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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dorovskikh S. I., Klyamer D. D., Krasnov P. O., Shutilov R. A., Nasimov D. A., Prosvirin I. P., Volchek V. V., Zharkov S. M., Khubezhov S. A., Morozova N. B., Basova T. V.
Заглавие : Ultrafine Ir-IrO2 nanoparticles for decoration of cobalt phthalocyanine films as an active component for highly sensitive detection of nitric oxide
Колич.характеристики :12 с
Место публикации : Mater. Sci. Eng. B: Solid-State Mater. Adv. Technol. - 2025. - Vol. 314. - Ст.118074. - ISSN 09215107 (ISSN), DOI 10.1016/j.mseb.2025.118074. - ISSN 18734944 (eISSN)
Примечания : Cited References: 69. - The work devoted to the study of the sensor response to NO as well as DFT calculations were supported by the Ministry of Science and Higher Education of Russian Federation (projects 121031700314-5 and FSRZ 2023-0006)
Аннотация: Nitric oxide is an important molecule that plays a crucial role in regulating physiological processes in mammals. To develop a sensitive method for detecting NO, new heterostructures based on cobalt phthalocyanine (CoPc) films decorated with Ir-IrO2 nanoparticles were considered as active layers of chemiresistive sensors for the direct NO detection. Within deposition conditions, Ir-IrO2 nanoparticles with an Ir concentration of 0.48–1.5 µg/cm2, a fraction of IrO2 phase of 10–20 %, and particles sizes from 1 to 3 to 14 nm were obtained on the surface of CoPc films. The influence of these parameters of Ir-IrO2 particles on the sensor response of Ir-IrO2/CoPc heterostructures to NO was investigated using theoretical and practical approaches. Based on DFT calculations, an electronic sensitization mechanism of NO detection by Ir-IrO2/CoPc heterostructures was proposed. These heterostructures are able to detect of NO gas at the ppb level and show the selectively to NOx in the presense of other gases.
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Вид документа : Статья из журнала
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Автор(ы) : Ivanova O. S., Edelman I. S., Zharkov S. M., Vorobyev S.A., Andryushchenko T.A., Molokeev M. S., Sukhachev A. L., Lin Ch.-R., Chen Y.-Zh., Huang B.-X.
Заглавие : Impact of annealing temperature on the structure, magnetic properties, and organic dyes adsorption capacity of Fe0.5Co2.5O4 nanoparticles obtained by combustion
Колич.характеристики :11 с
Место публикации : J. Alloys Compd. - 2025. - Vol. 1011. - Ст.178421. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2024.178421. - ISSN 18734669 (eISSN)
Примечания : Cited References: 39. - The work was supported by the Russian Science Foundation (project no. 23–22–10025, and by the Krasnoyarsk Regional Fund of Science and Technology Support. The powder diffraction and magnetic measurements were carried out at the analytical equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS". The authors also thank the Laboratory of Electron Microscopy of the Siberian Federal University Joint Scientific Center for assistance in conducting the electron microscopy investigations
Аннотация: Fe-doped cobalt oxide nanoparticles, FexCo3-xO4, attract considerable attention due to their unique properties, high application potential, and the ability to vary the properties over a wide range by changing the technological conditions. The annealing temperature is one of the decisive parameters critically affecting the properties of nanoparticles. In this work, we studied the Fe0.5Co2.5O4 (Co3O4 type) nanoparticles synthesized by the combustion method: the impact of annealing temperature (400, 500, 600, 700 and 800 °C) on their structural, morphological, magnetic characteristics and on their ability to absorb organic dyes. X-ray diffraction analysis revealed that the nanoparticles under study consisted of a crystalline phase of Fe0.5Co2.5O4, with an admixture of the iron oxide phase in trace concentrations. A giant increase in the crystallite size due to annealing was observed. Overall, the average crystallite size increased from ⁓5 nm in the as-prepared sample to ⁓110 nm in the sample annealed at 800 °C. These changes in size are explained by the efficiency of the Ostwald ripening process. They are accompanied by an increase in the magnetization of nanoparticles and an appearance of magnetic hysteresis. The study of the adsorption properties of the nanoparticles with respect to the most important water pollutants – organic dyes, i.e. cationic methylene blue (MB) and anionic Congo red (CR) revealed their high selective adsorption capacity to CR. The as-prepared nanoparticles had the highest capacity: the CR dye concentration in water decreased by 90 percent within 5 minutes of exposure to the nanoparticles in concentration of 1 g/L. When the annealing temperature increased from 400 to 800 °C, the adsorption capacity decreased by approximately half, but remained high enough to consider these nanoparticles as a promising material for CR selective removal from water.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Rajaramakrishna R., Nikonorov N., Wantana N., Kim H. J., Kothan S., Intachai N., Busayaporn W., Kaewkhao J., Parfenova E. V., Aleksandrovsky A. S.
