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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Kovaleva E. A., Sokolov A. Е., Visotin M. A., Lin C. R., Ovchinnikov S. G.
Заглавие : Trimetallic magnetite-Ti-Au nanoparticle formation: A theoretical approach
Место публикации : Mater. Chem. Phys. - 2021. - Vol. 271. - Ст.124847. - ISSN 02540584 (ISSN), DOI 10.1016/j.matchemphys.2021.124847
Примечания : Cited References: 46. - The reported study was funded by Joint Research Project of Russian Foundation for Basic Research # 19-52-52002 and Ministry of Science and Technology, Taiwan MOST # 109-2112-M-153-003 and # 108-2923-M-153-001-MY3
Аннотация: Geometric, electronic and magnetic structure of planar slabs consisting of magnetite Fe3O4, titanium and gold layers are investigated by DFT-GGA calculations. It is assumed that these slabs can be used to simulate the upper layers of magnetite nanoparticles covered with an intermediate layer of titanium and a gold layer on the surface. Specific energies and spreading parameters (wettability) of the magnetite-gold, magnetite-titanium and titanium-gold interfaces are calculated. The specific energy and spreading parameter of the magnetite-gold interface is found to be negative, while these values of the magnetite-titanium (for thin Ti layer) and magnetite-titan-gold interfaces are significantly positive. This allows us to hope that the intermediate thin layer of titanium at the boundary between the surface of the magnetite nanoparticle and the gold layer stabilizes this three-layer structure and allows obtaining magnetite nanoparticles covered with continuous gold coating.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Stolyar S. V., Chekanova L. A., Yaroslavtsev R. N., Bayukov O. A., Velikanov D. A., Volochaev M. N., Eroshenko P. E., Iskhakov R. S.
Заглавие : Square plate shaped magnetite nanocrystals
Место публикации : J. Magn. Magn. Mater. - 2021. - Vol. 527. - Ст.167730. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2021.167730
Примечания : Cited References: 42. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects No. 20-42-240001 and 20-42-242902 and by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1263.2020.3). We are grateful to the Center of collective use of FRC KSC SB RAS for the provided equipment
Аннотация: Square plate shaped magnetite nanocrystals have been synthesized by chemical precipitation from solution using arabinogalactan. A high crystal quality was observed in the plate plane while, across the plate, there is some stratification. The magnetic hysteresis in such particles is determined by the bulk magnetocrystalline anisotropy, plate shape anisotropy, and surface magnetic anisotropy. It is shown using the micromagnetic simulation that the ferromagnetic square nanoplates exhibit the extraordinary magnetization switching anisotropy, which should be taken into account for understanding the hysteretic properties of the particles.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarenko L. S., Kovel E. S., Kydralieva K. A., Dzhardimalieva G. I., Illes E., Tombacz E., Kicheeva A. G., Kudryasheva N. S.
Заглавие : Effects of modified magnetite nanoparticles on bacterial cells and enzyme reactions
Место публикации : Nanomaterials. - 2020. - Vol. 10, Is. 8. - Ст.1499. - P.1-20. - ISSN 20794991 (ISSN), DOI 10.3390/nano10081499
Примечания : Cited References: 83. - This research was funded by the Russian Foundation for Basic Research (#19-315-50048, #19-33-90149, and #18-29-19003)
Аннотация: Current paper presents biological effects of magnetite nanoparticles (MNPs). Analyzing effects of MNP’ characteristics (zeta-potential and hydrodynamic diameters) on bacteria and their enzyme reactions was the main focus. Photobacterium phosphoreum and bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe3O4 modified with 3-aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPs were studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidative activity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as well as higher Fe3+ content in suspensions of Fe3O4/HA. Low-concentration suspensions of bare Fe3O4 provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs with modified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4-benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemical cycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools to evaluate bioavailability of Fe3+ in natural dispersions of iron-containing nanoparticles, e.g., magnetite, ferrihydrite, etc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sokolov A. Е., Ivanova O. S., Fedorov A. S., Kovaleva E. A., Vysotin M. A., Lin, C-R, Ovchinnikov S. G.
