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Dive into the research topics where V. V. Gusarov is active.

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Featured researches published by V. V. Gusarov.


Glass Physics and Chemistry | 2004

Formation of Mg3Si2O5(OH)4 Nanotubes under Hydrothermal Conditions

E. N. Korytkova; A. V. Maslov; L. N. Pivovarova; I. A. Drozdova; V. V. Gusarov

The formation of nanotubes of magnesium hydrosilicate Mg3Si2O5(OH)4 with a chrysotile structure is investigated. It is found that the nanotubes of magnesium hydrosilicate Mg3Si2O5(OH)4 are formed through different mechanisms depending on the initial state of reactants, the composition of the hydrothermal solution, and temperature. It is shown that the rate of formation of nanotubes is determined by the stability of intermediate compounds, the chemical composition of the reaction mixture, and the synthesis temperature.


Glass Physics and Chemistry | 2006

Phase diagram of the LaFeO3-LaSrFeO4 system

E. A. Tugova; V. F. Popova; I. A. Zvereva; V. V. Gusarov

The phase relationships in the LaFeO3-LaSrFeO4 system at temperatures in the range 1000–2100°C in air are investigated, and the phase diagram of the system is constructed. One perovskite-like compound, namely, La2SrFe2O7, which belongs to the Ruddlesden-Popper phases, is revealed in the system.


Russian Journal of General Chemistry | 2007

Mechanism of formation of the complex oxide Gd2SrFe2O7

I. A. Zvereva; I. V. Otrepina; V. G. Semenov; E. A. Tugova; V. F. Popova; V. V. Gusarov

The mechanism of formation of the perovskite-like layered structure of the oxide Gd2SrFe2O7 was studied. The limiting stages are those of formation of phases with perovskite (GdFeO3, SrFeO3−x) and K2NiF4 (GdSrFeO4) structures. The Mössbauer study has shown that iron atoms exist in a heterovalent state (Fe3+ and Fe4+) only in the structure of SrFeO3−x).


Russian Journal of General Chemistry | 2010

Polymer-inorganic nanocomposites based on aromatic polyamidoimides effective in the processes of liquids separation

S. V. Kononova; E. N. Korytkova; T. P. Maslennikova; K. A. Romashkova; E. V. Kruchinina; I. L. Potokin; V. V. Gusarov

The polymer-inorganic nanocomposites based on the aromatic polyamidoimides and the silicate nanotubes of chrysotile structure were developed. The polyamidoimides were synthesized from dicarboxyphenylphthalimide dichloride by the polycondensation with either 4,4′-diaminodiphenyl ether or 3,5-diaminobenzoic acid. The morphology, mechanical and transport properties of the nanocomposite films were studied. Distribution of nanotubes in the composites is shown to be defined by the chemical structure of the polyamidoimide. The conditions for the formation of the composites were optimized to provide a significant increase in selective permeability toward alcohol and water in the process of pervaporation at the introduction of the nanotubes in the polymer.


Russian Journal of General Chemistry | 2013

Effect of surface melting on the formation and growth of nanocrystals in the Bi2O3-Fe2O3 system

N. A. Lomanova; V. V. Gusarov

Formation of nanocrystals in the Bi2O3-Fe2O3 system prepared by the co-precipitation of bismuth and iron hydroxides has been studied. The temperature of onset of the BiFeO3 and Bi2Fe4O9 nanocrystals formation is correlated with the melting point of the non-autonomous phases. The optimal temperature of BiFeO3 and Bi2Fe4O9 nanoparticles synthesis is 460–520 and 500–550°C, respectively.


