498. [PMID: 36629799 DOI: 10.1021/acs.est.2c07142] [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] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Elemental sulfur (S0) is widely utilized in environmental pollution control, while its low bioavailability has become a bottleneck for S0-based biotechnologies. Biogenic sulfur (bio-S0) has been demonstrated to have superior bioavailability, while little is known about its mechanisms thus far. This study investigated the bioavailability and relevant properties of bio-S0 based on the denitrifying activity of Thiobacillus denitrificans with chemical sulfur (chem-S0) as the control. It was found that the conversion rate and removal efficiency of nitrate in the bio-S0 system were 2.23 and 2.04 times those of the chem-S0 system. Bio-S0 was not pure orthorhombic sulfur [S: 96.88 ± 0.25% (w/w)]. Trace organic substances detected on the bio-S0 surface were revealed to contribute to its hydrophilicity, resulting in better dispersibility in the aqueous liquid. In addition, the adhesion force of T. denitrificans on bio-S0 was 1.54 times that of chem-S0, endowing a higher bacterial adhesion efficiency on the sulfur particle. The weaker intermolecular binding force due to the low crystallinity of bio-S0 led to enhanced cellular uptake by attached bacteria. The mechanisms for the superior bioavailability of bio-S0 were further proposed. This study provides a comprehensive view of the superior bioavailability of bio-S0 and is beneficial to developing high-quality sulfur resources.
Collapse
Affiliation(s)
- Wenji Li
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
| | - Lin Zhu
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
| | - Chao Pan
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
| | - Wenda Chen
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
| | - Dongdong Xu
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
| | - Da Kang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing100124, China
| | - Leiyan Guo
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
| | - Qingqing Mei
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
| | - Ping Zheng
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
- Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, Zhejiang310058, China
| | - Meng Zhang
- Department of Environmental Engineering, College of Environmental & Resource Sciences, Zhejiang University, Hangzhou, Zhejiang310058, China
- Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou, Zhejiang310058, China
| |
Collapse
|
12
|
Ng KL, Maciejewska BM, Qin L, Johnston C, Barrio J, Titirici MM, Tzanakis I, Eskin DG, Porfyrakis K, Mi J, Grobert N. Direct Evidence of the Exfoliation Efficiency and Graphene Dispersibility of Green Solvents toward Sustainable Graphene Production. ACS Sustain Chem Eng 2023; 11:58-66. [PMID: 36643002 PMCID: PMC9832534 DOI: 10.1021/acssuschemeng.2c03594] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 11/22/2022] [Indexed: 05/12/2023]
Abstract
Achieving a sustainable production of pristine high-quality graphene and other layered materials at a low cost is one of the bottlenecks that needs to be overcome for reaching 2D material applications at a large scale. Liquid phase exfoliation in conjunction with N-methyl-2-pyrrolidone (NMP) is recognized as the most efficient method for both the exfoliation and dispersion of graphene. Unfortunately, NMP is neither sustainable nor suitable for up-scaling production due to its adverse impact on the environment. Here, we show the real potential of green solvents by revealing the independent contributions of their exfoliation efficiency and graphene dispersibility to the graphene yield. By experimentally separating these two factors, we demonstrate that the exfoliation efficiency of a given solvent is independent of its dispersibility. Our studies revealed that isopropanol can be used to exfoliate graphite as efficiently as NMP. Our finding is corroborated by the matching ratio between the polar and dispersive energies of graphite and that of the solvent surface tension. This direct evidence of exfoliation efficiency and dispersibility of solvents paves the way to developing a deeper understanding of the real potential of sustainable graphene manufacturing at a large scale.
Collapse
Affiliation(s)
- Kai Ling Ng
- Department
of Materials, University of Oxford, Parks Road, OxfordOX1 3 PH, U.K.
| | | | - Ling Qin
- Department
of Engineering, University of Hull, Cottingham Road, HullHU6 7RX, U.K.
| | - Colin Johnston
- Department
of Materials, University of Oxford, Parks Road, OxfordOX1 3 PH, U.K.
| | - Jesus Barrio
- Department
of Chemical Engineering, Imperial College
London, South Kensington Campus, LondonSW7 2AZ, U.K.
| | - Maria-Magdalena Titirici
- Department
of Chemical Engineering, Imperial College
London, South Kensington Campus, LondonSW7 2AZ, U.K.
| | - Iakovos Tzanakis
- School
of Engineering, Computing and Mathematics, Oxford Brookes University, College Cl, Wheatley, OxfordOX33 1HX, U.K.
| | - Dmitry G Eskin
- Brunel
Centre for Advanced Solidification Technology, Brunel University London, Kingston Lane, UxbridgeUB8 3PH, U.K.
| | - Kyriakos Porfyrakis
- Faculty of
Engineering and Science, University of Greenwich, Central Avenue, Chatham Maritime, KentME4 4TB, U.K.
| | - Jiawei Mi
- Department
of Engineering, University of Hull, Cottingham Road, HullHU6 7RX, U.K.
| | - Nicole Grobert
- Department
of Materials, University of Oxford, Parks Road, OxfordOX1 3 PH, U.K.
- Williams
Advanced Engineering, Grove, OxfordshireOX12
0DQ, U.K.
| |
Collapse
|
13
|
Kim S, Landfester K, Ferguson CTJ. Hairy Conjugated Microporous Polymer Nanoparticles Facilitate Heterogeneous Photoredox Catalysis with Solvent-Specific Dispersibility. ACS Nano 2022; 16:17041-17048. [PMID: 36223132 PMCID: PMC9620398 DOI: 10.1021/acsnano.2c07156] [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] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 10/10/2022] [Indexed: 06/16/2023]
Abstract
Substrate accessibility is a key limiting factor for the efficiency of heterogeneous photoredox catalysis. Recently, a high photoactive surface area of conjugated microporous polymer nanoparticles (CMP NPs) has made them promising candidates for overcoming the mass transfer limitation to achieve high photocatalytic efficiency. However, this potential has not been realized due to limited dispersibility of CMP NPs in many solvents, particularly in water. Here, we report a polymer grafting strategy that furnishes versatile hairy CMP NPs with enhanced solvent-specific dispersibility. The method associates hundreds of solvent-miscible repeating units with one chain end of the photocatalyst surface, allowing minimal modification to the CMP network that preserves its photocatalytic activity. Therefore, the enhanced dispersibility of hairy CMP NPs in organic solvents or aqueous solutions affords high efficiency in various photocatalytic organic transformations.
Collapse
Affiliation(s)
- Seunghyeon Kim
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Katharina Landfester
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Calum T. J. Ferguson
- Max
Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United
Kingdom
| |
Collapse
|
14
|
Park M, Hwang S, Ju SY. The Effects of Lengths of Flavin Surfactant N-10-Alkyl Side Chains on Promoting Dispersion of a High-Purity and Diameter-Selective Single-Walled Nanotube. Nanomaterials (Basel) 2022; 12:3380. [PMID: 36234506 PMCID: PMC9565467 DOI: 10.3390/nano12193380] [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: 08/26/2022] [Revised: 09/17/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
Flavin with defined helical self-assembly helps to understand chemical designs for obtaining high-purity semiconducting (s)-single-walled carbon nanotubes (SWNT) in a diameter (dt)-selective manner for high-end applications. In this study, flavins containing 8, 12, 16, and 20 n-alkyl chains were synthesized, and their single/tandem effects on dt-selective s-SWNT dispersibility were investigated at isomolarity. Flavins with n-dodecyl and longer chain lengths (FC12, FC16, and FC20) act as good surfactants for stable SWNT dispersions whereas n-octyl flavin (FC8) exhibits poor dispersibility owing to the lack of SWNT buoyancy. When used with small-dt SWNT, FC8 displays chirality-selective SWNT dispersion. This behavior, along with various flavin helical motifs, prompts the development of criteria for 'side chain length (lS)' required for stable and dt-selective SWNT dispersion, which also explains lS-dependent dt-enrichment behavior. Moreover, SWNT dispersions with flavins with dodecyl and longer lS exhibit increased metallic (m)-SWNT, background absorption-contributing carbonaceous impurities (CIs) and preferential selectivity of s-SWNT with slightly larger dt. The increased CIs that affect the SWNT quantum yield were attributed to a solubility parameter. Furthermore, the effects of flavin lS, sonication bath temperature, centrifugal speed, and surfactant concentration on SWNT purity and s-/m-SWNT ratio were investigated. A tandem FC8/FC12 provides fine-tuning of dt-selective SWNT dispersion, wherein the FC8 ratio governs the tendency towards smaller dt. Kinetic and thermodynamic assemblies of tandem flavins result in different sorting behaviors in which wide dt-tunability was demonstrated using kinetic assembly. This study highlights the importance of appropriate side chain length and other extrinsic parameters to obtain dt-selective or high-purity s-SWNT.
Collapse
|
15
|
Zhang S, Fang N, Ji X, Gu Y, Xu Z, Jin S, Zhao Y. Dispersive 2D Triptycene-Based Crystalline Polymers: Influence of Regioisomerism on Crystallinity and Morphology. JACS Au 2022; 2:1638-1650. [PMID: 35911452 PMCID: PMC9326824 DOI: 10.1021/jacsau.2c00214] [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] [Indexed: 06/15/2023]
Abstract
The merging of good crystallinity and high dispersibility into two-dimensional (2D) layered crystalline polymers (CPs) still represents a challenge because a high crystallinity is often accompanied by intimate interlayer interactions that are detrimental to the material processibility. We herein report a strategy to address this dilemma using rationally designed three-dimensional (3D) monomers and regioisomerism-based morphology control. The as-synthesized CPs possess layered 2D structures, where the assembly of layers is stabilized by relatively weak van der Waals interactions between C-H bonds other than the usual π-π stackings. The morphology and dispersibility of the CPs are finely tuned via regioisomerism. These findings shed light on how to modulate the crystallinity, morphology, and ultimate function of crystalline polymers using the spatial arrangements of linking groups.
