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Actuation performances of catkin fibers reinforced thiol-acrylate main-chain liquid crystalline elastomer

International Journal of Smart and Nano Materials 2022年第4期13卷 668-690页

作者： liru Yao Huixuan Yan Yifan He Nan Zhao Xiuxiu Wang chensha li liguo Sun Yang He Yanju liu Jianqi Zhang Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of China Heilongjiang University 150080HarbinP.R.China Institute of regulatory science Beijing Technology and Business University 100048BeijingP.R.China Key Laboratory of Chemical Engineering Process and Technology for High-Efficiency Conversion School of Chemistry and Material Science Heilongjiang University 150080HarbinP.R.China Center for Composite Materials and Structures Harbin Institute of Technology(HIT)150080HarbinP.R.China Department of Astronautical Science and Mechanics Harbin Institute of Technology(HIT)150001HarbinP.R.China Key Laboratory of Nanosystem and Hierarchical Fabrication National Center for Nanoscience and Technology 100190BejingP.R.China

liquid crystalline elastomers(LCEs)have been utilized as an important class of smart actuator materials.However,the modest actuation mechanical and robustness performances remain a challenge.Inspired by the specific structures,well mechanical properties and physico-chemical characteristics of some natural plant fibers,a composite of thiol-acrylate main-chain LCE matrix incorporated with catkin fibers is designed and developed.The catkin fibers build a network as reinforcement phase,and demon-strate effective compatibility and integration property with the matrix,their high flexibility can be adapted to the large deforma-tional performance of LCE matrix.The prepared LCE composite demonstrates strong mechanical actuation properties.The mod-ulus and driving force triggered by the stimuli are obviously increased.The tensile strength and fatigue failure resistant prop-erty under high loadings and repeated cycles of thermal actua-tion or photothermal actuation are greatly enhanced.While the stimulus response deformation rate,phase transition temperature and liquid crystal phase structure of the LCE matrix,and so on,do not weaken or change.This work promotes the LCE materi-als’application potential and broadens the application value of natural plant fibers.

关键词： liquid crystalline elastomer catkin fibers reinforcement materials smart composites mechanical actuation

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Recyclable adsorbent of BiFeO_3/Carbon for purifying industrial dye wastewater via photocatalytic reproducible

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Green Energy & Environment 2019年第1期4卷 66-74页

作者： Shuang Jiao Yiming Zhao chensha li Binsong Wang Yang Qu Key Laboratory of Functional Inorganic Materials Chemistry (Heilongjiang University) Ministry of Education School of Chemistry and Materials ScienceInternational Joint Research Center for Catalytic Technology Key Laboratory of Functional Inorganic Materials Chemistry(Heilongjiang University) Ministry of Education School of Chemistry and Materials ScienceInternational Joint Research Center for Catalytic Technology

It is essential to prepare highly-efficiency reproducible adsorbent for purifying industrial dye wastewater. In this work, biscuit with a layered porous structure as a template is applied to prepare a photocatalytic recyclable adsorbent of BiFeO3/Carbon nanocomposites for purifying simulative industrial dye wastewater. It is found that the structure of the prepared BiFeO3/Carbon nanocomposite is related to the natural structure of the biscuit, annealing temperatures and immersing times, demonstrated by XRD, TEM, UV-Vis and adsorptive activities. Kinetics data shows that the adsorption rate of the adsorbent to the dye is rapid and fitted well with the pseudo-second-order model, that more than 80% of dyes can be removed in the beginning 30 min. The adsorption isotherm can be perfectly described by the Langmuir model as well. It can be seen from the adsorption data that the adsorption performance can reach over 90% at pH ? 2–12, which can imply its universal utilization. The prepared BiFeO_3/Carbon nanocomposites have also displayed excellent capacities(over 90% within 30 min) for adsorption of seven different dyes and their mixed one. According to the five times photocatalytic reproducible experiments, it is proved that BiFeO_3/Carbon nanocomposites show the excellent stability and reproduction for purifying simulative industrial dyes, even the sample have been placed for one year. These research results indicate that the adsorbent BiFeO_3/Carbon can be a suitable material used in treating industrial dye wastewater potentially.

关键词： Reproducible adsorbent BiFeO3/Carbon nanocomposites Photocatalysis Purifying industrial dye wastewater Pseudo-second-order model

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Effect of Co-polyester antistatic agent modified by carbon nanotubes on the properties of polypropylene fibers

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Journal of University of Science and Technology Beijing 2007年第6期14卷 573-579页

作者： chensha li Binsong Wang Weizhe Lu Dazhi Wang Zhi li Zechao Di Ji liang Department of Mechanical Engineering Tsinghua University Beijing 100084 China School of Chemistry and Materials Science Heilongjiang University Harbin 150080 China

Antistatic polymer fibers were investigated by using carbon nanotubes （CNTs） to enhance the antistatic ability of inner antistatic agents based on the mechanism of attracting moisture by polar radical groups. It is indicated that the antistatic ability of the fibers filled with composite antistatic agents that contain CNTs and organic antistatic agents was superior to that of the fibers filled either with pure organic antistatic agents or pure CNTs. The antistatic ability of the composite antistatic agent fabricated by an in situ process was superior to that of the composite antistatic agent fabricated by direct dispersing CNTs in the antistatic agent carrier. Moreover, the heat-treated CNTs could further enhance the antistatic effect compared with the initial CNTs. The antistatic effect is significantly influenced by the content of CNTs in the composite antistatic agent.

