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N-Doped Carbon Nanofibrous Film with Unique Wettability,Enhanced Supercapacitive Property,and Facile Capacity to Demulsify Surfactant Free Oil-in-water Emulsions

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Chemical Research in Chinese Universities 2021年第3期37卷 436-442页

作者： WANG Ruifang lei weiwei WANG lei LI Zhenyu CHEN Jingyu HU Zhenzhong State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu610500P.R.China Center of Functional Materials for Working Fluids of Oil and Gas Field School of New Energy and MaterialsSouthwest Petroleum UniversityChengdu610500P.R.China Institute for Frontier Materials Deakin UniversityGeelong/MelbourneAustralia Chengdu Evermaterials Co. Ltd.Chengdu610500P.R.China Tianjin Key Laboratory of Clean Energy and Pollutant Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin300401P.R.China

Electrospinning and calcination technique have been combined to fabricate N-doped carbon nanofibers(N-CNFs)by introducing amino grafted few-layered hexagonal boron nitride(amino@BN)into polyacrylonitrile(PAN)matrix as filler followed by *** the high N-doping level(10.7%,atomic fraction)with the final product,the as-prepared N-CNFs exhibit interesting surface wettability(superamphiphilicity in air and underwater oleophilicity).Moreover,compared with pristine PAN derived carbon nanofibers(marked as CNFs),N-CNFs exhibit higher graphic structure under fixed carbonizing temperature as *** these advantages aforementioned,the as-prepared N-CNFs exhibit good specific capacitance(ca.200.1 F/g)without activation treatment at the current density of 0.5 A/g in three-electrode configuration,which is about 149%that of CNFs(ca.134 F/g).What’s more,our N-CNFs also display the unexpected capacity to demulsify diverse surfactant free oil-in-water emulsions by simple filtration in large scale with the high water flux ca.(23578±150)L·m^(−2)·h^(−1).

关键词： Carbon nanofibrous membrane Unique wettability Supercapacitor Demulsification of oil-water emulsion

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Two-dimensional Boron Nitride for Electronics and Energy Applications

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Energy & Environmental Materials 2022年第1期5卷 10-44页

作者： Jiemin Wang Liangzhu Zhang Lifeng Wang weiwei lei Zhong-Shuai Wu School of New Energy and Materials Southwest Petroleum UniversityChengdu Sichuan 610500China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China Institute for Frontier Materials Deakin UniversityWaurn Ponds CampusLocked Bag 20000Geelong Vic.3220Australia Dalian National Laboratory for Clean Energy Chinese Academy of Sciences457 Zhongshan RoadDalian 116023China

Two-dimensional(2D)boron nitride(BN),the so-called“white graphene,”has demonstrated a great potential in various fields,particularly in electronics and energy,by utilizing its wide bandgap(~5.5 eV),superior thermal stability,high thermal conductance,chemical inertness,and outstanding dielectric ***,to further optimize the performances from the view of structure-property relationship,the determinative factors such as crystallite sizes,layer thickness,dispersibility,and surface functionalities should be precisely controlled and ***,in this review,the synthesis and functionalization methods including“top-down”and“bottom-up”strategies,and non-covalent and covalent modifications for 2D BN are systematically classified and discussed at first,thus catering for the requirements of versatile ***,the progresses of 2D BN applied in the fields of microelectronics such as fieldeffect transistors and dielectric capacitors,energy domains such as thermal energy management and conversion,and batteries and supercapacitors are summarized to highlight the importance of 2D ***,these contents not only contain the state-of-the-art 2D BN composites,but also bring the current novel design of 2D BN-based microelectronic ***,the challenges and perspectives are proposed to better broaden the scope of this ***,this review will pave an all-around way for understanding,utilizing,and applying 2D BN in future electronics and energy applications.

