文献类型：期刊文献

英文题名：Synthesis and electrorheological characteristics of sea urchin-like TiO₂ hollow spheres

作者：Cheng, Qilin[1,2];Pavlinek, Vladimir[2];He, Ying[1];Yan, Yanfang[1];Li, Chunzhong[1];Saha, Petr[2]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Tomas Bata Univ Zlin, Fac Technol, Ctr Polymer, Zlin 76272, Czech Republic

年份：2011

卷号：289

期号：7

起止页码：799

外文期刊名：COLLOID AND POLYMER SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000290538000007)】；

基金：This work was supported by the National Natural Science Foundation of China (20925621), the Special Projects for Nanotechnology of Shanghai (1052 nm02300, 0952 nm02000, and 0952 nm02100), the Shanghai Pujiang Program (09PJ1403200), the Program of Shanghai Subject Chief Scientist (08XD1401500), the Special Projects for Key Laboratories in Shanghai (10DZ2211100), and the Fundamental Research Funds for the Central Universities (WD1013014). The authors also wish to thank the financial support of the Ministry of Education, Youth, and Sports of the Czech Republic (MSM 7088352101) and Grant Agency of the Czech Republic (202/09/1626).

语种：英文

外文关键词：Hollow TiO2 spheres; Sea urchin-like; Electrorheological fluid; Dielectric properties; Viscoelastic properties

摘要：TiO2 hollow microspheres with sea urchin-like hierarchical architectures were synthesized by a simple hydrothermal method. The as-synthesized hollow microspheres with hierarchical architectures consisting of many rhombic building units exhibit high specific surface area. Electrorheological (ER) properties of hierarchical hollow TiO2-based suspension were investigated under steady and oscillatory shear. The hollow TiO2-based suspensions show much higher yield stress and elasticity than pure TiO2 suspension at the same electric field strength. This phenomenon was elucidated well in view of their dielectric spectra analysis. The sea urchin-like architectures result in stronger interfacial polarization of hollow TiO2 suspension upon an electric field, showing higher ER activity. Also, hollow interiors of TiO2 particles increase the long-term stability of suspensions and further merit the ER effect.