Заглавие : Why the magnetite-gold core-shell nanoparticles are not quite good and how to improve them
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-52002]; Ministry of Science and Technology of TaiwanMinistry of Science and Technology, Taiwan [109-2112-M-153-003, 108-2923-M-153-001-MY3]
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 10. - P.1536-1540. - ISSN 1063-7834, DOI 10.1134/S1063783421090365. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 35. - This study was supported by the Russian Foundation for Basic Research, project no. 19-52-52002, and the Ministry of Science and Technology of Taiwan, projects MOST nos. 109-2112-M-153-003 and 108-2923-M-153-001-MY3
Предметные рубрики: IRON-OXIDE NANOPARTICLES
TOTAL-ENERGY CALCULATIONS
STABILITY
DESIGN
Аннотация: The nature of the formation of a chemical bond at the magnetite-gold interface has been studied. The geometric structure and the electronic and magnetic properties of plane layers consisting of magnetite Fe3O4 and gold have been investigated using the DFT-GGA calculation. It has been found that the specific energy and the wetting parameter of the magnetite-gold interface are negative, which leads to the island growth of small Au particles on the Fe3O4 surface. The role of an intermediate thin titanium layer between magnetite and gold has been discussed. The specific energy and wetting parameter of the magnetite-titanium (for thin Ti layers) and magnetite-titanium-gold interfaces are positive. It has been suggested that an intermediate thin titanium layer at the interface between the magnetite nanoparticle surface and the gold layer will make it possible to obtain magnetite nanoparticles with a continuous gold coating.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Feggeler, Thomas, Meckenstock, Ralf, Spoddig, Detlef, Zingsem, Benjamin W., Ohldag, Hendrik, Wende, Heiko, Farle M., Winklhofer, Michael, Ollefs, Katharina J.
Заглавие : Spatially resolved GHz magnetization dynamics of a magnetite nano-particle chain inside a magnetotactic bacterium
Коллективы : Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)German Research Foundation (DFG) [405553726 TRR 270, OL513/1-1, 321560838]; government of the Russian Federation [075-15-2019-1886]; US Department of Energy, Office of Science, Office of Basic Energy SciencesUnited States Department of Energy (DOE) [DE-AC02-76SF00515]
Место публикации : Phys. Rev. Research. - 2021. - Vol. 3, Is. 3. - Ст.033036. - ISSN 2643-1564(eISSN), DOI 10.1103/PhysRevResearch.3.033036
Примечания : Cited References: 40. - This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) -Project No. OL513/1-1, 321560838, and in part by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) -Project-ID 405553726 TRR 270. M.F. acknowledges support by the government of the Russian Federation (agreement No. 075-15-2019-1886). We gratefully acknowledge A. Ney for fruitful discussions. The use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515
Предметные рубрики: AQUASPIRILLUM-MAGNETOTACTICUM
ELECTRON-MICROSCOPY
SP-NOV
Аннотация: Understanding magnonic properties of nonperiodic magnetic nanostructures requires real-space imaging of ferromagnetic resonance modes with spatial resolution well below the optical diffraction limit and sampling rates in the 5-100 GHz range. Here, we demonstrate element-specific scanning transmission x-ray microscopydetected ferromagnetic resonance (STXM-FMR) applied to a chain of dipolarly coupled Fe3O4 nano-particles (40-50 nm particle size) inside a single cell of a magnetotactic bacterium Magnetospirillum magnetotacticum. The ferromagnetic resonance mode of the nano-particle chain driven at 6.748 GHz and probed with 50 nm x-ray focus size was found to have a uniform phase response but non-uniform amplitude response along the chain segments due to the superposition of dipolar coupled modes of chain segments and individual particles, in agreement with micromagnetic simulations.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Sokolov A. Е., Ivanova O. S., Svetlitsky E. S., Petrov D. A., Edelman I. S., Spivakov A. A., Lin C. R.