关键词： carbon nanotube polypropylene fiber antistatic agent in situ process

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Fabrication of N-CQDs@W_(18)O_(49) heterojunction with enhanced charge separation and photocatalytic performance under full-spectrum ligh irradiation

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Chinese Chemical Letters 2021年第10期32卷 3180-3184页

作者： Ju Huang Jiawen Wang Zhengjia Hao chensha li Binsong Wang Yang Qu Department of Environmental Science School of Chemistry and Materials ScienceKey Laboratory of Functional Inorganic Material ChemistryMinistry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080China

Increasing the charge separation and the utilization efficiency of sunlight are essential factors in a photocatalytic process.In this study,we prepared crystalline N-CQDs@W_(18) O_(49) heterostructures,through the in situ growth of W_(18) O_(49) nanocrystals on nitrogen-doped carbon quantum dots(N-CQDs).N-CQDs@W_(18) O_(49) nanocomposites showed high activity in the photodegradation of ciprofloxacin(CIP)and methyl orange(MO).The photodegradation activity of the optimized N-CQDs@W_(18) O_(49)-5 sample was four times higher than that of W_(18) O_(49) under ultraviolet-visible(UV–vis) light irradiation.The photodegradation activity of N-CQDs@W_(18) O_(49)-5 sample was two times higher than that of W_(18) O_(49) under near-infrared(NIR) light irradiation.The enhanced photosensitivity of the nanocomposites was attributed to the promotion of charge separation by N-CQDs and the local surface plasmon resonance(LSPR) effect of W_(18) O_(49) under NIR light irradiation.This work provides a promising approach for designing and manufacturing photocatalysts with full-spectral responsiveness and improved charge separation.

关键词： Photocatalysis Full-spectrum light Tungsten oxide Localized surface plasmon resonance Nitrogen-doped carbon quantum dots

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Preparation of ZrO_2 nano-particles by the hydrolysis of ZrOCl_2 solution in the reverse micelles

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Journal of University of Science and Technology Beijing 2006年第4期13卷 355-358页

作者： chensha li Tongxiang liang Tianyong Luo New Material Division Institute of Nuclear Energy Technology Tsinghua University Beijing 102201 China

Zirconia nano-particles have been produced by the hydrolysis of ZrOCl2 solution in the reverse micelles of a liquid-liquid two-phase system, in which sodium bis（2-ethylhexyl） sulfosuccinite （AOT） and toluene were chosen as the surfactant and organic phase, respectively. The reverse micelles prevented the aggregation of primary particles and reduced the diameters of zirconia nanoparticles. Superfine zirconia powders soft-aggregated by the zirconia nano-particles were obtained. The diameters of zirconia nanoparticles were influenced by the quantity of the surfactant.

关键词： zirconia nanoparticles hydrolysis surfactant

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The impact of solvent and modifier on ZnO thin-film transistors fabricated by sol-gel process

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Science China(Technological Sciences) 2014年第11期57卷 2153-2160页

作者： DONG YinMao TANG DongYan li chensha School of Sciences/Beijing Key Lab of Plant Resource Research and Development Beijing Technology and Business University School of Chemical Engineering and Technology Harbin Institute of Technology Department of Mechanical Engineering Tsinghua University

Techniques for fabricating solution-processed zinc oxide(ZnO)-based thin-film transistors(TFTs)are feasible with solution using various routes.Here,ZnO TFTs were fabricated via sol-gel method using zinc acetate as the starting reagent with different modifiers and solvents.The ZnO thin-film semiconductors with well-controlled,preferential crystal orientation and densely packed ZnO crystals can be prepared with the optimized fabrication conditions,exhibiting excellent field-effect far exceeding those of hydrogenated amorphous silicon(a-Si:H).However,the field-effect characteristics of ZnO TFTs were different for different precursor systems which were constituted by zinc acetate,modifiers and solvents.The co-modification of acetoin and monoethanolamine for the precursor system exhibited higher extent of crystal orientation and field-effect.The maximum mobility of 7.65 cm2V-1s-1 and current on-to-off ratio of^105–106 have been obtained.

