JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2018
·
IF 3.235
Chunhuan Tian,Dandan Chen,Nali Lu,Yao Li,Rongjing Cui,Zhida Han,Genhua Zhang
Bimetallic nanoporous alloys have attracted considerable attention for electrochemical sensor applications due to their excellent electrocatalytic activity and structural stability. In the present work, nanoporous PtFe (NP-PtFe) alloy was fabricated by chemical dealloying ternary PtFeAl alloy ribbons. The structure and morphology of NP-PtFe alloy was characterized by scanning electronmicroscopy, transmission electron microscopy and X-ray diffraction. A highly sensitive and selective biosensor based on NP-PtFe alloy and graphene was successfully developed for direct detection of bisphenol A. Under optimal conditions, the proposed sensor showed an efficient electrocatalytic activity towards the redox of bisphenol A. Differential pulse voltammetry was applied to the electrochemical determination of bisphenol A with a wide linear concentration range from 0.2 μM to 96 μM and a low limit of detection of 0.17 μM (S/N = 3). This strategy provides a novel and simple approach for sensitive and selective detection of bisphenol A, holding promising applications in the determination of organic pollution in real water samples.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Polymers
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2018
·Vol. 10
·期 9
·966
·
IF 2.935
Dapeng Gu,Longxiao Zhang,Suwen Chen,Kefeng Song,Shouyao Liu
Polytetrafluoroethylene/Poly(methyl methacrylate) (PTFE/PMMA) composite was prepared by mixing PTFE into PMMA matrix which synthesized by the PMMA powder mixture and methyl methacrylate (MMA) liquid mixture. The effects of the filling mass ratio of PTFE and powder/liquid (P/L) ratio on the friction and wear properties of PTFE/PMMA composites against bearing steel were studied by a ball-on-disk tribometer. Fourier transform infrared (FTIR), field emission scanning electron microscopy (FESEM), and energy dispersive X-ray spectroscopy (EDS) were used to characterize the synthesis of PTFE/PMMA composite. The shore hardness and glass transition temperature (Tg) were obtained respectively by shore hardness tester and differential scanning calorimetry (DSC). The results show that the friction coefficient and wear rate of PMMA based composite, comparing with the unfilled PMMA, can be significantly reduced by filling with PTFE. With the increasing of PTFE filling mass ratio, the wear rate of PTFE/PMMA composite increases. The friction coefficient and wear rate of the unfilled PMMA and PTFE/PMMA composite generally decrease with the P/L ratio increasing. The main wear mechanism of the unfilled PMMA is adhesive wear. While the main wear mechanisms of PTFE/PMMA composites are fatigue wear and abrasive wear.
研究领域:
材料科学
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摩擦学
✓ 已验证
DOI
高影响因子
Defence Technology
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2025
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IF 5.9
Wei Huang,Yaofeng Mao,Sijia Yu,Longjie Huang,Jie Chen,Cui Nie,Xingquan Zhang,Fude Nie,Jun Wang
The energy release of energetic composites is severely limited by the inert alumina (Al 2 O 3 ) layer on the surface of aluminum (Al). Polytetrafluoroethylene (PTFE) could eliminate Al 2 O 3 layer due to its highly electronegativity and oxidability of fluorine. However, adding PTFE particles would weaken interfacial interactions resulted in poor mechanical properties and interfacial exothermic reaction. Herein, a bridging Al-PTFE as fuel and interfacial reinforcing agent was added and used to prepare LLM-105/Al-PTFE microspheres, achieving both high energy output and excellent mechanical properties. The energy release and combustion reaction performance of LLM-105/Al-PTFE microspheres are significantly improved due to high reaction heat and increased interfacial reaction area of Al-PTFE. The maximum pressure and pressurization rate of LLM-105/Al-PTFE microspheres are 164.06 kPa and 29.88 kPa/s, respectively, which are 40.11% and 16.67% higher than those of physical mixed samples. Furthermore, the tensile strength and compressive strength of LLM-105/Al-PTFE microspheres are 100.40% and 26.47% higher than those of LLM-105/Al. This work provides a new approach to improve the energy release and mechanical properties for energetic composite.