关键词： boron nitride electronics energy functionalization nanosheets two-dimensional materials

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Enhanced Visible-light Photocatalytic Activity of g-C3N4/Nitrogen-doped Graphene Quantum Dots/TiO2 Ternary Heterojunctions for Ciprofloxacin Degradation with Narrow Band Gap and High Charge Carrier Mobility

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Chemical Research in Chinese Universities 2020年第6期36卷 1083-1090页

作者： CHEN Ting ZHONG lei YANG Zhen MOU Zhigang LIU lei WANG Yan SUN Jianhua lei weiwei School of Chemistry and Environmental Engineering Institute of Advanced Functional Materials for EnergyJiangsu University of TechnologyChangzhou 213001P.R.China Institute for Frontier Materials Deakin UniversityWaurn PondsVictoria 3216Australia

Limited visible-light absorption and high recombination rate of photogenerated charges are two main drawbacks in g-C3Na-based *** solve these problems,g-CN4/nitrogen-doped graphene quantum dots(NGQDs)/TiO2 ternary heterojunctions were facilely prepared via a one-step calcining *** ***,optical and electrochemical properties of g-C3NA/NGQDs/TiO2 were characterized and *** optimal g-CN4/NGODs/TiOz composite exhibits enhanced photocatalytic degradation performance of ciprofloxacin(CIP)compared with the as-prepared ***:(P25)and g-C3N4/TiO2 heterojunction under visible light *** apparent rate constant of the composite is around 6.***.4.03 and 2.30 times higher than those of g-C3N4,TiOz and g-C3N4/TiO2,*** enhanced photocatalytic efficiency should be mainly attributed to the improvement of light absorption and charge separation and transfer efficiency,originating from the narrow band gap and high charge carrier *** active species trapping experiments results showed that the ht and'02 were the main active species in the degradation process.A possible photocatalytic reaction mechanism of the g-C3N4/NGODs/TiO2 composite for the enhanced degradation of CIP under visible light irradiation was also proposed.

关键词： g-C3N4/NGQDs/TiO2 Heterojunction Photocatalysis Antibiotic ciprofloxacin

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Microstructure and Mechanical Properties of Pure Magnesium Subjected to Hot Extrusion

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Journal of Wuhan University of Technology(Materials Science) 2019年第5期34卷 1193-1196页

作者： lei weiwei WANG Hongxia LIANG Wei School of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of Advanced Magnesium-based Materials Taiyuan University of TechnologyTaiyuan 030024China School of Mechanical Engineering Luoyang Institute of Science and TechnologyLuoyang 471023China

The as-cast pure magnesium(Mg), with a purity of 99.99%, was hot-extruded at 300 ℃ to prepare a Mg bar with a diameter of 8 mm. The microstructure and mechanical properties of the sample before and after extrusion were investigated. The results show that the as-extruded microstructure is obviously refined with a large number of subgrains rather than equiaxed grains. A great number of(102) tensile twins can be observed significantly in the microstructure at the temperature. Mechanical properties including yield strength(YS) and ultimate tensile strength(UTS) increase greatly but uniform elongation(UE) decreases slightly as a result of work hardening.

关键词： microstructure pure Mg mechanical properties hot extrusion

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Mannonic Acid and Bio-Ethanol Production from Konjac Using a Two-Step Bioprocess with Candida Shehatae and Gluconobacter Oxydans

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Journal of Renewable Materials 2020年第1期8卷 79-88页

作者： Jianglin Zhao Xiaotong Zhang weiwei lei Xingqi Ji Xin Zhou Yong Xu College of Chemical Engineering Nanjing Forestry UniversityNanjing210037China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing210037China

Amorphophallus konjac is rich in glucomannan,which can be hydrolyzed into glucose and mannose,thereby acting as an economic raw material for the acquisition of glucose and *** total sugar yield was 91.2%when konjac powder was treated with 0.75%hydrochloric acid at 121℃for 1 ***,dilute acid hydrolysates of konjac powder were used as a carbon source for obtaining value-added *** we showed that the microbial production of ethanol and mannonic acid was obtained by employing Candida shehatae(***)and Gluconobacter oxydans(***).Through a step-by-step bioprocess,glucose is the first selectively converted to ethanol by ***,which enables ***-mediated biocatalysis of mannose to mannonic ***,approximately 100 g ethanol and 340 g mannonic acid were produced starting from 1 kg refined konjac *** results demonstrated the feasibility of this bioconversion method for producing mannonic acid starting from crude hydrolysates of konjac powder.