Заглавие : Quantum yield, energy transfer, and x-ray induced study of Sm3+ ions doped oxide glasses for intense orange-red photo-emitting optoelectronic device applications
Колич.характеристики :12 с
Место публикации : Chem. Phys. - 2025. - Vol. 590. - Ст.112528. - ISSN 03010104 (ISSN), DOI 10.1016/j.chemphys.2024.112528. - ISSN 18734421 (eISSN)
Примечания : Cited References: 36. - The author R. Rajaramakrishna thank Professor Dr. J. Kaewkhao, and Prof. S. Kothan. Also, thanks to Prof Evgenia Slyusareva for kind support. The author R. Rajaramakrishna thank ITMO Fellowship program, St Petersburg Russia, Siberian Federal University Russia, Nakhon Pathom Rajabhat University (NPRU) Thailand, and Synchrotron light research institute (SLRI), Nakhon Ratchasima ThailandWe are also grateful to Thailand Science Research and Innovation (TSRI) for supporting this research. This research has received funding support from the NSRF via the Program Management Unit for Human Resources & Institutional Development, Research and Innovation [grant number B41G670028]. This research was partially supported by Chiang Mai University. This research project was supported by Fundamental Fund 2025, Chiang Mai University
Аннотация: The work elucidates detailed analysis of X-ray near edge structure of Gd3+ ions using Synchrotron studies and deciphers the energy transfer mechanism involved in the stoichiometric ratio of (79-x)B2O3 + 10ZnO + 10BaO + xGd2O3 + 1Sm2O3 (BZBGS; x = 0, 5, 10, 15, 20 mol.%) glasses. A detailed analysis of the glasses’ optical, structural, and luminescence properties were instigated to understand light emitting and scintillating behaviour. The oxidation state of Gd atom inside the glass found to be + 3. Stimulated emission cross section, radiative transition probability and branching of the metastable state of rare-earth ions were evaluated using Judd-Ofelt model and compared with other reported literature. Photo-Emission spectra were monitored at the UV-C band and X-rays. Luminescence was analysed with various excitation wavelengths and sources. Photoluminescence quantum yield show more than 22 % efficiency and show more than 15 % compared with other reported glasses. Luminescence intensity ratio was analysed and found that the Sm3+-ions do not occupy the inversion-symmetry which enhances the luminescence intensity in the present glass system. The CIE and CCT values were evaluated and discussed.
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Вид документа : Статья из журнала
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Автор(ы) : Karpov D. V., Vorobyev S.A., Bayukov O. A., Knyazev Yu. V., Velikanov D. A., Zharkov S. M., Larichev Yu. V., Saikova S. V., Zitoun D., Mikhlin Yu.
Заглавие : Unraveling the structure and properties of high-concentration aqueous iron oxide nanocolloids free of steric stabilizers
Колич.характеристики :11 с
Место публикации : J. Am. Chem. Soc. - 2025. - Vol. 147, Is. 10. - P.8467-8477. - ISSN 00027863 (ISSN), DOI 10.1021/jacs.4c16602. - ISSN 15205126 (eISSN)
Примечания : Cited References: 85. - Facilities of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk ScienceCenter SB RAS" and the Center of Collective Use of the Siberian Federal University were employed. We are grateful to Dr. A. Hubly and Dr. G. Manna for the SAXS/USAXS measurements, and the ESRF for the beamtime at ID02 beamline. Y.M. acknowledges partial funding from the Israel Ministry of Absorption. D.Z. acknowledges partial fundingfrom the Israel Ministry of Energy
Аннотация: Aqueous colloids with a high concentration of nanoparticles and free of steric stabilizers are prospective soft materials, the engineering of which is still challenging. Herein, we prepared superparamagnetic colloids with very large, up to 1350 g/L concentration of 11 nm nanoparticles via Fe2+ and Fe3+ coprecipitation, water washing, purification using cation-exchange resin, and stabilization with a monolayer of citrate anions (ζ potential of diluted dispersions about −35 mV). XRD, XPS, Mössbauer, and FTIR spectra elucidated the defective reverse spinel structure of magnetite/maghemite (Fe3O4/γ-Fe2O3) with a reduced content of Fe2+ cations. The viscosity increases with nanoparticle concentration and depends also on the nature of citrate salt, being one order of magnitude lower for lithium than sodium and potassium as counter-cation. SAXS/USAXS curves show power-law behavior in the scattering vector range between 0.1 and 0.002 nm–1, suggesting that particles interact forming fractal clusters, which are looser for Na+- and denser for Li+-citrate stabilizers (fractal dimensions of 1.9 and 2.4, respectively). In parallel, ATR-FTIR found increasing proportions of symmetric O–H stretching vibrations of ice-like interfacial water in the concentrated colloids. We hypothesize that the clusters arise due to the attraction of like-charge particles possibly involving the water shells and hydration of counter-cations; overlapping the clusters and transition to continuous non-Newtonian phases is seen at viscosity vs concentration plots at 700–900 g/L. The results shed new light on the structure of very concentrated nanocolloids and pave the way for their manufacturing and tailoring.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Demianov A. S., Dobrosmyslov S. S., Nagibin G. E., Voronin A. S., Simunin M. M., Kyylar A. A., Molokeev M. S., Fedorova E. N., Perkova M. A., Nemtsev I. V., Khartov S. V.