Collapse
Affiliation(s)
- Siquan Zhang
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy
of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Nie Fang
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy
of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Xiaonan Ji
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy
of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Yuefei Gu
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy
of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Zhenchuang Xu
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy
of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| | - Shangbin Jin
- School
of Chemical Engineering and Technology, Xi’an Jiaotong University, Xianning West Road, Xi’an, Shaanxi 710049, China
| | - Yanchuan Zhao
- Key
Laboratory of Organofluorine Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy
of Sciences, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
- Key
Laboratory of Energy Regulation Materials, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Ling-Ling Road, Shanghai 200032, China
| |
Collapse
|
16
|
Saita S, Takeda SI, Kawasaki H. Hansen Solubility Parameter Analysis on Dispersion of Oleylamine-Capped Silver Nanoinks and their Sintered Film Morphology. Nanomaterials (Basel) 2022; 12:nano12122004. [PMID: 35745345 PMCID: PMC9230637 DOI: 10.3390/nano12122004] [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] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/07/2022] [Accepted: 06/07/2022] [Indexed: 12/19/2022]
Abstract
Optimizing stabilizers and solvents is crucial for obtaining highly dispersed nanoparticle inks. Generally, nonpolar (hydrophobic) ligand-stabilized nanoparticles show superior dispersibility in nonpolar solvents, whereas polar ligand (hydrophilic)-stabilized nanoparticles exhibit high dispersibility in polar solvents. However, these properties are too qualitative to select optimum stabilizers and solvents for stable nanoparticle inks, and researchers often rely on their experiences. This study presents a Hansen solubility parameter (HSP)-based analysis of the dispersibility of oleylamine-capped silver nanoparticle (OAm-Ag NP) inks for optimizing ink preparation. We determined the HSP sphere of the OAm-Ag NPs, defined as the center coordinate, and the interaction radius in 3D HSP space. The solvent’s HSP inside the HSP sphere causes high dispersibility of the OAm-Ag NPs in the solvent. In contrast, the HSPs outside the sphere resulted in low dispersibility in the solvent. Thus, we can quantitatively predict the dispersibility of the OAm-Ag NPs in a given solvent using the HSP approach. Moreover, the HSP sphere method can establish a correlation between the dispersibility of the particles in inks and the sintered film morphology, facilitating electronic application of the nanoparticle inks. The HSP method is also helpful for optimizing stabilizers and solvents for stable nanoparticle inks in printed electronics.
Collapse
Affiliation(s)
- Satoshi Saita
- Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan;
| | - Shin-ichi Takeda
- Takeda Colloid Techno-Consulting Co., Ltd., Osaka 564-0051, Japan
- Correspondence: (S.-i.T.); (H.K.)
| | - Hideya Kawasaki
- Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering, Kansai University, Osaka 564-8680, Japan;
- Correspondence: (S.-i.T.); (H.K.)
| |
Collapse
|
17
|
Lee G, Park J, Jang SH, Lee SY, Seong J, Jung JW, Kim K, Hwang TG, Choi J. Synthesis and Characterization of Diketopyrrolopyrrole-Based Aggregation-Induced Emission Nanoparticles for Bioimaging. Molecules 2022; 27:2984. [PMID: 35566334 PMCID: PMC9103447 DOI: 10.3390/molecules27092984] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 05/02/2022] [Accepted: 05/03/2022] [Indexed: 12/10/2022] Open
Abstract
Conventional fluorescent dyes have the property of decreasing fluorescence due to aggregation-caused quenching effects at high concentrations, whereas aggregation-induced emission dyes have the property of increasing fluorescence as they aggregate with each other. In this study, diketopyrrolopyrrole-based long-wavelength aggregation-induced emission dyes were used to prepare biocompatible nanoparticles suitable for bioimaging. Aggregation-induced emission nanoparticles with the best morphology and photoluminescence intensity were obtained through a fast, simple preparation method using an ultrasonicator. The optimally prepared nanoparticles from 3,6-bis(4-((E)-4-(bis(40-(1,2,2-triphenylvinyl)-[1,10-biphenyl]-4-yl)amino)styryl)phenyl)-2,5-dihexyl-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DP-R2) with two functional groups having aggregation-induced emission properties and additional donating groups at the end of the triphenylamine groups were considered to have the greatest potential as a fluorescent probe for bioimaging. Furthermore, it was found that the tendency for aggregation-induced emission, which was apparent for the dye itself, became much more marked after the dyes were incorporated within nanoparticles. While the photoluminescence intensities of the dyes were observed to decrease rapidly over time, the prepared nanoparticles encapsulated within the biocompatible polymers maintained their initial optical properties very well. Lastly, when the cell viability test was conducted, excellent biocompatibility was demonstrated for each of the prepared nanoparticles.
Collapse
Affiliation(s)
- Geonho Lee
- Material & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Korea; (G.L.); (S.H.J.); (S.Y.L.)
- Department of Chemical Engineering, KyungHee University, Yongin 17104, Korea;
| | - Jongwook Park
- Department of Chemical Engineering, KyungHee University, Yongin 17104, Korea;
| | - Seong Hyun Jang
- Material & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Korea; (G.L.); (S.H.J.); (S.Y.L.)
- Laboratory of Organic Photo-Functional Materials, Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Sang Yoon Lee
- Material & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Korea; (G.L.); (S.H.J.); (S.Y.L.)
- Department of Advanced Materials Engineering for Information & Electronics, Integrated Education Institute for Frontier Science & Technology BK21 Four, KyungHee University, Yongin 17104, Korea;
| | - Jihyun Seong
- Department of Chemical and Biochemical Engineering, Dongguk University, Seoul 04620, Korea;
| | - Jae Woong Jung
- Department of Advanced Materials Engineering for Information & Electronics, Integrated Education Institute for Frontier Science & Technology BK21 Four, KyungHee University, Yongin 17104, Korea;
| | - Kyobum Kim
- Department of Chemical and Biochemical Engineering, Dongguk University, Seoul 04620, Korea;
| | - Tae Gyu Hwang
- Research Center for Advanced Specialty Chemicals, Korea Research Institute of Chemical Technology (KRICT), Ulsan 44412, Korea
| | - Jun Choi
- Material & Component Convergence R&D Department, Korea Institute of Industrial Technology (KITECH), Ansan 15588, Korea; (G.L.); (S.H.J.); (S.Y.L.)
| |
Collapse
|
18
|
Qureshi MI, Qureshi B. Probing the Use of Silane-Grafted Fumed Silica Nanoparticles to Produce Stable Transformer Oil-Based Nanofluids. Materials (Basel) 2021; 14:ma14247649. [PMID: 34947243 PMCID: PMC8703595 DOI: 10.3390/ma14247649] [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: 10/26/2021] [Revised: 12/06/2021] [Accepted: 12/10/2021] [Indexed: 12/05/2022]
Abstract
In this experimental investigation, hydrophobic silane-grafted fumed nano-silica was employed in transformer oil to formulate nanofluids (NFs). A cold-air atmosphere-pressure plasma reactor working on the principle of dielectric barrier discharge was designed and utilized to functionalize the surface of these nanoparticles. A field emission scanning electron microscope (FE-SEM) coupled with energy-dispersive X-ray (EDX) module and Fourier transform infrared (FTIR) spectroscopy were used to scan surface features of new and plasma-treated nanoparticles. The study revealed considerable changes in the surface chemistry of nanoparticles, which led to good dispersibility and stability of nanofluids. The measurements of AC breakdown voltages (AC-BDV) of nanofluids so prepared were conducted according to IEC-Std 60156, and a significant improvement in the dielectric strength was achieved. A statistical analysis of these results was performed using Weibull probabilistic law. At a 5% probability of failure, modified nanofluid remarkably exhibited a 60% increase in breakdown voltage. The dielectric properties such as variation of εr and tan δ in temperature of up to 70 °C were measured and compared with untreated fluid. Results exhibit an increase in tan δ and a slight decrease in permittivity of nanofluids. The analysis also revealed that while unpolar silane coating of NPs increased the breakdown strength, the polar-amino-silane-coated NPs in oil resulted in a drastic reduction. Details of this antagonistic trend are elaborated in this paper.
Collapse
Affiliation(s)
- Muhammad I. Qureshi
- Department of Electrical Engineering, Lahore University of Management Sciences, Lahore 54792, Pakistan;
| | - Basit Qureshi
- Department of Computer Science, Prince Sultan University, Riyadh 11586, Saudi Arabia
- Correspondence:
| |
Collapse
|
19
|
Ishii N, Mizobuchi S, Kawano Y, Hanawa T. Preparation and Evaluation of a Powdered Rebamipide Mouthwash as In-Hospital Formulation: Considering Dispersion before Use in Patients. Pharmaceutics 2021; 13:1848. [PMID: 34834266 DOI: 10.3390/pharmaceutics13111848] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 09/21/2021] [Revised: 10/15/2021] [Accepted: 10/28/2021] [Indexed: 11/17/2022] Open
Abstract
In Japan, rebamipide (RB) mouthwash (RB-MW) for oral mucositis induced by cancer chemotherapy has been prepared using in-hospital formulation. Usually, RB-MW is prepared by dispersing crushed commercial RB tablets in the dispersion medium; however, uniformity is difficult to obtain due to low solubility. The current study aims is to prepare homogenously dispersed formulations using the fine particles of crushed tablets by a method that is convenient for hospital use. Commercial RB tablets were pre-milled at different milling times as "RB-Ts". A ground mixture was then prepared by co-grinding the RB-Ts with HPC-L or PVP K30 via a benchtop ball milling machine (MM400). The physicochemical properties of samples were evaluated for PXRD, FTIR, turbidity, particle size, and solubility. Although the milling of RB tablets decreased the crystallinity, the length of milling time did not affect them. In contrast, grinding using MM400 significantly decreased RB crystallinity; their PXRD patterns showed a halo, suggesting the amorphization of RB crystals by grinding. Although solubility and turbidity seemed to be affected by the type of polymer rather than the particle size, every ground mixture showed high dispersibility. Thus, grinding the RB-Ts with polymers appeared to be the most promising way to obtain stable dispersion as an in-hospital formulation.
Collapse
|
20
|
Li C, Liu J, Zhang K, Zhang S, Lee Y, Li T. Coating the Right Polymer: Achieving Ideal Metal-Organic Framework Particle Dispersibility in Polymer Matrixes Using a Coordinative Crosslinking Surface Modification Method. Angew Chem Int Ed Engl 2021; 60:14138-14145. [PMID: 33856717 DOI: 10.1002/anie.202104487] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [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: 03/31/2021] [Indexed: 11/07/2022]
Abstract
This work describes the first generalizable method to modify various metal-organic framework (MOF) surfaces with polyimide, polysulfone, polycarbonate, and polymer of intrinsic microporosity-1 (PIM-1). The method first utilizes electrostatic adsorption to rapidly decorate positively charged MOF surfaces with a layer of negatively charged metal-organic nanocapsule, PgC5 Cu. After mixing with the polymer, the copper open metal sites on PgC5 Cu can coordinatively crosslink the polar functional groups on the surface polymer upon thermal activation thereby resulting in the immobilization of a uniform sub-10 nm polymer coating. We quantitatively analyzed the distribution of free path spacing between MOF particles and demonstrated that when the surface polymer matches the matrix polymer, the MOF dispersion was not only visually improved but also found to align perfectly with a theoretically predicted ideal dispersion model where no aggregation driving force was present.
