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Surface Characteristics of Rare Earth Treated Carbon Fibers and interfacial properties of Composites

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Journal of Rare Earths 2007年第4期25卷 462-468页

作者：徐志伟黄玉东宋元军张春华刘丽 Department of Applied Chemistry Harbin Institute of Technology

Effect of rare earth treatment on surface physicochemical properties of carbon fibers and interfacial properties of carbon fiber/epoxy composites was investigated, and the interfacial adhesion mechanism of treated carbon fiber/epoxy composite was analyzed. It was found that rare earth treatment led to an increase of fiber surface roughness, improvement of oxygeaa-containing groups, and introduction of rare earth element on the carbon fiber surface. As a result, coordination linkages between fibers and rare earth, and between rare earth and resin matrix were formed separately, thereby the interlaminar shear strength （ILSS） of composites increased, which indicated the improvement of the interfacial adhesion between fibers and matrix resin resulting from the increase of carboxyl and carbonyl.

关键词： carbon fiber/epoxy composite interfacial properties X-ray photoelectron spectroscopy rare earths

Nanomechanical and Chemical Mapping of the Structure and interfacial properties in Immiscible Ternary Polymer Systems

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Chinese Journal of Polymer Science 2021年第6期39卷 651-658,I0004页

作者： Hao-Xuan Li Thomas PRussell Dong Wang State Key Laboratory of Organic-Inorganic Composites&Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Polymer Science and Engineering Department University of Massachusetts AmherstMassachusetts 01003United States Materials Sciences Division Lawrence Berkeley National Laboratory1 Cyclotron RoadBerkeleyCalifornia 94720United States

It is a challenge to identify each phase in a multi-component polymer system and uniquely determine the interfacial properties between the different *** atomic force microscopy nanomechanical mapping(AFM-NM)and AFM-based infrared spectroscopy(AFM-IR),we identify each phase,visualize structural developments,and determine the interfacial properties in a blend of three polymers:high-density polyethylene(HDPE),polyamide(PA6)and poly(styrene-b-ethylene-co-butylene-b-styrene)(SEBS).Each phase can be identified from the Young’s modulus,along with the structural development within the phases before and after *** interfacial widths between HDPE/PA6,HDPE/SEBS and SEBS/PA6 were determined independently in one measurement from a Young’s modulus *** structural,mechanical property development and identity of the phases were determined by AFM-NM,while AFM-IR,providing complementary chemical information,identified interfacial reactions,showed the chemical affinity of a compatibilizer with the component phases,and mapped the distribution of the compatibilizer in the ternary polymer *** chemical,structural and interfacial information obtained by these measurements provide information that is essential for producing mechanically robust materials from incompatible mixtures of polymers.

关键词： AFM nanomechanical mapping AFM infrared spectroscopy Multi-component systems interfacial structure interfacial properties

Synthesis and interfacial properties of Bio-Based Zwitterionic Surfactants Derived from Different Fatty Acids in Non-Edible Vegetable Oils

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Journal of Renewable Materials 2020年第4期8卷 417-429页

作者： Hongze Gang Qiqi Zhang Wei Wang Bangxin Cai Jinfeng Liu Shizhong Yang Bozhong Mu State Key Laboratory of Bioreactor Engineering School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai200237China Engineering Research Center MEOR-MOE Shanghai Collaborative Innovation Center for Biomanufacturing TechnologyEast China University of Science and TechnologyShanghai200237China

Waste cooking oils and non-edible vegetable oils are abundant and renewable resources for bio-based materials which have showed great potential applications in many *** this study,five fatty acids commonly found in non-edible vegetable oils,including palmitic acid,stearic acid,linoleic acid,linolenic acid,ricinoleic acid,and their mixtures,were used to produce bio-based zwitterionic surfactants through a facile and high-yield chemical *** surfactants demonstrated excellent surface/interfacial properties with the minimum surface tensions ranging from 28.4 mN/m to 32.8 mN/m in aqueous *** interfacial tensions between crude oil and surfactant solutions were remarkably reduced to lower values ranging from 0.0028 mN/m to 0.1983 mN/m without the aid of extra alkali,which particularly implied a great potential application in enhanced oil ***,these bio-based surfactants also showed good wetting properties(contact angles of~51°comparing with that of double distilled water,92.04°)and appropriate predicted biodegradability(degradation order of“weeks”for bio-based surfactants synthesized from saturated fatty acids,and“months”for those synthesized from unsaturated fatty acids).Bio-based surfactants synthesized from unsaturated fatty acids showed better interfacial properties in reducing interfacial tension between crude oil and formation *** bio-based surfactants presented in this study are alternative substitutes for traditional petroleum-based surfactants in various surfactant application fields.

关键词： Bio-based surfactants zwitterionic surfactants fatty acid non-edible oil interfacial properties

Investigation of the interfacial properties for CO_2-methanol and CO_2-ethanol mixtures

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Science China Chemistry 2011年第5期54卷 856-862页

作者： FU Dong School of Environmental Science and Engineering North China Electric Power UniversityBaoding 071003China

An equation of state (EOS) applicable for the interfacial properties of CO2-methanol and CO2-ethanol mixtures was established by combining the cross-association EOS and the density gradient theory (DGT). The correlated surface tensions of CO2-ethanol mixtures agreed well with the experimental data. The results illustrated the temperature and pressure dependence of the cross-association between CO2 and alcohol hydroxyls in the whole vapor-liquid surface,and the influence of the cross-association on the calculation of the surface tensions of binary mixtures.