Заглавие : Investigation of the influence of hydrofluoric acid and temperature on the sintering processes and phase formation in alumina nanofiber-based ceramics
Колич.характеристики :10 с
Место публикации : Eng. Technol. Appl. Sci. Res. - 2025. - Vol. 15, Is. 3. - P.22792-22801. - ISSN 22414487 (ISSN), DOI 10.48084/etasr.9547. - ISSN 17928036 (eISSN)
Примечания : Cited References: 41. - Electron microscopy measurements were performed on the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS". The work was carried out within the state assignment No. FWES-2024-0026 of Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences"
Аннотация: This work studies a ceramic material, synthesized from alumina nanofiber via semi-dry pressing with an average diameter of 10 nm and a high aspect ratio (˃1000), with Hydrofluoric Acid (HF) used as a mineralizer. The effects of varying firing temperature and HF concentration were systematically investigated. The material was characterized using electron microscopy, X-ray fluorescence analysis, and X-ray phase analysis, while thermodynamic calculations of phase transformations were conducted. Additionally, strength, density, and open porosity were analyzed as functions of the processing parameters. The analysis revealed that an optimal HF concentration of 1% and a firing temperature of 800 °C yield the best physical and mechanical properties. Furthermore, the transition mechanism from the γ-phase to the α-phase under varying HF concentrations and firing temperatures was examined. A linear dependence of the concentration of Fluorine (F) atoms in the ceramic material on the firing temperature was established. The maximum physical and mechanical characteristics include a compressive strength of 49 MPa with a porosity of 46% and a density of 1.47 g/cm³.
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Вид документа : Статья из журнала
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Автор(ы) : Kireeva A. V., Kolenchukova O. A., Biryukova E. A., Stolyar S. V.
Заглавие : Effect of synthetic and biogenic iron oxide nanoparticles on histopathological parameters of mouse kidneys
Колич.характеристики :12 с
Место публикации : J. Evol. Biochem. Physiol. - 2025. - Vol. 61, Is. 1. - P.261-272. - ISSN 00220930 (ISSN), DOI 10.1134/S0022093025010211. - ISSN 16083202 (eISSN)
Примечания : Cited References: 33. - This work was supported by ongoing federal budget funding to the Scientific Research Institute of Medical Problems of the North (FWES 2024-0016)
Аннотация: The unique physical, chemical and magnetic properties of ironoxide nanoparticles (INPs) open up wide prospects for the use ofnanomaterials in the diagnosis and therapy of various diseases.Despite the high interest from the scientific community, the mechanismof the effect of INPs on the physiology of living organisms hasnot been fully investigated. This is not least due to the fact thatthe toxicity of nanoparticles depends on multiple factors, includingtheir size, method of synthesis, and the presence of a shell. Thiswork was aimed to study the effect of synthetic and biogenic ferrihydriteINPs on the mouse kidney morphology, depending on the method oftheir synthesis and the presence of a polysaccharide shell afteroral administration. The animals (n =55) were allocated into 3 groups: group 1 (n =15)—control mice, fed food without INP supplementation; group 2(n = 20)—experimental mice,fed food supplemented with synthetic uncoated INPs; group 3 (n = 20)—experimental mice, fed food supplementedwith encapsulated biogenic INPs. The biological material (mousekidney) was sampled for standard histological examination a daybefore the onset of feeding with INP supplementation, as well as ondays 22 and 36 after that. It was found that long-term administrationof both synthetic and biogenic INPs was accompanied by hemodynamicdisorders in the kidney, as well as dystrophic and necrotic alterationsin renal parenchymal cells, leading to the development of renalfailure. Biogenic INPs displayed a highest reactivity, which isprobably due to the presence of a polysaccharide shell and the crystallinestructure of the ferrihydrite core.
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Вид документа : Статья из журнала
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Автор(ы) : Karpov I. V., Fedorov L. F., Drokin N. A.