Collapse
Affiliation(s)
- Conger Li
- School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, P. R. China
| | - Junhong Liu
- School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, P. R. China
| | - Kexin Zhang
- School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, P. R. China
| | - Songwei Zhang
- School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, P. R. China
| | - Yongjin Lee
- School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, P. R. China.,Department of Chemical Engineering, Inha University, Incheon, 22212, Republic of Korea
| | - Tao Li
- School of Physical Science and Technology, Shanghai Tech University, Shanghai, 201210, P. R. China
| |
Collapse
|
21
|
Kawano Y, Shimizu Y, Hanawa T. Testing a Benchtop Wet-Milling Method for Preparing Nanoparticles and Suspensions as Hospital Formulations. Pharmaceutics 2021; 13:482. [PMID: 33918130 DOI: 10.3390/pharmaceutics13040482] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 03/17/2021] [Revised: 03/30/2021] [Accepted: 03/31/2021] [Indexed: 11/29/2022] Open
Abstract
In clinical practice, for elderly or pediatric patients who have difficulty swallowing, solid dosage forms such as tablets or capsules are crushed or unsealed, prepared as powder forms, and often administered as suspensions. However, because their dispersibility is poor, aggregation or precipitation occurs readily. Once precipitation and deposition happen, redispersion is difficult, which can limit patient and caretaker drug adherence. In this study, we attempted to prepare nanoparticles as a hospital formulation by a benchtop wet-milling method to obtain a suspension with high dispersibility. This is the first study to apply the wet-milling method to prepare the hospital formulation. We chose cefditoren pivoxil (CDTR-PI) as an experimental active pharmaceutical ingredient. CDTR-PI crystals were physically mixed with various water-soluble polymers such as polyvinylpyrrolidone, polyethylene oxide, hydroxypropyl cellulose, or hypromellose and wet-milled with a surface-active agent (sodium lauryl sulfate) under different conditions. The mean particle diameter of most of the samples was less than 200 nm. In FTIR spectra of ground samples, peak shifts suggesting inter- or intramolecular interactions between CDTR-PI and the other additive agents were not observed. Besides, the nanoparticle suspension had favorable dispersibility, as determined using a dispersion stability analyzer. Providing a suspension with high dispersibility makes dispense with the resuspension, the patient’s medication adherence would improve. These results show that suspended liquid formulations of active pharmaceutical ingredients could be obtained by the simple wet-milling method as hospital formulations.
Collapse
|
22
|
Alkhouzaam A, Qiblawey H, Khraisheh M. Polydopamine Functionalized Graphene Oxide as Membrane Nanofiller: Spectral and Structural Studies. Membranes (Basel) 2021; 11:86. [PMID: 33513669 PMCID: PMC7910935 DOI: 10.3390/membranes11020086] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [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: 11/05/2020] [Revised: 12/05/2020] [Accepted: 12/17/2020] [Indexed: 11/17/2022]
Abstract
High-degree functionalization of graphene oxide (GO) nanoparticles (NPs) using polydopamine (PDA) was conducted to produce polydopamine functionalized graphene oxide nanoparticles (GO-PDA NPs). Aiming to explore their potential use as nanofiller in membrane separation processes, the spectral and structural properties of GO-PDA NPs were comprehensively analyzed. GO NPs were first prepared by the oxidation of graphite via a modified Hummers method. The obtained GO NPs were then functionalized with PDA using a GO:PDA ratio of 1:2 to obtain highly aminated GO NPs. The structural change was evaluated using XRD, FTIR-UATR, Raman spectroscopy, SEM and TEM. Several bands have emerged in the FTIR spectra of GO-PDA attributed to the amine groups of PDA confirming the high functionalization degree of GO NPs. Raman spectra and XRD patterns showed different crystalline structures and defects and higher interlayer spacing of GO-PDA. The change in elemental compositions was confirmed by XPS and CHNSO elemental analysis and showed an emerging N 1s core-level in the GO-PDA survey spectra corresponding to the amine groups of PDA. GO-PDA NPs showed better dispersibility in polar and nonpolar solvents expanding their potential utilization for different purposes. Furthermore, GO and GO-PDA-coated membranes were prepared via pressure-assisted self-assembly technique (PAS) using low concentrations of NPs (1 wt. %). Contact angle measurements showed excellent hydrophilic properties of GO-PDA with an average contact angle of (27.8°).
Collapse
Affiliation(s)
| | - Hazim Qiblawey
- Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713 Doha, Qatar; (A.A.); (M.K.)
| | | |
Collapse
|
23
|
Peng Y, Hu Q, Liu Y, Li J, Huang X. Discrete Supertetrahedral Tn Chalcogenido Clusters Synthesized in Ionic Liquids: Crystal Structures and Photocatalytic Activity. Chempluschem 2020; 85:2487-2498. [PMID: 33215856 DOI: 10.1002/cplu.202000639] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 09/22/2020] [Revised: 11/06/2020] [Indexed: 11/11/2022]
Abstract
Discrete supertetrahedral Tn chalcogenido clusters, which can be regarded as the smallest semiconductor quantum dots with precise chemical composition, have attracted considerable attention due to their outstanding photoluminescent, photoelectric, and photo/electrocatalytic properties. Such discrete molecular clusters are suitable for solution processing towards functional materials and can be used as precursors for constructing open-framework chalcogenides. Traditionally they were synthesized hydro(solvo)thermally with molecular solvents (e. g. water or organic amines), while until recently imidazolium-based ionic liquids (ILs) were found suitable for their preparation acting as reactive solvent and stabilizer for molecular clusters. We discuss herein recent advances in the syntheses, crystal structures, and selected properties of discrete supertetrahedral Tn chalcogenido clusters obtained in ILs. In particular, the enhanced photocatalytic properties of monodispersed Tn clusters in solvents are highlighted.
Collapse
Affiliation(s)
- Yingchen Peng
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China.,University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Qianqian Hu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China
| | - Yifan Liu
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China.,College of Chemistry, Fuzhou University, Fuzhou, 350002, P. R. China
| | - Jianrong Li
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China
| | - Xiaoying Huang
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China
| |
Collapse
|
24
|
Majdoub M, Anfar Z, Amedlous A. Emerging Chemical Functionalization of g-C 3N 4: Covalent/Noncovalent Modifications and Applications. ACS Nano 2020; 14:12390-12469. [PMID: 33052050 DOI: 10.1021/acsnano.0c06116] [Citation(s) in RCA: 95] [Impact Index Per Article: 23.8] [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
Atomically 2D thin-layered structures, such as graphene nanosheets, graphitic carbon nitride nanosheets (g-C3N4), hexagonal boron nitride, and transition metal dichalcogenides are emerging as fascinating materials for a good array of domains owing to their rare physicochemical characteristics. In particular, graphitic carbon nitride has turned into a hot subject in the scientific community due to numerous qualities such as simple preparation, electrochemical properties, high adsorption capacity, good photochemical properties, thermal stability, and acid-alkali chemical resistance, etc. Basically, g-C3N4 is considered as a polymeric material consisting of N and C atoms forming a tri-s-triazine network connected by planar amino groups. In comparison with most C-based materials, g-C3N4 possesses electron-rich characteristics, basic moieties, and hydrogen-bonding groups owing to the presence of hydrogen and nitrogen atoms; therefore, it is taken into account as an interesting nominee to further complement carbon in applications of functional materials. Nevertheless, g-C3N4 has some intrinsic limitations and drawbacks mainly related to a relatively poor specific surface area, rapid charge recombination, a limited light absorption range, and a poor dispersibility in both aqueous and organic mediums. To overcome these shortcomings, numerous chemical modification approaches have been conducted with the aim of expanding the range of application of g-C3N4 and enhancing its properties. In the current review, the comprehensive survey is conducted on g-C3N4 chemical functionalization strategies including covalent and noncovalent approaches. Covalent approaches consist of establishing covalent linkage between the g-C3N4 structure and the chemical modifier such as oxidation/carboxylation, amidation, polymer grafting, etc., whereas the noncovalent approaches mainly consist of physical bonding and intermolecular interaction such as van der Waals interactions, electrostatic interactions, π-π interactions, and so on. Furthermore, the preparation, characterization, and diverse applications of functionalized g-C3N4 in various domains are described and recapped. We believe that this work will inspire scientists and readers to conduct research with the aim of exploring other functionalization strategies for this material in numerous applications.
Collapse
Affiliation(s)
- Mohammed Majdoub
- Laboratory of Materials, Catalysis & Valorization of Natural Resources, Hassan II University, Casablanca 20000, Morocco
| | - Zakaria Anfar
- Laboratory of Materials & Environment, Ibn Zohr University, Agadir 80000, Morocco
- Institute of Materials Science of Mulhouse, Haute Alsace University, Mulhouse 68100, France
- Strasbourg University, Strasbourg 67081, France
| | - Abdallah Amedlous
- Laboratory of Materials, Catalysis & Valorization of Natural Resources, Hassan II University, Casablanca 20000, Morocco
| |
Collapse
|
25
|
Ghosh A, Banerjee T. Nanotized curcumin-benzothiophene conjugate: A potential combination for treatment of cerebral malaria. IUBMB Life 2020; 72:2637-2650. [PMID: 33037778 DOI: 10.1002/iub.2394] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 08/20/2020] [Revised: 09/17/2020] [Accepted: 09/24/2020] [Indexed: 11/07/2022]
Abstract
The declining effectiveness of the available antimalarial drugs due to drug resistance requires a continued effort to develop new therapeutic approaches. In this context, combination therapies hold a great promise for developing effective first-line antimalarial treatments for reducing malaria mortality. The present study explores the antimalarial efficacy of nanotized formulation of curcumin in combination with benzothiophene compound 6 (3-bromo-N-(4-fluorobenzyl)-benzo[b]thiophene-2-carboxamide) with a view to achieve better efficacy at a very low dose in comparison to that accomplished with monotherapy alone. Herein, we formulated nanotized conjugate of curcumin and compound 6 (cur-compound 6) in the size range of 30-90 nm as observed via TEM, AFM and DLS analysis in the study. The nanotized preparation was found to be readily dispersible in water, physically and chemically stable and exhibited sustained release profile of both curcumin and compound 6 till 48 hr. Treatment of P. falciparum parasites with the nanotized conjugate for 24 hr resulted in rapid clearance of the parasites. Furthermore, P. berghei infected mice treated with nanotized conjugate formulation survived till 90 days with complete eradication of the parasites from RBC. This improved efficacy of the nanotized formulation was possible because of the increased absorption of the compounds via oral administration owing to enhanced dispersibility of the formulation in aqueous medium. Moreover, an improved oral bioavailability of the nanotized formulation lowered the dosage at which the pharmacological effect was achieved while avoiding any observable adverse harmful side effects.