关键词： Konjac mannonic acid ethanol Gluconobacter oxydans Candida shehatae

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Synthesis and evaluation of bio-based elastomer based on diethyl itaconate for oil-resistance applications

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Science China Chemistry 2016年第11期59卷 1376-1383页

作者： weiwei lei He Qiao Xinxin Zhou Wencai Wang Liqun Zhang Runguo Wang Kuo-Chih Hua State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Key Laboratory of Beijing City for Preparation and Processing of Novel Polymer Materials Beijing University of Chemical Technology Engineering Center of Ministry of Education on Elastomer Materials Energy Saving and Resource Utilization Beijing University of Chemical Technology Goodyear Innovation Center Goodyear Tire & Rubber Co.

Bio-based elastomer poly(diethyl itaconate-co-isoprene)(PDEII) was designed and synthesized by redox-initiated emulsion polymerization from diethyl itaconate and isoprene with mass ratio of 20:80, 40:60, 60:40 and 80:20. The number-average molecular weights of PDEII exceeded 140000 with relatively high yields. The physical properties of PDEII, such as glass transition temperatures and thermostability, were comparable with conventional synthetic elastomers and can be readily tuned by varying the ratio of diethyl itaconate to isoprene. The interaction between silica and PDEII macromolecules was effectively enhanced with the increase of diethyl itaconate content by endowing high polarity. The oil-resistance relevant properties of silica/PDEII80(80% diethyl itaconate, 20% isoprene) such as retention of tensile strength, retention of elongation at break and change in volume even surpass those of silica/NBR 240 S after soaked in ASTM 3# oil at different temperatures.

关键词： bio-based elastomer synthesis oil-resistance

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A Thermochromic, Viscoelastic Nacre-like Nanocomposite for the Smart Thermal Management of Planar Electronics

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Nano-Micro Letters 2023年第10期15卷 182-196页

作者： Jiemin Wang Tairan Yang Zequn Wang Xuhui Sun Meng An Dan Liu Changsheng Zhao Gang Zhang weiwei lei College of Biomedical Engineering Sichuan UniversityChengdu 610064People’s Republic of China Institute for Frontier Materials Deakin UniversityWaurn Ponds CampusLocked Bag 20000GeelongVictoria 3220Australia College of Mechanical and Electrical Engineering Shaanxi University of Science and TechnologyXi’an 710021People’s Republic of China State Key Laboratory of Polymer Materials Engineering College of Polymer Science and EngineeringSichuan UniversityChengdu 610065People’s Republic of China Institute of High Performance Computing A*STAR Singapore 138632Singapore

Cutting-edge heat spreaders for soft and planar electronics require not only high thermal conductivity and a certain degree of flexibility but also remarkable self-adhesion without thermal interface materials, elasticity, arbitrary elongation along with soft devices, and smart properties involving thermal self-healing, thermochromism and so on. Nacre-like composites with excellent in-plane heat dissipation are ideal as heat spreaders for thin and planar electronics. However, the intrinsically poor viscoelasticity, i.e., adhesion and elasticity, prevents them from simultaneous self-adhesion and arbitrary elongation along with current flexible devices as well as incurring high interfacial thermal impedance. In this paper, we propose a soft thermochromic composite(STC) membrane with a layered structure, considerable stretchability, high in-plane thermal conductivity(~30 Wm^(-1) K^(-1)), low thermal contact resistance(~12 mm^2 KW^(-1), 4–5 times lower than that of silver paste), strong yet sustainable adhesion forces(~4607 Jm^(-2), 2220 Jm^(-2) greater than that of epoxy paste) and self-healing efficiency. As a self-adhesive heat spreader, it implements efficient cooling of various soft electronics with a temperature drop of 20℃ than the polyimide case. In addition to its self-healing function, the chameleon-like behavior of STC facilitates temperature monitoring by the naked eye, hence enabling smart thermal management.

关键词： Boron nitride nanosheets Nacre-inspired composites Viscoelastic Thermochromic Smart thermal management

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Design and synthesis by redox polymerization of a bio-based carboxylic elastomer for green tire

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Science China Chemistry 2015年第10期58卷 1561-1569页

作者： Xinxin Zhou Runguo Wang weiwei lei He Qiao Haoling Ji Liqun Zhang Kuo-Chih Hua Joseph Kulig State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Key Laboratory of Beijing City for Preparation and Processing of Novel Polymer Materials Beijing Laboratory of Biomedical Materials Goodyear Innovation Center Goodyear Tire & Rubber Company

Poly(dibutyl itaconate-co-isoprene-co-methacrylic acid)(PDIM) elastomer was designed and synthesized by redox emulsion polymerization under mild conditions. PDIM has high molecular weight, relatively high yield, and low glass transition temperature(Tg). The structure of PDIM was determined by FTIR and NMR, and the carboxyl content was obtained by titration in a non-proton solvent. Tensile strength and elongation at break increased with increasing carboxyl content. In addition, the interaction between PDIM and silica was elucidated by rubber process analyzer(RPA) and TEM, and the results showed that the silica-PDIM interaction was strong, but the silica-silica interaction was weak.

