Andrey Kuzharov

Andrey Kuzharov
Southern Federal University | sfedu · International Research Center Smart Materials

PhD

About

23
Publications
375
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68
Citations
Introduction
Andrey Kuzharov does research in Nanotribology, Lubrication, Nanomaterials and Nanoparticle Synthesis. Their current project is "Physico-chemical and tribological studies of liquid lubricants containing stabilized nanoparticles of Cu, Ag, Au".

Publications

Publications (23)
Article
The good wear-resistance of state-of-the-art liquid lubricants is due to the formation of complex metal and organometallic films onto the friction surface, reducing the friction and wear. For this purpose, various additives of metal nanopowders are used, especially ones based on copper. The formation and growth of Cu nanoparticles, as well as the t...
Article
The use of nanotechnologies in tribology has led to a large number of marketable lubricants containing nanoparticles with unproven efficiency. Tribological and physicochemical studies of some lubricant additives aimed at determining the tribological characteristics are presented in this work. It is found that applying metal particles (copper, above...
Article
The friction process is considered in this work from the viewpoint of chemical transformations, which occur in liquid lubricating medium and on the friction surface during the friction interactions. The results of tribotechnical tests of a conventional latten brass–glycerol–steel tribosystem are given and an attempt has been made to rationalize the...
Article
The results of studying the possibility of producing ultradispersed powders of metals, which can serve as components of metal-plating greases used to implement the effect of wearlessness during friction, from waste nickel–cadmium batteries are presented. Electrochemical mechanisms of the synthesis of Ni and Cd powders are studied, the chemical anal...
Article
This work presents the results of studying the efficiency of additives to motor and transmission oils, so-called remetallizers, which have achieved a dominant position in the automobile chemistry market. Previously conducted studies have shown that the investigated commercial remetallizers do not differ in their properties from standard metal-cladd...
Article
The rate and kinetics of electrochemical reduction of Cu2+ ions in aqueous and aqueous methylpyrrolidone electrolytes are found to depend on the structure of organic additives, which were derivatives of N-(2′-hydroxybenzyl)aniline with electron-donating or electron-withdrawing substituents. An increase in the content of cyclic lactam in the electro...
Article
Full-text available
The mechanism of the appearance of tribo-EMF autooscillations in steel-copper-alloy pairs in the case of self-organization in the wearless and transient friction modes is proposed; the mechanism is based on the assumption of the periodic coagulation of copper nanoclusters on the friction surface when the servovit film forms. It is shown that the go...
Article
Thermodynamic characteristics of non-spontaneous chemical reactions induced by friction are evaluated using the expression for the dissipative function of tribosystems in which at least one tribochemical reaction occurs. The model describing the rate of tribochemical reactions within framework of the activated complex theory is proposed. The estima...
Article
The paper presents results of precision experiment carried out to study the effect of some copper coordination compounds on tribological characteristics of paraffin oil. It is shown that the introduction of the studied complexes in the lubricant gives different ranges of friction parameters within which paraffin oil demonstrates improved antifricti...
Article
A hypothesis was presented to explain the mechanism of self-organization in tribosystems with boundary lubrication by deactivation of inversely populated levels of excited states of the active material. High quality commercial oils Hipol-15, ZC-90, and Spirax 80 were used for lubrication. A kinetic description of the classic example of self-organiz...
Article
A hypothesis is proposed to explain the mechanism of self-organization in tribosystems with boundary friction by the deexcitation of inversely populated levels of excited states of the active substances. It is shown that deexcitation of the activated substance in the tribological systems during boundary friction by chemical and tribochemical reacti...
Article
The possible molecular mechanisms of fluid viscosity reduction in orientation-ordered medium were presented. Models were developed for a reduction in viscosity of structurally ordered fluid at hydrodynamic lubrication. According to the statistical description of liquid structure, the mechanism of resistance to shear was related to the short-range o...
Article
A molecular mechanism was proposed to explain synchronous autooscillations of the friction coefficient and electrical resistance in the friction contact of a bronze-steel pair detected experimentally when dispersion of nanometer Cu clusters in a water-glycerin mixture serves for lubrication. The tribological effectiveness of Cu nanoclusters in achi...
Article
The orientation of fluid particles in flow indicated that the ordering of lubricants under conditions of hydrodynamic lubrication and EHL plays an important role. The ordering or the self-organization of dynamic orientational structure of lubricants in the hydrodynamic clearance resulted from the action of two opposing factors, gradient flow and te...
Article
Models are proposed to explain the causes of reduction of the viscosity of the dynamically structurally ordered fluid during hydrodynamic friction. These models explain the existence of the point of bifurcation on the dependence of the force of friction on the loading, when mass and impulse transfer changes the hole mechanism to the relay mechanism...
Article
Hydrodynamic friction of a moving viscoplastic fluid in the cylindrical bearing has been analyzed theoretically by integrating a complete system of nonlinear, nonstationary equations of Genky-Ilyushin. It has allowed to identify a dimensionless parameter dividing the hydrodynamic friction are into two modes. Experimental validation of this result b...
Article
Physical substantiation of the self-organization in conditions of hydrodynamic and elastohydrodynamic friction owing to liquid structurization in a gradient flow is proposed. Role of the dissipative function in the mechanism of decreasing the friction force is discussed for the case of continuous growth of the flow velocity gradient in the hydrodyn...
Article
A molecular mechanism is advanced to explain the synchronous self-oscillations of the friction coefficient and electrical resistance in the friction contact between bronze and steel when nanostructured copper clusters dispersed in the water-glycerin mixture lubricate them. The mechanism of self-organization is based on the assumption that clusters...
Article
The investigation results of tribological and physical-chemical characteristics of the surface in a copper alloy-glycerin-steel tribosystem are presented. The data show the formation of dielectric films on the steel surface to occur rapidly even at the initial moment of friction. Transfer of the copper alloy and formation of the servovit film proce...
Article
The results of the investigation of tribotechnical properties and physico-chemical characteristics of the surface in tribosystem 'copper alloy-glycerin-steel' are presented. The results show that process of the forming non-conductive films on steel surface proceed rapidly and take place already in the first moment of the frictional interaction. The...

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Project (1)
Project
This work makes attempts to consider some aspects of the tribological use of Cu, Ag, Au nanoparticles and nanoparticle building mechanisms and study their influence on the lubrication mechanism, using physico-chemical (dynamic light scattering, atomic force microscopy and electron microscopy) and tribological studies.