L. M. Zemtsov
Russian Academy of Sciences
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Featured researches published by L. M. Zemtsov.
Polymer Science Series A | 2006
L. M. Zemtsov; G. P. Karpacheva; M. N. Efimov; D. G. Muratov; K. A. Bagdasarova
For the first time, it is shown that IR pyrolysis of a composite based on polyacrylonitrile and gadolinium chloride produces a metal-carbon nanocomposite where metal particles with a size of 4–11 nm form a fine dispersion in the structure of the carbon matrix. The carbon phase of the composite is a carbon-carbon nanocomposite with a structure in which carbon nanoparticles (bamboolike carbon nanotubes, carbon nanospheres, or octahedral carbon nanoparticles) are incorporated into the matrix graphite-like material.
Russian Journal of Physical Chemistry A | 2008
M. N. Efimov; E. L. Dzidziguri; E. N. Sidorova; K. O. Chuprunov; L. M. Zemtsov; G. P. Karpacheva
Nanosized Pt-Ru alloy and Pt13Ru27 intermetallic compound particles dispersed in a carbon matrix were obtained for the first time directly during the preparation of the composite. The alloying of the Pt and Ru particles occurred at IR pyrolysis intensities corresponding to temperatures above 700°C over the whole homogeneity range of solid solutions based on platinum. Metallic nanoparticles were round-shaped (the mean size 6–8 nm) and had a narrow particle-size distribution.
Polymer Science Series A | 2009
G. P. Karpacheva; K. A. Bagdasarova; G. N. Bondarenko; L. M. Zemtsov; D. G. Muratov; N. S. Perov
The influence of the ligand on the formation of a system of conjugated-bonds at the initial steps of IR-pyrolysis of composites based on polyacrylonitrile and Co(C5H7O2)2 or CoCl2 is demonstrated. An increase in IR-irradiation intensity leads to the formation of nanocomposites that contain nanoparticles of cobalt dispersed in a graphite-like matrix. Superparamagnetic Co particles are shown to make a significant contribution to the magnetic behavior of the nanocomposites prepared. The dependence of the electric properties of the composites on the synthesis conditions is investigated, and the role of Co nanoparticles in the growth of electrical conductivity is shown.
Nanotechnologies in Russia | 2012
E. L. Dzidziguri; D. G. Muratov; L. M. Zemtsov; G. P. Karpacheva; E. N. Sidorova
Metal-carbon nanocomposites comprising carbon matrices of a graphite-like structure with dispersed CuZn2 and CuZn5 bimetal nanoparticles have been obtained for the first time under conditions of the IR pyrolysis of the precursor based on polyacrylonitrile and copper and zinc acetates (Zn : Cu ratio = 1 : 5). It has been demonstrated that the CuZn5 phase formation starts at 300°C, whereas the CuZn2 phase formation starts at T > 500°C. The CuZn2 and CuZn5 bimetal nanoparticles coexist in the structure of nanocom-posites obtained at T ≥ 700°C. Here the CuZn2 bimetal nanoparticle fraction increases with an increase in the intensity of the IR pyrolysis.
Crystallography Reports | 2012
M. N. Efimov; A. A. Nekrasova; E. L. Dzidziguri; E. N. Sidorova; L. M. Zemtsov; G. P. Karpacheva
The structure of nanocomposites of the C-Pd system has been studied by X-ray diffraction analysis and transmission electron microscopy. Variations in the lattice period of nanosized palladium, the average amount of hydrogen dissolved in it, and the size distribution of palladium nanoparticles have been analyzed as functions of the nanocomposite fabrication temperature. Based on the structural data, the solubility of hydrogen in nanosized palladium has been estimated.
Russian Journal of Physical Chemistry A | 2011
M. N. Efimov; E. L. Dzidziguri; E. N. Sidorova; L. M. Zemtsov; G. P. Karpacheva
Metal-carbon nanocomposites consisting of a carbon matrix with dispersed nanosize bimetallic Pd-Fe particles were obtained. It was established that at 500–700°C, the bimetallic particles form a solid solution of iron in palladium. It was concluded that raising the intensity of infrared pyrolysis to 800–1100°C leads to the formation of intermetallic compounds whose composition depends on the temperature of nano-composite fabrication.
Polymer Science Series A | 2010
G. P. Karpacheva; Arkady D. Litmanovich; G. N. Bondarenko; L. M. Zemtsov; L. B. Krentsel
The accelerated aging of butadiene-nitrile rubber (NBR) induced by IR radiation is studied. At 100°C, intensive aging (the formation of imide and anhydride crosslinks) of NBR is observed in air and argon. The activity of aging under IR radiation is significantly higher than the heat aging. The IR radiation selectively activates nitrile groups without any chemical transformation in butadiene units of the rubber. On the basis of the data obtained, it is suggested that the use of IR radiation makes it possible to model processes occurring as a result of local temperature fluctuations during prolonged natural aging of NBR. Thus, the accelerated aging induced by IR irradiation at 100°C can be recommended as an effective method for estimating structural instability of NBR during storage.
Polymer Science Series A | 2009
G. N. Bondarenko; M. N. Efimov; L. M. Zemtsov; G. P. Karpacheva
Complexation in the polyacrylontrile-amide solvent-PtCl4 solvent system has been studied by IR and electronic absorption spectroscopy. It has been shown that Pt is involved in complexation between the amide group of the solvent and the nitrile group of the polymer, thereby promoting retention of the residual solvent in it. Upon full removal of the solvent, Pt forms complexes with the conjugated system of C=N bonds being formed.
Physics of the Solid State | 2008
K. A. Bagdasarova; L. M. Zemtsov; G. P. Karpacheva; N. S. Perov; A. V. Maksimochkina; É. L. Dzidziguri; E. N. Sidorova
Metal-carbon nanocomposites, namely, IR-pyrolized poly(acrylonitrile)/Fe (IR-PAN/Fe) were produced and studied. The structure and magnetic properties of the composites were studied for various synthesis conditions. Nanosized carbon objects (nanospheres) and iron carbide nanoparticles were revealed in the composite structure. The magnetic properties of the nanocomposites prepared at various IR-annealing temperatures were studied.
Crystallography Reports | 2008
E. L. Dzidziguri; E. N. Sidorova; K. A. Bagdasarova; L. M. Zemtsov; G. P. Karpacheva
The effect of the IR-pyrolysis intensity on the phase formation and structure of Co nanoparticles in a matrix of IR-pyrolyzed polyacrylonitrile has been investigated.