Materials Today Communications
·
2022
·
IF 3.662
Mengmeng Yu,Guohua Jiang,Muslum Demir,Yanfang Sun,Rui Wang,Tianqi Liu
Photothermal conversion is an environmentally friendly and promising technology for producing freshwater. Solar thermal conversion provides a simple and scalable method for photothermal conversion and purifying water. However, its practical application requires more efficient, robust, and photothermal functional materials . In this research, the PTFE-based composite nanofiber membrane was prepared by electrospinning, hot-pressing, and subsequent sintering treatments to improve the photothermal conversion. The results demonstrated that the prepared PTFE-based membrane has ~91.4% photothermal conversion efficiency under one sun illumination (~2.3 kg∙m 2 ·h −1 ). The excellent solar-thermal conversion efficiency of the PTFE-based membrane is contributed to their unique membrane surface microstructure and chain transformation after sintering treatment. In addition, the stress strength and strain of the PTFE-based composite membrane were 11.5 MPa and 482%, respectively. The excellent mechanical and photothermal conversion of PTFE-based composite fiber membranes offer its promising application in interface evaporator.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Bio Materials
·
2024
·
IF 4.6
Siqi Zhou,Yulu Liu,Xueke Yu,Dongfang Wang,Xiaofeng Wang,Qian Li
Expanded polytetrafluoroethylene (ePTFE) failed to achieve clinical application in the field of small-diameter blood vessels due to its lack of elasticity in the circumferential direction and high stiffness. Excellent multidirectional elasticity and dynamic compliance matching with natural blood vessels are important means to solve the problem of acute thrombosis and poor long-term patency. Herein, novel PTFE spinning blood vessels were prepared by the PTFE emulsion electrospinning process, which not only presented good bidirectional elasticity but also promoted the adhesion and proliferation of endothelial cells and induced the contractile expression of SMCs. And, a PTFE-shish and aminated polycaprolactone (PCL)-kebab structure has been developed that converted the chemically inert PTFE surface into a drug-loading platform for the multifunctionalization of PTFE vascular grafts. It provides novel preparation methods for the application of new bidirectional elastic small-diameter artificial blood vessels and their surface functionalization construction.
研究领域:
生物材料
·
组织工程
·
血管移植物
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sensor Letters
·
2016
·Vol. 14
·期 9
·859-863
·
IF 0
Ding Yu,Li Yibin,Wu Huimin,Wang Shengfu,Xia Qinghua
20 wt% PtFe/C catalysts were prepared by a chemical reduction method at high temperature. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, and electrochemical testing. The sensor based on PtFe/C showed a detection limit of 0.03 mM and high
sensitivity with linear range from 0.1 mM to 13.5 mM. The sensor still had high selection for glucose in the presence of commonly interfering species, such as ascorbic acid, acetamidophenol, and uric acid. The as-prepared glucose sensor has good anti-interference performance.
