CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Zequan Ma,Yilin Dong,Xu Tan,Jia Xue,Xiaoge Li,Yu Gu,Hui Shi,Lin-Wei Chen,Kun Wang,Lei Wang
Strong metal – support interactions represent a promising strategy to regulate catalytic performance by forming a thin encapsulation layer or new metal-bond, which have attracted explosive research attention. However, a full coating layer can sometimes block the accessibility of reactants to the active sites and significantly reduce the activity. Herein, we report a new method to construct specific PtFe/Al 2 O 3 -Fe 2 O 3 interface via tuning a relatively moderate metal-support interaction over the Al 2 O 3 -Fe 2 O 3 (AF) composite material. Our findings reveal that a permeable FeO x coating layer and PtFe alloy were formed on the Pt/AF catalysts under high temperature reduction conditions. The encapsulation layer was much thinner than that of the Pt/Fe 2 O 3 under a similar high temperature treatment. The precisely engineered Pt-Fe/AF interface presented exceptional catalytic activity for hydrogenation of cinnamaldehyde with high C=O hydrogenation selectivity (∼88 %) and impressive sulfur-resistance. This straightforward and effective approach holds significant potential value for future industrial applications.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Jingge Ju,Zongjie Li,Yi Lv,Mengyao Liu,Kaouthar Fejjari,Weimin Kang,Yuan Liao
Membrane distillation (MD) is an attractive membrane process for seawater and brine water desalination. One of the main obstacles for MD application is the absence of an effective MD membrane with high water permeability and an excellent salt rejection. This work proposes a novel design strategy of hydrophobic/hydrophilic bi-component membranes for MD by electrospinning and calcination . Unlike the conventional dual-layer hydrophobic/hydrophilic membranes, the bi-component membrane developed in this work is composed of multiple layers of hydrophilic polyimide (PI) nanofibers and hydrophobic polytetrafluoroethylene (PTFE) microclusters, which interweave with each other in the entire membrane. The optimal hydrophobic/hydrophilic bi-component membrane #PTFE/PI-2 shows robust three-dimensional (3D) superhydrophobic and self-cleaning properties. It exhibits a highly competitive permeation flux of 42 ± 3 L m −2 h −1 and an excellent salt rejection above 99.9% in a 400-h continuous DCMD operation when the feed solution was synthetic seawater with a NaCl concentration of 3.5 wt% at 60 °C. Moreover, it is able to achieve an outstanding water flux of 40 ± 2 L m −2 h −1 and a salt rejection over 99.9% when the feed solution was brine water with a NaCl concentration of 25 wt%. The high vapor permeability of #PTFE/PI-2 should be attributed to the high membrane porosity, negligible mass transfer resistance of PI nanofibers and more effective water evaporation area on its superhydrophobic surface. Meanwhile, the excellent anti-wetting property should be due to a unique 3D superhydrophobicity constructed by multiple layers of PTFE microclusters.
研究领域:
材料科学
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环境工程
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化学工程
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高影响因子
Micro & Nano Letters
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2019
·Vol. 14
·期 10
·1087-1091
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IF 0.975
Haikun Zhou,Pan Wang,Pingping Gao,Xiaobo Wu,Zhiyong Xie
Titanium nitride (TiN)-modified hydrophobic-treated carbon paper (CP) was prepared by impregnating CP with polytetrafluoroethylene (PTFE) emulsion containing TiN nanoparticles (NPs). Electrochemical measurements showed that CP witnessed an increase in corrosion resistance and electrical resistivity after treated with 5 wt% PTFE emulsion. Since the sacrifice in electrical conductivity is not beneficial to the application in proton exchange membrane fuel cells (PEMFCs), conductive ceramic NPs – TiN NPs were introduced into the CP to further improve its electrical conductivity. It was found that after adding TiN NPs, the electrical resistivity of CP (immersed in 5 wt% PTFE emulsion containing 8 wt% TiN NPs) decreased to a level (3.8 mΩ cm) similar to that of untreated CP (3.5 mΩ cm), and meanwhile there is a further improvement in corrosion resistance, where the corrosion current density (at 1.4 V) of TiN-modified CP stabilises at the lowest value of 5.50 μA/cm 2 , as compared with 32.8 and 12.7 μA/cm 2 for raw CP and PTFE-treated CP. According to microstructure characterisation, these improvements could be attributable to the formation of conductive networks and improved PTFE distribution due to the addition of TiN NPs.
