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Kalenskii A.V.,Kemerovo State University | Anan'Eva M.V.,Kemerovo State University | Kriger V.G.,Kemerovo State University | Zvekov A.A.,RAS Institute of Coal Chemistry and Chemical Materials Science
Russian Journal of Physical Chemistry B | Year: 2014

The rate constant of capture of electron charge carriers on a screened repulsive center are performed. Approximate expressions for the potential barrier width, the capture cross section, and rate constant are derived. It is shown that the increase in the concentration of free charge carriers in silver azide from 1016 to 1020 cm-3 results in an increase in the capture rate constant by four orders of magnitude. It is also shown that, with increasing concentration of free carriers, the temperature dependence of the rate constant weakens and the effective activation energy of capture in silver azide decreases from 0.18 to 0.01 eV. © 2014 Pleiades Publishing, Ltd. Source


Kalenskii A.V.,Kemerovo State University | Anan'eva M.V.,Kemerovo State University | Zvekov A.A.,RAS Institute of Coal Chemistry and Chemical Materials Science | Zykov I.Y.,Kemerovo State University
Technical Physics | Year: 2015

The explosive decomposition kinetics of tetranitropentaerythrite aluminum compressed pellets is studied with a high time resolution. Explosive decomposition is initiated by a pulsed 1064-nm laser with a pulse FWHM of 12 ns. Emphasis is on the prethreshold glow mode, which sets in at a pulse energy density below 1 J/cm2. The ascending part of the glow intensity curve is described by a Gaussian function with effective constant k = (1.2 + 0.2) × 108 s−1. The characteristic decay time is about 40 ns. The total glow duration does not exceed 100 ns. Explosive decomposition becomes noticeable immediately during the pulse: the induction period is absent. The initial portion of the glow intensity curve is described by a Gaussian function with effective constant k = (1.4 + 0.1) × 108 s−1. The explosive glow kinetics is biextremal. The first peak is nearly coincident with the maximum of the laser action, and the extension of the second peak is 600 ns. Experimental data are treated in terms of the prethreshold model of thermal explosion. © 2015, Pleiades Publishing, Ltd. Source


Kriger V.G.,Kemerovo State University | Kalenskii A.V.,Kemerovo State University | Zvekov A.A.,RAS Institute of Coal Chemistry and Chemical Materials Science | Zykov I.Y.,Kemerovo State University | Nikitin A.P.,Kemerovo State University
Thermophysics and Aeromechanics | Year: 2013

A model to describe the heating of metal inclusions in inert media by a laser radiation pulse with allowance for the heat-transfer and melting processes in the matrix and inclusion materials is proposed. The time regularities of the heating of the matrix and inclusions were examined, and the dependences of the maximum temperature on the particle surface on the laser pulse energy density and on the particle radius were obtained. Approximate formulae for the maximum heating temperature and for the radius of most heated particles are proposed. We show that melting processes result in a reduction of the maximum heating temperature and in an insignificant variation of the radius of most heated particles. © 2013 Pleiades Publishing, Ltd. Source


Al'tshuler G.N.,RAS Institute of Coal Chemistry and Chemical Materials Science
Solid Fuel Chemistry | Year: 2012

The nanoreactor synthesis of pyridinecarboxylic acids-the precursors of biologically active compounds-was performed by the catalytic oxidation of coal tar components. The composite of Pd or Pd and Ag nanoparticles on a matrix of sulfonated polycalixresorcinarene was used as a nanoreactor. It was found that nicotinic acid can be obtained by the nanoreactor oxidation of βpicoline with cerium(IV) sulfate at 1.013 10 -5 Pa and 25-30°C. © 2012. Allerton Press, Inc. Source


Aduev B.P.,RAS Institute of Coal Chemistry and Chemical Materials Science | Nurmukhametov D.R.,RAS Institute of Coal Chemistry and Chemical Materials Science | Furega R.I.,RAS Institute of Coal Chemistry and Chemical Materials Science | Zvekov A.A.,RAS Institute of Coal Chemistry and Chemical Materials Science | Kalenskii A.V.,Kemerovo State University
Russian Journal of Physical Chemistry B | Year: 2013

The results of measurements of the threshold of explosive decomposition of PETN with 0.1 wt % additives of aluminum nanoparticles under the action of the first and second harmonics of a YAG:Nd3+ laser with a pulse duration of 12 ns are presented. A comparison of experimental and theoretical results is performed. It is concluded that the absorption of radiation heats the nanoparticles to form chemical decomposition kernels in the vicinity of the hotspot, so that the initiation of explosive decomposition is not associated with optical breakdown of the sample. © 2013 Pleiades Publishing, Ltd. Source

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