CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wei Jin,Aiyun Li,Yuanyang Li,Yuanying Yu,Jie Shen,Jing Zhou,Wen Chen
To achieve polytetrafluoroethylene (PTFE)-based composites for high-frequency applications with low dielectric constant, low dielectric loss tangent and low coefficient of thermal expansion (CTE), a novel pentafluorostyrene (PFS) interface modifier was used to achieve excellent performance for SiO 2 /PTFE composite materials. The effects of PFS modification on the microstructure, dielectric properties and thermal properties of SiO 2 /PTFE composites were investigated. It is found that the use of PFS greatly improves the interfacial compatibility of the composites, on the one hand the dielectric properties are effectively improved, on the other hand the steric resistance of PTFE matrix is enhanced and the CTE is reduced. When the PFS content of 5 wt%, the CTE of SiO 2 /PTFE is reduced to 86 ppm/°C. The dielectric loss of the composites varies from 0.71 × 10 −3 to 1.53 × 10 −3 at frequencies from 5 to 40 GHz. The composites also show stable dielectric properties across the applied temperature (0–150 °C). Benefiting from the high density and uniform microstructure of the PFS-modified composite, enabling it to withstand higher frequency and temperature applications.
研究领域:
材料科学
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电子材料
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产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 3
·569
·
IF 3.4
Lei Fan,Bo Li,Yan Wang,Jinhang He,Jie Bai,Tao Zhu,Yuan Yuan
The icing of glass insulators is likely to cause faults such as insulator flashover, which poses a serious threat to the power system. Traditional deicing techniques have the disadvantage of being costly and inefficient. Herein, polytetrafluoroethylenes (PTFEs) as nanoparticles and epoxy and fluorosilicone resins as binders were blended to construct an anti-icing coating. The superhydrophobic (SHP) epoxy/fluorosilicone/PTFE coatings for anti-icing were successfully prepared on glass slides through one-step spraying. The effect of PTFE mass fraction on the microstructure, on the wettability and on the anti-icing properties of the coatings was investigated. The results showed that the coatings with different PTFE mass fractions had different microstructures. When the PTFE mass fraction was 47.2%, the SHP coating exhibited a uniform rough structure with an apparent contact angle as high as 164.7° and a sliding angle as low as 3.2°. Moreover, the water droplets can bounce back five times with a contact time of only 9.5 ms and a rebound height of 4.58 mm. In the low-temperature environment (−10 °C), the SHP coating displayed good anti-frosting, anti-icing and icephobic properties. The delayed frosting time (1499 s) and delayed freezing time (1295.3 s) of the SHP coating were three and five times longer than those of the glass, respectively. The SHP coating presented an ice-adhesion strength (39.8 kPa) that was six times lower than that of glass. The prepared SHP coating demonstrated potential applications for the anti-icing of glass insulators.Keywords:superhydrophobic;PTFE;spraying;anti-icing
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Jingying Su,Fenghua Su,Han Yu,Zeqi Lin,Jianfang Sun
Superhydrophobic (SHP) materials have great potential for applications in self-cleaning, anti-fouling, anti-corrosion and drag reduction, but their poor mechanical robustness is a fundamental problem that hinders their practical application. In this work, we successfully and rapidly prepared SHP coating with good durability and drag reduction properties by a simple drop-coating technique after chemical modification and physical mixing. We investigated the effects of modification with 1H,1H,2H,2H-Perfluorodecyltriethoxysilane (FAS-17), a low surface free energy material, and the filling content of Poly tetra fluoroethylene (PTFE) on the hydrophobic property of the as-prepared coating. The maximum water contact angle (WCA) and the minimum sliding angle (SA) of the coating were 160.2 ± 0.4° and 5°, respectively. The coating maintained superhydrophobicity after 4.4 m of abrasion with 400 grit sandpaper and 3 h of water impact, indicating its excellent mechanical durability. In addition, it has outstanding self-cleaning and self-repairing properties. Moreover, the coating was innovatively applied to the surface of the chute, because it remarkably reduced the adhesion between the wet foam block and the chute. These findings here provide a novel insight into the design of a robust SHP coating and suggest a new potential application in express sorting industry for drag reduction.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Hanyu Chen,Qiang Wu,liqing Ai,Dapeng Li,Shijun Long,Yiwan Huang,Xuefeng Li
