Surface intraction and non-aqueous alumina suspension behavior control by using polymer dispersant with different molecular structure

Abstract

To analyze the action mechanism of polyethyleneimine, PEI in dense alumina/ethanol suspension, the macroscopic suspension viscosity with different structure of PEI was measured and compared with the surface intraction between alumina spherical particle and flat substrate in ethanol with different structure of PEI characterized by using colloid probe atomic force microscopy (AFM). With increasing molecular weight of PEI up to 70000, the suspension viscosity decreased and short-range repulsive force between solid surface increased.