INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Chong Xu,Jian Fang,Ze-Xian Low,Shasha Feng,Min Hu,Zhaoxiang Zhong,Weihong Xing
Synthetic expanded polytetrafluoroethylene (ePTFE) membrane has a wide range of applications, including aerosol and dust removal, and exhibits high dust-removing efficiency, high air permeability, and cost-effectiveness. However, the intrinsic oleophilic surface of ePTFE limits its application in the oil-bearing gas–solid separation process. Herein, we report a surface modification method to prepare amphiphobic ePTFE membranes via coating of a layer of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane (PFTMS) – modified nano-SiO2 onto the surface of ePTFE fibers. The oil contact angle of the modified ePTFE membranes was increased from 0 to 123°, while retaining the initial water contact angle of 142°. The amphiphobic membrane shows excellent oil aerosol filtration efficiency with a comparative low pressure drop and high oil rejection rate of 99.5%. Remarkably, the membrane can be reused after simple rinsing with water. The oil aerosol filtration efficiency of membrane remained as high as 98.5% after five cycles of filtration and cleaning.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 7
·1246
·
IF 3.06
Xingzhong Guo,Shengchi Bai,Jiaqi Shan,Wei Lei,Ronghua Ding,Yun Zhang,Hui Yang
With methylsilsesquioxane (MSQ) aerogels synthesized by the sol-gel method as a raw material and Si-Ti sol as a binder, an alcohol-based aerogel slurry consisting of only MSQ aerogel and Si-Ti sol was prepared and coated on expanded polytetrafluoroethylene (ePTFE) to form an MSQ aerogel coating layer, followed by low-temperature heat treatment. The effect of Si-Ti sol content on the microstructure of the MSQ aerogel coating layer was investigated, and the properties of a typical MSQ aerogel-layer-coated ePTFE film were evaluated. The results show that Si-Ti sol has an important role in terms of film-forming capability, surface smoothness, flexibility, and powder dropping of the MSQ aerogel coating layer. With a Si-Ti sol of 10.5 wt.% content as a binder and after heat treatment at 170 °C for 30 min, the coated ePTFE flexible thin film with a layer thickness of 30 μm shows high uniformity, integrity, and electrical insulation properties, with an elongation at break decrease over 130%, a thermal conductivity of 0.1753 W/(m·K) at 25 °C, a dielectric constant of 16.5674, and a dielectric loss of 0.06369, which can be promisingly applied in cable sheaths.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 36
·7409-7422
·
IF 6.331
Zheng Xing,Shuting Wu,Chen Zhao,Yating Bai,Dawei Jin,Meng Yin,Haifeng Liu,Yubo Fan
Cardiovascular disease (CVD) poses serious health concerns worldwide. The lack of transplantable vascular grafts is an unmet clinical need in the surgical treatment of CVD. Although expanded polytetrafluoroethylene (ePTFE) vascular grafts have been used in clinical practice, a low long-term patency rate in small-diameter transplantation application is still the biggest challenge. Thus, surface modification of ePTFE is sought after. In this study, polydopamine (PDA) was used to improve the hydrophilia and provide immobilization sites in ePTFE. Bivalirudin (BVLD), a direct thrombin inhibitor, was used to enhance the anti-thrombotic activity of ePTFE. The peptides derived from extracellular matrix proteins were used to elevate the bioactivity of ePTFE. The morphology, chemical composition, peptide modified strength, wettability, and hemocompatibility of modified ePTFE vascular grafts were investigated. Then, an endothelial cell proliferation assay was used to evaluate the best co-modification strategy of the ePTFE vascular graft in vitro. Since a large animal could relatively better mimic human physiology, we chose a porcine carotid artery replacement model in the current study. The results showed that the BVLD/REDV co-modified ePTFE vascular grafts had a satisfactory patency rate (66.7%) and a higher endothelial cell coverage ratio (70%) at 12 weeks after implantation. This may offer an opportunity to produce a multi-biofunctional ePTFE vascular graft, thereby yielding a potent product to meet the clinical needs.