Polytetrafluoroethylene (PTFE) hollow fiber membranes are a promising candidate in highly contaminated wastewater treatment and management because PTFE is intrinsically chemically inert and hydrophobic. However, low water flux and fouling (contamination due to protein attachment and accumulation), both associated with low surface energy, pose great limits in filtration efficiency and the long-term use of PTFE hollow fiber membranes. Here we report a surface engineering strategy of coating PTFE hollow fiber membranes with polyvinyl alcohol/oxidized sodium alginate (PVA/OSA) double network (DN) hydrogels via N-(2-Aminoethyl)-3-aminopropyltrimethoxysilane (AEAPTS) hydrolysis and grafting. The as-prepared PVA/OSA DN hydrogel coated PTFE hollow fiber membranes exhibited high efficiency in oil-water separation and excellent antifouling performance due primarily to the favorable interfacial electrostatic interaction and the hydration coating layer on the membrane surfaces. Moreover, the PVA/OSA DN hydrogel coatings remained high hydrophilicity and structural intergrity and operation stability after extensive time of soaking in strong acidic and alkaline solutions, all in great favor of the performance they were initially designed and intended for.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Fuxin Qiu,Yumin Sun,Yuxin Zhang,Hailiang Liu,Lu Shao,Qinglin Huang
The practical implementation of organic solvent nanofiltration (OSN) was still hindered by the drawback of substrate swelling and dissolution in organic solvents. As the substrate of nanofiltration membranes, polytetrafluoroethylene (PTFE) had gained increasing attention due to its stable chemical characteristics. However, it was difficult to construct functional nanofiltration layers on the surface of PTFE due to its hydrophobicity induced by its intrinsic low surface energy, resulting into poor adhesion between substrate and functional layer. In this study, a polydopamine (PDA)-PA/PTFE composite nanofiltration membrane with a three-layer was fabricated by utilizing the poly (tetrafluoroethylene-hexafluoropropylene) (FEP) resins as the pore structure regulator of the PTFE substrate with fiber network structure, and PDA as the surface modifier of the PTFE substrate. The resultant composite nanofiltration membrane exhibited a notable rejection rate of 96.26 % for Rose Bengal (RB), and a long-term stable ethanol permeance of 2.28 (L·m −2 ·h −1 ·bar −1 ). After continuous filtration for 48 h, soaking in polar organic solvents (DMF) for 20 days, and circulating experiments exhibiting excellent solvent resistance and long-term stability. These results provided a useful strategy for the application of PTFE nanofiber substrates in the OSN field.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
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2020
·
IF 7.098
Binglin Bai,Xiaohong Yang,Rui Tian,XuanXuan Wang,Haibo Wang
Solar steam generation has become the most promising solar-thermal applications in recent years. Scientists often focus on the search for superior materials, efficient structures, while ignoring the use of residual heat from the water at the bottom. In this paper, a membrane distillation system that utilizes residual heat was added in a new solar house of a domestic hot water and drinking water supply system in the first place. The pDA-rGO-PTFE membrane as an excellent evaporator was characterized in solar steam generation system, which possesses good hydrophilicity capacity and high intrinsic absorption properties . And at the optimal concentration of 20 mg/mL, the evaporation rate and efficiency of pDA-rGO-PTFE membrane could reach up 1.45 kg·m −2 ·h −1 and 93.8% respectively in one sun (one sun = 1kw·m −2 ). The PTFE membrane as a separator was applied in a membrane distillation system. Under average 0.66 sun in the natural environment, the average evaporation rate of a new solar house could reach about 1.10 kg·m −2 ·h −1 , and there is an additional 0.71 kg·m −2 ·h −1 membrane permeation flux by the residual heat. In addition, the new solar house showed an excellent durability and desalination ability, the ions rejection rations of the collected condensate water were close to 99.8%. Hence, we conclude that further ideas of a new solar house were provided for solving water scarcity, domestic water consumption and the application of solar steam generation in the future.