研究领域:
材料科学
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电化学
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高影响因子
TRIBOLOGY INTERNATIONAL
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2021
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IF 4.872
Na Wang,Honggang Wang,Junfang Ren,Gui Gao,Gengrui Zhao,Yawen Yang,Jinqing Wang
Environmental-friendly polytetrafluoroethylene@silica (PTFE@SiO 2 ) composite particles characterized by core-shell structure were synthesized. The tests demonstrated that the synthesized particles had good dispersibility and stability in poly-α-olefin 6 (PAO6) and its corrosion resistance was better than zinc dialkyl dithiophosphate (ZDDP). The extreme pressure (EP) and tribological tests evidenced that PTFE@SiO 2 particles possessed superior EP and anti-wear (AW) properties, which could enhance the wear-resistance and load-bearing capacities of PAO6 in high efficiency, whereas the tribological performance was greatly affected by the load. Besides, EP tests for different kinds of base oils demonstrated that the addition of PTFE@SiO 2 particles could significantly improve the bearing capacity of these base oils, and the corresponding performances were also better than ZDDP. Scanning electron microscope and X-ray photoelectron spectrum characterizations proved that there was an organic-inorganic co-extruded transfer film generated on the worn surface, and a possible lubrication mechanism on this basis was also put forward.
研究领域:
材料科学
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化学工程
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高影响因子
RSC Advances
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2017
·Vol. 7
·期 37
·22810-22817
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IF 3.108
Zhenhua Li,Jingsong Liu,Ying Yuan,Enzhu Li,Fu Wang
In this work, fluoride-functionalized glass fiber (F-GF) was prepared, in which glass fiber (GF) was modified with γ-methacryloxy propyltrimethoxy silane (γ-MPS), and then reacted with 2,2,2-trifluoroethyl methacrylate (TFEMA). Subsequently, PTFE/glass fiber microwave composites were prepared by incorporating 5 wt% of the GF, γ-MPS modified GF (M-GF) or F-GF into PTFE. The effect of F-GF on the mechanical and dielectric properties, as well as moisture absorption and coefficient of thermal expansion of the composites were investigated. The results show that fluorine is successfully grafted onto the surface of GF through –CF3 group, and F-GF forms a dense and compact interfacial structure with PTFE. The mechanical properties of PTFE/F-GF, including tensile strength (38.53 MPa) and elongation (226.82%), are obviously higher than those of PTFE/M-GF (34.73 MPa and 179.50%, respectively) and PTFE/GF (34.82 MPa and 174.33%, respectively). In addition, the PTFE/F-GF composite shows improved density (2.174 g cm−3), dielectric constant (2.18), and decreased dielectric loss (0.0009), moisture absorption (0.008%) and temperature coefficient of dielectric constant (−18.6 ppm per °C). The conclusions demonstrate that the method of surface fluorination of glass fibers offers promising application in PTFE based microwave materials.
研究领域:
材料科学
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复合材料
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DOI
高影响因子
Journal of Materials Chemistry A
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2018
·Vol. 6
·期 23
·10939-10946
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IF 9.931
Yuhong Chang,Zhenguang Wang,Yu-e Shi,Xicheng Ma,Long Ma,Yuqiang Zhang,Jinhua Zhan
Solar steam generation is a promising application for utilizing exhaustless solar energy for steam generation, desalination, sterilization, and water treatment. Over the past several decades, scientists have made many attempts to design rational structures to promote evaporation efficiency including optimizing optical absorption, photothermal conversion, heat localization, and water transportation. Here, an efficient solar steam generation device was fabricated through decorating a nonstoichiometric W18O49 mesocrystal, as a solar light-to-heat material, onto a hydrophilic PTFE membrane. Nonstoichiometric W18O49 mesocrystals were incorporated into the membrane, and confirmed by the XRD, SEM, TEM, and XPS characterizations, which can transfer light to heat after absorbing sunlight and lead to water evaporation on a local area of a membrane. The structure of the solar steam generation device was confirmed by the results of SEM and contact angle measurements, which insured the solar steam generation device self-floated on top of water, thereby providing a continuous water supply to the local area heated by the W18O49 mesocrystals from bulk water. Under one sun illumination, the evaporated water mass loss reached 1.13 kg m−2 for a membrane thickness of M/A = 9.83 g m−2 after 1 h irradiation, and the membrane showed a high efficiency of 80.7%. Limit of water evaporation rate for the W18O49@PDMS mesocrystal membrane was further calculated to be 1.15 kg m−2 after 1 h one-sun irradiation, with a limit of efficiency of 82.0%. The salinities of simulated seawater reduced to levels far below the World Health Organization's (WHO) standard after desalination. The rational design enhancing evaporation performance also provides enlightenment for further practical applications of solar steam generation technology.