研究领域:
心血管外科
·
生物材料科学
·
组织工程
·
医学生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ARTIFICIAL ORGANS
·
2018
·Vol. 42
·期 8
·824-834
·
IF 2.111
Yaping Shan,Bing Jia,Ming Ye,Hua Shen,Weicheng Chen,Huifeng Zhang
Expanded polytetrafluoroethylene (ePTFE) prosthetic valves have been widely used in clinical applications in Asian countries. However, these valves still have limits with regard to thrombosis, neointimal hyperplasia, restenosis, and valvar vegetation. The achievement of in situ endothelialization on implant materials is a promising way to overcome those limits. Here, heparin/collagen multilayers were fabricated on ePTFE films via a layer-by-layer (LBL) self-assembly technique, and then, the endothelial cell (EC) adhesive peptide sequence Arg-Glu-Asp-Val (REDV) was immobilized on the multilayers. After modification with the heparin/collagen multilayers with or without REDV peptide, less platelet activation and aggregation were observed, the blood coagulation time was increased, and the hemolysis rate was decreased compared to that on pristine ePTFE films. The REDV-functionalized ePTFE films positively impacted early EC adhesion, later cell proliferation and cell activity. The EC barrier was confirmed to be successfully achieved on the functionalized ePTFE film surface in vitro. The successful assembly of the REDV-functionalized heparin/collagen multilayer on ePTFE films improved the blood compatibility, anticoagulant properties, and cell compatibility of the films in vitro, and thus, represents a candidate approach for applications requiring quick in situ endothelialization in vivo.
研究领域:
生物材料
·
组织工程
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Dongyan Li,Jian Hu,Ze-Xian Low,Zhaoxiang Zhong,Yong Wang
Expanded polytetrafluoroethylene (ePTFE) is one of the most common membrane materials, but the intrinsic hydrophobic nature is a major reason for deteriorating performances in water purification. In this work, the influences of atomic layer deposition (ALD) seeding and subsequent ZnO nanorod (NR) growth on the surface morphologies and water permeability of ePTFE membranes was investigated. ZnO-ALD ePTFE membrane showed an order of magnitude increase in water permeation, owing to the substantial increase in surface hydrophilicity and surface area. The best-performing ZnO NRs membrane had a pure water flux (PWF) of 1764.3 L·m–2·h–1 (compared to 153.8 L·m–2·h–1 of the pristine ePTFE membrane). Suspension filtration experiments indicate that the ZnO NRs filter showed an increase of steady-state flux of more than 5 times and an increase of 29.7% in retention compared to that of the ePTFE membrane. Significantly, the novel ZnO NR filter exhibited good photocatalytic performance as demonstrated in the degradation of methyl orange (MO) solution. Therefore, the functionalized membrane can potentially overcome the inherent limitation in the trade-off effect and imply their superiority for controlling water quality.
研究领域:
材料科学
·
环境工程
·
膜技术
·
纳米科技
·
水处理
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Linjun Wu,Zhiqiang Shen,Yuexi Zhou,Jiane Zuo
This study rigorously assessed the efficacy of gas-permeable membrane (GPM) technologies in recovering ammonia from landfill leachate, focusing on polypropylene (PP) and expanded polytetrafluoroethylene (ePTFE) membranes within in-situ (INS) and shell-tube (ST) configurations. The research spanned an array of determinants, including influencing factors, sustained operational efficiency, fouling dynamics, and recovery product purity. It was established that the INS-ePTFE configuration demonstrated formidable recovery capabilities and durable performance after fouling cleaning, with ammonia removal efficiency resurging to its initial state and stabilizing at 93 % post-maintenance. In contrast, the ST-PP configuration experienced an unrecoverable drop in removal efficiency to 83 %. Fouling analysis indicated that ePTFE membranes retained structural stability against organic and inorganic deposition, with humic substances and metal carbonates as predominant constituents. Conversely, PP membranes exhibited a decline in hydrophobic properties and structural integrity upon contamination. Furthermore, pH elevation significantly enhanced ammonia nitrogen mass transfer coefficients without increasing osmotic water transfer in INS systems. The INS system also showed promise for synergistic phosphorus recovery within the pH of 9 to 10. Then, NO 3 – , SO 4 2- and humic acid did not impede ammonia translocation, whereas a 1.5 % mass fraction of Ca 2+ incurred a roughly 30 % reduction in ammonia mass transfer coefficients across each system. The recovery of high purity (NH 4 ) 2 SO 4 attested to the exceptional retention capabilities of GPMs for organics and ions, with rejection rates surpassing 99.6 %. The comprehensive analysis underscored the operational superiority of the INS-ePTFE configuration in ammonia recovery.