关键词： CO2-methanol CO2-ethanol cross-association density gradient theory interfacial properties

Effects of Different Heavy Crude Oil Fractions on the Stability of Oil-in-Water Emulsion——Ⅲ. Effects of pH on the interfacial properties of heavy crude functional fractions and water system

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Petroleum Science 2005年第2期2卷 103-106,111页

作者： FanWeiyu NanGuozhi LiShuiping SongYuanming ChinaUniversityofPetroleum DongyingShandong257061China

In this paper, effects of pH on the interfacial properties of heavy crude functional fractions and water system are investigated. The influence of pH on π-A isotherms of acid fraction, basic fraction, amphoteric fraction and asphaltene is great. The interfacial pressure of fractions increases in strongly basic conditions. The ζ (-80mv) of acid fraction is the largest under basic conditions (pH=11-12), with the result to show that the interfacial activity of the acid fraction is superior to that of other fractions. The results of model emulsions show that strongly basic conolition (pH≥11) is beneficial to oil-in- water emulsion stability. The interfacial activity of acid fraction and asphaltene is superior to that of other crude fractions.

关键词： pH value stable factors of emulsion interfacial properties

interfacial and electrical properties of HfAlO/GaSb metal-oxide-semiconductor capacitors with sulfur passivation

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Chinese Physics B 2014年第1期23卷 431-435页

作者：谭桢赵连锋王敬许军 Tsinghua National Laboratory for Information Science and Technology Institute of Microelectronics Tsinghua University

interfacial and electrical properties of HfAlO/GaSb metal-oxide-semiconductor capacitors(MOSCAPs) with sulfur passivation were investigated and the chemical mechanisms of the sulfur passivation process were carefully studied. It was shown that the sulfur passivation treatment could reduce the interface trap density Ditof the HfAlO/GaSb interface by 35% and reduce the equivalent oxide thickness(EOT) from 8 nm to 4 nm. The improved properties are due to the removal of the native oxide layer, as was proven by x-ray photoelectron spectroscopy measurements and high-resolution cross-sectional transmission electron microscopy(HRXTEM) results. It was also found that GaSb-based MOSCAPs with HfAlO gate dielectrics have interfacial properties superior to those using HfO2 or Al2O3 dielectric layers.

关键词： HfAlO GaSb metal-oxide-semiconductor capacitors interfacial properties

Mechanical and interfacial properties of Carbon Fiber/Epoxy and their Composites for Automobile Lightweight

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Mechanical and Interfacial Properties of Carbon Fiber/Epoxy ...

interfacial properties of nano TiO_(2) and cellulose paper coating

2018中国汽车工程学会年会

作者： GAO Cong ZHANG Jinsheng LIU Chuan WANG Zhibai Changan Auto Global R＆D Center Changan Automobile Co.LTD

Carbon fiber reinforced plastics（CFRP） have attracted more and more attention in automobile lightweight areas,owing to the outstanding properties including lightweight,high strength,great damping,collision performance and fatigue ***,material selection methods and property standards for carbon fiber and epoxy are limited in the automobile area,which has negative effect on the development of CFRP *** this paper,mechanical properties of carbon fiber of 2 companies and epoxy of 5 companies were firstly characterized and ***,corresponding composites were prepared and the carbon fiber/epoxy system was selected according to the mechanical and interfacial properties of the ***,compared to the carbon fiber/epoxy system of BMW i3,the selected carbon fiber/epoxy system has considerable performance,which can ensure the feasibility of the material *** conclusion,the mechanical properties of carbon fiber,epoxy and their composites were systematically investigated,which provides valuable reference to the development of CFRP components for automobile lightweight.

关键词： automobile lightweight carbon fiber composites mechanical properties interfacial properties

来源： cnki会议评论

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Journal of Bioresources and Bioproducts 2016年第4期1卷 199-206页

作者： Yingzheng Liu Bin Li Youming Li Helen Ocampo CAS Key Laboratory of Bio-based Material Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of SciencesQingdao 266101China Mudanjiang Hengfeng Paper Co. LtdMudanjiang 157013China State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou510640China Limerick Pulp and Paper center University of New BrunswickFredericton New BrunswickCanada

This paper examined different kinds of organic functional groups that were introduced onto the surface of nano TiO_(2) by surface modification with different types of zircoaluminate coupling *** modified nanoTiO_(2) products with different interfacial properties were obtained,and the impact of the interfacial properties of nanoTiO_(2) on the rheological behavior of paper coating and the properties of coated paper was systematically *** steady shear rheological results showed that the paper coatings containing nano TiO_(2) exhibited a pseudoplastic fluid behavior,characterized as obvious shear *** to the hydrophilic unmodified nano TiO_(2),modified nano TiO_(2) could contribute more to the viscosity of paper *** study on the dynamic viscoelasticity revealed that,through the enhancing action among each component in paper coatings,the modified nano TiO_(2) with quaternary amine groups or carboxyl led to a higher dynamic elastic storage modulus and viscous loss modulus of paper *** addition,SEM and AFM analyses indicated that adding modified nano TiO_(2) products in paper coating could improve the coating structure,thus ameliorating the optical properties and printability of coated *** results obtained could provide a good reference for the application of nano pigments in paper coating.

关键词： Nano TiO_(2) Surface modification Zircoaluminate coupling agent interfacial properties Rheological behavior cellulose paper coating Coated paper

interfacial and electrical properties of HfAIO/GaSb metal-oxide-semiconductor capacitors with sulfur passivation

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Chinese Physics B 2014年第1期23卷 427-431页

作者：谭桢赵连锋王敬许军 Tsinghua National Laboratory fobr lnformation Science and Technology Institute of Microelectronics Tsinghua University Beifing 100084 China

关键词： HfAlO GaSb metal-oxide-semiconductor capacitors interfacial properties