研究领域:
材料科学
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能源技术
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环境科学
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高影响因子
Journal of Water Process Engineering
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2015
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IF 0
Feng Wang,Hailin Zhu,Huapeng Zhang,Hongyan Tang,Jianyong Chen,Yuhai Guo
In order to expand application of polytetrafluoroethylene (PTFE) membrane in water process engineering , the wettability and antifouling property of PTFE membrane were studied in this work. Firstly, hydrophilic agents including amino ( NH 2 ), carboxyl ( COOH) and sulfonic acid ( SO 3 H) groups, as different hydrophilic groups, are synthesized via hydrolytic polycondensation and free radical polymerization , which were further steadily adhered to the surface of PTFE membrane by a facile physical entanglement method. Effect of hydrophilic groups on the membrane surface morphology, chemical composition, membrane characteristics and surface charge property was studied. Furthermore, filtration performance was evaluated using a bovine serum albumin (BSA) wastewater and ink as feed solutions in microfiltration . The results indicate that hydrophilic agents are firmly adhered to membrane surface due to a mechanical interlocking, which provides the excellent hydrophilicity and remits the hydrophobic interaction between the bare PTFE membrane and BSA protein molecules in microfiltration. In addition, membrane surface zeta potential alters after hydrophilic modification, leading to the stronger electrostatic repulsion between the bare PTFE membrane and BSA protein molecules. Therefore, antifouling property is finally enhanced by the synergistic effect between the ameliorative wettability and stronger electrostatic repulsion, which decreases the flux decay rate and improves the flux recovery. We hope such hydrophilic PTFE membrane modified by a simple physic entanglement method could be potentially useful in separation field.
研究领域:
材料科学
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环境工程
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化学工程
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Fei Xiao,Hongxia Zhang
Improving the hydrolysis reaction properties of aluminum to prepare renewable and environmentally friendly hydrogen is of great interest for the application of mobile hydrogen sources . Here, a series of poly(tetrafluoroethylene)-based activated aluminum composites were prepared, and their microstructures and hydrogen generation properties were investigated in detail. The results show that PTFE can effectively increase the hydrolysis reaction rate of activated aluminum composites. The sample Al–8Bi-2PTFE exhibits the fastest hydrolysis reaction rate. Through observing the microscopic morphology of the hydrolyzed products of Al–8Bi-2PTFE at different reaction times, the catalytic role of PTFE in the hydrolysis reaction of the composite was proved. PTFE can accelerate the rupture of the particles of Al–8Bi-2PTFE during the hydrolysis reaction, thereby accelerating the hydrolysis reaction rate of aluminum.
研究领域:
材料科学
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能源科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Haifeng Yang,Chuanhao Xu,Weimiao Wang,Pengfei Tang,Xiaodong Li,Shanshan He,Hebin Bao,Shuaishuai Man,Deyun Tang,Xueming Li,Guangcheng Yang,Zhiqiang Qiao
Micro-propulsion underwater technology has been an extensively concerned topic in advanced marine energy systems because of its wide prospects in high-precision prospecting and positioning. Wherein, the design and selection of propellant in energy-supply systems are the key issues to greatly explore its future application. Here, the hydrophobic thermite sticks which contain hydrophobic polytetrafluoroethylene nanoparticles and modified aluminum coated with 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane shells, were fabricated via a simple direct-writing approach. The modified thermite sticks exhibit stable underwater combustion and self-sustained propagation with a small diameter size (0.94 ± 0.05 mm). In-situ observation shows that the underwater reaction process could be divided into three steps: laser-induction, organic decomposition-dissolution, and thermite reaction. The aging results indicate that the thermite sticks demonstrate an excellent storage stability wherever in air or underwater environments. Simultaneously, it is found that its critical energy required to sustain stable underwater combustion is higher than that in air. Most notably, it not only can be used as the fuels for controllable miniature underwater propulsion, but also can be applied as the energy-delivery materials to expand thrust capacity of vehicles by igniting higher impulse explosives, such as CL-20.
