Continuous synthesis of colloidal silver nanoparticles by electrochemical discharge in aqueous solutions
Resource
Journal of Nanoparticle Research, 13(5), 1865-1872
Journal
Journal of Nanoparticle Research
Pages
1865-1872
Date Issued
2011
Date
2011
Author(s)
Tseng, Kuo-Hsiung
Chen, Yu-Chun
Shyue, Jing-Jong
Abstract
This article presents an electrochemical discharge (ECD) method that consists of a combination of chemical methods and electric arc discharges. In the method, 140 V is applied to an Ag electrode from a DC power supply. The arc-discharge between the electrodes produces metallic silver nanoparticles and silver ions in the aqueous solution. Compared with the original arc discharge, this ECD method creates smaller nanoparticles, prevents clumping of the nanoparticles, and shortens the production time. The citrate ions also reduce the silver ions to silver nanoparticles. In addition, the citrate ions cap the surface of the produced silver nanoparticles and the zeta potential increases. In this article, the weight loss of the electrodes and the reduction of silver ions to silver nanoparticles as a function of citrate concentration and electric conductivity of the medium are discussed. Furthermore, the properties of the colloidal silver prepared with ECD are analyzed by UV-Vis spectroscopy, dynamic light scattering, electrophoresis light scattering, and scanning electron microscopy. Finally, a continuous production apparatus is presented for the continuous production of colloidal silver. © Springer Science+Business Media B.V. 2010.
SDGs
Type
journal article
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