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MXene-assisted polymer coating from aqueous monomer solution towards dendrite-free zinc anodes

Journal of Energy Chemistry 2022年第10期31卷 277-284,I0006页

作者： Ning Wang Zhitan Wu Yu Long Derong Chen Chuannan Geng Xiaochen Liu Daliang Han Jing Zhang Ying Tao Quan-Hong Yang Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou 350207FujianChina Renai College of Tianjin Tianjin 301636China

coating polymer on the surface is an effective way to realize functional modification of the materials for diverse applications,which has been proved to enhance the stability of metal anodes in ***,given the limited operability of coating from polymer dispersions,it is imperative to develop simple aqueous-based strategies from monomers for versatile polymer ***,a Ti_(3)C_(2)Tx MXene-assisted approach is proposed to construct polymer coating on zinc metal surfaces directly from the aqueous solution of monomers in an ice *** combining a doctor-blading method with spontaneous polymerization of monomers on the substrates at room temperature,a uniform,adhesive,and versatile coating layer assisted by a small amount of MXene is produced in one ***,MXene nanosheets serve as nanofillers to further enhance the mechanical strength and ionic conductivity of the polymer *** from good film formation and improved interfacial contact,the coated zinc anode exhibits a long cycling lifespan of over 1900 *** assembled full cells show excellent cycling stability with a high capacity retention of 85.0%at 16 A g^(-1)over 2600 *** work provides a simple and efficient way to produce polymer coatings directly from monomers,which may give new insights into design multifunctional polymer coatings for various applications.

关键词： MXene polymer coating Monomer Zinc anode Dendrite-free

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Mechanism of thermoviscoelasticity driven solid-liquid interface reducing friction for polymer alloy coating

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Friction 2023年第9期11卷 1606-1623页

作者： Sheng TAN Yimin LUO Junhua YANG Wei WANG Xia LI Baoguang JIA Zhuangzhu LUO Guangan ZHANG School of Materials Sun Yat-sen UniversityShenzhen 518107China The 14th Research Institute of China Electronics Technology Group Corporation Nanjing 210039China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

High-temperature ablation is a common failure phenomenon that limits the service life of the transmission parts on heavy-duty machines used in heavy load,high temperature,high shock conditions due to in-sufficient supply of lubricating oil and *** self-lubricating coatings prepared by inorganic,organic or organic-inorganic hybrid methods are prone to be oxidated at high temperatures to lose their friction reducing function,so that it is difficult to meet the engineering requirements of high-temperature *** design viscoelastic polymer coatings by a high-temperature self-lubricating and wear-resistant ***(PTFE,T_(m)=329℃)and polyphenylene sulfide(PPS,T_(g)=84℃,T_(m)=283℃)are used to prepare a PTFE/PPS polymer alloy *** the temperature increases from 25 to 300℃,the PTFE/PPS coating softens from glass state to viscoelastic state and viscous flow state,which is owing to the thermodynamic transformation characteristic of the PPS *** the friction coefficient(μ)decreased from 0.096 to 0.042 with the increasing of temperature from 25 to 300℃.The mechanism of mechanical deformation and surface morphology evolution for the PTFE/PPS coating under the multi-field coupling action of temperature(T),temperature–centrifugal force(T–F_(ω)),temperature–centrifugal force–shearing force(T–F_(ω)–F_(τ))were *** physical model of“thermoviscoelasticity driven solid–liquid interface reducing friction”is proposed to clarify the self-lubricating mechanism determined by the high-temperature viscoelastic properties of *** high-temperature adjusts the viscosity(η)of the coating,increases interface slipping and intensifies shear deformation(τ),reducing the friction *** result is expected to provide a new idea for designing anti-ablation coatings served in high temperature friction and wear conditions.

关键词： self-lubricating polymer coating viscoelastic state solid-liquid interface friction reduction hightemperature tribology

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Effects of polymer coating on the Properties of Surface Layer Concrete

Effects of Polymer Coating on the Properties of Surface Laye...

