An enhanced polarization mechanism for the metal cations modified amorphous TiO2 based electrorheological materials
State Key Laboratory of Metal Matrix Composites, Shanghai Jiaotong University, 200030, Shanghai, PRC
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Accepted: 21 February 2005
Published online: 1 April 2005
In the present work, we developed a new kind of electrorheological (ER) materials, metal cations modified amorphous TiO2 gels. The static yield stress of Sn4+ modified amorphous TiO2 gel based ER fluid with a volume fraction Φ = 38% reaches 26.2 kPa at E = 3.5 kV/mm. The result shows that metal cations can significantly enhance the ER activity of amorphous TiO2 gels. We then proposed a novel ER effect mechanism (metal cations enhanced polarization mechanism) to clarify the experimental results. We believe that it is the metal cations that enhanced the polarization of the polar groups (-OH) which results in the corresponding enhancement of the interfacial polarization.
PACS: 77.22.-d Dielectric properties of solids and liquids – / 77.22.Ej Polarization and depolarization –
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2005