研究领域:
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2026
·Vol. 33
·期 6
·233
·
IF 3.5
Zhai Fengxia,Zhuang Liqi,Wei Kaijie,Cao Fahai,Zhao Shicheng
The development of proton exchange membranes (PEMs) that combine high proton conductivity with long-term durability remains a key challenge in fuel cell technology. This study proposes a strategy that constructs multiple proton transport channels through anchoring phosphoric acid via basic groups and incorporating a phosphotungstic acid (HPW)-functionalized expanded polytetrafluoroethylene (ePTFE) framework. By immobilizing phosphoric acid (PA) through alkaline groups on the sulfonated polyimide (SPI) backbone, the composite membrane maintains high proton conductivity even under low water uptake conditions. Meanwhile, the ePTFE framework effectively suppresses membrane swelling and enhances its mechanical strength. Specifically, the reinforced composite membrane (SPIC50PA-0.22-HPW) demonstrates excellent overall performance: at 80 °C, it achieves a proton conductivity of 0.47 S/cm, a swelling ratio of only 1.6% and a methanol permeability of 0.08 × 10⁻⁶ cm²/s. Furthermore, the membrane exhibits outstanding PA retention capability, maintaining over 90% of its conductivity after 720 h of water immersion. In single-cell tests at 80 °C, the composite membrane delivers a peak power density of 212 mW/cm², outperforming Nafion 212 (186 mW/cm²). These advancements significantly enhance the potential of SPI-based PEMs in clean energy applications.
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Bikai Yang,Yijing Xing,Yizhe Li,Wenxuan Wu,Lei Liu,Haibin Li
A double-layer ePTFE-reinforced PFSA membrane (PEM-DR) was developed via solution casting to enhance the mechanical durability and vanadium ion barrier capability of membranes for vanadium redox flow batteries (VRFBs). Compared with the single-layer reinforced membrane (PEM-SR), PEM-DR exhibits markedly improved mechanical strength, reduced swelling, and enhanced dimensional stability. PEM-SR exhibits insufficient comprehensive performance and obvious cross-sectional structural defects after long-term cycling, while the dual-layer structure of PEM-DR enables uniform stress distribution during cyclic volume variation and effectively mitigates long-term cycling-induced delamination. Quantified EE outputs of 90.23 %, 84.99 % and 83.39 % are acquired for PEM-DR at 50, 100 and 150 mA cm−2 respectively; the longest cycle life is exhibited by PEM-DR, which is three times longer than those of 50 μm Nafion commercial membrane, and twice as long as that of PEM-SR. The double-layer ePTFE reinforcement effectively suppresses vanadium ion crossover and mitigates membrane deformation under cyclic mechanical stress and acidic oxidative conditions. PEM-DR delivers superior electrochemical stability, minimal capacity decay, and excellent long-term cycling performance in VRFBs. These results demonstrate that the double-layer reinforcement architecture significantly enhances membrane durability while maintaining high battery performance, providing a promising strategy for the development of advanced PEMs for durable VRFB operation.
✓ 已验证
DOI
高影响因子
ACS Applied Bio Materials
·
2024
·
IF 4.6
Haojie Wang,Rong Xu,Shuangyan She,Md Abdullah,Kai Meng,Miao Xiao,Jihua Nie,Huijing Zhao,Ke-Qin Zhang
Expanded poly(tetrafluoroethylene) (ePTFE), obtained by the paste extrusion-stretching method, is a commonly used stent membrane material for the treatment of arterial stenosis or aneurysm in clinical practice. However, the structure of ePTFE is nonfibrous, which is not friendly to cells, and the equipment consumes a lot of energy and often requires the use of flammable and toxic lubricants. In this study, electrospinning was used to prepare PTFE vascular stent membranes, following plasma treatment, dopamine, and heparin grafting to obtain an anticoagulant surface. The morphology, structure, axial and circumferential tensile strength, porosity, water penetration pressure, and heparin-releasing behaviors of the samples were studied at first. Then, the experiments of blood compatibility, cytotoxicity, and in vivo subcutaneous implantation were conducted. Results showed that the PTFE electrospun tubular membrane has submicrometer to nanoscale fiber structures similar to the extracellular matrix. The axial and circumferential tensile strengths can reach 8.12 and 6.10 MPa, respectively, and the axial and circumferential elongations at break can reach 328.75% and 285.28%, respectively. It maintains higher porosity and water penetration pressure as well as a longer heparin-releasing period. It has a suitable hemolysis rate and superior anticoagulant properties. Dopamine and heparin modifications can facilitate the adhesion and proliferation of endothelial cells. Histological analysis of the PTFE electrospun tubular membrane showed no difference from the commercially available ePTFE graft.