Заглавие : Investigation of the process of structural modification of UHMWPE with CuO nanoparticles on the frequency and temperature dependence of the dielectric characteristics of the composite
Колич.характеристики :8 с
Место публикации : IEEE Trans. Dielectr. Electr. Insul. - 2025. - Article in press. - ISSN 10709878 (ISSN), DOI 10.1109/TDEI.2025.3548971. - ISSN 15584135 (eISSN)
Примечания : Cited References: 34. - The work has been performed under the state assignment FWES-2024-0026
Аннотация: Using vacuum-arc synthesis, Ultra-high molecular weight polyethylene (UHMWPE)/nano CuO composite samples with a CuO nanoparticle content of 0 to 3 wt.% were obtained. It was found that with an increase in the concentration of nanoparticles, their agglomeration is possible. In addition, with an increase in the concentration of CuO nanoparticles, and accordingly an increase in the time of the polymer modification process, some of the non-polar groups ˃ CH2 are converted into polar groups ˃ C=O, which are easily embedded in the UHMWPE crystal lattice. The electrical properties of pure UHMWPE and UHMWPE/CuO composites were studied by impedance spectroscopy in the frequency range from 102 to 108 Hz and temperatures from 300 K to 420 K. It was found that the dielectric properties of the composite with a CuO nanoparticle content of up to 1 wt.% do not undergo any special changes. The permittivity does not depend on frequency, while the dielectric losses are associated only with through conductivity. With increasing temperature, due to thermal expansion of the polymer and a decrease in its density, the permittivity decreases. With an increase in the nanoparticle content from 2 to 3 wt.% at a frequency of 106 Hz, dielectric relaxation in UHMWPE/nano CuO associated with the formation of polar groups is observed. With increasing temperature, dipole polarization is activated. As a result, dielectric losses increase.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karpov I.V., Fedorov L. Yu, Abkaryan A.K., Zharkov S. M., Molokeev M. S., Ivanenko A. A., Nemtsev I. V., Irtyugo L.A.
Заглавие : Resistive switching properties of a nanostructured layer of mixed ZrO2 phases obtained in low-pressure arc discharge plasma
Колич.характеристики :9 с
Место публикации : Vacuum. - 2024. - Vol. 227. - Ст.113375. - ISSN 0042207X (ISSN), DOI 10.1016/j.vacuum.2024.113375. - ISSN 18792715 (eISSN)
Примечания : Cited References: 34. - The work was performed with a support of the grant of the Russian Science Foundation (Project No. 24-29-00374, https://rscf.ru/project/24-29-00374/)
Аннотация: The controlled vacuum-arc synthesis of zirconium dioxide (ZrO2) nanoparticles is considered, which makes it possible to regulate the percentage ratio of the monoclinic and tetragonal phases. The samples were characterized using XRD analysis, SEM, HRTEM analysis, FT-IR analysis, TG/DTA analysis and EPR spectroscopy. It has been established that the formation of the tetragonal phase is associated with the formation of a large number of oxygen vacancies formed due to high-speed quenching of nanoparticles. Reducing the operating gas pressure in a vacuum chamber from 180 Pa to 30 Pa makes it possible to obtain nanoparticles up to 2 nm in size. The synthesized ZrO2 nanoparticles do not contain foreign impurities and when heated, the weight loss is up to 7 %. The process of local resistive switching in the contact of an atomic force microscope (AFM) probe to a nanostructured ZrO(2-x) layer on a conducting substrate has been studied. Cyclic current-voltage characteristics demonstrate the existence of stable states of high and low resistance, switched by changing the polarity of the applied voltage. The coexistence of the m- and t-ZrO2 phases (and the resulting oxygen nonstoichiometry in the interboundary regions) provides conditions for the formation/destruction of a filament from oxygen vacancies, which determine the conductivity of the dielectric in the LRS state.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Яцык И. В., Еремина Р. М., Мошкина, Евгения Михайловна, Попов Д. В., Шестаков А. В.
Заглавие : Спин-волновой резонанс в монокристалле железо-галлиевого оксида
Коллективы : "Новое в магнетизме и магнитных материалах", международная конференция, Научный совет по физике конденсированных сред РАН, МИРЭА - Российский технологический университет, Московский государственный университет им. М.В. Ломоносова, Магнитное общество России
Место публикации : Новое в магнетизме и магнитных материалах: сборник трудов XXV международной конференции/ прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2024. - Секция 6 [Сборник 6]: Резонансные явления в магнетиках. - С. 17-20. - ISBN 978-5-4465-1869-2
Примечания : Библиогр.: 15
Аннотация: В спектрах электронного спинового резонанса для монокристалла Fe1.1Ga0.9O3 обнаруженo множество линий, которые можно отнести к проявлению спин-волнового резонанса. Для данного соединения из температурной зависимости намагниченности определена температура фазового перехода ферримагнетик-парамагнетик TC = 288 K и из температурной зависимости спектров электронного спинового резонанса определена температура Кюри – Вейсса (θCW = 289 K).
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarenko L., Baimuratova R., Dzeranov A., Pankratov D., Kicheeva A., Sushko E., Kudryasheva N., Valeev R., Tropskaya N., Dzhardimalieva G., Kydralieva K.