研究领域:
材料科学
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海洋工程
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能源技术
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DOI
高影响因子
WEAR
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2023
·
IF 5
Zhengjie Li,Xiaowen Qi,Changxin Liu,Bingli Fan,Xiao Yang
Self-lubricating spherical plain joint bearings play a crucial role in aerospace equipment, with their performance primarily depending on the self-lubricating materials positioned between the inner and outer rings. As a typical polymer-based self-lubricating material, glass fiber reinforced epoxy resin composites receive high expectations. Polytetrafluoroethylene (PTFE) as an additive can significantly improve the friction and wear performance of glass fiber reinforced epoxy resin composites. The primary objective of the present study is to reveal the effect law of PTFE particle size on friction and wear properties of glass fiber reinforced epoxy resin composites under dry sliding conditions. Hence, the four particle sizes (P1, average < 1 μm; P2, average 12 μm; P3, average 25 μm; P4, 75–180 μm) of PTFE-filled epoxy composites were prepared. The hardness, compressive strength , and compressive modulus of the epoxy resin composites filled with four particle sizes of PTFE were measured. The coefficient of friction (COF) was evaluated using a reciprocating ball-on-disk tribometer, with a GCr15 ball as the stationary part and the composite disc as the reciprocating component. The wear rate was determined using a Mahr profilometer. The results show that the friction coefficients of four PTFE-filled epoxy resin composites have little difference. However, the wear rate of epoxy composite filled with PTFE particles of the large size (RE/P4) is an order of magnitude lower than that of epoxy composites filled with PTFE particles of the other size. The wear morphology of the composites was analyzed by scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The higher wear resistance of RE/P4 can be attributed to it exhibiting a stronger role in anchoring glass fibers (GF), compared to other particle-sized PTFE-filled epoxy resin composite materials.
研究领域:
材料科学
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摩擦学
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高影响因子
Engineering
·
2023
·
IF 12.8
Lei Li,Jing Bai,Panyu Jiang,Yan Zhang,Tingsheng Zhou,Jiachen Wang,Changhui Zhou,Jinhua Li,Baoxue Zhou
Hydrogen peroxide (H 2 O 2 ) in situ electrosynthesis by O 2 reduction reaction is a promising alternative to the conventional Fenton treatment of refractory wastewater. However, O 2 mass transfer limitation, cathodic catalyst selectivity, and electron transfer in O 2 reduction remain major engineering obstacles. Here, we have proposed a systematic solution for efficient H 2 O 2 generation and its electro-Fenton (EF) application for refractory organic degradation based on the fabrication of a novel ZrO 2 /CMK-3/PTFE cathode, in which polytetrafluoroethylene (PTFE) acted as a hydrophobic modifier to strengthen the O 2 mass transfer, ZrO 2 was adopted as a hydrophilic modifier to enhance the electron transfer of O 2 reduction, and mesoporous carbon (CMK-3) was utilized as a catalyst substrate to provide catalytic active sites. Moreover, feasible mass transfer of O 2 from the hydrophobic to the hydrophilic layer was designed to increase the contact between O 2 and the reaction interface. The H 2 O 2 yield of the ZrO 2 /CMK-3/PTFE cathode was significantly improved by approximately 7.56 times compared to that of the conventional gas diffusion cathode under the same conditions. The H 2 O 2 generation rate and Faraday efficiency reached 125.98 mg·cm − 2 ·h − 1 (normalized to 5674.04 mmol·g − 1 ·h − 1 by catalyst loading) and 78.24% at −1.3 V versus standard hydrogen electrode (current density of −252 mA·cm − 2 ), respectively. The high H 2 O 2 yield ensured that sufficient ·OH was produced for excellent EF performance, resulting in a degradation efficiency of over 96% for refractory organics. This study offers a novel engineering solution for the efficient treatment of refractory wastewater using EF technology based on in situ high-yield H 2 O 2 electrosynthesis.
研究领域:
环境工程
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化学工程
·
水处理
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Pengjin Zeng,Yi Su,Biao Huang,Fei Sun,Feng Zhao,Yuhai Guo
The preparation and development of low-cost and highly ion-selective membranes, are necessary to facilitate the practical application of vanadium redox flow batteries (VRFB). In this study, a polytetrafluoroethylene (PTFE) asymmetric-filled proton exchange membrane was designed and prepared through casting and filling sulfonated poly (ether ether ketone) (SPEEK) attached to the PTFE membrane surface or infiltrated into the membrane matrix, which can synergistically promote proton transport and inhibit vanadium ion permeability. The test results showed that the asymmetrically cast composite membrane (U–S/P/S) had the highest ion selectivity (3.27 × 10 3 S min cm −3 ) and the lowest VO 2+ permeability (1.09 × 10 −8 cm −2 min). In addition, the U–S/P/S composite membrane has excellent VRFB performance with a stable energy efficiency of more than 70 % and ultra-long self-discharge time (141 h) at current density of 80 mA cm −2 , Meanwhile, the maximum power density of U–S/P/S is 871.93 mW cm −2 at 250 mA cm −2 . It is worth mentioning that the U–S/P/S membrane has a more stable battery performance when the U–S surface is oriented toward the negative side of the battery, and the U–S/P/S membrane exhibits more excellent VRFB performance than N212. And highly ion-selective proton exchange membranes with PTFE as the support show great promise for VRFB applications.
研究领域:
材料科学
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电化学
·
能源存储
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高影响因子
危险品化学品经营许可证（带存储）