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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Andryushchenko T. A., Lyashchenko S. A., Lukyanenko A. V., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Auger electron spectroscopy of the air-exposed (Cr0.5Mn0.5)2GaC MAX film surface
Колич.характеристики :6 с
Место публикации : Tech. Phys. Lett. - 2023. - Vol. 49, Is. 7. - P.59-64. - ISSN 10637850 (ISSN), DOI 10.61011/TPL.2023.07.56448.19430. - ISSN 10906533 (eISSN)
Примечания : Cited References: 16. - This study was supported by a grant from the Russian Science Foundation, project № 21-12-00226 (http://rscf.ru/project/21-12-00226/)
Аннотация: We have analyzed chemical bonding of atmospheric oxygen with chromium and manganese on the epitaxial MAX-phase (Cr0.5Mn0.5)2GaC surface using Auger electron spectroscopy combined with ion etching. It was found that the system has a specific anisotropic oxidation where oxygen atoms bind to chromium and manganese ones more actively at the faces of layered MAX phase crystallites in contrast to the (0001) basal plane. At the same time, the dominance of the Mn–O chemical bonding over Cr–O is observed on the latter.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vladimirova A. V., Murueva A. V., Shershneva A. M., Prudnikova S. V., Shabanov A. V., Shishatskaya E. I.
Заглавие : Biocompatible systems for controlled delivery of antiseptics for topical application
Колич.характеристики :14 с
Место публикации : J. Sib. Fed. Univ. Biol. - 2024. - Vol. 17, Is. 1. - P.19-32. - ISSN 19971389 (ISSN); Журн. СФУ. Биол. - ISSN 23135530 (eISSN)
Примечания : Cited References: 28
Аннотация: Controlled drug delivery is one of the frontier areas of science, which uses an interdisciplinary approach. The delivery systems offer numerous advantages over conventional dosage forms, such as improved efficacy and patient compatibility, reduced toxicity, and ease of use. Such systems often use micro- and nanoparticles as carriers for drugs, the prolonged effect of which is achieved due to the controlled slow release of the encapsulated drug. This study investigated the effects of encapsulation of various antiseptics (brilliant green, miramistin, and furacilin) and the chemical composition of the polymer on the yield, structure, size, drug release kinetics, and antibacterial activity of microparticles produced from resorbable polyesters of microbiological origin, polyhydroxyalkanoates. Microparticles with a 5.6–94.8 μm diameter were produced. The form of the active substance molecule has been found to be the most significant factor affecting the characteristics of polyhydroxyalkanoate microparticles. The surface structure of particles is rather determined by the chemical composition of the polymer, and the release kinetics to the model medium depends on the encapsulated drug. Microparticles based on PHAs loaded with brilliant green and furacilin showed antibacterial effects in S. aureus and E. coli cultures. The study demonstrated that microparticles with antiseptics encapsulated in them have potential as prolonged drug delivery systems and are of interest for further research.Технология контролируемой доставки лекарств является одной из передовых областей науки, включающей междисциплинарный научный подход. Эти системы доставки обладают многочисленными преимуществами по сравнению с обычными лекарственными формами, такими как повышенная эффективность и биосовместимость, сниженная токсичность и простота использования. В таких системах в качестве носителей лекарственных средств часто используют микро- и наночастицы, пролонгированное действие которых достигается за счет контролируемого медленного высвобождения инкапсулированного лекарственного средства. В данном исследовании изучалось влияние включения различных антисептиков (бриллиантовый зелёный, мирамистин и фурацилин), а также химического состава полимера на выход, структуру, размер, кинетику высвобождения лекарственных средств и антибактериальную активность микрочастиц, полученных из резорбируемых полиэфиров микробиологического происхождения, полигидроксиалканоатов. Было получено семейство микрочастиц диаметром 5,6–94,8 мкм. Установлено, что наиболее значимым фактором, влияющим на характеристики микрочастиц полигидроксиалканоатов, является форма молекулы активного вещества. Структура поверхности частиц больше зависит от химического состава полимера, а кинетики выхода в модельную среду – от инкапсулированного лекарства. Микрочастицы на основе ПГА с депонированными бриллиантовым зеленым и фурацилином показали антибактериальное действие в культурах S. aureus и E. coli. Результаты продемонстрировали, что микрочастицы с депонированными антисептиками обладают потенциалом в качестве систем пролонгированной доставки и представляют интерес для дальнейших исследований.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T. G., Golubev A. I., Nemtsev I. V., Lukyanenko A. V., Dudaev A. E., Shishatskaya E. I.