关键词： carboxylic rubber bio-based elastomer synthesis redox polymerozation green tire

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Preparation and applications of calcium ferrite as a functional material:A review

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 292-310页

作者： Xiuli Han Bowen Duan lei Liu Shilong Fang weiwei Wang College of Mining Engineering North China University of Science and TechnologyTangshan 063210China Collaborative Innovation Center of Green Development and Ecological Restoration of Mineral Resources of Hebei Province Tangshan 063210China Key Laboratory of Mining Development and Security Technology of Hebei Province Tangshan 063210China

Calcium ferrite(CF)is recognized as a potential green and efficient functional material because of its advantages of magnetism,electrochemistry,catalysis,and biocompatibility in the fields of materials chemistry,environmental engineering,and ***-fore,the obtained research results need to be systematically summarized,and new perspectives on CF and its composite materials need to be *** on the presented studies of CF and its composite materials,the types and structures of the crystal are *** addition,the current application technologies and theoretical mechanisms with various properties in different fields are ***,the various preparation methods of CF and its composite materials are elaborated in *** importantly,the advantages and disadvantages of the synthesis methods of CF and its composite materials are discussed,and the existing problems and emerging challenges in practical production are ***,the key future research directions of CF and its composite materials have been prospected from the potential application technologies to provide references for its synthesis and efficient utilization.

关键词： calcium ferrite mineral functional materials preparation application perspectives

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Design and preparation of a crosslinkable,oil-resistant,and bio-based elastomer from fumarate

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Science China Chemistry 2024年第2期67卷 622-631页

作者： Hui Yang Haijun Ji Xinxin Zhou Shihan Yang Liwei Li Chaoying Sun weiwei lei Runguo Wang Liqun Zhang Beijing State Key Laboratory of Organic-Inorganic Composites&Beijing Laboratory of Biomedical Materials Beijing University of Chemical TechnologyBeijing100029China Hubei Key Laboratory of Polymer Materials Faculty of Materials Science and EngineeringHubei UniversityWuhan430062China

Poly(diethyl fumarate-co-methoxyethyl acrylate-co-vinyl chloroacetate)(PDEFMV),a novel bio-based elastomer with a saturated structure,was synthesized via redox emulsion *** glass-transition temperatures of PDEFMV,adjusted through the variation of the diethyl fumarate-to-methoxyethyl acrylate feeding ratio,ranged from-36.1 to-14.8 ℃.The number-average molecular weights of PDEFMV ranged from 384,000 to 46,000 g/*** designing the molecular structure,vinyl chloroacetate was used to provide active sites for subsequent vulcanization and *** active chlorine groups within the PDEFMV chain reacted with the crosslinking agent trithiocyanuric acid under high temperature and pressure to form a nonsulfur crosslinked three-dimensional network *** achieve the desired properties,carbon black(CB,N330) was incorporated to reinforce PDEFMV,leading to the formation of PDEFMV/CB composites.A comprehensive study was conducted on the high-temperature oil resistance of PDEFMV/CB *** immersion in IRM903 oil at temperatures of 150 and 200 ℃ for 72 h,the mass and volume changes in PDEFMV/CB were lower than those observed in commercially available acrylate rubber(AR)/CB,indicating that PDEFMV exhibited superior oil ***,the aging characteristics and mechanisms of oil resistance in the PDEFMV/CB and AR/CB composites were investigated at different temperatures(150,200,and 250 ℃).The results provide insights into the operational temperature ranges suitable for PDEFMV/CB and offer valuable guidance for potential industrial applications.

关键词： diethyl fumarate molecular design bio-based elastomer solvent-free synthetic route high-temperature oil resistance

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