Заглавие : Fenton reaction-driven pro-oxidant synergy of ascorbic acid and iron oxide nanoparticles in MIL-88B(Fe)
Колич.характеристики :19 с
Место публикации : New J. Chem. - 2024. - Vol. 48, Is. 22. - P.10142-10160. - ISSN 11440546 (ISSN), DOI 10.1039/D4NJ00963K. - ISSN 13699261 (eISSN)
Примечания : Cited References: 94. - This research was funded by the Russian Science Foundation, grant number 22-73-10222. XPS spectra of the FeO-AA MOF sample were recorded on the equipment of the shared core facilities "Center of physical and physicochemical methods of analysis, investigations of properties and characteristics of surface, nanostructures, materials and products" of the Udmurt Federal Research Center of UB RAS. The Mossbauer analysis was performed in accordance with the state order of Lomonosov Moscow State University "Solving of problems of nuclear energy and environmental safety, as well as diagnostics of materials using ionizing radiation" (project no. 122030200324-1)
Аннотация: MIL-88B, a promising Fe-based 3D porous metal–organic framework (MOF) catalyst for the Fenton reaction, requires modifications to enhance its pro-oxidant activity and enable magnetic control of the sample. This study reports the successful modification of MIL-88B with iron oxide (Fe3O4) and ascorbic acid (AA). The characterization of the crystal structure and morphology of the Fe3O4–AA MOF sample using X-ray diffraction, Raman and Mossbauer spectroscopy, and scanning electron microscopy revealed that AA facilitated the formation of magnetite with a composition approaching a stoichiometry of Fe2.96O4 while preserving the MOF structure. Specifically, in the presence of hydrogen peroxide (H2O2), Fe3O4–AA–MOF exhibited a 3-fold increase in the Fenton reaction rate for methylene blue degradation compared to the conventional homogeneous system at pH 4.5. Furthermore, Fe3O4–AA–MOF retained the antibacterial properties of AA, as evidenced by its ability to increase reactive oxygen species in luminescent marine bacterium Photobacterium phosphoreum at low concentrations while exhibiting moderate cytotoxicity. The enhanced pro-oxidant activity of the Fe3O4–AA–MOF/H2O2 system is attributed to an AA-promoted surface Fe2+/Fe3+ cycle. A possible mechanism for this system is proposed.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nikiforov A. A., Krylov A. S., Krylova S. N., Gorshkov V. S., Pelegov D. V.
Заглавие : Temperature Raman study of Li4Ti5O12 and ambiguity in the number of its bands
Колич.характеристики :10 с
Место публикации : J. Raman Spectrosc. - 2024. - Vol. 55, Is. 3. - P.406-415. - ISSN 03770486 (ISSN), DOI 10.1002/jrs.6641. - ISSN 10974555 (eISSN)
Примечания : Cited References: 51. - The research was funded by the Russian Science Foundation (project No 22-22-00350, https://rscf.ru/project/22-22-00350)
Аннотация: The two primary physical methods for identifying lithium titanate, a negative electrode material used commercially, are X-Ray diffraction and Raman spectroscopy. Although there are many publications on this topic, they are focused mainly on chemistry, so there are still some points that require clarification from a physical and methodological point of view. Difference of experimentally observed and theoretically predicted Raman spectra was explained through a combination of experiments and computations. The work comprises experiments and computations to explain why there are different numbers of predicted and observed Raman-active bands. Our low-temperature study and the analysis of thermal shifts during heating led us to conclude that the approach with surplus bands is advantageous and we recommend using major F2g band shifts to estimate the sample heating.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shvets P., Krylov A. S., Maksimova K., Goikhman A.
Заглавие : Raman spectroscopy of Wadsley phases of vanadium oxide
Колич.характеристики :14 с
Место публикации : J. Raman Spectrosc. - 2024. - Vol. 55, Is. 4. - P.445-458. - ISSN 03770486 (ISSN), DOI 10.1002/jrs.6644. - ISSN 10974555 (eISSN)
Примечания : Cited References: 133. - This work was prepared with support from the Ministry of Science and Higher Education of the Russian Federation (project FZWM-2020-0008)
Аннотация: We summarize the current knowledge on crystal structures, synthesis, applications, and Raman spectroscopy of Wadsley phases of vanadium oxide, including VO2 (B), V6O13, V4O9, V3O7, and V2O5. While these oxides have garnered significant attention for potential energy storage applications and have been studied for decades, there remains inconsistency in data regarding their characteristic Raman spectra. To address this, we synthesized a series of Wadsley phases by physical vapor deposition of amorphous vanadium oxide films and subsequent annealing in a controlled environment. X-ray diffraction studies confirmed the formation of VO2 (B), V6O13, V4O9, and V3O7. We meticulously measured the room-temperature Raman spectra of these phases, offering robust reference data for the easy identification of vanadium oxides in unknown samples. Finally, we studied low-temperature phase transitions in VO2 (B) and V6O13.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Дубровский, Андрей Александрович, Семенов, Сергей Васильевич, Князев, Юрий Владимирович, Кириллов В. Л., Балаев, Дмитрий Александрович, Мартьянов, Олег Николаевич
Заглавие : Эволюция фазового состава и магнитных свойств композита на основе наночастиц ε-Fe2O3, иммобилизированных в ксерогель SiO2, при увеличении концентрации оксида железа и магнитные свойства наночастиц ε-Fe2O3, извлеченных из композита ε-Fe2O3/ксерогель
Коллективы : "Новое в магнетизме и магнитных материалах", международная конференция, Научный совет по физике конденсированных сред РАН, МИРЭА - Российский технологический университет, Московский государственный университет им. М.В. Ломоносова, Магнитное общество России
Место публикации : Новое в магнетизме и магнитных материалах: сборник трудов XXV международной конференции/ прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2024. - Секция 9 [Сборник 9]: Магнитные наноструктуры. Малые магнитные частицы. - С. 120-123. - ISBN 978-5-4465-1869-2
Примечания : Библиогр.: 4. - РНФ, Красноярский краевой фонд науки, грант № 24-12-20011
Аннотация: ε-Fe2O3 является достаточно редкой полиморфной модификацией оксида железа и существует только в виде наночастиц. Как и во всех наноструктурах, поверхностные и размерные эффекты играют важную роль в проявляемых магнитных свойствах. В данной работе мы исследовали эволюцию фазового состава и магнитных свойств композита на основе наночастиц ε-Fe2O3, иммобилизированных в ксерогель SiO2, при увеличении концентрации оксида железа и сопутствующего данному увеличению роста размеров наночастиц оксида железа, а также магнитные свойства наночастиц ε-Fe2O3, извлеченных из композита ε-Fe2O3/ксерогель.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasitskaya V. V., Drandrova K. A., Tyumentseva A. V., Vazhenina I. G., Lukyanenko A. V., Stolyar S. V., Frank L. A.