Collapse
Affiliation(s)
- Aparajita Ghosh
- Molecular Sciences Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi, India
| | - Tanushree Banerjee
- Dr. D. Y. Patil Biotechnology & Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
| |
Collapse
|
26
|
Phan DN, Choi HY, Oh SG, Kim M, Lee H. Fabrication of ZnO Nanoparticle-Decorated Nanofiber Mat with High Uniformity Protected by Constructing Tri-Layer Structure. Polymers (Basel) 2020; 12:E1859. [PMID: 32824965 DOI: 10.3390/polym12091859] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 08/06/2020] [Accepted: 08/13/2020] [Indexed: 12/29/2022] Open
Abstract
We demonstrate a sequential electrospinning process involving the adsorption of ZnO nanoparticles on the surface of bio-based polyester, which is a terpolyester of a renewable isosorbide (ISB) monomer, ethylene glycol, 1,4-cyclohexane dimethanol, and terephthalic acid, the-so-called PEICT, to fabricate stable ZnO nanoparticles/PEICT nanofiber composite system protected with other two PEICT nanofiber mats. We found that post-electrospinning treatment with a particular solvent was effective to remove a residual solvent molecule in the PEICT nanofibers, which induced significant aggregation of the nanoparticles, leading to non-uniform distribution of the particles on the surface. Sequential electrospinning of the PEICT solution to sandwich ZnO nanoparticle-decorated PEICT nanofiber mat enabled to attain protected the inorganic/organic hybrid nanofiber mat, improving the long-term stability, and the reproducibility of the inorganic particles decorated nanofiber fabrication.
Collapse
|
27
|
Wang M, Li H, Li Y, Mo F, Li Z, Chai R, Wang H. Dispersibility and Size Control of Silver Nanoparticles with Anti-Algal Potential Based on Coupling Effects of Polyvinylpyrrolidone and Sodium Tripolyphosphate. Nanomaterials (Basel) 2020; 10:nano10061042. [PMID: 32485998 PMCID: PMC7352764 DOI: 10.3390/nano10061042] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 05/10/2020] [Revised: 05/27/2020] [Accepted: 05/27/2020] [Indexed: 11/16/2022]
Abstract
In nearly all the cases of biotoxicity studies of silver nanoparticles (AgNPs), AgNPs used often have general dispersibility and wide size distribution, which may inevitably generate imprecise results. Herein, a kind of synthesis method by coupling effects of polyvinylpyrrolidone (PVP) and sodium tripolyphosphate (STPP) was proposed, in order to prepare AgNPs with better dispersibility and a stable size. Based on this, the preparation mechanism of AgNPs and the potential anti-algae toxicity were analyzed. UV-vis analysis showed that the particle size distribution of AgNPs prepared by co-protective agents was more uniform. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and energy dispersive X-ray (EDX) were used to confirm that the obtained nano silver was of a high purity and stable size (~30 nm in diameter). Zeta potential and Fourier transform infrared spectroscopy (FTIR) analysis results indicated the synthesis mechanism of AgNPs by co-protective agents, more precisely, PVP limited the polynegative effect and prevented the linear induction of P3O105- produced by STPP during the growth of silver nuclei. Subsequently, Chlorella and Scenedesmus obliquus were utilized to test the toxicity of AgNPs, confirming that AgNPs synthesized through co-protective agents have potential inhibitory ability on algae, but not severe. This study provides a basic theory for the induction of synthetic AgNPs by various factors in the natural environment and a scientific reference for the environmental risk assessment.
Collapse
|
28
|
Grunert F, Wehmeier A, Blume A. New Insights into the Morphology of Silica and Carbon Black Based on Their Different Dispersion Behavior. Polymers (Basel) 2020; 12:E567. [PMID: 32143508 DOI: 10.3390/polym12030567] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 01/07/2020] [Revised: 02/07/2020] [Accepted: 02/24/2020] [Indexed: 11/17/2022] Open
Abstract
Precipitated silica in combination with bifunctional organosilanes almost fully replaces currently the commonly used carbon black fillers in modern passenger car tire tread compounds to improve tire properties such as wet traction (safety) and rolling resistance (fuel consumption). However, it is still challenging to reach a sufficient level of abrasion resistance (service life). An optimum macrodispersion quality of the silica is a fundamental precondition for an optimum abrasion resistance. This goal can be reached by the development of new tailor-made highly dispersible silica grades. In order to achieve this, it is essential to be aware of the analytical silica parameters, which affect the dispersion process. One of these parameters known from carbon black is the structure of the filler. To gain deeper insights into the in-rubber dispersibility of the silica, the structure was investigated by two different methods, the DOA measurement and the void volume measurement. The results were correlated to the in-rubber macrodispersion. In contrast to carbon black filled compounds, no sufficient correlation of the structure with the macrodispersion could be found for the silica-filled compounds. Therefore, it was concluded that the morphology of silica differs from that one that is claimed for carbon black. Additional investigations like TEM, FT-IR and X-ray diffraction measurements were carried out. Carbon black shows a more elastic structure, which can withstand the external forces during the mixing process in a better way. Silica contains a much higher void volume in the structure even after exposed to high forces. These new findings will help to understand the macrodispersion process in rubber in a better way.
Collapse
|
29
|
Hiyama A, Otaki JM. Dispersibility of the Pale Grass Blue Butterfly Zizeeria m aha (Lepidoptera: Lycaenidae) Revealed by One-Individual Tracking in the Field: Quantitative Comparisons between Subspecies and between Sexes. Insects 2020; 11:insects11020122. [PMID: 32074952 PMCID: PMC7073966 DOI: 10.3390/insects11020122] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [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: 01/24/2020] [Revised: 02/07/2020] [Accepted: 02/12/2020] [Indexed: 11/16/2022]
Abstract
The pale grass blue butterfly Zizeeria maha (Lepidoptera: Lycaenidae) has been used as an environmental indicator species for radioactive pollution after the Fukushima nuclear accident. Here, based on the one-individual tracking method in the field, we examined dispersal-associated and other behavioral traits of this butterfly, focusing on two subspecies, Z. maha argia in mainland Japan and Z. maha okinawana in Okinawa. The accumulated distances in the adult lifespan were 18.9 km and 38.2 km in mainland and Okinawa males, respectively, and 15.0 km and 7.8 km in mainland and Okinawa females, respectively. However, the mean distance from the starting point was only 24.2 m and 21.1 m in the mainland and Okinawa males, respectively, and 13.7 m and 7.4 m in the mainland and Okinawa females, respectively. Some quantitative differences in resting and feeding were found between subspecies and between sexes. The ARIMA (autoregressive integrated moving average) model indicated that the dispersal distance was 52.3 m (99% confidence interval value of 706.6 m) from the starting point in mainland males. These results support the idea that despite some behavioral differences, both subspecies of this butterfly are suitable as an environmental indicator because of the small dispersal ranges.
Collapse
Affiliation(s)
- Atsuki Hiyama
- The BCPH Unit of Molecular Physiology, Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus, Okinawa 903-0213, Japan
- Laboratory of Conservation Ecology, Faculty of Science and Engineering, Chuo University, Tokyo 112-8551, Japan
- Japan Butterfly Conservation Society, Tokyo 140-0014, Japan
| | - Joji M. Otaki
- The BCPH Unit of Molecular Physiology, Department of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus, Okinawa 903-0213, Japan
- Correspondence: ; Tel.: +81-98-895-8557
| |
Collapse
|
30
|
Rong Z, Zhao M, Wang Y. Effects of Modified Nano-SiO 2 Particles on Properties of High-Performance Cement-Based Composites. Materials (Basel) 2020; 13:ma13030646. [PMID: 32024078 PMCID: PMC7041374 DOI: 10.3390/ma13030646] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [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: 12/06/2019] [Revised: 01/13/2020] [Accepted: 01/27/2020] [Indexed: 11/16/2022]
Abstract
In this research, silane coupling agent was used to modify the surface of nano-SiO2, particles and the effects of modified nano-SiO2 particles on the mechanical properties of high-performance cement-based composites and its mechanism were systematically studied. The results indicated that the optimum modification parameters were a coupling agent content of 10%, reaction temperature of 65 °C, and reaction time of 8 h. Compared with the unmodified nano-SiO2, the modified nano-SiO2 promoted and accelerated the hydration process of cement. The pozzolanic effect, filling effect, and nucleation effect of modified nano-SiO2 made the microstructure of the composite more compact, and thus improved static mechanical properties of cement-based composites.
Collapse
Affiliation(s)
- Zhidan Rong
- School of Materials Science and Engineering, Southeast University, Nanjing 21189, China; (M.Z.); (Y.W.)
- JiangSu Key Laboratory of Construction Materials, Nanjing 211189, China
- Correspondence: ; Tel.: +86-18651832130
| | - Mingyu Zhao
- School of Materials Science and Engineering, Southeast University, Nanjing 21189, China; (M.Z.); (Y.W.)
- JiangSu Key Laboratory of Construction Materials, Nanjing 211189, China
| | - Yali Wang
- School of Materials Science and Engineering, Southeast University, Nanjing 21189, China; (M.Z.); (Y.W.)
- JiangSu Key Laboratory of Construction Materials, Nanjing 211189, China
| |
Collapse
|
31
|
Sun H, Ling L, Ren Z, Memon SA, Xing F. Effect of Graphene Oxide/Graphene Hybrid on Mechanical Properties of Cement Mortar and Mechanism Investigation. Nanomaterials (Basel) 2020; 10:nano10010113. [PMID: 31936031 PMCID: PMC7023157 DOI: 10.3390/nano10010113] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 12/03/2019] [Revised: 12/30/2019] [Accepted: 12/31/2019] [Indexed: 11/20/2022]
Abstract
This paper evaluated the effect of graphene oxide/graphene (GO/GR) hybrid on mechanical properties of cement mortar. The underlying mechanism was also investigated. In the GO/GR hybrid, GO was expected to act as a dispersant for GR while GR was used as reinforcement in mortar due to its excellent mechanical properties. For the mortar specimen, flexural and compressive strength were measured at varied GO to GR ratios of 1:0, 3:1, 1:1, 1:3, and 0:1 by keeping the total amount of GO and GR constant. The underlying mechanism was investigated through the dispersibility of GR, heat releasing characteristics during hydration, and porosity of mortar. The results showed that GO/GR hybrid significantly enhanced the flexural and compressive strength of cement mortars. The flexural strength reached maximum at GO:GR = 1:1, where the enhancement level was up to 23.04% (28 days) when compared to mortar prepared with only GO, and up to 15.63% (7 days) when compared to mortar prepared with only GR. In terms of compressive strength, the enhancement level for GO:GR = 3:1 was up to 21.10% (3 days) when compared with that of mortar incorporating GO only. The enhancement in compressive strength with mortar at GO:GR = 1:1 was up to 14.69% (7-day) when compared with mortar incorporating GR only. In addition to dispersibility, the compressive strength was also influenced by other factors, such as the degree of hydration, porosity, and pore size distribution of mortar, which made the mortars perform best at different ages.
