Design of anhydrous electrorheological suspensions based on phosphate cellulose

Abstract

The electrorheological (ER) behavior of suspensions in silicons oil of phosphate cellulose particles (average particle size : 17.77 mu m) was investigated at room temperature with electric fields up to 2.5 kV mm(-1). For development of anhydrous ER suspensions for use at wide temperature range, it was sought the effect of the phosphate-ester reaction of celluloses on ER activity. Current density and conductivity of anhydrous ER suspensions of phosphate cellulose particles could be controlled by varying phosphoric acid concentration in phosphate-ester reactions of cellulose. When cellulose particles were treated by the phosphoric acid between 2.5 M and 3.0 M, ER suspensions containing phosphate cellulose particle electrorheological effect (tau(A)/tau(0)) was greatest.