Заглавие : Correction: Volova et al. Laser processing of polymer films fabricated from PHAs differing in their monomer composition. Polymers 2021, 13, 1553
Колич.характеристики :2 с
Место публикации : Polymers. - 2024. - Vol. 16, Is. 8. - Ст.1075. - ISSN 20734360 (eISSN), DOI 10.3390/polym16081075
Примечания : Cited References: 1
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Moshkina E. M., Chernyshev A., Vasil'ev A. D., Maximov N., Aleksandrovsky A. S., Andryushchenko T., Shabanov A. V.
Заглавие : Crystal growth and cation order of Ni3-xCoxB2O6 oxyborates
Колич.характеристики :15 с
Место публикации : CrystEngComm. - 2024. - Article in press. - ISSN 14668033 (eISSN), DOI 10.1039/D4CE00091A
Примечания : Cited References: 28. - The research was funded by Russian Science Foundation and Krasnoyarsk Regional Fund of Science, project № 23-12-20012 (https://rscf.ru/en/project/23-12-20012/)
Аннотация: A series of single crystals of Ni3-xCoxB2O6 compounds with the kotoite structure and with different concentrations of transition metal ions (x = 0; 0,19; 0,6; 0,93; 2) were obtained. The lattice parameters and atomic coordinates were determined using X-ray diffraction. The theoretical calculations using the WIEN2k package predict that nickel ions tend to occupy the 4f crystallographic position, while cobalt ions tend to occupy the 2a crystallographic positions. The study of the diffuse scattering spectra and comparison of the Racah parameters for the compounds Ni3B2O6 and Co2NiB2O6 provides experimental evidence that the nickel ions occupy crystallographic position 4f.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Slyusarenko N. V., Yushina I. D., Slyusareva E. A., Golovkina E. V., Krylova S. N., Vtyurin A. N., Krylov A. S.
Заглавие : Determination of the pore direction in a crystalline metal-organic framework by Raman spectroscopy and periodic calculations based on the electron density functional theory
Колич.характеристики :10 с
Место публикации : Optoelectron. Instrum. Data Process. - 2023. - Vol. 59, Is. 6. - P.693-702. - ISSN 87566990 (ISSN), DOI 10.3103/S8756699023060134. - ISSN 19347944 (eISSN)
Примечания : Cited References: 32. - This work was supported by the Russian Foundation for Basic Research (Russian Center of Scientific Information), project no. 21-52-12018We are grateful to Dr. Irena Senkovska for the presented DUT-8 (Ni, Co) samples
Аннотация: A method for the determination of pore orientation in metal-organic framework structures by polarized Raman spectra is proposed. The method involves sensitivity of the line intensity of Raman scattering to the geometry of propagation in a crystal. The operability of the method is shown by DUT-8 (Ni, Co) crystals. The obtained results are interpreted based on analysis of symmetry and direction of vibrations within periodic calculations of the electron density functional theory. The simultaneous approach allowed us to describe the vibrations and to find the principal crystal orientation collinear to the pore direction. The information on the pore orientation is necessary for problems of adsorption and design of complex multicomponent materials based on metal-organic framework.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shapovalov V. V., Shapovalov V. A., Drokina T. V., Vorotynov A. M., Val'kov V. I.
