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] Key Laboratory for Ultrafine Materials, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China; [2] Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, TGM 275, Zlin 762 72, 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：EI(收录号：20112414061126)

语种：英文

外文关键词：Dielectric properties - Mammals - Shellfish - Electrorheological fluids - Nanofluidics - Rheology - Architecture - Electric fields - Viscoelasticity - Microspheres - Yield stress

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. ? 2011 Springer-Verlag.