研究领域:
能源科学
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环境工程
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材料科学
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可持续技术
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水处理技术
✓ 已验证
DOI
高影响因子
Journal of Manufacturing Processes
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2025
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IF 6.8
Xuesong Jiang,Jimin Chen,Yong Zeng
Polytetrafluoroethylene (PTFE) has become an important engineering polymer due to its unparalleled chemical inertness and wide operating temperature range. In this study, complex, intricate, and high-performance PTFE components were prepared using Vat Photopolymerization (VPP) technology, and their composition design and microstructural evolution were investigated. Additionally, the effects of heat treatment processes and cooling rates on mechanical properties were further analyzed. When the sintering temperature was 410 °C, the holding time was 90 min, and the cooling rate was 3 °C/min, the density of PTFE reached 99.8 % of traditionally processed PTFE parts, while achieving excellent mechanical properties, with a tensile strength of 25.3 ± 0.2 MPa and an elongation at break of 224± 5 %. Furthermore, the tensile strengths at −150 °C and + 150 °C were 49.2 ± 4.3 MPa and 5.9 ± 3.0 MPa. Subsequently, the mechanical properties of TPMS with different structures and porosities were investigated under high and low temperatures. At room temperature, the compressive strength at 10 % deformation ranged from 1.2 to 4.3 MPa for different minimum surface areas. Under low-temperature conditions (−150 °C, −80 °C), the stiffness and strength of the PTFE structure significantly increased, with compressive strength at 10 % strain ranging from 5.3 to 15.4MPa, indicating a shift in the failure mechanism due to increased material brittleness. Conversely, high temperatures (+200 °C, +150 °C) cause PTFE to soften significantly, with compressive strength ranging from 0.4 to 1.1MPa at 10 % strain, and a substantial decrease in stiffness and strength, reflecting highly plastic deformation behavior.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2018
·
IF 6.759
Yihu Dai,Xing Gao,Xiaofang Chu,Chunyang Jiang,Yao Yao,Zhen Guo,Chunmei Zhou,Chuan Wang,Hongming Wang,Yanhui Yang
A series of carbon nanotube (CNT)-supported bimetallic PtFe nanoparticles were synthesized and employed as catalysts for hydrogenation of cinnamaldehyde in pure water. A synergy between water and bimetallic PtFe catalysts has allowed the efficiently selective production of cinnamyl alcohol. With the aid of water, an initial reaction rate of >1200 h −1 and a high selectivity of >97%, as well as a good cycling stability, were achieved with a Pt 3 Fe/CNT catalyst under mild reaction conditions. Isotopic labeling studies and theoretic calculation results demonstrated that the water-involved hydrogen-exchange pathway occurred with a lower energy barrier, which coexisted with the pathway of direct H 2 dissociation–hydrogenation. This work also suggested that water participated in the catalytic hydrogenation reaction by serving as a hydrogen-exchange bridge.
研究领域:
催化化学
·
绿色化学
✓ 已验证
DOI
高影响因子
Science Advances
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2025
·Vol. 11
·期 25
·
IF 12.5
Yang Gao,Daming Liu,Jing Zhou,Wen Zhang,Danqi Sun,Shuyang Wang,Yipeng Yang,Yuchen Xiang,Yang Zhang,Wei Lei,Tongqing Lu
Expanded polytetrafluoroethylene (e-PTFE) is extensively used in medical implants for its excellent bioinertness. Existing methods to fix e-PTFE implants on host tissues mainly use invasive anchorage such as sutures, spiral tacks, or metal skeletons, which has limitations such as being time-consuming and causing leakage and tissue damage. To overcome these limitations, we introduce a bioadhesive interface to realize the adhering fixation of e-PTFE implants. We integrate a hydrophilic and bioadhesive hydrogel layer on the hydrophobic and bioinert e-PTFE by designing a facile approach of freezing-induced micromechanical interlocking. The integration is robust enough as pulling hydrogel out of the interlocked pores on e-PTFE requires large energy dissipation. This bioadhesive interface enables instant (operating time < 10 seconds) and secure (adhesion energy >200 joules per square meter) adhering fixation of e-PTFE implants to wet tissue. The advantages for reducing inflammatory response, fibrogenesis, and the resultant postoperative adhesion are further demonstrated in a reconstructive surgery of an abdominal wall defect in rabbits.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Yuan Liu,Zheyi Meng,Rujia Zou,Liping Zhu,Xuefen Wang,Meifang Zhu