Collapse
Affiliation(s)
- Hongfang Sun
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (H.S.); (L.L.); (Z.R.)
| | - Li Ling
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (H.S.); (L.L.); (Z.R.)
| | - Zhili Ren
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (H.S.); (L.L.); (Z.R.)
| | - Shazim Ali Memon
- Department of Civil Engineering and Environmental Engineering, School of Engineering and Digital Sciences, Nazarbayev University, Astana 010000, Kazakhstan;
| | - Feng Xing
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; (H.S.); (L.L.); (Z.R.)
- Correspondence:
| |
Collapse
|
32
|
Deng C, Gong RH, Huang C, Zhang X, Jin XY. Tensile Strength and Dispersibility of Pulp/Danufil Wet-Laid Hydroentangled Nonwovens. Materials (Basel) 2019; 12:ma12233931. [PMID: 31783630 PMCID: PMC6926622 DOI: 10.3390/ma12233931] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 10/23/2019] [Revised: 11/19/2019] [Accepted: 11/25/2019] [Indexed: 11/16/2022]
Abstract
Wet-laid hydroentangled nonwovens are widely used for disposable products, but these products generally do not have good dispersibility and can block sewage systems after being discarded into toilets. In this study, both pulp fibers and Danufil fibers are selected as we hypothesize that the high wet strength and striated surface of Danufil fibers would allow us to produce nonwovens with better dispersibility while having enough mechanical properties. The wet strength and dispersibility of nonwovens are systematically studied by investigating the influence of the fiber blend ratio, fiber length, and water jet pressure. The results indicate that the percent dispersion could be as high as 81.3% when the wet strength is higher than 4.8 N, which has been improved greatly comparing the percent dispersion of 67.6% reported before.
Collapse
Affiliation(s)
- Chao Deng
- Engineering Research Center of Technical Textiles, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China; (C.H.); (X.Z.)
- Correspondence: (C.D.); (X.-Y.J.); Tel.: +86-021-6779-2794 (C.D.); +86-021-6779-2787 (X.-Y.J.)
| | - R. Hugh Gong
- Textile Technology, School of Materials, The University of Manchester, Manchester M13 9PL, UK;
| | - Chen Huang
- Engineering Research Center of Technical Textiles, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China; (C.H.); (X.Z.)
| | - Xing Zhang
- Engineering Research Center of Technical Textiles, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China; (C.H.); (X.Z.)
| | - Xiang-Yu Jin
- Engineering Research Center of Technical Textiles, Ministry of Education, College of Textiles, Donghua University, Shanghai 201620, China; (C.H.); (X.Z.)
- Correspondence: (C.D.); (X.-Y.J.); Tel.: +86-021-6779-2794 (C.D.); +86-021-6779-2787 (X.-Y.J.)
| |
Collapse
|
33
|
Brunaugh AD, Wu T, Kanapuram SR, Smyth HDC. Effect of Particle Formation Process on Characteristics and Aerosol Performance of Respirable Protein Powders. Mol Pharm 2019; 16:4165-4180. [PMID: 31448924 DOI: 10.1021/acs.molpharmaceut.9b00496] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [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: 11/28/2022]
Abstract
Pulmonary delivery of biopharmaceuticals may enable targeted local therapeutic effect and noninvasive systemic administration. Dry powder inhaler (DPI) delivery is an established patient-friendly approach for delivering large molecules to the lungs; however, the complexities of balancing protein stability with aerosol performance require that the design space of biopharmaceutical DPI formulations is rigorously explored. Utilizing four rationally selected formulations obtained using identical atomization conditions, an extensive study of the effect of the particle formation process (spray drying or spray freeze-drying) on powder properties, aerosol performance, and protein stability was performed. Multiple linear regression analysis was used to understand the relationship between powder properties, device dispersion mechanism, and aerosol performance. Spray drying and spray freeze-drying, despite the same spraying conditions, produced powders with vastly different physical characteristics, though similar aerosol performance. The resulting regression model points to the significance of particle size, density, and surface properties on the resulting aerosol performance, with these factors weighing differently according to the device dispersion mechanism utilized (shear-based or impaction-based). The physical properties of the produced spray dried and spray freeze-dried powders have differing implications for long-term stability, which will be explored extensively in a future study.
Collapse
Affiliation(s)
- Ashlee D Brunaugh
- College of Pharmacy , The University of Texas at Austin , 2409 West University Avenue, PHR 4.214 , Austin , Texas 78712 , United States
| | - Tian Wu
- Amgen , One Amgen Center Drive , Thousand Oaks , California 91320 , United States
| | - Sekhar R Kanapuram
- Amgen , One Amgen Center Drive , Thousand Oaks , California 91320 , United States
| | - Hugh D C Smyth
- College of Pharmacy , The University of Texas at Austin , 2409 West University Avenue, PHR 4.214 , Austin , Texas 78712 , United States
| |
Collapse
|
34
|
Yan CN, Xu L, Liu QD, Zhang W, Jia R, Liu CZ, Wang SS, Wang LP, Li G. Surface-Induced ARGET ATRP for Silicon Nanoparticles with Fluorescent Polymer Brushes. Polymers (Basel) 2019; 11:E1228. [PMID: 31340523 PMCID: PMC6680766 DOI: 10.3390/polym11071228] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 06/16/2019] [Revised: 07/03/2019] [Accepted: 07/09/2019] [Indexed: 11/30/2022] Open
Abstract
Well-defined polymer brushes attached to nanoparticles offer an elegant opportunity for surface modification because of their excellent mechanical stability, functional versatility, high graft density as well as controllability of surface properties. This study aimed to prepare hybrid materials with good dispersion in different solvents, and to endow this material with certain fluorescence characteristics. Well-defined diblock copolymers poly (styrene)-b-poly (hydroxyethyl methyl acrylate)-co-poly (hydroxyethyl methyl acrylate- rhodamine B) grafted silica nanoparticles (SNPs-g-PS-b-PHEMA-co-PHEMA-RhB) hybrid materials were synthesized via surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (SI-ARGET ATRP). The SNPs surfaces were modified by 3-aminopropyltriethoxysilane (KH-550) firstly, then the initiators 2-Bromoisobutyryl bromide (BIBB) was attached to SNPs surfaces through the esterification of acyl bromide groups and amidogen groups. The synthetic initiators (SNPs-Br) were further used for the SI-ARGET ATRP of styrene (St), hydroxyethyl methyl acrylate (HEMA) and hydroxyethyl methyl acrylate-rhodamine B (HEMA-RhB). The results indicated that the SI-ARGET ATRP initiator had been immobilized onto SNPs surfaces, the Br atom have located at the end of the main polymer chains, and the polymerization process possessed the characteristic of controlled/"living" polymerization. The SNPs-g-PS-b-PHEMA-co-PHEMA-RhB hybrid materials show good fluorescence performance and good dispersion in water and EtOH but aggregated in THF. This study demonstrates that the SI-ARGET ATRP provided a unique way to tune the polymer brushes structure on silica nanoparticles surface and further broaden the application of SI-ARGET ATRP.
Collapse
Affiliation(s)
- Chun-Na Yan
- College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Lin Xu
- College of Materials Science and Engineering, Qingdao University, Qingdao 266071, China
| | - Qing-Di Liu
- College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Wei Zhang
- College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Rui Jia
- College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Cheng-Zhi Liu
- College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Shuang-Shuang Wang
- College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China
| | - Li-Ping Wang
- College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China.
| | - Guang Li
- College of Materials Science and Engineering, Liaocheng University, Liaocheng 252059, China.
| |
Collapse
|
35
|
Eliasson L, Oliveira G, Ehrnell M, Höglund E, Alminger M. Tailoring bilberry powder functionality through preprocessing and drying. Food Sci Nutr 2019; 7:1379-1386. [PMID: 31024711 PMCID: PMC6475759 DOI: 10.1002/fsn3.972] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 08/02/2018] [Revised: 12/06/2018] [Accepted: 01/25/2019] [Indexed: 11/06/2022] Open
Abstract
Berry powders are popular as ingredients in a range of food products, where they naturally provide flavor, color, texture, polyphenols, fiber, and other nutrients. The choices regarding processing techniques and conditions influence the quality attributes of berry powders. The aim of this study was to study the effects on bilberry powder functionalities of applying different preprocessing techniques (purée mixing and juice pressing vs. untreated whole berries) prior to hot air drying and milling. Drying of press cake reduced the drying time by 72% and increased the total apparent phenolic content of the final powder by 44%, as compared to the powder of dried whole berries. The press cake powder showed an easier flowing behavior than the powders from whole berries and puréed berries. Dispersibility (in water and dairy cream) was 60% higher for powders from whole berries and puréed berries, as compared to press cake. The total phenolic content of the dispersed powders was highest for whole berries and puréed berries. Bilberry powder functionality can be modulated through the selection of an appropriate preprocessing technique before drying and milling. This tailors the powder properties into food ingredients ready for different applications, without the need for additives.
Collapse
Affiliation(s)
- Lovisa Eliasson
- RISE Research Institute of Sweden, Agrifood and BioscienceGothenburgSweden
| | - Gabriel Oliveira
- Department of Biology and Biological Engineering, Food and Nutrition ScienceChalmers University of TechnologyGothenburgSweden
| | - Maria Ehrnell
- RISE Research Institute of Sweden, Agrifood and BioscienceGothenburgSweden
| | - Evelina Höglund
- RISE Research Institute of Sweden, Agrifood and BioscienceGothenburgSweden
| | - Marie Alminger
- Department of Biology and Biological Engineering, Food and Nutrition ScienceChalmers University of TechnologyGothenburgSweden
| |
Collapse
|
36
|
Zhang X, He JX, Huang G, Zhou C, Feng MM, Li Y. Preparation and Characteristics of Ethylene Bis(Stearamide)-Based Graphene-Modified Asphalt. Materials (Basel) 2019; 12:ma12050757. [PMID: 30841607 PMCID: PMC6427634 DOI: 10.3390/ma12050757] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [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: 02/07/2019] [Revised: 02/25/2019] [Accepted: 03/01/2019] [Indexed: 12/05/2022]
Abstract
In this study, graphene-modified asphalt (GMA) was prepared from SK-70# matrix asphalt and ethylene bis(stearamide) (EBS). Based on the uniform design method, a model was created using Data Processing System (DPS) software and First Optimization (1stOpt) software using the graphene mixing amount, EBS mixing amount, shear rate, shear time, and shear temperature as factors and using the asphalt penetration, softening point, force ductility, SHRP-PG test, and multistress creep recovery data as indices. Calculations and analysis showed that the optimal composition and preparation parameters of GMA are as follows: the graphene proportion is 20‰, the EBS proportion is 1%, the shear rate is 6000 r.p.m., the shear time is 180 min, and the shear temperature is 140 °C. The prepared GMA had a significantly improved softening point, low-temperature fracture energy, antirutting factor, and creep recovery rate, indicating that adding graphene can improve the high- and low-temperature performance of asphalt. The prepared GMA was characterized by X-ray diffraction (XRD). The dispersibility of graphene in asphalt was evaluated by fluorescence microscopy and Image-Pro Plus imaging software. The results show that graphene can exist in asphalt in a stable form, which increases the loose-layered structure of stacked asphalt or gum. The intense adsorption effect of graphene strengthens the ordered structure of asphalt. However, due to its dispersibility characteristics, some graphene exists in asphalt in clustered form. When the graphene-to-dispersant ratio approaches the optimal value, the dispersant changes the form of graphene in asphalt from irregular clusters to regular clusters and from large, distinct clusters to small, indistinct clusters. When dispersant cannot uniformly disperse graphene in asphalt, graphene clusters primarily form medium-sized grains.