Заглавие : Concanavalin A–activated magnetic nanoparticles as an affine material for urinary exosome isolation
Колич.характеристики :11 с
Место публикации : Biotechnol. Appl. Biochem. - 2024. - Article in press. - ISSN 08854513 (ISSN), DOI 10.1002/bab.2696. - ISSN 14708744 (eISSN)
Примечания : Cited References: 41. - The HRTEM, SEM, and AFM studies as well as chromatographic purification of recombinant proteins were carried out on the equipment of the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. The investigations of the exosome isolation by ultracentrifugation were carried out using the equipment of the Shared Core Facilities Molecular and Cell Technologies, Krasnoyarsk State Medical University. The NTA was performed using the equipment of the Center for Collective Use No. 40606 “Functional mapping of the brain” of the Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences. The authors are grateful to I. V. Nemtsev and M. N. Volochaev (Federal Research Center KSC SB RAS) for the SEM and HRTEM measurements, respectively, Y. V. Gerasimova (Kirensky Institute of Physics SB RAS, Federal Research Center KSC SB RAS) for FTIR measurements, and S. A. Vorobyev (Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center KSC SB RAS) for DLS measurements. The authors thank the volunteers who took part in the experiment, as well as doctor A. V. Mazaev (Krasnoyarsk Regional Clinical Oncological Dispensary named after A. I. Kryzhanovsky) who provided a sample of a patient with BC
Аннотация: Exosomes are a type of membrane vesicle secreted into the extracellular medium by most cell types. They have a great potential for clinical practice as noninvasive biomarkers for diagnosis of various diseases, prognosis, and monitoring of therapy, which stimulates the development of simple methods for isolating exosomes from biological fluids. A novel affine material based on aminosilanized superparamagnetic core?shell nanoparticles for fast isolation of urinary exosomes is reported. Iron oxide nanoparticles coated with amino organosilane have been synthesized. The structural and magnetic characteristics of the resulting nanoparticles have been studied by transmission electron microscopy and ferromagnetic resonance. The surface of the synthesized nanoparticles has been chemically functionalized with lectin (concanavalin A), and the efficiency of the obtained material as a sorbent for affine exosome isolation from human urine has been demonstrated. A highly purified fraction of exosomes 90?200 nm in size has been obtained. The exosomal nature of the isolated vesicles has been confirmed by bioluminescent solid-phase microassay of tetrasporine receptor markers. The presence of exosomal miR-21 in the isolated human urine exosome samples has been established.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Волкова И. Р., Тырышкина, Лариса Егоровна, Немцев, Иван Васильевич, Афанасова К. А., Лямкин А. И.
Заглавие : Композиционные никель-фосфорные покрытия с добавкой нановолокон оксида алюминия "Алюминан"
Колич.характеристики :5 с
Место публикации : Южно-Сибир. науч. вестн. - 2024. - № 6. - С. 79-83. - ISSN 23041943 (eISSN), DOI 10.25699/SSSB.2024.58.6.003
Примечания : Библиогр.: 11
Аннотация: В работе рассматривалась возможность использования нановолокон оксида алюминия марки "Алюминан" в химических никель-фосфорных (Ni-P) покрытиях. Были проведены исследования морфологии полученных композиционных покрытий и их структуры. Показано, что введение нановолокон алюминия в никель-фосфорную матрицу снижает пористость покрытий, а также увеличивает микротвердость покрытий, подвергшихся термообработке, подтверждая их армирующее действие. Нановолокна марки "Алюминан" могут быть рассмотрены как перспективный материал для использования в металлических покрытиях.The paper considered the possibility of using aluminum oxide nanofibers of the Aluminan brand in chemical nickel-phosphorus (Ni-P) coatings. The morphology of the obtained composite coatings and their structure were studied. It is shown that the introduction of aluminum nanofibers into a nickel-phosphorus matrix increases the microhardness of coatings subjected to heat treatment, confirming their reinforcing effect. Nanofibers of the Aluminan brand can be considered as a promising material for use in metal coatings.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Самошкина, Юлия Эрнестовна, Черниченко А. В.
