Composite Dispersion of Nanosized AlOOH in Liquid Phase

Abstract

TEM, SEM and laser particle size analysis were used to study hydrothermal crystallization and a charging composite dispersion of nanosized AlOOH, using a self-dispersed nanosized AlOOH crystal powder prepared by sol-hydrothermal method. The results show that the composite method can improve particle dispersion and stability in liquid. The improvement in the dispersion effect is attained by weakening the van der Waals force, reducing the particle surface energy through hydrothermal crystallization, and increasing the charge by partly dissolving the anions or cations at the crystal lattice surface. Based on these results, a mechanism for hydrothermal crystallization and a charging composite dispersion of nanosized AlOOH is proposed. The preparation of nanometer TiO₂ and nanometer Al₂O₃ have been preliminarily studied using the composite dispersion method.