Colloidal gold prepared by interphase reduction and its characterization

Stable colloidal solution of gold in hexane was obtained by interphase redu ction of gold complex with quaternary ammonium salt with sodium borohydride dissolved in hexane and water, respectively, without any addition of a sta biliser. The disperse phase of the colloidal solution consists of crystal s pherical particles of gold of average diameter ca. 2.6 nm (sigma = 0.47). S imultaneously with formation of hexane colloidal dispersion, the gold film was deposited at the walls of the reaction vessel in aqueous phase. This fi lm is composed of spherical gold particles of average diameter 8.2 nm (sigm a = 0.57).