研究领域:
材料科学
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化学工程
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含能材料
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复合材料
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
ChemistrySelect
·
2022
·Vol. 7
·期 40
·e202203024
·
IF 2.307
Xuehui You,Fang Liu,Guofei Jiang,Shuhua Chen,Beiya An,Rongli Cui
Graphical Degradation experiments of TC suggested that SCN/NT-2@PTFE composites showed the best photocatalytic performance under the optimal conditions, the degradation rate of tetracycline reached 99 % after 120 min of irradiation. The preparation of SCN/NT-2@PTFE composite membrane can solve the problem of difficult recovery and secondary contamination of powder catalysts. Herein we synthesized S-g-C 3 N 4 and N−TiO 2 catalysts by hydrothermal and calcination technologies and SCN/NT@PTFE membrane by a vacuum filtration method. The morphology and composition of the synthesized materials were analyzed by different characterization methods (SEM/HRTEM/XRD/XPS/UV-vis et.). The effects of different catalysts, pollutant concentrations, mass of catalyst and pH on the photo-degradation of tetracycline were investigated. The degradation rate of tetracycline by SCN/NT-2@PTFE membrane was as high as 99.9 % after 2 h of illumination. This was mainly because heterogeneous structure between S-g-C 3 N 4 and N−TiO 2 broadened the light absorption range and suppressed the carrier complex. Superoxide radicals (⋅O 2 − ) were proved to play a dominant role in the degradation reaction. After 20 days of stirring in water, the photocatalytic performance of membrane decreased slightly, demonstrating its good stability. The study of SCN/NT-2@PTFE membrane provides a new direction for the development of photocatalysis and membrane.
研究领域:
环境科学
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材料科学
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化学
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水处理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
·
IF 13.2
Shichao Qiu,Xinghe Teng,Yuxin Zhang,Xin Wang,Kaikai Chen,Jian Zhao,Qinglin Huang
As an energy output device, triboelectric nanogenerators (TENGs) have greatly promoted the application of wearable electronics, particularly in energy harvesting and human motion monitoring. However, the TENGs applied in wearable electronics require not only high electrical output performance but also wearable comfort. This paper provided a polytetrafluoroethylene (PTFE) nanofiber yarn-based TENGs. The prepared nanofiber yarn featured a core–shell structure, with PTFE/graphene nanofibers forming the friction shell layer while a copper wire serving as the conductive core layer. When the graphene content reached 2 wt%, the resulting woven fabric (GW-TENG-2) showed the best comprehensive performance. The GW-TENG-2 exhibited high air permeability (air flux 1618.9 mm·s −1 @ 10 kPa), outstanding self-cleaning properties, as well as stable washing resistance (no changes in voltage after five washes). Meanwhile, the GW-TENG-2′s open-circuit voltage (Voc), short-circuit current (Isc), and maximum instantaneous power density reached 206 V, 16.3 μA, and 1.04 W/m 2 , respectively, demonstrating its excellent electrical output performance. Consequently, it successfully powered 180 light-emitting diodes (LEDs) and was capable of charging commercial capacitors and electronic watches. Furthermore, by attaching GW-TENG-2 to different human body parts (throat, fingers, elbow, etc .), the movement of these regions could be effectively monitored. For instance, in the case of the human finger, the resulting voltage signal varied from 0.4 V to 1 V as the fingertip bent from 30° to 90°. These results highlighted that GW-TENG-2 held significant potential for applications in wearable electronics, particularly for energy harvesting and motion monitoring.
研究领域:
材料科学
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能源技术
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2023
·
IF 6.2
Can Wu,Yingwei Wu,Huijun Zhao,Shuaishuai Li,Jing Ni,Xinglin Li
The surface microstructure of biomimetic Procambarus clarkia claw was prepared on the surface of GCr15 steel, then PTFE solid lubricants dispersed with three different hardness nanoparticles (C, ZnO, Al 2 O 3 ) were filled in. The results of the tribological experiment show the textured surface lubricated by PTFE with Al 2 O 3 nanoparticles reflected the best performances. Because PTFE stored by the bionic texture could be supplied to the friction surface to form a solid lubrication film. Due to the addition of Al 2 O 3 nanoparticles, the hardness and wear resistance of the film are improved, thus avoiding a large loss of PTFE. And the process of "rolling-embedding PTFE surface-exposing-rolling" occurs. As a final, the surface tribological properties of GCr15 steel can be significantly improved.