研究领域:
材料科学
·
电化学
·
生物传感
✓ 已验证
DOI
JOURNAL OF POROUS MATERIALS
·
2024
·Vol. 31
·期 3
·1005-1014
·
IF 2.5
Han Song,Wang Yanqing,Xu Yanru,Wu Jinlong
Bulk polytetrafluoroethylene (PTFE) foam is a great potential oil–water separation material, owing to the high hydrophobicity and lipophilicity property. However, the technique of fabricating PTFE foam with low cost, controllable porosity and high mechanical strength remains an urgent requirement due to its high chemical inertness induced limitation. A kind of bulk PTFE foam material is prepared by cold pressing co-sintering method, employing sodium chloride (NaCl) as pore forming agent. SEM measurements reveal that the size and distribution of pore structure are mainly determined by the particle size and content of NaCl, because the migration and diffusion behaviors of PTFE particles suffer from more inhibition induced by increased NaCl particles during sintering. The PTFE foam with uniformly distributed pore structures can be obtained from composite mixed with 70 wt% NaCl and 30 wt% PTFE, with a low thermal conductivity as low as 0.069 W/(m K). With the decrease of PTFE content in raw composite, the density and mechanical properties of PTFE foam gradually declines. However, the tensile strength remains as low as 0.2 MPa, with an elongation rate of 21%, which guarantees the required mechanical strength avoiding being broken when use as a bulk oil absorption material. Remarkably, the PTFE foam shows a strong hydrophobicity, with a mean water contact angle of 137°, and with a mean surface roughness of 4.41 μm. It exhibits separation efficiency larger than 99% in 30 cycles, with separation flux larger than 4000 L/m 2 /h within 15 cycles, indicating excellent recyclability and stability. The PTFE foam sample also shows desirable continuous separation performance for oil/water mixture. The proposed bulk PTFE foam with low manufacturing cost and stable chemical and mechanical properties will provide data and theoretical support for the material applied in oil/water separation and thermal-protective coating.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Jinxue Cheng,Naijia Zhao,Yuxin Zhang,Yan Huang,Qinglin Huang,Changfa Xiao
Uniform-sized core-shell microspheres have received more and more attentions owing to the therapeutic application such as controlled release and drug targeting. In this work, we proposed a facile method to fabricate core-shell microspheres with uniform size. Polymethyl methacrylate (PMMA)@polylactic acid (PLA) core-shell microspheres with controllable core and shell size were prepared by combining membrane emulsification (ME) technology and solvent evaporation method. Specially, the near-field electrospinning (NFES) poly(tetrafluoroethylene) (PTFE) membranes and biaxially stretched PTFE membranes were utilized in the ME process. Subsequently, a series of PMMA@PLA core-shell microspheres were successfully prepared, where the core size of microspheres depended on the hydrophobic NFES PTFE membrane while the shell size depended on the hydrophilic biaxially stretched PTFE membrane. Meanwhile, the variation of droplet size and distribution with the evaporation temperature, pressure and continuous phase rotating speed were also investigated. When the solvent evaporation temperature was 40 °C, the obtained PMMA@PLA core-shell microspheres showed optimal morphology and size distribution. Moreover, the shell size increased with the increase of operating pressure and the decrease of continuous phase rotating speed. This facile strategy showed great potential for efficiently preparing uniform-sized core-shell microspheres in large scale.
研究领域:
材料科学
·
制药工程
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2019
·
IF 7.015
Zhihao Zhu,Guodong Kang,Ying Sun,Sha Yu,Meng Li,Jie Xu,Yiming Cao
The batch and continuous synthesis of glycolic acid via carbonylation of formaldehyde using high-temperature and high-pressure poly(tetrafluoroethylene) (PTFE) membrane contactor was demonstrated in this paper. The experiments in conventional stirred tank reactor were also conducted for comparison. The results showed that the yield of glycolic acid was significantly improved in membrane contactor system compared to the stirred tank reactor. At reaction temperature of 120 °C and reaction pressure of 5.0 MPa, the yield of glycolic acid was higher than 90% when the reaction time was 1 h, while it was only about 45% in the conventional stirred tank reactor. The enhancement of yield was due to the improvement of mass transfer or dispersion of CO in membrane contactor system, which could provide larger gas-liquid contact area and shorter mass transfer distance. The stability of PTFE hollow fibre membranes was also investigated by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), liquid entry pressure (LEP), bubble point (BP) and contact angle (CA) measurements. The characterizations indicated that PTFE membranes exhibited good chemical and thermal stability in this reaction system. This study provided new idea and reference for the carbonylation of formaldehyde and similar gas-liquid reactions.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2018
·Vol. 22
·期 7
·1971-1981
·
IF 2.509
Gao Pingping,Xie Zhiyong,Ouyang Chun,Tao Tao,Wu Xiaobo,Huang Qizhong
The Ni-P/TiN/PTFE (poly tetra fluoroethylene) composite coatings were prepared by electroless plating method on Ti plate, which was used as bipolar plates of proton exchange membrane fuel cells (PEMFCs). The morphology, crystallographic texture, electrochemical corrosion, contact resistance, and hydrophobic property of the Ti bipolar plates with coatings were investigated. The results revealed that Ni-P/TiN/PTFE coating had a dense surface morphology, uniform distribution of composite particles. Ti with coating showed 0.48 μA cm 2 of corrosion current in the simulated solution of PEMFCs and 6 mΩ cm 2 of interfacial contact resistance (ICR). The hydrophobicity test showed that the coating interface was flat and the wetting angle was 112.4°. In conclusion, The Ni-P/TiN/PTFE composite coatings exhibit superior improvement in corrosion resistance, interface hydrophobicity, and conductivity to Ni-P, Ni-P/TiN, and Ni-P/PTFE coatings. The Ni-P/TiN/PTFE coating was suited for bipolar plate surface modification of bipolar plates.
