Abstract
Gold particles were prepared by the reduction of extracted chlorauric acid with hydrazine/ formaldehyde/benzaldehyde. The extractants used were as follows: distearyldimethylammonium chloride (DDAC), trioctylmethylammonium chloride (TMAC) and trioctylphosphine oxide (TOPO). The extraction ratio of Au(III) increased in chloroform and cyclohexane with an increase in the concentration of extractants. The particle size of gold obtained by reduction of the extracts decreased with an increase in extraction ratio. In the TOPO-cyclohexane-hydrazine system in particular, very stable gold particles with an average diameter of 6.8 nm were obtained in the presence of excess of TOPO.
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