Design of anhydrous electrorheological suspensions based on phosphate cellulose

The electrorheological (ER) behavior of suspensions in silicons oil of phos phate cellulose particles (average particle size : 17.77 mu m) was investig ated at room temperature with electric fields up to 2.5 kV mm(-1). For deve lopment of anhydrous ER suspensions for use at wide temperature range, it w as sought the effect of the phosphate-ester reaction of celluloses on ER ac tivity. Current density and conductivity of anhydrous ER suspensions of pho sphate cellulose particles could be controlled by varying phosphoric acid c oncentration in phosphate-ester reactions of cellulose. When cellulose part icles were treated by the phosphoric acid between 2.5 M and 3.0 M, ER suspe nsions containing phosphate cellulose particle electrorheological effect (t au(A)/tau(0)) was greatest.