研究领域:
材料科学
·
电化学
·
燃料电池技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3825-3836
·
IF 4.5
Geng Cong,Lv Jiayu,Ming Hao,Liu Shiyue,Gao Yingjun,Meng Jing,Gao Weichun,Shen Xinjun,Zhao Zhongyuan,Xi Jingjun,Chen Shengwei,Guan Yinyan,Liang Jiyan
Capacitive Deionization (CDI) is a low energy, environmentally friendly desalination technology. In this study, PTFE activated carbon electrodes were prepared based on emulsion spraying technology and applied to CDI. In this article, resistivity, contact angle, specific surface area was tested. Combined with scanning electron microscope(SEM) and cyclic voltammetry(CV), the influence of KH550 dosages (2 g, 4 g, 6 g, 8 g) and layers of spraying (1–6 layers) on electrode performance was investigated. Coupling reagent KH550 played a role to enhance the adhesion of PTFE, and bridge activated carbon to form path for electron together with PTFE. When 4 g KH550 is added, a continuous conductive path was achieved, so the electrode exhibit good conductivity, with a resistivity of 7.65 Ω/cm. As layer increasing, more active carbon, the adsorbent, were joined together by binder, PTFE and KH550. Therefore, the specific surface area and capacitance increased. When 4 layers were sprayed, the electrode obtained a better specific capacitance, 0.564 F/cm 2 , but the mass transfer resistance became higher. Electrode, prepared by 4 g KH550 and 3 layers, was used for desalination. For low-concentration brine, salt removal rate and charge efficiency were 8.849 mg/g and 46.75%, respectively. This research provides a simple route for the preparation of activated carbon electrodes for the preparation of CDI, which was easy to expand production. The prepared electrode has great application potential in brackish water desalination.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yiting Che,Haoquan Wang,Hao Fu,Dingfeng Ma,Liang Wang,Romanov Anton,Shitan Yan,Ting Bian
Intermetallic electrocatalysts have demonstrated significant potential in facilitating the cathodic oxygen reduction reaction (ORR) in fuel cells with enhanced activity and durability. However, it is still an enormous challenge to the facile synthesis of Pt-based intermetallic catalysts with uniform size and high ordering degree. Here, we innovatively fabricate the core-shell structured L1 0 -PtFe intermetallics with Pt skins supported on N-doped porous carbon matrix through one-step pyrolysis of PtFe Hofmann-type metal-organic frameworks (denoted as L1 0 -PtFe/NC). Under the constraints of the porous structure and cyano-ligand bonding, most Fe atoms are alloyed with Pt to form uniform-ordered PtFe intermetallics, while some Fe atoms are atomically dispersed in the carbon framework to form FeN x moieties. Notably, a series of intermetallic PtFe catalysts with different ordering degrees are successfully constructed by adjusting the pyrolysis temperature, which verified that the increase of ordering degree is beneficial to promote the electrocatalytic performance. In particular, the ordered L1 0 -PtFe/NC-800 exhibits superb ORR activity with both mass and specific activities, which are 2.7-folds higher than those of commercial Pt/C. Moreover, after an accelerated durability test, L1 0 -PtFe/NC-800 retains over 90 % mass activity. This work provides a promising approach for the development of efficient Pt-based intermetallic electrocatalysts for fuel cells.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2021
·
IF 3.423
Antuo Wang,Xianglong Li,Teng Hou,Yishen Lu,Jing Zhou,Xianggui Zhang,Bin Yang