Collapse
Affiliation(s)
- Xia Zhang
- National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China.
| | - Jun-Xi He
- National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China.
| | - Gang Huang
- National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China.
| | - Chao Zhou
- National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China.
| | - Man-Man Feng
- National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China.
| | - Yan Li
- Chongqing Tongli Expressway Maintenance Engineering Co., Ltd., Chongqing 400074, China.
| |
Collapse
|
37
|
Reina G, Ruiz A, Murera D, Nishina Y, Bianco A. "Ultramixing": A Simple and Effective Method To Obtain Controlled and Stable Dispersions of Graphene Oxide in Cell Culture Media. ACS Appl Mater Interfaces 2019; 11:7695-7702. [PMID: 30693754 DOI: 10.1021/acsami.8b18304] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The last decade has seen an increase in the application of graphene oxide (GO) in the biomedical field. GO has been successfully exploited for its ability to deliver many kinds of drugs into target cells. However, GO toxicity assessment is still controversial. Several studies have demonstrated that GO protein coating is crucial to alleviate the material's toxicity. Besides, coronation leads to the formation of big agglomerates, reducing the cellular uptake of the material and thus its therapeutic efficiency. In this work, we propose a simple and efficient method based on rapid (ultra-turrax, UT) mixing to control protein corona formation. Using the UT protocol, we were able to reduce GO agglomeration in the presence of proteins and obtain stable GO dispersions in cell culture media. By labelling GO with luminescent nanoparticles (quantum dots), we studied the GO internalization kinetic and efficiency. Comparing the "classic" and UT protocols, we found that the latter allows faster and more efficient internalization both in macrophages and HeLa cells without affecting cell viability. We believe that the use of UT protocol will be interesting and suitable for the preparation of next-generation GO-based drug-delivery platforms.
Collapse
Affiliation(s)
- Giacomo Reina
- University of Strasbourg, CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572 , 67000 Strasbourg , France
| | - Amalia Ruiz
- University of Strasbourg, CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572 , 67000 Strasbourg , France
| | - Diane Murera
- University of Strasbourg, CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572 , 67000 Strasbourg , France
| | | | - Alberto Bianco
- University of Strasbourg, CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR 3572 , 67000 Strasbourg , France
| |
Collapse
|
38
|
Wang X, Chen B, Dong W, Zhang X, Li Z, Xiang Y, Chen H. Hydrophilicity-Controlled Conjugated Microporous Polymers for Enhanced Visible-Light-Driven Photocatalytic H 2 Evolution. Macromol Rapid Commun 2018; 40:e1800494. [PMID: 30556197 DOI: 10.1002/marc.201800494] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [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: 06/28/2018] [Revised: 11/14/2018] [Indexed: 12/25/2022]
Abstract
To take advantage of high surface area of network conjugated microporous polymers, four linear or network conjugated polymers L-PDBT, L-PDBT-O, N-PDBT, and N-PDBT-O are designed in terms of water-compatibility, and it turned out that microporous network N-PDBT-O exhibited the highest hydrogen evolution rate (HER) at 366 µmol h-1 under visible light irradiation (λ > 420 nm, one of best reported pristine polymer-based photocatalysts), which is three times higher than the corresponding linear L-PDBT-O. Water contact angle measurements revealed that benzothiophene-sulfone-based conjugated polymers display better water compatibility and adsorption, and the synergic effect of better hydrophilic surface and higher surface area of N-PDBT-O might eventually lead to more exposed active sites in comparison to linear L-PDBT-O in the H2 evolution suspension system. The hydrophilicity-controlled strategy could be applied to design of other network conjugated microporous polymer photocatalysts in an attempt to improve the activity.
Collapse
Affiliation(s)
- Xuepeng Wang
- College of Science, Huazhong Agricultural University, Wuhan, 430070, P. R. China
| | - Bo Chen
- College of Science, Huazhong Agricultural University, Wuhan, 430070, P. R. China
| | - Wenbo Dong
- College of Science, Huazhong Agricultural University, Wuhan, 430070, P. R. China
| | - Xiaohu Zhang
- College of Science, Huazhong Agricultural University, Wuhan, 430070, P. R. China
| | - Zibiao Li
- Institute of Materials Research and Engineering (IMRE), 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634
| | - Yonggang Xiang
- College of Science, Huazhong Agricultural University, Wuhan, 430070, P. R. China
| | - Hao Chen
- College of Science, Huazhong Agricultural University, Wuhan, 430070, P. R. China
| |
Collapse
|
39
|
Voronova M, Rubleva N, Kochkina N, Afineevskii A, Zakharov A, Surov O. Preparation and Characterization of Polyvinylpyrrolidone/Cellulose Nanocrystals Composites. Nanomaterials (Basel) 2018; 8:nano8121011. [PMID: 30563129 PMCID: PMC6315985 DOI: 10.3390/nano8121011] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [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: 11/07/2018] [Revised: 11/21/2018] [Accepted: 12/04/2018] [Indexed: 11/16/2022]
Abstract
Composite films and aerogels of polyvinylpyrrolidone/cellulose nanocrystals (PVP/CNC) were prepared by solution casting and freeze-drying, respectively. Investigations into the PVP/CNC composite films and aerogels over a wide composition range were conducted. Thermal stability, morphology, and the resulting reinforcing effect on the PVP matrix were explored. FTIR, TGA, DSC, X-ray diffraction, SEM, and tensile testing were used to examine the properties of the composites. It was revealed PVP-assisted CNC self-assembly that produces uniform CNC aggregates with a high aspect ratio (length/width). A possible model of the PVP-assisted CNC self-assembly has been considered. Dispersibility of the composite aerogels in water and some organic solvents was studied. It was shown that dispersing the composite aerogels in water resulted in stable colloidal suspensions. CNC particles size in the redispersed aqueous suspensions was near similar to the CNC particles size in never-dried CNC aqueous suspensions.
Collapse
Affiliation(s)
- Marina Voronova
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia.
| | - Natalia Rubleva
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia.
| | - Nataliya Kochkina
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia.
| | - Andrei Afineevskii
- Department of Physical and Colloid Chemistry, Ivanovo State University of Chemistry and Technology, 7 Sheremetevsky Prospect, Ivanovo 153000, Russia.
| | - Anatoly Zakharov
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia.
| | - Oleg Surov
- G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 1 Akademicheskaya St., Ivanovo 153045, Russia.
| |
Collapse
|
40
|
Zhao T, Liu F, Duan X, Xiao C, Liu X. Physicochemical Properties of Lutein-Loaded Microcapsules and Their Uptake via Caco-2 Monolayers. Molecules 2018; 23:E1805. [PMID: 30037053 PMCID: PMC6099687 DOI: 10.3390/molecules23071805] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 07/14/2018] [Accepted: 07/16/2018] [Indexed: 11/20/2022] Open
Abstract
Lutein is one of the most important carotenoids that can be utilized in foods as a natural pigment and nutraceutical ingredient to improve eye health. However, its utilization is limited due to its poor solubility. Chemically, the highly unsaturated structure of lutein makes it extremely susceptible to light, oxygen, heat, and pro-oxidants and therefore easily oxidized, decomposed or dissociated. In this study, we aimed to imbed natural lutein to improve its storage stability and enhance its water dispersibility. As two commonly studied water-soluble and water-insoluble food-grade surfactants, lecithin and sodium caseinate (NaCas) were chosen as the wall materials, and lutein-loaded lecithin microcapsules and NaCas microcapsules were prepared, the results revealed the lutein-loaded NaCas microcapsules not only exhibited better solubility and stability than those of lutein-loaded lecithin microcapsules, but also were more stable when stored at 4 °C, 25 °C, 37 °C. Moreover, the lutein-loaded NaCas microcapsules were more easily absorbed by the intestinal Caco-2 cells than natural lutein. Considering the dispersibility, stability and cell absorption effect, the NaCas-based microparticle is a potential carrier for lutein.
Collapse
Affiliation(s)
- Tong Zhao
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China.
| | - Fuguo Liu
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China.
| | - Xiang Duan
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China.
| | - Chunxia Xiao
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China.
| | - Xuebo Liu
- Laboratory of Functional Chemistry and Nutrition of Food, College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China.
| |
Collapse
|
41
|
Seong H, Kim G, Jeon J, Jeong H, Noh J, Kim Y, Kim H, Huh S. Experimental Study on Characteristics of Grinded Graphene Nanofluids with Surfactants. Materials (Basel) 2018; 11:ma11060950. [PMID: 29867066 PMCID: PMC6024890 DOI: 10.3390/ma11060950] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [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: 05/11/2018] [Revised: 05/30/2018] [Accepted: 06/01/2018] [Indexed: 02/02/2023]
Abstract
In earlier studies, much research has focused on increasing the efficiency of heat exchanger fields. Therefore, in this study, graphene nanofluid was fabricated for use as a heat transfer medium for a heat exchanger. Graphene has excellent electrical conductivity, mechanical properties, and heat transfer properties. It is expected that the heat transfer efficiency will be improved by fabricating the nanofluid. However, graphene is prone to sedimentation, because of its cohesion due to van der Waals binding force. In this experiment, a nanofluid was fabricated with enhanced dispersibility by surfactant and the ball-milling process. The zeta potential, absorbance, and thermal conductivity of the nanofluid were measured. As a result, when using the ratio of 2:1 (graphene:sodium dodecyl sulfate (SDS)), a higher thermal conductivity was obtained than in other conditions.