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2011中国材料研讨会

作者： L.Shi,J.Z.Liu,J.P.Liu

polymer coating is progressively being used in fields of concrete curing and concrete surface *** there is rare study been performed to investigate the effects of polymer coating on the properties of surface layer *** effects of polymer coating on shrinkage,mechanical property,carbonation,capillary absorption and chloride ion diffusion of surface layer concrete were *** results show that polymer coating can obviously reduce shrinkage of surface layer mortar.A thicker polymer coating gets a greater shrinkage reducing ratio at early *** coating can improve the early age strength of surface layer mortar compared with the specimens cured under standard ***,the carbonation resistance of surface layer concrete,as well as the infiltration resistance of surface layer mortar can be improved by polymer *** results also demonstrate that the capillary absorption ratio of mortar coated with polymer can be reduced by 87% and 78% respectively when compared with dry and standard curing *** the same way,polymer coating has an improvement effect on chloride ion diffusion resistance of surface layer concrete.

关键词： polymer coating shrinkage carbonation capillary absorption chloride ion diffusion

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Femtosecond laser-mediated anchoring of polymer layers on the surface of a biodegradable metal

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Journal of Magnesium and Alloys 2021年第4期9卷 1380-1388页

作者： Jaeho Park Bo-In Park Young Ju Son Sun Hee Lee Seung-Hoon Um Yu-Chan Kim Myoung-Ryul Ok Jeong-Yun Sun Hyung-Seop Han Hojeong Jeon Center for Biomaterials Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Materials science and Engineering Seoul National University(SNU)Seoul 08826Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Division of Bio-Medical Science and Technology KIST SchoolKorea University of Science and TechnologySeoul 02792Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea

Mg has received much attention as a next-generation implantable material owing to its biocompatibility,bone-like mechanical properties,and biodegradability in physiological *** application of various polymer coatings has been conducted in the past to reduce the rapid formation of hydrogen gas and the local change in pH during the initial phase of the chemical reaction with the body ***,we propose femtosecond(fs)laser-mediated Mg surface patterning for significant enhancement of the binding strength of the coating material,which eventually reduces the corrosion *** of the structural,physical,crystallographic,and chemical properties of the Mg surface have been conducted in order to understand the mechanism by which the surface adhesion increases between Mg and the polymer coating *** on the fs laser conditions,the surface structure becomes rough owing to the presence of several microscaled pits and grooves of nanoporous MgO,resulting in a tightly bonded poly(lactic-co-glycolic acid)(PLGA)*** corrosion rate of the PLGA-coated,fs laser-treated Mg is considerably slow compared with the non-treated Mg;the treated Mg is also more biocompatible compared with the non-treated *** fs laser-based surface modification technique offers a simple and quick method for introducing a rough coating on Mg;further,it does not require any chemical treatment,thereby overcoming a potential obstacle for its clinical use.

关键词： Femtosecond laser Biodegradable metal polymer coating Surface modification Surface adhesion

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polymer transfer film formation from cryogenic to elevated temperatures

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Friction 2024年第9期12卷 2018-2032页

作者： Kian BASHANDEH Vasilis TSIGKIS Ahmad AMIRI Pixiang LAN Andreas A.POLYCARPOU J.Mike Walker’66 Department of Mechanical Engineering Texas A&M UniversityCollege StationTexas 77843USA ATSP Innovations Inc.HoustonTexas 77055USA Russell School of Chemical Engineering The University of TulsaTulsaOklahoma 74104USA Department of Mechanical Engineering The University of TulsaTulsaOklahoma 74104USA

