The formation of colloidal gold particles of diameter less than 10 nm has been achieved by the irradiation of aqueous HAuCl4 solutions with 20 kHz ultrasound; the particle size and efficiency of particle formation is highly dependent on the presence of alcohol, its type and concentration, in the solutions.
S. A. Yeung, R. Hobson, S. Biggs and F. Grieser, J. Chem. Soc., Chem. Commun., 1993, 378 DOI: 10.1039/C39930000378
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