Заглавие : Distribution of cobalt Co2+ ions in single crystals of spinel Li0.5Ga2.5O4
Колич.характеристики :6 с
Место публикации : Phys. Met. Metallogr. - 2024. - Vol. 125, Is. 1. - P.27-32. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X23602883. - ISSN 15556190 (eISSN)
Примечания : Cited References: 22
Аннотация: The distribution of Co2+ ions over sublattices and structurally nonequivalent positions in the unit cell of the crystal lattice of a single crystal of lithium gallium spinel Li0.5Ga2.5O4 is shown. This distribution determines the properties of both mono- and nanocrystalline substances. The distribution is obtained by a special technology and is manifested in the electron paramagnetic resonance (EPR) spectra. The distribution of Co2+ ions depends on the structural and magnetic nonequivalence. The structural and magnetic nonequivalence causes a multiminimum behavior of the crystal field potential in the unit cells of single crystals at the locations of Co2+ ions. The Co2+ ions are found in complexes with tetrahedral and octahedral oxygen ions. Three types of EPR spectra of Co2+ ions have been found and investigated. The Cotetr2+ spectrum is attributed to the Co2+ ion, which replaces the Ga3+ ion located in a tetrahedral oxygen environment. The spectrum of the Cooct2+ ion located in the crystal field with axial symmetry belongs to the Co2+ ion replacing the Li+ ion located in an octahedral oxygen environment. The spectrum of the Cooct2+ ion located in a low symmetry crystal field belongs to the Co2+ ion replacing the Ga3+ ion located in an octahedral oxygen environment. The nearest cationic environment of the ion creates rhombic distortions due to the different valence numbers of Li+ and Ga3+. The results of studying the angular dependences of the spectra show the presence of four and twelve magnetically nonequivalent positions in the unit cells.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balashov Yu. Yu., Myagkov V. G., Bykova L. E., Volochaev M. N., Zhigalov V. S., Matsynin A. A., Galushka K. A., Bondarenko G. N., Komogortsev S. V.
Заглавие : Features of the course of the solid-state reactions in a Sn/Fe/Cu trilayer film system
Колич.характеристики :5 с
Коллективы : Nanophysics & Nanoelectronics, International Symposium
Место публикации : Tech. Phys. - 2023. - Vol. 68, Is. 7. - P.940-944. - ISSN 10637842 (ISSN), DOI 10.61011/TP.2023.07.56642.73-23. - ISSN 10906525 (eISSN)
Примечания : Cited References: 18
Аннотация: Study of the mechanisms of the solid-state reactions in Sn/Fe/Cu thin films is interesting both from a fundamental point of view and from a view of the importance of emerging intermetallics in the technology of solder joints and thin-film lithium-ion batteries. By the integrated approach, including both X-ray phase analysis and local elemental analysis of the cross-sections of the films, the phase composition and the mutual arrangement of phases were studied, at various stages of the solid-state reaction occurring at different temperatures. The observed sequence of the appearing phases differs significantly from the expected one if the mass transfer took place by a volume diffusion through the forming layers.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gudim I. A., Mikhashenok N. V., Vasiliev A. D., Melnikova S. V., Pavlovskii M. S., Skorobogatov S. A., Pankrats A. I.
Заглавие : Features of the melt–solution synthesis of the TbCr3(BO3)4 single crystals
Колич.характеристики :6 с
Место публикации : J. Cryst. Growth. - 2024. - Vol. 637-638. - Ст.127716. - ISSN 00220248 (ISSN), DOI 10.1016/j.jcrysgro.2024.127716. - ISSN 18735002 (eISSN)
Примечания : Cited References: 22. - The authors thank A.V. Zamkov for assistance in preparing the samples for the conoscopic study. The characterization and examination of the samples were performed at the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of SciencesThis study was supported in part by the Russian Science Foundation and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 22-12-20019
Аннотация: The phase formation of terbium chromoborate TbCr3(BO3)4 in the bismuth trimolybdate and lithium tungstate melt–solutions has been studied. The absence of the terbium chromoborate trigonal phase in the bismuth trimolybdate-based system at all component ratios has been shown. The component ratio in the lithium tungstate-based system has been found at which the TbCr3(BO3)4 trigonal crystals are formed at temperatures above 1100 °C; below this temperature, the monoclinic phase dominates. The structural and magnetic properties of the grown crystals have been studied. It has been established that the trigonal and monoclinic TbCr3(BO3)4 crystals synthesized from the lithium tungstate-based solvent exhibit identical magnetic properties. At the same time, a significant difference of the magnetic properties of the single crystals synthesized from the bismuth molybdate melt–solution has been observed. This difference has been attributed to the effect of Bi3+ ions that partially replace Tb3+ ions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Golosovsky I. V., Mukhin A. A., Skumryev V., Ressouche E., Ivanov V. Yu., Gudim I. A.
