Effect of pH on rheology of aqueous Al_(2)O_(3)/SiC colloidal system

摘要

The rheological behavior of aqueous Al_(2)O_(3)/SiC suspensions at different pH values was investigated by rheological measurement.Experimental results showed that at pH=3-6,Al_(2)O_(3) and SiC particles have opposite surface charges,and the binary suspensions have lower viscosity than the unary suspensions at shear rates of 0-300 s^(-1).Furthermore,at pH=3-12,the stability of the Al_(2)O_(3) component seemed to dominate the overall rheological behavior of the Al_(2)O_(3)/SiC binary suspensions.The tendency mentioned above showed little variations in various ionic strengths,particle diameters and component fractions.