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Received September 1, 2013
Accepted February 25, 2014
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Dispersion mechanisms of Arabic gum in the preparation of ultrafine silver powder
School of Materials Science and Engineering, Central South University, Lushan South Road No. 932, Changsha 410-083, P. R. China
Korean Journal of Chemical Engineering, August 2014, 31(8), 1490-1495(6), 10.1007/s11814-014-0069-4
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Abstract
Finely divided silver micro-spheres were prepared with Arabic gum (AG) as dispersant through the chemical reaction of AgNO3 and ascorbic acid. AG dispersive mechanisms in the preparation of silver powder are proposed in the paper. The -COOH and -NH2 groups of AG reacted with Ag+ to form Ag+-AG complexes, followed by the nucleation of silver on AG polymer chains, which yielded silver spheres with an AG protection layer by reducing Ag+-AG complexes with ascorbic acid. With the steric effect of AG, the prepared silver particles exhibit improved dispersibility._x000D_
UV-Vis and FTIR spectra confirmed that silver particles were stabilized by AG.
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