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Dispersion of Nanomaterials in Aqueous Media: Towards Protocol Optimization
Published on: December 25, 2017
Formation of metallic silver and copper in non-aqueous media by ultrasonic radiation
Martina Pilloni1, Vijay Bhooshan Kumar2, Guido Ennas1
1Dipartimento di Scienze Chimiche e Geologiche, Università di Cagliari, Cittadella Universitaria Monserrato, 09042 Monserrato (CA), Italy.
Abstract:
Concentrated suspensions of silver and copper salts in silicone oil were heated to 200 °C and irradiated with ultrasonic energy for different time durations. Characterization of the products was done using X-ray powder diffraction. In most cases, metallic Ag or Cu were obtained, together with their oxide forms Ag2O and Cu2O. The salts, used as precursors, do not dissolve in silicone oil but rather form a heterogeneous system, and we assume that local heating, caused by the acoustic cavitation, enhanced their thermal decomposition and the formation of metallic particles. It was found that the presence of silver particles enhances the formation of metallic copper. This phenomenon was observed in the experiment with the acetate salts mixture.
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