Diammonium phosphate modified titanium dioxide suspensions with improved ER efficiency

摘要

Electrorheological (ER) efficiency is an important parameter that should be considered for applications of electrorheologcial fluids. In this study, diammonium phosphate ((NH4)(2)HPO4, DAP) is used to modify titanium dioxide particles. The structures and morphologies of the DAP modified particles are not significantly changed compared with pure TiO2. The ER behaviors of the suspensions prepared with TiO2 particles and the DAP modified particles are tested. The results indicate that the DAP modified particle-based ER fluids have a much higher ER efficiency and higher shear stress than the TiO2 particle-based suspension. The highest ER efficiency obtained is 1.2 x 10(5)% at 5 kV mm(-1), which is two orders magnitude higher than the TiO2 particle-based suspension.