Preparation of Gold Nanoparticles in Inorganic Suspension and Clay Gel Solution.

Abstract

Gold nanoparticles are prepared in titania, silica and clay suspensions by chemical reduction of tetrachroloauric ions using 1,3-aceton dicarboxylic acid. The formation rates of gold nanoparticles in titania and silica suspensions were almost the same as that in an aqueous solution. Slower formation rates were obtained in a clay gel solution, becoming slower with increasing clay concentration. Although the gold nanoparticles became large and polydispersed, due to the slow diffusion rate of tetrachroloauric ions in the clay gel, the good dispersion state of gold nanoparticles was retained even after the clay gel had dried.