Химические науки список научных статей
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Formation of the metal-oxide nanocomposites during the partial reduction of Nd-Sr nickelates
A thermal reduction of Nd2−xSrxNiO4−δ (x = 0–1.4) solid solutions in an Ar/H2 gas mixture occurs in several separate stages. The initial stages of reduction presumably related to the reduction of Ni3+ to Ni2+ cause only minor changes in the initial K2NiF4 type structure and retain the morphology of ...
2023 / Sergey A. Malyshev, Oleg A. Shlyakhtin, Grigorii M. Timofeev, Galina N. Mazo, Ilya V. Roslyakov, Aleksander V. Vasiliev, Tatiana B. Shatalova, Aleksander L. KustovВАКESCI
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Alumina and silica supported Ce–Fe–O systems obtained by the solution combustion method and their performance in CO2 hydrogenation to syngas
This study presents Ce–Fe–O systems supported on γ-Al2O3 or SiO2 to enhance the reactivity of an oxygen-deficient CeFeO3 perovskite phase, which are promising catalysts for the production of fuels and chemicals from CO2 as feedstock. The synthesis was carried out by the glycine-nitrate solution...
2023 / Anna N. Matveyeva, Shamil O. Omarov, Marianna A. GavrilovaВАКESCI -
Optical glass-ceramics based on Fe2+: MgAl2O4 nanocrystals and nucleated by TiO2 and ZrO2
Transparent glass-ceramics of magnesium aluminosilicate system based on Fe2+:MgAl2O4 spinel nanocrystals nucleated by a mixture of TiO2 and ZrO2 and doped with 0.6 mol% FeO were developed. The glass was melted at 1580 ºC with stirring and heat-treated in the temperature range from 800 to 1300 ºC....
2023 / Vasilisa S. Bukina, Olga S. Dymshits, Irina P. Alekseeva, Anna A. Volokitina, Svetlana S. Zapalova, Aleksandr A. ZhilinВАКESCI -
Surface topology, electrophysical properties and formation mechanism of tin(ii) sulfide thin films
Photosensitive nanocrystalline SnS films with a size of coherent X-ray scattering regions of about 30 nm were obtained by chemical bath deposition. It has been demonstrated that the deposition time affects significantly both microstructure and thickness of the film as well as the size of the...
2023 / N.S. Kozhevnikova, L.N. Maskaeva, A.N. Enyashin, A.P. Tyutyunnik, O.A. Lipina, I.O. Selyanin, V.F. MarkovВАКESCI -
Planetary grinding’s impact on the structure and photocatalytic characteristics of urea-derived g-C3N4 nanocrystals
The burgeoning interest in two-dimensional materials derived from graphite carbon nitride (g-C3N4) stems from its non-toxicity, exceptional charge carrier mobility, and UV-vis absorption capabilities. Crucially, g-C3N4’s performance hinges on its specific surface area. We investigate how planetary...
2023 / Maria I. Chebanenko, Lev A. Lebedev, Maksim I. Tenevich, Ekaterina Yu. Stovpiaga, Vadim I. PopkovВАКESCI -
Effect of triethanolamine and sodium hydroxide concentration on the activity of Pt/gC3N4 catalyst in the reaction of photocatalytic hydrogen evolution under visible light irradiation
In this work, the dependences of the rate of photocatalytic hydrogen evolution under visible light irradiation on the concentration of triethanolamine and sodium hydroxide for 0.1 wt.% Pt/g-C3N4 photocatalyst were studied. The kinetic dependences of the reaction rate versus substrate initial...
2023 / Ksenia O. Potapenko, Ekaterina A. KozlovaВАКESCI -
Equilibrium of intrinsic and impurity point defects in Ca-doped Sm2Zr2O7
In this work, a doping strategy was used to achieve a good conductivity in samarium zirconate which crystallizes in the pyrochlore. The production of nanopowders made it possible to form high-density ceramics with an optimal microstructure. It is shown that intrinsic and impurity defects coexist in ...
