Effects of Ethanol on the Stability of Pigment Colloidal Dispersion

Abstract

The effects of ethanol on the thickness and ionization of adsorbed polymer layer on pigment were investigated. The results showed that the thickness of adsorbed polymer layer decreased with the increase of the ethanol concentration, and then the pigment particles aggregated when the concentration of ethanol is higher than 40%. The zeta potentials became more negative with the increasing of the ethanol concentration, and then changed reversely when the ethanol concentration was higher than 16%. The thickness and structure of adsorbed polymer layer on the particle determined the stability of pigment dispersion.

Keywords:

• Adsorbed polymer layer
• stability of dispersion
• zeta potential

This work is supported by National Natural Science Foundation of China (20474025, 50173012). We also thank the Jiangnan University for supporting the course of research.

Notes

The flocculation was observed when the concentration of ethanol is 60% or 80%.