Reduction of HAuCl4 has been investigated pulse radiolytically in water and in water-in-oil microemulsions. Rate constants have been determined for[formula omitted] (where[formula omitted] is an unidentified radical). On the longer time scale formation of colloidal gold,[formula omitted], has been observed. Rate of colloidal gold formation has also been studied in the bombardment of HAuCl4 solutions by 353-nm 60-mJ 3-5-ns laser pulses. Hydrodynamic diameters and polydispersities of empty and colloidal-gold-containing microemulsions have been determined by dynamic laser light scattering to be 150 and 220 Å, respectively. Morphologies of colloidal gold have been determined by electron micrography. There are a number of advantages of forming colloidal particles in microemulsions. Under identical conditions a greater amount of colloidal particles is formed than that in water. Colloidal gold particles formed in microemulsions are smaller and more uniform than those obtained in homogeneous solutions.
ASJC Scopus subject areas
- Colloid and Surface Chemistry