Collapse
Affiliation(s)
- HeonJin Seong
- Department of Energy and Mechanical Engineering, Gyeongsang National University, 38, Cheondaegukchi-gil 53064, Tongyeong-si, Korea.
| | - GwiNam Kim
- Department of Mechanical & Automotive Engineering, Suncheon Jeil College, 17 Jeildaehak-gil 57997, Suncheon-si, Korea.
| | - JongHoon Jeon
- Department of Energy and Mechanical Engineering, Gyeongsang National University, 38, Cheondaegukchi-gil 53064, Tongyeong-si, Korea.
| | - HyoMin Jeong
- Department of Energy and Mechanical Engineering, Gyeongsang National University, 38, Cheondaegukchi-gil 53064, Tongyeong-si, Korea.
| | - JungPil Noh
- Department of Energy and Mechanical Engineering, Gyeongsang National University, 38, Cheondaegukchi-gil 53064, Tongyeong-si, Korea.
| | - YoungJu Kim
- Department of Exploration System Research, KIGAM Pohang Branch, 905, Yeongilman-daero 37559, Pohang-si, Korea.
| | - HyunJi Kim
- Department of Exploration System Research, KIGAM Pohang Branch, 905, Yeongilman-daero 37559, Pohang-si, Korea.
| | - SunChul Huh
- Department of Energy and Mechanical Engineering, Gyeongsang National University, 38, Cheondaegukchi-gil 53064, Tongyeong-si, Korea.
| |
Collapse
|
42
|
Tan Y, Zou Y, Wu L, Huang Q, Yang D, Chen M, Ban M, Wu C, Wu T, Bai S, Song T, Zhang Q, Sun B. Highly Luminescent and Stable Perovskite Nanocrystals with Octylphosphonic Acid as a Ligand for Efficient Light-Emitting Diodes. ACS Appl Mater Interfaces 2018; 10:3784-3792. [PMID: 29299911 DOI: 10.1021/acsami.7b17166] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
All inorganic perovskite nanocrystals (NCs) of CsPbX3 (X = Cl, Br, I, or their mixture) are regarded as promising candidates for high-performance light-emitting diode (LED) owing to their high photoluminescence (PL) quantum yield (QY) and easy synthetic process. However, CsPbX3 NCs synthesized by the existing methods, where oleic acid (OA) and oleylamine (OLA) are generally used as surface-chelating ligands, suffer from poor stability due to the ligand loss, which drastically deteriorates their PL QY, as well as dispersibility in solvents. Herein, the OA/OLA ligands are replaced with octylphosphonic acid (OPA), which dramatically enhances the CsPbX3 stability. Owing to a strong interaction between OPA and lead atoms, the OPA-capped CsPbX3 (OPA-CsPbX3) NCs not only preserve their high PL QY (>90%) but also achieve a high-quality dispersion in solvents after multiple purification processes. Moreover, the organic residue in purified OPA-CsPbBr3 is only ∼4.6%, which is much lower than ∼29.7% in OA/OLA-CsPbBr3. Thereby, a uniform and compact OPA-CsPbBr3 film is obtained for LED application. A green LED with a current efficiency of 18.13 cd A-1, corresponding to an external quantum efficiency of 6.5%, is obtained. Our research provides a path to prepare high-quality perovskite NCs for high-performance optoelectronic devices.
Collapse
Affiliation(s)
- Yeshu Tan
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Yatao Zou
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Linzhong Wu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Qi Huang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Di Yang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Min Chen
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Muyang Ban
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Chen Wu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Tian Wu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Sai Bai
- Department of Physics, Chemistry and Biology (IFM), Linköping University , SE-581 83 Linköping, Sweden
| | - Tao Song
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Qiao Zhang
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| | - Baoquan Sun
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University , Suzhou 215123, People's Republic of China
| |
Collapse
|
43
|
Cui H, Yan X, Monasterio M, Xing F. Effects of Various Surfactants on the Dispersion of MWCNTs-OH in Aqueous Solution. Nanomaterials (Basel) 2017; 7:nano7090262. [PMID: 28878154 PMCID: PMC5618373 DOI: 10.3390/nano7090262] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [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: 07/16/2017] [Revised: 08/23/2017] [Accepted: 08/30/2017] [Indexed: 11/26/2022]
Abstract
Dispersion of carbon nanotubes (CNTs) is a challenge for their application in the resulting matrixes. The present study conducted a comparison investigation of the effect of four surfactants: Alkylphenol polyoxyethylene ether (APEO), Silane modified polycarboxylate (Silane-PCE), I-Cationic polycarboxylate (I-C-PCE), and II-Cationic polycarboxylate (II-C-PCE) on the dispersion of hydroxyl functionalized multi-walled carbon nanotubes (MWCNTs–OH). Among the four surfactants, APEO and II-C-PCE provide the best and the worst dispersion effect of CNTs in water, respectively. Dispersion effect of MWCNTs–OH has been characterized by optical microscope (OM), field emission-scanning electron microscope (FE-SEM), and Ultraviolet–visible spectroscopy (UV–Vis).The OM images are well consistent with the UV–Vis results. Based on the chemical molecular structures of the four surfactants, the mechanism of MWCNTs–OH dispersion in water was investigated. For each kind of surfactant, an optimum surfactant/MWCNTs–OH ratio has been determined. This ratio showed a significant influence on the dispersion of MWCNTs–OH. Surfactant concentration higher or lower than this value can weaken the dispersion quality of MWCNTs–OH.
Collapse
Affiliation(s)
- Hongzhi Cui
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Xiantong Yan
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China.
| | - Manuel Monasterio
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China.
- Shenzhen Advanced Civil Engineering Technology, Association Research Center, Shenzhen Institute of Information Technology, Shenzhen 518172, China.
- State Key Lab of Advanced Welding Production Technology, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, China.
| | - Feng Xing
- Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China.
| |
Collapse
|
44
|
Pan M, Shi X, Lyu F, Levy-Wendt BL, Zheng X, Tang SKY. Encapsulation of Single Nanoparticle in Fast-Evaporating Micro-droplets Prevents Particle Agglomeration in Nanocomposites. ACS Appl Mater Interfaces 2017; 9:26602-26609. [PMID: 28704029 DOI: 10.1021/acsami.7b07773] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This work describes the use of fast-evaporating micro-droplets to finely disperse nanoparticles (NPs) in a polymer matrix for the fabrication of nanocomposites. Agglomeration of particles is a key obstacle for broad applications of nanocomposites. The classical approach to ensure the dispersibility of NPs is to modify the surface chemistry of NPs with ligands. The surface properties of NPs are inevitably altered, however. To overcome the trade-off between dispersibility and surface-functionality of NPs, we develop a new approach by dispersing NPs in a volatile solvent, followed by mixing with uncured polymer precursors to form micro-droplet emulsions. Most of these micro-droplets contain no more than one NP per drop, and they evaporate rapidly to prevent the agglomeration of NPs during the polymer curing process. As a proof of concept, we demonstrate the design and fabrication of TiO2 NP@PDMS nanocomposites for solar fuel generation reactions with high photocatalytic efficiency and recyclability arising from the fine dispersion of TiO2. Our simple method eliminates the need for surface functionalization of NPs. Our approach is applicable to prepare nanocomposites comprising a wide range of polymers embedded with NPs of different composition, sizes, and shapes. It has the potential for creating nanocomposites with novel functions.
Collapse
Affiliation(s)
- Ming Pan
- Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States
| | - Xinjian Shi
- Department of Mechanical Engineering, Stanford University , Stanford, California 94305, United States
| | - Fengjiao Lyu
- Department of Mechanical Engineering, Stanford University , Stanford, California 94305, United States
| | - Ben Louis Levy-Wendt
- Department of Mechanical Engineering, Stanford University , Stanford, California 94305, United States
| | - Xiaolin Zheng
- Department of Mechanical Engineering, Stanford University , Stanford, California 94305, United States
| | - Sindy K Y Tang
- Department of Mechanical Engineering, Stanford University , Stanford, California 94305, United States
| |
Collapse
|
45
|
Kim HJ, Bae SH, Kim HJ, Kim KM, Song JH, Go MR, Yu J, Oh JM, Choi SJ. Cytotoxicity, Intestinal Transport, and Bioavailability of Dispersible Iron and Zinc Supplements. Front Microbiol 2017; 8:749. [PMID: 28503169 PMCID: PMC5408065 DOI: 10.3389/fmicb.2017.00749] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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: 03/13/2017] [Accepted: 04/11/2017] [Indexed: 12/05/2022] Open
Abstract
Iron or zinc deficiency is one of the most important nutritional disorders which causes health problem. However, food fortification with minerals often induces unacceptable organoleptic changes during preparation process and storage, has low bioavailability and solubility, and is expensive. Nanotechnology surface modification to obtain novel characteristics can be a useful tool to overcome these problems. In this study, the efficacy and potential toxicity of dispersible Fe or Zn supplement coated in dextrin and glycerides (SunActive FeTM and SunActive ZnTM) were evaluated in terms of cytotoxicity, intestinal transport, and bioavailability, as compared with each counterpart without coating, ferric pyrophosphate (FePP) and zinc oxide (ZnO) nanoparticles (NPs), respectively. The results demonstrate that the cytotoxicity of FePP was not significantly affected by surface modification (SunActive FeTM), while SunActive ZnTM was more cytotoxic than ZnO-NPs. Cellular uptake and intestinal transport efficiency of SunActive FeTM were significantly higher than those of its counterpart material, which was in good agreement with enhanced oral absorption efficacy after a single-dose oral administration to rats. These results seem to be related to dissolution, particle dispersibility, and coating stability of materials depending on suspending media. Both SunActiveTM products and their counterpart materials were determined to be primarily transported by microfold (M) cells through the intestinal epithelium. It was, therefore, concluded that surface modification of food fortification will be a useful strategy to enhance oral absorption efficiency at safe levels.
Collapse
Affiliation(s)
- Hyeon-Jin Kim
- Division of Applied Food System, Major of Food Science and Technology, Seoul Women's UniversitySeoul, South Korea
| | - Song-Hwa Bae
- Division of Applied Food System, Major of Food Science and Technology, Seoul Women's UniversitySeoul, South Korea
| | - Hyoung-Jun Kim
- Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei UniversityWonju, South Korea
| | - Kyoung-Min Kim
- Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei UniversityWonju, South Korea
| | - Jae Ho Song
- Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei UniversityWonju, South Korea
| | - Mi-Ran Go
- Division of Applied Food System, Major of Food Science and Technology, Seoul Women's UniversitySeoul, South Korea
| | - Jin Yu
- Division of Applied Food System, Major of Food Science and Technology, Seoul Women's UniversitySeoul, South Korea
| | - Jae-Min Oh
- Department of Chemistry and Medical Chemistry, College of Science and Technology, Yonsei UniversityWonju, South Korea
| | - Soo-Jin Choi
- Division of Applied Food System, Major of Food Science and Technology, Seoul Women's UniversitySeoul, South Korea
| |
Collapse
|
46
|
You X, Yang S, Li J, Deng Y, Dai L, Peng X, Huang H, Sun J, Wang G, He P, Ding G, Xie X. Green and Mild Oxidation: An Efficient Strategy toward Water-Dispersible Graphene. ACS Appl Mater Interfaces 2017; 9:2856-2866. [PMID: 28029764 DOI: 10.1021/acsami.6b13703] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Scalable fabrication of water-dispersible graphene (W-Gr) is highly desirable yet technically challenging for most practical applications of graphene. Herein, a green and mild oxidation strategy to prepare bulk W-Gr (dispersion, slurry, and powder) with high yield was proposed by fully exploiting structure defects of thermally reduced graphene oxide (TRGO) and oxidizing radicals generated from hydrogen peroxide (H2O2). Owing to the increased carboxyl group from the mild oxidation process, the obtained W-Gr can be redispersed in low-boiling solvents with a reasonable concentration. Benefiting from the modified surface chemistry, macroscopic samples processed from the W-Gr show good hydrophilicity (water contact angle of 55.7°) and excellent biocompatibility, which is expected to be an alternative biomaterial for bone, vessel, and skin regeneration. In addition, the green and mild oxidation strategy is also proven to be effective for dispersing other carbon nanomaterials in a water system.