In order to solve the problem of air pollution, especially in high temperature environment, an ultrafine poly(tetrafluoroethylene) (PTFE) porous fibrous membrane (UPPFM) was created by electro-centrifugal spinning, sintering calcination and impregnation technology in this paper. The pores distribution on the surface of the fibers could be simply controlled by adjusting PVP/PTFE ratios, and prompted the porosity of obtained membrane up to 94.1%. The obtained membrane presented an ultralow air resistance to 89.9 Pa with filtration efficiency higher than 99.72%. Moreover, UPPFM showed excellent heat stability and reusability, and therefore exhibited a great potential application in the high temperature air filtration.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jinxue Cheng,Yuxiao Zhao,Xin Feng,Qinglin Huang,Yan Huang,Minjie Guo,Bowen Cheng
Poly(tetrafluoroethylene) (PTFE) membrane is remarkable due to its impressive comprehensive properties. However, the PTFE membrane’s chemical inertness and low surface energy make it difficult to achieve pore geometry regulation and functional modification. In this work, the PTFE/ZnO photocatalytic fiber membrane with regular membrane pore geometry was prepared by Near-filed electrospinning (NFES) technology. The precursor Zn(Ac) 2 was added to the PTFE/poly(ethylene oxide) (PEO) spinning solution to introduce the ZnO seed layer. Then ZnO was grown in situ by hydrothermal method to prepare the NFES PTFE/ZnO membrane. The effects of the mass ratio of the PTFE/PEO spinning solution and the additional amount of Zn(Ac) 2 on the membrane morphologies were investigated, and the effects of different membrane pore geometries on the photocatalytic degradation of methylene blue (MB) dye wastewater were discussed. The results showed that when the mass ratio of PTFE/PEO was 5:1 and the addition amount of Zn(Ac) 2 was 15 wt%, the membrane had the optimal morphology. Compared with the PTFE/ZnO membrane prepared by electrospinning, the NFES PTFE/ZnO membrane with regular membrane pore geometry had more catalyst loading, and the dynamic MB removal rate reached 97.6% after 4 h of UV irradiation. After 5 cycles of testing, the degradation rate of MB can also reach 70.8%.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2022
·
IF 8.857
Hongming Fu,Kaili Xue,Zhaohao Li,Heng Zhang,Dan Gao,Haiping Chen
Excessive CO 2 emissions contribute to global warming, which may cause potential threat to survival of humans and other creatures, and it is necessary to take effective measures to curb CO 2 emissions. Gas-liquid membrane contact CO 2 separation technology is an emerging CO 2 capture technology that combines advantages of membrane separation and chemical absorption . In this paper, differences of CO 2 capture performance between ceramic and polytetrafluoroethylene (PTFE) membranes with pore size of 10 nm and 100 nm are investigated comprehensively. The morphological structure, pore size distribution, wettability and membrane flux of ceramic and PTFE membranes are analyzed by membrane characterization. Moreover, with monoethanolamine (MEA) as absorbent, CO 2 capture performance under different operating parameters (e.g., absorber flow rate and temperature, gas flow rate and pressure) is investigated through experiments based on ceramic and PTFE membrane modules . The CO 2 capture efficiency of ceramic and PTFE membrane is 94.7% and 99.3%, respectively. However, the mass transfer rate of ceramic membrane is much higher than that of PTFE membrane. The results show that ceramic membrane exhibits favorable CO 2 capture performance under appropriate operation parameters. This paper will provide theoretical and technical references for subsequent industrial CO 2 capture applications.
研究领域:
环境科学
·
化学工程
✓ 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）