Заглавие : Магнитный круговой дихроизм оксидных плёнок: изучение электронных, магнитных и зарядовых состояний
Колич.характеристики :8 с
Место публикации : Приборы и методы измер. - 2024. - Т. 15, № 3. - С. 240-247. - ISSN 22209506 (ISSN), DOI 10.21122/2220-9506-2024-15-3-240-247; Devices Meth. Meas. - ISSN 24140473 (eISSN)
Примечания : Библиогр.: 25
Аннотация: Полупроводниковые материалы на основе оксидов ZnO и RE3+MnO3 рассматриваются как потенциальные кандидаты для спинтроники. В работе представлены методика и результаты исследования эффекта магнитного кругового дихроизма для плёночных структур Zn1-xCoxO, Zn1-x-yCoxAlyO и RE1-x 3+Ax 2+MnO3 в диапазоне видимого излучения. Показано, что поведение магнитного кругового дихроизма плёнок манганита отражает не только магнитную, но и зарядовую составляющую материала. Это указывает на возможность исследования магнитных и транспортных характеристик плёнок с помощью магнитного кругового дихроизма спектроскопии. Поскольку магнитный круговой дихроизм также напрямую зондирует основные и возбуждённые электронные состояния плёнки, были получены данные, обновляющие расчётные параметры для описания зонной структуры манганитов. В случае плёнок Zn1-xCoxO и Zn1-x-yCoxAlyO установлено, что спектральная форма магнитного кругового дихроизма выступает в качестве инструмента для обнаружения наночастиц Co в матрице твёрдого раствора ZnO:Co и ZnO:(Co+Al).Semiconductor materials based on ZnO and RE3+MnO3 oxides are considered as potential candidates for spintronics. This article presents the methodology and results of studying the effect of magnetic circular dichroism for Zn1-xCoxO, Zn1-x-yCoxAlyO and RE1-x 3+Ax 2+MnO3 film structures in the visible radiation range. It has been shown that the magnetic circular dichroism behavior of the manganite films reflects not only the magnetic, but also the charge component of the material. This indicates the possibility of studying the magnetic and transport characteristics of the films using the magnetic circular dichroism spectroscopy. Since the magnetic circular dichroism effect also directly probes the ground and excited electronic states of the film, it has been obtained data that update calculated parameters for describing the manganites band structure. In the case of the Zn1-xCoxO and Zn1-x-yCoxAlyO films, the magnetic circular dichroism spectroscopy acts as a tool for detecting Co nanoparticles in the solid solution matrix of ZnO:Co and ZnO:(Co+Al).
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Dudnikov V. A., Orlov Yu. S., Vereshchagin S. N., Belov A. A., Solovyov L. A., Borus A. A., Zharkov S. M., Zeer G. M., Ustyuzhanin Yu. N., Volochaev M. N., Bondarev V. S., Ovchinnikov S. G.
Заглавие : Improving of thermoelectric figure of merit in Sr0.925Dy0.075TiO3 ceramics
Колич.характеристики :8 с
Место публикации : Ceram. Int. - 2024. - Vol. 50, Is. 24, Part C. - P.55026-55033. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2024.10.351. - ISSN 18733956 (eISSN)
Примечания : Cited References: 64
Аннотация: Rare earth doped SrTiO3 is one of the most promising oxide materials meeting the safety and stability requirements for potential applications in thermoelectric converters. This work aims to assess the feasibility of engineering SrTiO3-based materials to improve their thermoelectric performance. A comparative analysis of the thermoelectric properties of Sr0.925Dy0.075TiO3 ceramic samples obtained from preliminarily mechanically activated Sr0.925Dy0.075TiO3 nano-powder by two methods – solid-state reaction synthesis and spark plasma sintering – was carried out. Significant differences in the morphology of the samples lead to significant differences in the temperature dependences of electrical resistivity and the Seebeck coefficient. Ceramics obtained by solid-state reaction synthesis exhibit lower porosity and lower electrical resistivity. The thermoelectric power factor of such ceramics is 2–3 times higher than that of samples obtained by spark plasma sintering. The obtained value of thermoelectric figure of merit ZT = 0.41 at T = 673 K for Sr0.925Dy0.075TiO3 is the highest value among n-type oxide thermoelectric ceramics at a given temperature and maintains a tendency to increase with increasing temperature.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Saikova S., Nemkova D., Krolikov A., Pavlikov A., Volochaev M. N., Samoilo A., Ivanenko T., Kuklin A.