2024 / Vladimir A. Vorotnikov, Semyon A. Belyakov, Alexey V. Ivanov, Yulia V. Novikova, Anna Yu. Stroeva, Vadim V. Grebenev, Dmitry N. Khmelenin, Olga V. Emelyanova, Maksim S. Plekhanov, Anton V. KuzminВАКESCI -
The effect of Ag(0) colloidal crystals and nanoribbons formation as a result of the redox reaction between Ce(III) and Ag(I) cations occurring on the surface of an aqueous solution of their salts mixture
The proposed study shows for the first time that gaseous ammonia treatment of AgNO3 and Ce(NO3)3 salts mixture aqueous solution surface gives rise to formation of a composite layer consisting of Ag(0) faceted colloidal crystals and nanoribbons, as well as CeO2 nanocrystals. A study of such a...
2024 / Valeri P. Tolstoy, Evelina E. Shilovskikh, Larisa B. GulinaВАКESCI -
Fluorination of Eu-doped layered yttrium hydroxides: the role of anionic composition
The fluorination processes of layered rare-earth hydroxides (LRHs) intercalated with various anions, including organic ones, have been compared for the first time. The fluorination process was investigated for chloride-, nitrateand 4-sulfobenzoate-intercalated Eu-doped layered yttrium hydroxides by ...
2024 / Zhanbo Liu, Svetlana V. Golodukhina, Svetlana V. Kameneva, Alexey D. YapryntsevВАКESCI -
Synthesis of strontium fluoride nanoparticles in a microreactor with intensely swirling flows
The technique of micromixing was used for synthesis of SrF2 nanopowders in a microreactor with intensely swirling flows. The chemical reaction between aqueous solutions of strontium nitrate (C(Sr(NO3)2) = 0.15 – 0.45 M) and potassium fluoride (C(KF) = 0.3 – 0.9 M) was realized in a microreactor...
2024 / Rufat Sh. Abiev, Andrey V. Zdravkov, Yuliya S. Kudryashova, Alexander A. Alexandrov, Sergey V. Kuznetsov, Pavel P. FedorovВАКESCI -
Sorption of polar and non-polar liquids by GO powders according to DSC experiments
The sorption properties of Hummers (HGO) and Brodie (BGO) graphite oxides with respect to various liquids were studied by the DSC method. In the case of HGO, the reduced material (RHGO) was obtained by hydrothermal synthesis. The effective reduction of the material was confirmed by XRD. The...
2024 / Alexander V. Kaplin, Elena A. Eremina, Mikhail V. KorobovВАКESCI -
Ultrasonic-assisted hydrothermal synthesis of nanoscale double ceric phosphates
The combination of ultrasonic exposure on ceric phosphate gels with subsequent hydrothermal-microwave treatment resulted in the formation of nanoscale NH4Ce2(PO4)3 or KCe2(PO4)3 phases. The sun protection factor (SPF) and protection factor against UV-A radiation (UVAPF) values for double ceric...
2024 / Taisiya O. Kozlova, Ekaterina D. Sheichenko, Darya N. Vasilyeva, Daniil A. Kozlov, Irina V. Kolesnik, Ilya V. Tronev, Maria A. Teplonogova, Alexander E. Baranchikov, Vladimir K. IvanovВАКESCI -
Synthesis of magnesium ferrite by combustion of glycine-nitrate gel: the influence of reagents on the gel-precursor and the microstructure of nanopowders
In this study, the influence of initial reagents on the phase composition and morphology of magnesium ferrite obtained by combustion of glycine-nitrate gel was investigated. The local environment of iron ions in the gel-precursor was studied in detail using FT-IR, XANESand EXAFSspectroscopy. It has ...
2024 / Maria N. Smirnova, Galina E. Nikiforova, Olga N. Kondrat’evaВАКESCI -
Structural, magnetic and electrochemical studies on ZnxMg1−xFe2O4 nanoparticles prepared via solution combustion method
Zinc-manganese ferrite nanoparticles, denoted as ZnxMg1−xFe2O4 where x ranges from 0 to 1, were synthesized via solution combustion employing glycine as the organic fuel at a stoichiometric redox ratio. The resultant compositions underwent comprehensive characterization utilizing scanning electron...
