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Issue 9, 1997
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Ultrasound-induced formation and dissolution of colloidal CdS


The sonochemical formation of Q-state CdS colloids and the dissolution of larger colloidal CdS particles are described. In systems containing mercaptopropionic acid, the action of ultrasound produces H 2 S and in the presence of Cd 2+ (aq) ions, colloidal CdS is formed. The mechanism for the production of H 2 S appears to be predominantly H-atom attack on the thiol group of the mercaptan, although there is evidence that the local heating from ultrasound also contributes to H 2 S formation. The colloid particles produced by the ultrasound process clearly show quantum size effects and are estimated to be less than 3 nm in diameter. The dissolution of colloidal CdS at pH 10.5 appears to be due to the reaction of H 2 O 2 and O 2 with the colloids. It has been found that the reaction can be inhibited by the addition of Na 2 S to the colloidal solution. Results also show that the reactions involved in the presence of Na 2 S are complex and that sulfur oxyanions most likely partake in the overall scheme once they are formed.

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Article information

J. Chem. Soc., Faraday Trans., 1997,93, 1791-1795
Article type

Ultrasound-induced formation and dissolution of colloidal CdS

J. Z. Sostaric, R. A. Caruso-Hobson, P. Mulvaney and F. Grieser, J. Chem. Soc., Faraday Trans., 1997, 93, 1791
DOI: 10.1039/A608567I

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