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N. N. Begletsova, E. I. Selifonova, A. M. Zakharevich, R. K. Chernova, V. P. Sevostyanov, E. G. Glukhovskoy
Study of colloid dispersions stability of
copper nanoparticles based on sodium dodecilsulphate
Abstract
Methods of copper nanoparticles synthesis
in a micellar solution of the surfactant sodium dodecyl sulfate anionic type by
optimizing the molar ratios of precursor : reductant
Cu (II) : N2H4 equal to 1:4; 1:8; 1:20;
1:40; 1:100; 1:150 at pH 11.1 and pH values of the reaction medium equal
to 10.9, 11.0, 11.2 and 11.9 at an optimum molar ratio of
Cu (II) : N2H4 of 1:150 was improved. The
effect of increasing the molar ratio of Cu (II) : N2H4
on the growth of the optical density of suspensions of copper nanoparticles was
established. Stability over time of solutions studied by spectrophotometric
analysis colloidal dispersions of copper nanoparticles obtained in a molar
ratio of Cu (II) : N2H4 equal to 1:150 and
equal pH values of 10.9, 11.0, 11.2 and 11.9. The process of aggregation of
copper particles accompanied by a hypsochrome shift of the absorption band of
surface plasmon resonance toward larger wavelengths has been studied by the
method of dynamic light scattering. Scanning electron microscopy showed that
copper particles obtained with a molar ratio of Cu (II) : N2H4
of 1:50 and pH values equal to 10.9, 11.0, 11.2 have a spherical shape with
dimensions in the range of 12–176 nm.
Key words: copper nanoparticles, chemical
reduction, stability, spectrophotometry, dynamic light scattering, scanning
electron microscopy.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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