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Fangqi Zhou,Hongjia Zhou,Qun Zhou,Ze-Xian Low,Yutang Kang,Shasha Feng,Zhaoxiang Zhong,Weihong Xing
Membranes with amphiphobic properties have shown significant advantages in the filtratimon of oily fumes, yet achieving stable, large-scale production of composite amphiphobic membranes still poses significant challenges. Herein, we present a scalable approach for the development of amphiphobic coatings for creating asymmetrically structured expanded polytetrafluoroethylene/polyphenylene sulfide (ePTFE/PPS) composite membranes. By adopting spray coating and UV curing, the amphiphobic coatings constructed on the ePTFE and PPS sides exhibited contact angles of 149° and 157° for corn oil and hexadecane, respectively. During a 100-h oil mist filtration test, the membrane maintained an oil interception rate above 99.7 %, and the filtration pressure drop decreased by 49 % compared with that of the original membrane. Our scalable manufacturing method creates an amphiphobic design that excels in liquid drainage, making it perfect for oil mist filtration with composite membranes, which is suitable for the industrial fabrication of amphiphobic gas purification membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Shuyang Lu,Peng Zhang,Xiaoning Sun,Feirong Gong,Shouguo Yang,Li Shen,Zheyong Huang,Chunsheng Wang
An anti-CD133 antibody multilayer functionalized by heparin/collagen on an expanded polytetrafluoroethylene (ePTFE) graft was developed to accelerate early endothelialization. The surface modification of ePTFE grafts demonstrated that the multilayer is stable in static incubation and shaking conditions and that the anti-CD133 antibodies were successfully cross-linked onto the surface. Blood compatibility tests revealed that the coimmobilized heparin/collagen films in the presence or absence of anti-CD133 antibodies prolonged the blood coagulation time and that there was less platelet activation and aggregation, whereas the hemolysis rate was comparable with the bare ePTFE grafts. Cellular proliferation was not inhibited, as the heparin/collagen synthetic vascular grafts coated with CD133 antibody showed little cytotoxicity. The endothelial cells adhered well to the modified ePTFE grafts during a cell adhesion assay. A porcine carotid artery transplantation model was used to evaluate the modified ePTFE grafts in vivo. The results of histopathological staining and scanning electron microscopy indicated that the anti-CD133 antibody was able to accelerate the attachment of vascular endothelial cells onto the ePTFE grafts, resulting in early rapid endothelialization. The success of the anti-CD133 antibody-functionalized heparin/collagen multilayer will provide an effective selection system for the surface modification of synthetic vascular grafts and improve their use in clinical applications.
研究领域:
生物材料
·
组织工程
·
血管外科
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Yudong Shi,Ying Hu,Jiabin Shen,Shaoyun Guo
Advanced functional membranes consisting of low surface energy and tailored micropores are promising materials for oil-water separation applications. However, obtaining a high porosity yet controllable pore sizes to achieve high separation efficiency and flux remains challenging. Herein, four kinds of polytetrafluoroethylene (PTFE) powders with different particle sizes were simply sieved from a commercial resin and corresponding microporous membranes were fabricated through paste extrusion and thermal stretching processes. The microporous structure exhibited that choosing smaller powders caused the decrease of pore size but can still maintain a high porosity in stretched membranes, which was difficult to be realized by controlling processing conditions. The increased contact interfaces among small powders were regarded to promote the fibrillation during extrusion, thereby more entangled sites of fibrils were generated and only required a small amount of extension to get the target deformation during stretching. Consequently, more micropores with a smaller size were owned in the membrane by using smaller powders, which gave rise to superhydrophobicity with an ultrahigh water contact angle of 152° and superfast oil infiltration . As expected, the oil-water separation experiment obtained high separation efficiency closing 100% and the flux of 7500 L/m 2 ·h, which were competitive in comparison to most of previously-reported PTFE microporous membranes. More significantly, such an outstanding separation capacity was suitable for many kinds of oils with different densities and almost stable even after 15 cycles. Meanwhile, the microporous structure of the membrane prepared by using smaller powders was also proven to be deformed more slowly when subjected to a large strain. Accordingly, this work provides a new and practical approach for fabricating PTFE microporous membranes suitable for applying in a wide variety of oil-water separation fields.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）