关键词：薄膜晶体管溶剂组成凝胶过程氧化锌改性剂溶胶制备 ZnO晶体

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Effect of particle size on phase structure of ZrO_2 produced by hydrolysis of ZrOCl_2 solution

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Journal of University of Science and Technology Beijing 2005年第4期12卷 365-369页

作者： Tianyong Luo Tongxiang liang chensha li Institute of Nuclear Energy Technology Tsinghua University Beijing 100084 China

A method to produce ZrO2 nano-particles is developed and the effect of particle size on the phase structure of ZrO2 is studied. The method is based on the hydrolysis of ZrOCl2 solution in the reverse micelles of a liquid-liquid two-phase system, in which AOT （sodium 2-ethylhexyl sulfosuccinite） and toluene are chosen as the surfactant and organic phase, respectively. The reverse micelles prevent the aggregation of primary particles, the nano-particle size increases as the AOT content decreases. The TEM, XRD and particle-size analysis results show that the occurrence of metastable tetragonal ZrO2 is attributed to the effect of the particle size other than the effect of the crystallite size. The ratio of t-phase to m-phase increases as the particle size decreases, and 28 nm is the critical size for t-phase to m-phase transformation.

关键词： zirconia nano-particles hydrolysis phase transformation

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Decorating multiwalled carbon nanotubes with zinc oxide nano-crystallines through hydrothermal growth process

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Science China(Technological Sciences) 2012年第5期55卷 1365-1370页

作者： li chensha QIAO YingJie li YuMing Department of Chemical Engineering McMaster UniversityHamiltonl Ontario L8S 4L7Canada Department of Materials Science Harbin Engineering UniversityHarbin 150001China Materials Design&Integration Laboratory Xerox Research Centre of CanadaOntario L5K 2L1Canada

Multiwalled-carbon nanotubes coated with nano-crystalline zinc oxide (ZnO) was prepared by in situ growth of nano zinc oxide on the surfaces of carbon nanotubes through hydrothermal method. X-ray diffraction, transmission electron microscopy and scanning electron microscopy analysis techniques were used to characterize the samples. It was observed that a layer of nano-crystalline ZnO with the wurtzite hexagonal crystal structure was uniformly coated on the nanotube surfaces with good adhesion, which resulted in the formation of a novel ZnO-nanotube nano composite. In this work, the carbon nanotubes decorated by metal oxide nanoparticles were synthesized by a simple chemical-solution route which is suitable for the large-scale production with low cost.

关键词：多壁碳纳米管纳米氧化锌水热法生长过程装饰扫描电子显微镜分析纳米晶ZnO 透射电子显微镜

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Decorating multiwalled carbon nanotubes with zinc oxide nanoparticles by thermally decomposing Zn-oleate in an organic medium

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Science China(Technological Sciences) 2009年第5期52卷 1254-1257页

作者： li chensha QIAO YingJie li YuNing WU Yiliang Department of Chemical Engineering McMaster UniversityOntario L8S 4L7Canada Department of Materials Science Harbin Engineering UniversityHarbin 150001China Materials Design&Integration Laboratory Xerox Research Centre of CanadaOntario L5K 2L1Canada

Carbon nanotubes decorated with zinc oxide nanoparticles were produced by thermally decomposing a Zn-oleate complex in an octadecene medium.The structure of the ZnO decorating nanotube surfaces was characterized by transmission electron microscopy,scanning electron microscopy and X-ray dif-fraction.The surfaces were shown to be densely and homogeneously covered by ZnO nanoparticles with a size below 10 nm.The nanoparticles had the wurtzite hexagonal crystal structure and showed good adhesion to the nanotubes.The carbon nanotubes decorated by metal oxide nanoparticles were synthesized at relatively low temperature and non-oxidation environment.Moreover,the large-scale production with low cost can be realized.

关键词： carbon nanotubes transmission electron micrograph zinc oxide decomposition

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Effect of electrochemical oxidation on carbon nanotube electrodes of electric double layer capacitors

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Science China(Technological Sciences) 2012年第4期55卷 913-920页

作者： QIAO YingJie li chensha CHEN XingJuan JIAO CaiShan Department of Materials Science Harbin Engineering UniversityHarbin 150001China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Chemistry Engineering Department Harbin Engineering UniversityHarbin 150001China

Electrochemical oxidation of the carbon nanotube (CNT) polarizable electrodes of electric double layer capacitors (EDLCs) was studied. It indicated that electrochemical oxidation elevated the available surface area of the electrodes and introduced some kinds of functional group on the CNT surfaces. The specific capacitances of the polarizable electrodes with organic electrolyte could be enhanced from 22.4 F g-1 to 78.2 F g-1 after electrolysis oxidization. The enhancement of the specific capacitance depends on the extent of electrochemical oxidation. Using acidic electrolyte for electrochemical oxidation has different effects on modifying the performances of the CNT polarizable electrodes compared to using basic electrolyte.

关键词：碳纳米管电极双电层电容器电化学氧化有机电解液极化电极表面官能团酸性电解液电解氧化

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