Abstract
Stable sols of ruthenium, rhodium, palladium, platinum, silver, and gold were prepared from aqueous solutions of the corresponding noble metal salts by reduction with sodium borohydride in the presence of three different types of surfactants, stearyltrimethylammonium chloride (SC), sodium dodecylbenzenesulfonate (SD), and polyethylene glycol mono- p-nonylphenyl ether (PN). The size of colloidal particles in these sols differs from one another according to the type of surfactant. The cationic surfactant, SC, gave positively charged sols, while either the anionic one, SD, or neutral one, PN, gave negatively charged sols. Surfactants also had considerable effects on the stabilities of sols toward electrolytes.
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