Заглавие : Hidden magnetic instability in the substituted multiferroics (Nd, Tb)Fe3(BO3)4
Колич.характеристики :7 с
Место публикации : Phys. Rev. B. - 2024. - Vol. 109, Is. 1. - Ст.014421. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.109.014421. - ISSN 24699969 (eISSN)
Примечания : Cited References: 22. - The authors are grateful to Prof. B. Z. Malkin for fruitful discussions. I.V.G. acknowledges financial support from the Russian Foundation for Basic Research under Grant No. 20-02-00109. A.A.M. and V.Yu.I. acknowledge financial support of the magnetic studies and the developed model from the Russian Science Foundation under Project No. 22-42-05004
Аннотация: In the substituted Nd1–xTbxFe3(BO3)4 (x=0.1 and x=0.2), possessing almost easy-axis magnetic structure at low temperatures, an unusual two-step transition in fields along the trigonal c axis was observed by magnetization and single-crystal neutron diffraction studies. At the first step, only part of the Tb Ising-type moments flip to the c axis, which is accompanied by a significant deviation of the antiferromagnetic Fe spins from the c axis. At the second step, the remaining Tb moments flip and the Fe moments flop into the basal plane. The observed evolution is qualitatively explained by a model assuming small deviations of Tb moments from the trigonal axis due to local environment distortions, which leads to nonequivalence of the Tb ions with respect to effective Tb-Fe exchange and external field. Thus, an intrinsic “hidden” instability of the magnetic system in the magnetic field occurs.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Glazkova D. A., Estyunin D. A., Tarasov A. S., Kosyrev N. N., Komarov V. A., Patrin G. S., Golyashov V. A., Tereshchenko O. E., Kokh K. A., Koroleva A. V., Shikin A. M.
Заглавие : Investigation of surface magnetism in systems based on MnBi2Te4 using the magneto-optical Kerr effect
Колич.характеристики :6 с
Место публикации : Crystallogr. Rep. - 2024. - Vol. 69, Is. 1. - P.79-84. - ISSN 10637745 (ISSN), DOI 10.1134/S1063774523601296. - ISSN 1562689X (eISSN)
Примечания : Cited References: 39. - This study was supported by the St. Petersburg State University (project no. 94031444) and the Russian Science Foundation (grant no. 23-12-00016). The samples were synthesized within the project "State Assignment for the Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the Russian Academy of Sciences and the Rzhanov Institute of Semiconductor Physics of the Siberian Branch of the Russian Academy of Sciences"
Аннотация: MnBi2Te4, Mn(Bi,Sb)2Te4, and MnBi2Te4(Bi2Te3)m (m ≥ 1) are assigned to magnetic topological insulators. Successful application of these materials in nanoelectronic devices calls for comprehensive investigation of their electronic structure and magnetic properties in dependence of the Bi/Sb atomic ratio and the number m of Bi2Te3 blocks. The magnetic properties of the surface of MnBi2Te4, MnBi4Te7, and Mn(Bi1-xSbx)2Te4 compounds (x = 0.43 and 0.32) have been studied using the magneto-optical Kerr effect. It is shown that the temperatures of magnetic transitions on the surface and in the bulk of MnBi4Te7 and Mn(Bi, Sb)2Te4 differ significantly.
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