Glass Physics and Chemistry | 2009

Influence of microwave and ultrasonic treatment on the formation of CoFe2O4 under hydrothermal conditions

V. A. Kuznetsova; O. V. Almjasheva; V. V. Gusarov

The formation of CoFe2O4 nanocrystals under hydrothermal conditions at a temperature of 130°C is investigated. The average size of CoFe2O4 particles varies from 6 to 11 nm depending on the synthesis time. The hydrothermal medium is heated by two different methods, i.e., the microwave (with a synthesis time from 1 min to 2 h) and conventional (with a synthesis time from 30 min to 45 h) methods. It is demonstrated that the use of microwave heating considerably accelerates the formation of CoFe2O4 particles. Preliminary ultrasonic treatment for 3 min increases the phase formation rate in the case of microwave heating and hardly affects the occurrence of the process upon conventional heating. It is revealed that the exposure of the initial mixture (preliminarily treated with ultrasound) to room temperature for 2 h or longer almost completely reduces the efficiency of the action of ultrasonic treatment on the phase formation process under hydrothermal conditions.


Russian Journal of Inorganic Chemistry | 2007

Hydrothermal synthesis of nanotubular Mg-Fe hydrosilicate

E. N. Korytkova; L. N. Pivovarova; O. E. Semenova; I. A. Drozdova; V. F. Povinich; V. V. Gusarov

Magnesium iron hydrosilicate nanotubes with a chrysotile ((Mg,Fe)3Si2O5(OH)4) structure have been synthesized hydrothermally at t = 250–450°C and p = 30–100 MPa. In the hydrothermal synthesis of (Mg,Fe)3Si2O5(OH)4 chrysotile, part of the Fe2+ ions oxidize to Fe3+ and are incorporated into the octahedron and tetrahedron layers of the chrysotile structure. The limiting iron content of chrysotile has been determined up to which cylindrically rolled layers can form to yield nanotubes. The hydrothermal treatment of precursors richer in FeO yields platelike hydrosilicates. The iron ions present in the starting components affect the synthesis parameters, morphology, size, optical properties, and thermal stability of the nanotubes.


Glass Physics and Chemistry | 2009

Preparation and thermal transformations of nanocrystals in the LaPO4-LuPO4-H2O system

A. V. Osipov; L. P. Mezentseva; I. A. Drozdova; S. K. Kuchaeva; V. L. Ugolkov; V. V. Gusarov

Powders of nanosized particles of individual and mixed lanthanum and lutetium orthophosphates are synthesized. The grain growth process is studied in the temperature range of 200–1100°C. Temperature and concentration regions of existence of the solid solutions based on hexagonal and monoclinic forms of LaPO4 as well as on tetragonal LuPO4 are determined.


Glass Physics and Chemistry | 2008

Influence of the preparation conditions on the size and morphology of nanocrystalline lanthanum orthoferrite

Nguyen An Tien; I. Ya. Mittova; O. V. Almjasheva; S. A. Kirillova; V. V. Gusarov

Nanocrystalline LaFeO3 is prepared by the dehydration of coprecipitated lanthanum and iron(III) hydroxides. It is shown that the behavior of the samples during heating and the size distribution of LaFeO3 nanocrystals can be considerably different depending on the scheme used for coprecipitation of lanthanum and iron hydroxides; independently of the method employed for coprecipitation of the initial compounds, sintering of the samples at 950°C leads to the formation of lanthanum orthoferrite crystals up to 100 nm in size.


Doklady Physics | 2007

Dynamics of Nanotube Twisting in a Viscous Fluid

S. A. Chivilikhin; I. Yu. Popov; V. V. Gusarov

Promising original materials for obtaining nanotubes are compounds with a layered structure [2], for example, hydrosilicates [3]. Irrespective of the structure of the original components, under hydrothermal conditions, nanotubes start to form only after intermediate compounds with a layered structure have been formed; it is precisely from these compounds that nanotubes are formed in the next stage of the synthesis [3, 4]. The investigation of the conditions and dynamics of layer twisting for compounds with a layered structure and their subsequent recrystallization with the formation of nanotubes with a certain morphology is of great importance for understanding the mechanism of nanotube formation.

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