Collapse
Affiliation(s)
- Xiaofei You
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Siwei Yang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Jipeng Li
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine , Shanghai 200011, People's Republic of China
| | - Yuan Deng
- Department of Ophthalmology, Shanghai Ninth People's Hospital, Shanghai Jiaotong University School of Medicine , Shanghai 200011, People's Republic of China
| | - Lianqi Dai
- Zhejiang CHINT Cable Company, Ltd. , Zhejiang 314006, People's Republic of China
| | - Xiong Peng
- Zhejiang CHINT Cable Company, Ltd. , Zhejiang 314006, People's Republic of China
| | - Haoguang Huang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Jing Sun
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
| | - Gang Wang
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
| | - Peng He
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Guqiao Ding
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Xiaoming Xie
- State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences , 865 Changning Road, Shanghai 200050, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| |
Collapse
|
47
|
Maeda S, Fujita M, Idota N, Matsukawa K, Sugahara Y. Preparation of Transparent Bulk TiO 2/PMMA Hybrids with Improved Refractive Indices via an in Situ Polymerization Process Using TiO 2 Nanoparticles Bearing PMMA Chains Grown by Surface-Initiated Atom Transfer Radical Polymerization. ACS Appl Mater Interfaces 2016; 8:34762-34769. [PMID: 27998123 DOI: 10.1021/acsami.6b10427] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Transparent TiO2/PMMA hybrids with a thickness of 5 mm and improved refractive indices were prepared by in situ polymerization of methyl methacrylate (MMA) in the presence of TiO2 nanoparticles bearing poly(methyl methacrylate) (PMMA) chains grown using surface-initiated atom transfer radical polymerization (SI-ATRP), and the effect of the chain length of modified PMMA on the dispersibility of modified TiO2 nanoparticles in the bulk hybrids was investigated. The surfaces of TiO2 nanoparticles were modified with both m-(chloromethyl)phenylmethanoyloxymethylphosphonic acid bearing a terminal ATRP initiator and isodecyl phosphate with a high affinity for common organic solvents, leading to sufficient dispersibility of the surface-modified particles in toluene. Subsequently, SI-ATRP of MMA was achieved from the modified surfaces of the TiO2 nanoparticles without aggregation of the nanoparticles in toluene. The molecular weights of the PMMA chains cleaved from the modified TiO2 nanoparticles increased with increases in the prolonging of the polymerization period, and these exhibited a narrow distribution, indicating chain growth controlled by SI-ATRP. The nanoparticles bearing PMMA chains were well-dispersed in MMA regardless of the polymerization period. Bulk PMMA hybrids containing modified TiO2 nanoparticles with a thickness of 5 mm were prepared by in situ polymerization of the MMA dispersion. The transparency of the hybrids depended significantly on the chain length of the modified PMMA on the nanoparticles, because the modified PMMA of low molecular weight induced aggregation of the TiO2 nanoparticles during the in situ polymerization process. The refractive indices of the bulk hybrids could be controlled by adjusting the TiO2 content and could be increased up to 1.566 for 6.3 vol % TiO2 content (1.492 for pristine PMMA).
Collapse
Affiliation(s)
- Satoshi Maeda
- Department of Applied Chemistry, School of Science and Engineering, Waseda University , 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Masato Fujita
- Department of Applied Chemistry, School of Science and Engineering, Waseda University , 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
| | - Naokazu Idota
- Kagami Memorial Research Institute for Materials Science and Technology, Waseda University , 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo 169-0051, Japan
| | - Kimihiro Matsukawa
- Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Yoshiyuki Sugahara
- Department of Applied Chemistry, School of Science and Engineering, Waseda University , 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan
- Kagami Memorial Research Institute for Materials Science and Technology, Waseda University , 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo 169-0051, Japan
| |
Collapse
|
48
|
Abstract
The unsaturated "dangling" bonds on the surface of nanomaterials are extremely sensitive to the external environment, which gives nanomaterials a dual nature, i.e., high reactivity and poor stability. However, studies on the long-term effects of stability and reactivity of nanomaterials under practical conditions are rarely found in the literature and lag far behind other research. Furthermore, the long-term effects on the stability and reactivity of a nanomaterial without coating under practical conditions are seriously long-neglected. Herein, by choosing copper nanowire as an example, we systematically study the stability of copper nanowires (CuNWs) in the liquid and gas phase by monitoring the change of morphology, phase, and valence state of CuNWs during storage. CuNWs exhibit good dispersibility and durable chemical stability in polar organic solvents, while CuNWs stored in water or nonpolar organic solvents evolve into a mace-like structure. Additionally, fresh CuNWs are oxidized into CuO nanotubes with thin shells by heating in air. The activation energies of oxidation of CuNWs in the gas phase are determined by the Kissinger method. More importantly, the different oxidation pathways have significant effects on the final morphology, surface area, phase, optical absorption, band gap, and vibrational property of the oxidation products. Understanding the stability and reactivity of Cu nanostructures will add value to their storage and applications. This work emphasizes the significant issue on the stability of nanostructures, which should be taken into account from the viewpoint of their practical application.
Collapse
Affiliation(s)
- Liang Xu
- Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, CAS Center for Excellence in Nanoscience, Hefei Science Center of CAS, University of Science and Technology of China , Hefei 230026, China
| | - Yuan Yang
- Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, CAS Center for Excellence in Nanoscience, Hefei Science Center of CAS, University of Science and Technology of China , Hefei 230026, China
| | - Zeng-Wen Hu
- Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, CAS Center for Excellence in Nanoscience, Hefei Science Center of CAS, University of Science and Technology of China , Hefei 230026, China
| | - Shu-Hong Yu
- Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, CAS Center for Excellence in Nanoscience, Hefei Science Center of CAS, University of Science and Technology of China , Hefei 230026, China
| |
Collapse
|
49
|
Chang H, Luo J, Bakhtiary Davijani AA, Chien AT, Wang PH, Liu HC, Kumar S. Individually Dispersed Wood-Based Cellulose Nanocrystals. ACS Appl Mater Interfaces 2016; 8:5768-5771. [PMID: 26901421 DOI: 10.1021/acsami.6b00094] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Good dispersion of cellulose nanocrystals (CNCs) in the polymer matrix is one of the key factors to obtaining good properties in the resulting nanocomposites. However, the preparation of individually dispersed CNCs in solvents or in polymer matrices has been a challenge. In this study, individually dispersed wood-based CNCs have been successfully prepared in solvents, including dimethylformamide (DMF), H2O, and a mixture of H2O/DMF, by sonication of moisture-containing CNCs. The CNCs dispersions were characterized by dynamic light scattering (DLS). It is found that CNCs containing above about 3.8 wt % moisture is critical for achieving individually dispersed CNC in solvents. Hydrodynamic radius (Rh) of CNCs is smaller in H2O/DMF co-solvent mixture than that in pure DMF or in pure H2O under same sonication treatment conditions. Experimental results have been corroborated using molecular simulation study.
Collapse
Affiliation(s)
- Huibin Chang
- School of Materials Science and Engineering and ‡Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Jeffrey Luo
- School of Materials Science and Engineering and ‡Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Amir A Bakhtiary Davijani
- School of Materials Science and Engineering and ‡Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - An-Ting Chien
- School of Materials Science and Engineering and ‡Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Po-Hsiang Wang
- School of Materials Science and Engineering and ‡Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - H Clive Liu
- School of Materials Science and Engineering and ‡Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| | - Satish Kumar
- School of Materials Science and Engineering and ‡Renewable Bioproducts Institute, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| |
Collapse
|
50
|
Liu Y, Wang X, Wang W, Li B, Wu P, Ren M, Cheng Z, Chen T, Liu X. One-Step Preparation of Oxygen/Fluorine Dual Functional MWCNTs with Good Water Dispersibility by the Initiation of Fluorine Gas. ACS Appl Mater Interfaces 2016; 8:7991-7999. [PMID: 26950382 DOI: 10.1021/acsami.5b12647] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
It is still a challenge to prepare water-dispersible carbon nanotubes which are proved to have great potential in numerous applications. In this present work, as low as 2% fluorine gas was used as initiator to prepare oxygen/fluorine dual functional MWCNTs (OF-MWCNTs) with good water dispersibility through a one-step method under oxygen atmosphere. The aromatic structure of OF-MWCNTs is reserved to some extent resulting in better electrical conductivity than pure fluorinated MWCNTs (F-MWCNTs). The amount of oxygen atoms and fluorine atoms (hereinafter referred to as "O-content" and "F-content") of OF-MWCNTs is up to 8.8% and 7.5%. Fourier transform infrared spectroscopy (FTIR) manifests that - COOH is covalently bonded onto the surface of OF-MWCNTs. In addition, the OF-MWCNTs sample is pH-sensitive, which further validates the successful introduction of -COOH. The successful covalent attachment of -COOH onto MWCNTs dramatically improves the hydrophilia of MWCNTs which always present hydrophobic character. It is deduced that fluorine creates reactive sites for oxygen, increases the oxygen content, and eventually results in the dispersibility of OF-MWCNTs in water. The corresponding hydrophilic OF-MWCNTs film shows good performance for separating oil-in-water emulsions. Meanwhile, the good dispersibility of OF-MWCNTs in organic solvents also makes it possible to be applied in various composites.
Collapse
Affiliation(s)
- Yang Liu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| | - Xu Wang
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| | - Weimiao Wang
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| | - Baoyin Li
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| | - Peng Wu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| | - Mengmeng Ren
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| | - Zheng Cheng
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| | - Teng Chen
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| | - Xiangyang Liu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Material and Engineering, Sichuan University , Chengdu 610065, People's Republic of China
| |
Collapse
|