Заглавие : Tailoring of ultrasmall NiMnO3 nanoparticles: Optimizing synthesis conditions and solvent effects
Колич.характеристики :17 с
Место публикации : Molecules. - 2024. - Vol. 29, Is. 20: Synthesis and Characterization of Metal Nanoparticles and Metal Oxide Nanoparticles. - Ст.4846. - ISSN 14203049 (eISSN), DOI 10.3390/molecules29204846
Примечания : Cited References: 48. - The Russian team acknowledges the support of the Russian Science Foundation (Project 22-73-10047)
Аннотация: Nickel manganese oxide (NiMnO3) combines magnetic and dielectric properties, making it a promising material for sensor and supercapacitor applications, as well as for catalytic water splitting. The efficiency of its utilization is notably influenced by particle size. In this study, we investigate the influence of thermal treatment parameters on the phase composition of products from alkali co-precipitation of nickel and manganese (II) ions and identify optimal conditions for synthesizing phase-pure nickel manganese oxide. Ultrafine nanoparticles of NiMnO3 (with sizes as small as 2 nm) are obtained via liquid-phase ultrasonic dispersion, exhibiting a narrow size distribution. A systematic exploration of the solvent nature (water, N-methyl-2-pyrrolidone, dimethyl sulfoxide, dimethylformamide) on the efficiency of ultrasonic dispersion of NiMnO3 nanoparticles is provided. It is demonstrated that particle size is influenced not only by absorbed acoustic power, dependent on the physical properties of the used solvent (boiling temperature, gas solubility, viscosity, density) but also by the chemical stability of the solvent under prolonged ultrasonic treatment. Our findings provide insights for designing ultrasonic treatment protocols for nanoparticle dispersions with tailored particle sizes.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkova I. R., Tyryshkina L. E., Volochaev M. N., Zaloga A. N., Shabanova K. A., Ovchinnikov A. V., Lyamkin A. I.
Заглавие : The effect of aluminum-oxide powders on the structure and properties of copper electrodeposited composite coatings
Место публикации : Prot. Met. Phys. Chem. Surf. - 2023. - Vol. 59, Is. 1. - P.71-75. - ISSN 20702051 (ISSN), DOI 10.1134/S2070205122700022. - ISSN 2070206X (eISSN)
Примечания : Cited References: 9
Аннотация: Copper electrodeposited composite coatings containing two types of aluminum-oxide powders with different dispersities (alumina Al2O3-1 and electroexplosive aluminum-oxide nanopowder Al2O3-2) are obtained during the work. The studies show that introducing the powders leads to a change in the microstructure of the composites and a change in the grain growth principles during the formation of the coatings. Refinement and ordering of the grain structure of the coatings occurs and twinning defects and texture are formed. The change in the formation of the microstructure of the composites leads to a change in some operational characteristics: an increase in the microhardness (by 10% in the composites with the addition of alumina and by more than 30% in the coatings with electroexplosive aluminum oxide) and ultimate tensile strength (by 20% in the composites with Al2O3-1 and almost 1.5-fold in the samples with Al2O3-2).
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samoshkina Yu. E., Rautskii M. V., Neznakhin D. S., Stepanova E. A., Edelman I. S., Chou, Hsiung
Заглавие : Particles–matrix bond in ZnCoO:H and ZnCoAlO:H films: Issues of magnetism and spin injection
Место публикации : Materials. - 2023. - Vol. 16, Is. 10. - Ст.3659. - ISSN 19961944 (eISSN), DOI 10.3390/ma16103659
Примечания : Cited References: 45. - This work was supported by the Russian Science Foundation [grant number 21-72-00061]
Аннотация: ZnCoO:H and ZnCoAlO:H films were synthesized by radio frequency magnetron sputtering in a (1 − x)Ar + xH2 mixed atmosphere with x = 0.2–0.5. The films contain different amounts of metallic Co particles (from 7.6% and higher) ~4–7 nm in size. The magnetic and magneto-optical (MO) behavior of the films was analyzed in combination with their structural data. The samples exhibit high values of magnetization (up to 377 emu/cm3) and MO response at room temperature. Two situations are considered: (1) the film magnetism is associated only with isolated metal particles and (2) magnetism is present both in the oxide matrix and in metal inclusions. It has been established that the formation mechanism of the magnetic structure of ZnO:Co2+ is due to the spin-polarized conduction electrons of metal particles and zinc vacancies. It was also found that in the presence of two magnetic components in the films, these components are exchange-coupled. In this case, the exchange coupling generates a high spin polarization of the films. The spin-dependent transport properties of the samples have been studied. A high value of the negative magnetoresistance of the films at room temperature (~4%) was found. This behavior was explained in terms of the giant magnetoresistance model. Thus, the ZnCoO:H and ZnCoAlO:H films with high spin polarization can be considered as sources of spin injection.
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