研究领域:
材料科学
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摩擦学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Liangjie Wang,Chunxiang Geng,Dawei Yu,Daoqing Liu,Hao Sun,Ke Xiao,Huazhang Zhao
High temperatures and high pressures restrict the application of catalytic wet air oxidation (CWAO). Thus, realizing the high performance of CWAO under ambient pressure (AP-CWAO) is attractive. In this study, hydrophobic modification by polytetrafluoroethylene (PTFE) was adopted to enhance the O 2 transfer and salts resistibility of hollow microspheres NiCo 2 O 4 (HM-NiCo 2 O 4 ), for harvesting an efficient catalyst of AP-CWAO to treat high-salt wastewater. Under ambient pressure in 10 g/L NaCl solution, PTFE modified HM-NiCo 2 O 4 (PHM-NiCo 2 O 4 ) can catalyze O 2 to realize about 70 % mineralization of bisphenol A (BPA, 100 mg/L) within 240 min at 80 ℃, while it is only about 50 % for HM-NiCo 2 O 4 . Density functional theory calculations and molecular dynamics simulations show that PTFE indeed can enhance O 2 transfer and salt resistibility of HM-NiCo 2 O 4 . HO•, O 2 •- , and 1 O 2 all contribute to the degradation of BPA in presence of O 2 . These reactive oxygen species generate based on Mars-van Krevelen mechanism.
研究领域:
环境科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2024
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IF 5.3
Zhigao Ma,Bingyan Jiang,Dietmar Drummer,Lu Zhang
An electrolyte solution incorporating sodium saccharin and an alkynyl compound was provided to electroform Ni-P-PTFE mold inserts with both low internal stress and good self-lubricating properties. The results showed that with 5 g·L −1 sodium saccharin and 1 mL·L −1 alkynyl compound, the internal stress reached a minimum of −114 MPa, an 82 % reduction from the −646 MPa observed without additives. The presence of sodium saccharin and alkynyl compound in the electrolyte solution reduced the hydrogen evolution reaction current from 15.2 to 12.9 mA at the operating cathode potential of −1 V and decreased the RTC (111) from 100 % to 90 %. The reduction of internal stress in the electrodeposited Ni-P-PTFE composites was attributed to the decreased hydrogenation strain, diminished Ni (111) texture intensity, and the partial incorporation of alkynyl compound reaction products into the deposits, which weakened the connections between crystallites. Finally, 5 g·L −1 sodium saccharin and 1 mL·L −1 alkynyl compound was applied to electroform Ni-P-PTFE mold insert with micro features. Only slightly pile-up defects at the corner of grooves were observed on the polymer chips demolded from Ni-P-PTFE mold insert, demonstrating its good self-lubricating property.
研究领域:
材料科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Sha Yu,Yitian Qin,Qi Zhao,Mei Li,Haijun Yu,Guodong Kang,Yiming Cao
Nafion-PTFE hollow fiber composite membranes were applied in the ammonia removal and recovery with a novel aqueous-organic membrane contactor (AOMC) process, in which an aqueous solution and an organic solution were separated by the composite membrane. A kerosene-diluted di-(2-ethylhexyl) phosphoric acid (D2EHPA) solution was used to receive the ammonia, which could be recycled and reused after regeneration by the stripping agent (a dilute solution of H 2 SO 4 , HNO 3 , or H 3 PO 4 ). The new-type membrane contactor can avoid the accompanying water transport in conventional membrane contactors. The effects of experimental factors including the pH, the velocity and the initial ammonia concentration of the feed on the overall mass transfer of the ammonia were investigated. Meanwhile, how the regeneration experiment parameters influenced the stripping ratio was also studied. The results showed that the AOMC process was more favorable to treat ammonia feed with low ammonia concentrations. The ammonia removal could be over 99% under certain conditions. Additionally, the ammonia was concentrated 26.4 times after four cycles. It was found that the accompanying water transport was non-negligible in the traditional aqueous-aqueous membrane contactor (AAMC) process when treating ammonia feed of low concentrations, with the maximum water flux two orders of magnitude higher than ammonia.
