OPTIK
·
2020
·
IF 2.187
Xiaoyu Sun,Lei Li,Xiaozhuang Xu,Guanyu Song,Jielei Tu,Pingyuan Yan,Weinan Zhang,Kai Hu
Reflection from the surface of solar panels is important factor to limit the efficiency of all of photovoltaic devices . Antireflective coatings (ARCs) can significantly reduce surface reflections and improve photovoltaic module efficiency. But, ARCs on solar glass, used in photovoltaic (PV) modules, usually located in terrible environments, which demands that ARCs must hinder moisture penetration , abrasion damage, and dirt accumulation. In this study, the films with highly antireflective properties that maintains a high durability and hydrophobic were prepared through a simple sol–gel method by using PTFE (Polytetrafluoroethylene) modified. The average transmittance of glass with ARCs was 97.86 % at 400–800 nm, which was an increase of 7.86 % compared to the bare glass. X-ray Diffraction (XRD), Fourier Transform Infrared spectrometer (FT-IR), field emission scanning electron microscope (FE-SEM), ellipsometer , atomic force microscope (AFM), UV–vis-NIR spectrophotometer and water contact angle analyzer were used to measure the surface composition, morphology, refractive index , surface roughness , optical and hydrophilic properties of the coatings. The results revealed that the deposition of PTFE modified SiO 2 coating on the glass substrate had a significant enhance on the antireflection, abrasion-resistance and hydrophobic property.
研究领域:
材料科学
·
太阳能
·
涂层技术
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Xiao Zhu,Shasha Feng,Shuaifei Zhao,Feng Zhang,Chong Xu,Min Hu,Zhaoxiang Zhong,Weihong Xing
Polytetrafluoroethylene (PTFE) nanofiber membranes have been widely used in various air purification applications attributed to their excellent thermal and chemical stabilities. However, in oily fume purification, oil aerosols can easily permeate through the oleophilic membrane, which may lead to pore blocking, and increased filtration resistance and energy consumption, finally reducing the filtration efficiency and lifespan of the membrane. Herein, we report a hierarchical SiO 2 @PTFE nanofiber membrane by coaxial electrospinning of SiO 2 nanoparticle dispersion as the shell spinning solution and PTFE emulsion as the core spinning solution, followed by in-situ surface grafting of 1H,1H,2H,2H-perfluorooctyltrimethoxysilane. The prepared amphiphobic membrane has both superhydrophobicity and oleophobicity with the water and oil contact angles of 173° and 134°, respectively. It possesses uniform pore structures , high gas permeability (697 m 3 m −2 h −1 kPa −1 ), excellent oily fume filtration efficiency (˃99%), as well as a low pressure drop (2.5 kPa) during 60-min filtration. Furthermore, our perfluorinated amphiphobic SiO 2 @PTFE nanofiber membrane exhibits good reusable and stable properties. This work opens a versatile approach to design efficient functionalized membranes in the field of oily fume purification.
研究领域:
材料科学
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环境工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
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
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Fengzhen Gao,Junxuan Liang,Faying Fan,Rui Wang,Benshuai Jiang,Kewei Zhang
Electrochemical gas sensors (EGSs) are the most effective means for detecting NO 2 gas in industry, while facing the issue of exorbitant cost due to the use of expensive Pt catalyst. Herein, well-dispersed C-SiO 2 into polytetrafluoroethylene (PTFE) was adopt as high-stable gas diffusion membrane for ultrafast electrochemical NO 2 sensors. The nano-SiO 2 not only prevents material aggregation but also constructs porous networks between the gas diffusion electrode and gas molecules, providing a larger sensing area for high sensor performance. The fabricated sensor exhibits excellent response linearity, short response time, and high stability. As compared with commercial Pt/C electrode, the sensor response is improved by 170 %. Moreover, a multiple linear regression model was introduced to predict the response values of NO 2 in the range of 5–100 ppm, achieving only 1.5 % deviation from the real values. This work not only demonstrates the feasibility of non-precious metals in gas diffusion membranes but also provides guide for designing next-generation low-cost EGSs.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 24
·7853
·
IF 3.623
Yan Luo,Zhongyun Shen,Zhihao Ma,Hongfeng Chen,Xiaodong Wang,Minger Luo,Ran Wang,Jianguo Huang
A silicon dioxide/polytetrafluoroethylene/polyethyleneimine/polyphenylene sulfide (SiO2/PTFE/PEI/PPS) composite filter medium with three-dimensional network structures was fabricated by using PPS nonwoven as the substrate which was widely employed as a cleanable filter medium. The PTFE/PEI bilayers were firstly coated on the surfaces of the PPS fibers through the layer-by-layer self-assembly technique ten times, followed by the deposition of SiO2nanoparticles, yielding the SiO2/(PTFE/PEI)10/PPS composite material. The contents of the PTFE component were easily controlled by adjusting the number of self-assembled PTFE/PEI bilayers. As compared with the pure PPS nonwoven, the obtained SiO2/(PTFE/PEI)10/PPS composite material exhibits better mechanical properties and enhanced wear, oxidation and heat resistance. When employed as a filter material, the SiO2/(PTFE/PEI)10/PPS composite filter medium exhibited excellent filtration performance for fine particulate. The PM2.5 (particulate matter less than 2.5 μm) filtration efficiency reached up to 99.55%. The superior filtration efficiency possessed by the SiO2/(PTFE/PEI)10/PPS composite filter medium was due to the uniformly modified PTFE layers, which played a dual role in fine particulate filtration. On the one hand, the PTFE layers not only increase the specific surface area and pore volume of the composite filter material but also narrow the spaces between the fibers, which were conducive to forming the dust cake quickly, resulting in intercepting the fine particles more efficiently than the pure PPS filter medium. On the other hand, the PTFE layers have low surface energy, which is in favor of the detachment of dust cake during pulse-jet cleaning, showing superior reusability. Thanks to the three-dimensional network structures of the SiO2/(PTFE/PEI)10/PPS composite filter medium, the pressure drop during filtration was low.Keywords:polytetrafluoroethylene;polyphenylene sulfide;filter medium;PM2.5;layer-by-layer self-assembly
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Meng Liu,Xinyu Tan,Xinyi Li,Jialin Geng,Mengmeng Han,Ke Wei,Xiaobo Chen
Superhydrophobic coatings have aroused increasing interest in many fields. However, the low light transmittance , poor mechanical robustness, and unsatisfactory chemical stability greatly limit the practical application of superhydrophobic coatings. Herein, a robust transparent superhydrophobic coating was prepared through a facile two-step dipping treatment. The coated glass displays good transparency with transmittance about 87 % in the wavelength range of 500–900 nm, remarkable superhydrophobic performance with a water contact angle of 158.8° and a sliding angle less than 1.0°. After a series of durability tests, including grit impact, etching in acidic and alkaline environments, and long-term outdoor exposure, the obtained coating can still maintain good superhydrophobic and transparency, which confirms the obtained coating has good mechanical robustness and chemical stability. Moreover, the coating exhibits good anti-icing property with a longer icing time and can maintain superhydrophobicity after 80 icing/de-icing cycles. It can be believed that such transparent superhydrophobic coating can be applied in many fields, owing to its low-cost and environmentally friendly fabrication method and its good performances in mechanical robustness and chemical stability.
研究领域:
材料科学
·
表面工程
✓ 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）