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Synthesis and Electrorheological Properties of LTNO-PS Composites
Jia-xiang Hou,Lei Shi*,Shi-ming Zhou,Qing-ren Zhu
Author NameAffiliationE-mail
Jia-xiang Hou Hefei National Laboratory for Physical Science at Microscale and Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China  
Lei Shi* Hefei National Laboratory for Physical Science at Microscale and Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China shil@ustc.edu.cn 
Shi-ming Zhou Hefei National Laboratory for Physical Science at Microscale and Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China  
Qing-ren Zhu Hefei National Laboratory for Physical Science at Microscale and Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China  
Abstract:
Core-shell structural Li and Ti co-doped NiO/polystyrene samples (LTNO/PS) were synthesized by a sol-gel method and studied by TEM, X-ray diffraction, IR spectroscopy and LCR meter. It was found that the core-shell LTNO/PS particles are nearly smooth spheres with an average size of around 4.0 mm, while the LTNO particles alone have a size of around 3.5 mm. The electrorheological activity of LTNO particles with PS coating is larger than that of the bare ones with the same components. This research reveals that the high dielectric constant and corresponding dielectric loss of the LTNO is related to the Li and Ti contents. The increase of electrorheological activity of LTNO particles with PS coating is caused by the increase of dielectric permittivity, the surface structural change, and the reduction of leakage current of PS-coated samples due to the high resistivity and soft contacting of PS shell. By the preparation of core/shell structural materials and taking the advantage of the shell to reduce the leakage current between the particles, the electrorheological effect can be effectively increased.
Key words:  Electrorheological effect, Core/shell structure, LTNO-PS
FundProject:
LTNO表面包覆聚苯乙烯材料的制备和电流变性能
侯家祥,石磊*,周仕明,朱清仁
摘要:
采用溶胶凝胶和表面接枝的方法, 合成了一种新型核壳结构的电流变液材料, 其组成为Li0:1(TixNi1-x)0:9O/聚苯乙烯(x=0.02,0.05).通过透射电镜、X射线衍射和红外光谱分析方法研究了该材料的形貌和结构, 并利用宽频阻抗测量仪、静态电流变测量仪研究了该材料的介电性质和电流变性能, 进而讨论了其结构与电流变性能之间的关系.研究发现,随着Ti含量增加,Li0:1(TixNi1-x)0:9O的介电常数减小,电流变效应减弱,且聚苯乙烯包裹后,介电常数进一步下降,但电流变效应有明显增强.结果表明,利用核、壳两部分各自具有的不同电学和力学性质组合制备得到的核壳结构电流变材料,可具有很高的介电常数,合适的介电损耗以及较小的漏电流密度,其电流变性能可得到明显的提高.
关键词:  电流变效应,核壳结构,LTNO-PS
DOI:10.1088/1674-0068/20/03/319-323
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