研究领域:
环境工程
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化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Qin Liu,Xin Liu,Bo Wu,Changge Wang,Tiantian Li,Wancheng Li,Yun Huang,Yao Li,Haiyang Yan,Chuanrun Li
This study harnessed polydimethylsiloxane (PDMS)-coated polytetrafluoroethylene (PTFE) composite (PDMS/PTFE) membranes for the separation of peppermint aromatic water in vapor state. The effects of the PDMS coatings’ morphology structure on the separation performance of the membrane were investigated. The vapor permeation process, selective-permeation mechanism, and membrane stability were explored. Results showed that the separation effect of the membranes depended on the degree of polymerization of PDMS coating. Almost no water molecules can pass through the membrane during the 6 h separation process, and the separation factor was as high as 668. The main pharmacodynamic components in the separated permeate were L-menthol, L-menthone, and menthyl acetate, accounting for 49.16 %, 26.3 %, and 5.46 %, respectively, which conformed to the standard of the European Pharmacopoeia . The parameters of membrane separation showed that the maximum permeability coefficients of L-menthol, L-menthone, menthyl acetate, and water were 40.80, 20.28, 4.211, and 0.3945, respectively, at 105 °C and 65 kPa. This finding indicated that the large difference in permeability coefficient was the key to the excellent selectivity of the PDMS/PTFE membrane for separating volatile pharmaceutical components and water molecules in the peppermint aromatic-water system.
研究领域:
材料科学
·
药学
✓ 已验证
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 12
·1747
·
IF 3
Wenfeng Zai,Yangman Chen,Qingdong Qin,Xiangkun Li,Dezhao Liu
HighlightsPlasma-grafting acrylic acid composite membrane for MABR was prepared.Higher O2transfer rate and better hydrophilicity for modified membranes than pristine.Modified PVDF membrane demonstrated superior nitrogen removal during startup.Activity of denitrifying bacteria was enhanced in the modified PVDF MABR.AbstractMicroporous membranes such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) often exhibit suboptimal hydrophilicity and microbial adhesion, which impede effective nitrogen removal in membrane-aerated biofilm reactors (MABRs), particularly during initial operational phases. To address this issue, the present study introduced acrylic acid (AA) following plasma treatment (P) to enhance membrane performance, thereby engineering a novel composite material optimized for MABR applications. Four MABRs—Reactor with pristine PVDF membrane (R-PVDF), Reactor with composite PVDF membrane (R-PVDF-P-AA), Reactor with pristine PTFE membrane (R-PTFE), and Reactor with composite PTFE membrane (R-PTFE-P-AA)—were evaluated. The modified membranes displayed enhanced roughness and hydrophilicity, which improved biocompatibility and variably increased the oxygen transfer efficiency. Notably, the R-PVDF-P-AA configuration showed a significant enhancement in the removal rates of NH4+-N and total nitrogen (TN), achieving 78.5% and 61.3%, respectively, which was markedly higher than those observed with the original membranes. In contrast, the modified R-PTFE-P-AA exhibited lower removal efficiencies, with NH4+-N and TN reductions of approximately 60.0% and 49.5%. Detailed microbial community analysis revealed that the R-PVDF-P-AA membrane supported robust commensalism between ammonia-oxidizing and denitrifying bacteria, underpinning the improved performance. These findings highlight the critical role of surface chemistry and microbial ecology in optimizing the function of MABRs.
研究领域:
环境工程
·
微生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Liuting Shi,Jia Hu,XuDong Lin,Liang Fang,Fang Wu,Jiao Xie,FanMing Meng
Composite coatings consisting of polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE) and 40 nm silicon dioxide (SiO 2 ) nanoparticles (PPS-PTFE/SiO 2 ) with SiO 2 in the range of 0–4 g/l were successfully prepared on AZ31 Mg alloys by a simple spray process. The morphology, composition, water contact angle (WCA), wear behavior and corrosion properties of the composite coatings were measured by using SEM, FT-IR, OCA20, sandpaper abrasion and electrochemical workstation, respectively. Effects of SiO 2 content on the wear behavior and corrosion properties of the coatings were studied. It is found that micro-sized protrusions distribute on the surface of the coatings, and a fibrous-network structure of PTFE arranges on the protrusions. WCAs of the PPS-PTFE/SiO 2 (0–4 g/l) coating are in the range of (152°–145.5°) ± 0.3° and the sliding angles (SAs) are less than 5°. The WCAs of the un-abraded and 10 m-abraded-on-sandpaper PPS-PTFE/SiO 2 (4 g/l) coating are 145.5°±0.3° and 142.5°±0.3°, respectively, implying the PPS-PTFE/SiO 2 coating is a robust superhydrophobic one with good wear resistance. Due to the superhydrophobic characteristics, the PPS-PTFE-based coatings show superior corrosion resistance in 3.5 wt% NaCl solution to pristine AZ31 Mg alloys. Owing to the excellent superhydrophobicity, wear resistance and corrosion resistance properties, the robust PPS-PTFE/SiO 2 coating is regarded to possess great potential to be applied in automobiles and navigation industries in future.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
✓ 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）