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Preparation and the mechanisma of formation of Silver particles of different morphologies in homogeneous solutions

Uniform, well-dispersed silver particles of various morphologies have been prepared by reducing highly acidic ailver nistrate solutions with ascorbic acid in the presence of a sodium naphthalene sulphonate-formaldehyde copolymer as dispersing agent. By varying the temperature of the reaction the free acid content, the addition rate of the reducant, and the aging time, both isometric and anisotropic silver particles could be obtained. It was found that the latter were formed by aggregation of nanosize subunits, which were identified by electron microscopy and X-ray diffractometry.

colloidal Silver; metal nanoparticles; nanoparticle structure; tabular Silver particles

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