This study reports on the tribological performance of aromatic thermosetting co-polyester(ATSP)and polyether ether ketone(PEEK)-based polymer composite coatings mixed with PTFE *** coatings were tested across a wide temperature range from−180 to 110℃ to simulate the environmental temperatures on Titan,Moon,and Mars,which are of particular interest for NASA’s future exploratory *** experimental setup was developed to conduct the pin-on-disk experiments under dry sliding conditions and extreme temperature and contact *** film formation and its characteristics were found to play significant roles in the tribological performance,and the characteristics of the film were *** XPS and SEM analysis indicated the increase of the PTFE content in the transfer film as the temperature decreased to cryogenic *** coefficient of friction did not follow a linear trend with temperature and was minimum at 110℃ and maximum at−180℃.ATSP coating showed superior performance with lower friction and unmeasurable wear at all temperatures,whereas PEEK coating exhibited maximum wear at 25℃ followed by−180,and 110℃.

关键词： transfer film cryogenic high temperature tribology space tribology polymer coating

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Bionic Research on Fish Scales for Drag Reduction

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Journal of Bionic Engineering 2012年第4期9卷 457-464页

作者： Zhaoliang Dou Jiadao Wang Darong Chen State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084P.R.China

To reduce friction drag with bionic method in a more feasible way, the surface microstructure of fish scales was analyzed attempting to reveal the biologic features responding to skin friction drag reduction. Then comparable bionic surface mimicking fish scales was fabricated through coating technology for drag reduction. The paint mixture was coated on a substrate through a self-developed spray-painting apparatus. The bionic surface with micron-scale caves formed spontaneously due to the interra- cial convection and deformation driven by interfacial tension gradient in the presence of solvent evaporation. Comparative experiments between bionic surface and smooth surface were performed in a water tunnel to evaluate the effect of bionic surface on drag reduction, and visible drag reduction efficiency was obtained. Numerical simulation results show that gas phase de- velops in solid-liquid interface of bionic surface with the effect of surface topography and partially replaces the solid-liquid shear force with gas-liquid shear force, hence reducing the skin friction drag effectively. Therefore, with remarkable drag re- duction performance and simple fabrication technology, the proposed drag reduction technique shows the promise for practical applications.

关键词： drag reduction micro-structured bionic surface fish scales polymer coating interfacial convection and deformation

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Cow dung-derived biochars engineered as antibacterial agents for bacterial decontamination

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Journal of Environmental Sciences 2021年第7期33卷 33-43页

作者： Quanfu Yao Qinggele Borjihan Huihui Qu Yixuan Guo Ziying Zhao Long Qiao Ting Li Alideertu Dong Ying Liu College of Life and Environmental Sciences Minzu University of ChinaBeijing 100081China College of Chemistry and Environment Hohhot Minzu CollegeHohhot 010051China College of Chemistry and Chemical Engineering Inner Mongolia UniversityHohhot 010021China Engineering Research Center of Dairy Quality and Safety Control Technology Ministry of EducationInner Mongolia UniversityHohhot 010021China

Disposal of the pollutants arising from farming cattle and other livestock threatens the environment and public safety in diverse ***,we report on the synthesis of engineered biochars using cow dung as raw material,and investigating these biochars as antibacterial agents for water *** coating the biochars with N-halamine polymer and loading them with active chlorine (i.e.,Cl+),we were able to regulate them on demand by tuning the polymer coating and bleaching *** obtained N-halamine-modified biochars were found to be extremely potent against Escherichia coli and Staphylococcus *** also investigated the possibility of using these N-halamine-modified biochars for bacterial decontamination in real-world *** findings indicated that a homemade filter column packed with N-halamine-modified biochars removed pathogenic bacteria from mining sewage,dairy sewage,domestic sewage,and artificial *** proposed strategy could indicate a new way for utilizing livestock pollutants to create on-demand decontaminants.

