Journal of Inorganic Materials

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Characterization and Electrorheological Effect of H2SO4-modified TiO2 Particles

GAO Lan, MA Hui-Ru, LIU Yang-Sheng, GUAN Jian-Guo   

  1. (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China)

  • Received:2009-03-02 Revised:2009-04-27 Published:2009-11-20 Online:2010-04-22

Abstract:

H2SO4-modified TiO2 particles were prepared using a sol-gel method followed by impregnating the dry gels with sulphuric acid and were used to fabricate an electrorheological (ER) fluid with high ER activity. The as-synthesized H2SO4-modified TiO2 particles were characterized by fourier transform infrared (FT-IR), X-ray diffraction (XRD), BET N2 adsorption-desorption isotherm analysis, and the ER effect and dielectric spectra of the ER fluids were measured. The results show that H2SO4-modified TiO2 particles have smaller size of crystal grains and higher specific surface area due to the restraint of SO42- from the grain growth. Under the same measured condition and electric field strength of 3kV/mm, the ratio of fieldinduced shear stress to zero field shear stress (τE/τ0) of TiO2 particles is 80, while that of H2SO4-modified TiO2 particles is more than 500. The observed ER performances are reasonably explained by the stronger interfacial polarization, which is brought by the specific structures of the H2SO4-modified TiO2 particles.

Key words: titania, sulfuric acid, interfacial polarization, electrorheological effect

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