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A. K. TROKHIMCHUK, A. V. LEGENCHUK, V. I. PODOL’SKAYA, E. Yu. VOYTENKO, V. S. OVECHKO, and A. V. SHCHUR
«The Formation of Noble Metal Nanoparticles in Porous Silicas and Biological Matrixes»
509–528 (2008)
PACS numbers: 73.20.Mf, 81.07.-b, 81.16.-c, 82.70.-y, 82.80.-d, 83.80.-k, 87.64.-t, 87.83.+a
So-called ‘cold’ and ‘hot’ methods of the colloidal-gold formation in porous
matrix of silica gels modified with propylallylthiourea and mercaptopropyl
groups, and also combined chemical-microbiological method of the formation
of colloidal silver within the cells of microorganisms are proposed. As revealed
by the spectrum analysis, at the formation by the ‘cold’ method, the
separate nanoparticles with the size less than 1 nm are formed in the silica
gel. The majority of reduced gold did not take part in phase formation. After
the treatment at 600?Ñ, the size of gold particles in the composite material is
3.99 nm. Nanoparticles with average size of 1.6–1.7 nm are formed within
the yeast cells, which have thick cellular wall. Larger particles of silver,
which have average size of 2.14–2.47 nm, are formed in the matrix of bacilli,
pseudomonades and colibacilli. The content of silver in biocomposite material
is 48–55 mg/g. The method for double-modal approximation of the plasmon
resonance for the suspension of metallic nanoparticles is proposed and experimentally
realized. The presented method has been used for an estimation
of sizes and concentration of nanoparticles in two-component suspension,
which consists of fine- and coarse-dispersed fractions.
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