Interaction between ultrafine ceria particles and amino acid

Abstract

Ultrafine ceria particles of equivalent diameter of 18 nm, were dispersed at 10 vol% solid in aqueous solutions with amino acid (glycine, glutamic acid or lysine) of 0.5-5.0mass% against the mass of ceria at pH 2.0. The added amino acid was adsorbed on ceria particles to enhance the zeta potential of ceria to more positive values. The increased electrostatic repulsion with addition of amino acid prevented the sedimentation of the positively charged ceria particles.