Continuous synthesis of colloidal silver nanoparticles by electrochemical discharge in aqueous solutions |
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Authors: | Kuo-Hsiung Tseng Yu-Chun Chen Jing-Jong Shyue |
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Institution: | (1) Department of Electrical Engineering, National Taipei University of Technology, Taipei, Taiwan;(2) Research Center for Applied Sciences, Academia Sinica, Taipei, Taiwan;(3) Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan; |
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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. |
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