2024 / Kirill D. Martinson, Alexander A. Murashkin, Artem A. Lobinsky, Danil D. Maltsev, Kezhen Qi, Jiaguo Yu, Oksana V. Almjasheva, Vadim I. PopkovВАКESCI -
Pyrochlore phase in the Bi2O3–Fe2O3–WO3–(H2O) system: its stability field in the low-temperature region of the phase diagram and thermal stability
The concentration stability field localization of the pyrochlore-structured compounds of variable composition formed in the Bi2O3–Fe2O3–WO3 system under hydrothermal conditions at a temperature of T = 200 ºC and a pressure of P = 7 MPa was determined. It was found that the pyrochlore-structured...
2024 / Makariy S. Lomakin, Olga V. Proskurina, Aleksandr A. Levin, Vladimir N. NevedomskiyВАКESCI -
Nanocomposites of aromatic poly(amide-imide) with nanotubular Mg-Fe hydrosilicate
Composite films based on aromatic polyamide imide with carboxyl-containing fragments in repeating units (PAI-Ac) containing hydrosilicate nanotubes (Mg,Fe)3Si2O5(OH)4 are structurally sensitive to the molecular weight of the polymer used. According to Mössbauer spectroscopy data, nanotubes...
2024 / Svetlana V. Kononova, Galina K. Lebedeva, Valery S. Kozlov, Eleonora N. Korytkova, Tatyana P. Maslennikova, Elena V. Kruchinina, Elena N. Vlasova, Natalia N. Saprykina, Galina N. Gubanova, Milana E. Vylegzhanina, Vasiliy T. LebedevВАКESCI -
Green approach to production of porous char adsorbents via oxidative carbonization in fluidized catalyst bed
A green and energy-efficient technique for production of porous carbon-mineral chars from agricultural wastes (rice husk, wheat bran) and sedimentary carbonaceous feedstocks (high-ash peat, coal) was developed. It is based on partial combustion in fluidized bed of a deep oxidation catalyst at low...
2024 / Petr M. Yeletsky, Nikolay A. Yazykov, Yury V. Dubinin, Maksim M. Borodaevskiy, Svetlana A. Selishcheva, Vadim A. YakovlevВАКESCI -
The role of the reaction medium pH in the formation of nanocrystalline phases in the Bi2O3–P2O5–H2O system
The work is devoted to studying the influence of pH values in an aqueous-salt medium on the formation of compounds in the Bi2O3–P2O5–H2O(OH−, H+) oxide system. It has been shown that in an acidic environment (pH = 2) at a temperature of 298 K, hexagonal BiPO4 forms, while at pH values of 8 and 12,...
2024 / Dmitry P. Elovikov, Alena A. OsmininaВАКESCI -
Magnetic and photocatalytic properties of BiFeO3 nanoparticles formed during the heat treatment of hydroxides coprecipitated in a microreactor with intense swirling flows
In this work, hydroxide deposition in a microreactor with intensively swirling flows was used to obtain BiFeO3, followed by heat treatment of co-precipitated bismuth and iron hydroxides. The study of the formation of nanocrystalline bismuth orthoferrite was carried out using a set of methods:...
2024 / Olga V. Proskurina, Ksenia I. Babich, Sofia M. Tikhanova, Kirill D. Martinson, Vladimir N. Nevedomskiy, Valentin G. Semenov, Rufat Sh. Abiev, Victor V. GusarovВАКESCI -
Formation of chrysotile nanotubes with titania in the internal channel
The paper studies the influence of titanium-containing compounds on the formation of hydrosilicate nanotubes under hydrothermal conditions. The possibility of titanium ions to enter the crystal structure, and of titania the nanotube channel, has been analyzed. The influence of temperature on the...
2024 / Elmira N. Gatina, Tatiana P. MaslennikovaВАКESCI