关键词： Cow dung Biochars polymer coating Antibacterial agent Bacterial decontamination

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Corrosion resistance and superhydrophobicity of one-step polypropylene coating on anodized AZ31 Mg alloy

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Journal of Magnesium and Alloys 2021年第4期9卷 1452-1466页

作者： Zhao-Qi Zhang Li Wang Mei-Qi Zeng Rong-Chang Zeng Cun-Guo Lin Zhen-Lin Wang Dong-Chu Chen Qiang Zhang Corrosion Laboratory for Light Metals College of Material Science and EngineeringShandong University of Science and TechnologyQingdao 266590China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteQingdao 266101China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China College of Materials Science and Engineering Chongqing University of TechnologyChongqing 400065China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

Superhydrophobic coatings have been considerably used in corrosion and its protection of metallic *** the comprehensive performance(hydrophobicity,bonding strength,and corrosion resistance,etc.)of the top coating may be highly dependent on the physical and chemical properties of the primer or under ***,an integrated superhydrophobic polypropylene(PP)coating was fabricated on the micro-arc oxidized Mg substrate via one-step *** morphologies and chemical compositions of the composite coating were examined through Fourier transform infrared spectroscopy(FT-IR),X-ray diffraction(XRD),and field-emission scanning electron microscopy(FESEM)together with X-ray photoelectron spectroscopy(XPS).The surface wettability of the coating was determined by contact angle and sliding *** corrosion-resistant performance was evaluated via electrochemical and immersion *** results showed that the hybrid coating possessed micron-scaled granular structure on the surface with a high water contact angle of 167.2±0.8°and a low water sliding angle of 2.7±0.5°.The corrosion resistance of superhydrophobic coating was obviously enhanced with a low corrosion current density of 8.76×10^(−9)A/cm^(2),and the coating still maintained integrity after 248 h of immersion in 3.5wt%NaCl aqueous *** MAO coating provides better adhesion of PP to the ***,the superhydrophobic coating exhibited superior bonding strength,corrosion resistance and durability.

关键词： Magnesium alloy Corrosion resistance Superhydrophobicity Bonding strength polymer coating

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Corrosion resistance of a silane/ceria modified Mg-Al-layered double hydroxide on AA5005 aluminum alloy

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Frontiers of Materials Science 2019年第4期13卷 420-430页

作者： Wei WU Fen ZHANG Yu-Chao LI Yong-Feng ZHOU Qing-Song YAO Liang SONG Rong-Chang ZENC Sie Chin TJONG Dong-Chu CHEN College of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252059China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450002China Department of Physics City University of Hong KongTat Chee AvenueHong KongChina School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

The present work aimed at assessing the electrochemical behavior and the corrosion inhibition performance of Mg-Al-layered double hydroxide(LDH)coatings modified with methyltrimethoxysilane(MTMS)and cerium nitrate on AA5005 aluminum *** chemical compositions and surface morphologies of the coatings were investigated by XRD,FT-IR and FE-SEM,while their corrosion resistance was evaluated by electrochemical and immersion *** optimum corrosion resistance of the composite coatings was obtained by adding 10^−2 mol·L^−1 cerium *** excess addition of cerium nitrate resulted in a loose structure and poor corrosion resistance of the *** corrosion mechanism of the composite coatings was proposed and discussed.

关键词： aluminum alloy layered double hydroxide polymer coating cerium oxide corrosion resistance

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Superhydrophobic surface of Mg alloys:A review

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Journal of Magnesium and Alloys 2018年第1期6卷 59-70页

作者： M.Yeganeh N.Mohammadi Department of Materials Science and Engineering Faculty of EngineeringShahid Chamran University of AhvazAhvazIran

In the present review,the formation of superhydrophobic(SHP)structures on the surface of Mg alloys was *** methods including hydrothermal technique,chemical and electrochemical deposition,conversion and polymer coating,and etching routes were *** superhydrophobicity could form on the surface of Mg alloys by the application of different chemical,electrochemical,and physical methods followed by the immersion of these alloys in the solution containing modifying agents including fatty acids or long-chain *** formed morphology,composition,and contact angle were reported and the effect of synthesis route on these characteristics was reviewed.

关键词： Mg alloys Superhydrophobic surfaces Chemical deposition Electrochemical coating Conversion coating polymer coating Etching

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