Membrane distillation (MD) has emerged as a promising technology for desalination and concentration of hypersaline brine. However, the efficient preparation of a structurally stable and salinity-resistant membrane remains a significant challenge. In this study, an amphiphobic polytetrafluoroethylene nanofibrous membrane (PTFE NFM) with exceptional resistance to scaling has been developed, using an energy-efficient method. This innovative approach avoids the high-temperature sintering treatment, only involving electrospinning with PTFE/PVA emulsion and subsequent low-temperature crosslinking and fluorination. The impact of the PVA and PTFE contents, as well as the crosslinking and subsequent fluorination on the morphology and MD performance of the NFM, were systematically investigated. The optimized PTFE NFM displayed robust amphiphobicity, boasting a water contact angle of 155.2º and an oil contact angle of 132.7º. Moreover, the PTFE NFM exhibited stable steam flux of 52.1 L·m −2 ·h −1 and 26.7 L·m −2 ·h −1 when fed with 3.5 wt % and 25.0 wt % NaCl solutions, respectively, and an excellent salt rejection performance (99.99 %, ΔT = 60 °C) in a continuous operation for 24 h, showing exceptional anti-scaling performance. It also exhibited stable anti-wetting and anti-fouling properties against surfactants (sodium dodecyl sulfate) and hydrophobic contaminants (diesel oil). These results underscore the significant potential of the PTFE nanofibrous membrane for practical applications in desalination, especially in hypersaline or polluted aqueous environments.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Azim Abdullaev,Fujian Liu,Kun Peng,Yujie You,Kehan Qu,MD Zahidul Islam,Yinsong Si,Yaqin Fu
The development of advanced dielectric materials is integral to improving the performance of high-frequency telecommunication devices. Developing composite membranes that effectively balance superior dielectric properties, high thermal stability, mechanical strength, and other key characteristics for practical applications remains a significant challenge. This study presents the fabrication of a nanocomposite membrane, combining polyimide (PI) and polytetrafluoroethylene (PTFE) within a PI matrix, designed for dielectric applications. The PI/PTFE@PI nanocomposite membranes were fabricated through electrospinning and dip-coating techniques. These membranes exhibited dielectric constants between 1.64 and 1.99 at 10 GHz, accompanied by a low dielectric loss, ranging from 0.001 to 0.009. Dielectric breakdown strengths varied between 108.38 and 169.44 kV/mm. Mechanical properties included a tensile strength of 26.81 MPa and a Young's modulus of 858 MPa. Thermal stability tests showed a maximum thermal degradation temperature ( T max ) of 659 °C and a 5% weight loss temperature ( T d5% ) of 450 °C for pure PI composite membranes. The PI/PTFE@PI-40% composite membrane demonstrated a water contact angle of 110.8° and a water absorption rate of 0.5%, indicating its suitability as a potential dielectric material for telecommunication applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 8
·1154
·
IF 4.7
Mingpeng Hou,Qiuying Li,Yanchao Che
Polytetrafluoroethylene (PTFE) capillary membranes, known for the great chemical resistance and thermal stability, are commonly used in membrane separation technologies. However, the strong hydrophobic property of PTFE limits its application in water filtration. This study introduces a method whereby acrylamide (AM), N, N-methylene bisacrylamide (MBA), and vinyltriethoxysilane (VTES) undergo free radical copolymerization, followed by the hydrolysis-condensation of silane bonds, resulting in the formation of hydrophilic three-dimensional networks physically intertwined with the PTFE capillary membranes. The modified PTFE capillary membranes prepared through this method exhibit excellent hydrophilic properties, whose water contact angles are decreased by 24.3–61.2%, and increasing pure water flux from 0 to 1732.7–2666.0 L/m2·h. The enhancement in hydrophilicity of the modified PTFE capillary membranes is attributed to the introduction of hydrophilic groups such as amide bonds and siloxane bonds, along with an increase in surface roughness. Moreover, the modified PTFE capillary membranes exhibit chemical resistance, maintaining the hydrophilicity even after immersion in strong acidic (3 wt% HCl), alkaline (3 wt% NaOH), and oxidative (3 wt% NaClO) solutions for 2 weeks. In conclusion, this promising method yields modified PTFE capillary membranes with great hydrophilicity and chemical resistance, presenting substantial potential for applications in the field of water filtration.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）