Заглавие : Surface modification of Magnetite nanoparticles for their applications
Коллективы : International Baltic Conference on Magnetism: focus on nanobiomedicine and smart materials, Балтийский федеральный университет им. И. Канта
Место публикации : 4th International Baltic Conference on Magnetism (IBCM 2021): Book of abstracts. - 2021. - P.197
Примечания : Cited References: 2. - The reported study was funded by RFBR, project number The reported study was funded by Joint Research Project of Russian Foundation for Basic Research # 19-52-52002 and Ministry of Science and Technology, Taiwan MOST # 109-2112-M-153-003 and # 108-2923-M-153-001-MY3.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kirillov V. L., Yakushkin S. S., Balaev D. A., Dubrovskiy A. A., Semenov S. V., Knyazev Yu. V., Bayukov O. A., Velikanov D. A., Yatsenko D. A., Martyanov O. N.
Заглавие : Dimethylsulfoxide as a media for one-stage synthesis of the Fe3O4-based ferrofluids with a controllable size distribution
Место публикации : Mater. Chem. Phys. - 2019. - Vol. 225. - P.292-297. - ISSN 02540584 (ISSN) , DOI 10.1016/j.matchemphys.2019.01.003
Примечания : Cited References: 36. - This work was supported by the Russian Science Foundation , project no. 17-12-01111.
Ключевые слова (''Своб.индексиров.''): ferrofluid--magnetite nanoparticles--one-step synthesis--superparamagnetic nanoparticles--ferromagnetic resonance
Аннотация: The ultrafine (d = 4 nm) magnetite ferrofluid with a narrow nanoparticle size distribution has been synthesized in one stage at room temperature from a solution of iron(II) and (III) chlorides in dimethylsulfoxide (DMSO) with the propylene epoxide admixture. This is the first example of obtaining a stable concentrated ultrafine magnetite/DMSO ferrofluid at room temperature. X-ray diffraction, transmission electron microscopy, ferromagnetic resonance, Mossbauer spectroscopy, and magnetostatic study have been used to elucidate the role of DMSO and the H2O/DMSO ratio in the formation of a stable colloid with a desired nanoparticle size. The initial stages of the magnetite nanoparticles formation have been investigated by the ferromagnetic resonance technique.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ганженко, Игорь Михайлович, Якубайлик, Эдуард Константинович, Зарщикова Г. Г., Камалова Т. Б., Алексеева Л. А.
Заглавие : Снижение засоренности конечного концентрата на Абагурской обогатительной фабрике
Место публикации : Черная металлургия: Бюлл. науч.-тех. и экономич. информации : ЦНИИТЭИ черной металлургии, 2017. - № 3. - С. 39-44. - ISSN 0135-5910
Ключевые слова (''Своб.индексиров.''): обогатительная фабрика--мокрое обогащение--засоренность конечного концентрата--магнетитовое железо--магнитные системы сепараторов--феррит бария--неодим-железо-бор--напряженность магнитного поля--concentration plant--wet concentration--final concentrates dirtiness--magnetite iron--magnetic separator systems--barium ferrite--nd-fe-b composite--magnetic field strength
Аннотация: Приведены результаты изучения засоренности конечного концентрата Абагурской обогатительной фабрики ОАО “Евразруда”. Установлены достижимые границы разделения по содержанию магнетитового железа для сепараторов ПБМ с магнитными системами из композита Nd-Fe-B. Рекомендовано полностью заменить в магнитных системах сепараторов ПБМ феррит бария на композит неодим-железо-бор.The results of the investigation into the dirtiness of the final concentrates at the Abagurskaya Concentration Plant at the OAO “Evrazruda” have been presented. The achievable limits of the separation according to the magnetite iron content in case of the PBM separator with the magnetic systems from the Nd-Fe-B composite have been established. It has been recommended to fully replace the barium ferrite by the Nd-Fe-B composite in the magnetic systems of the PBM separators.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Svetlichnyi V. A., Shabalina A. V., Lapin I. N., Goncharova D. A., Velikanov D. A., Sokolov A. Е.
Заглавие : Characterization and magnetic properties study for magnetite nanoparticles obtained by pulsed laser ablation in water
Место публикации : Appl. Phys. A. - 2017. - Vol. 123, Is. 12. - Ст.763. - ISSN 09478396 (ISSN), DOI 10.1007/s00339-017-1390-7
Примечания : Cited References: 40. - This work was conducted as a government task of the Ministry of Education and Science of the Russian Federation, Project Number 3.9604.2017/8.9.
Ключевые слова (''Своб.индексиров.''): magnetite--pulsed laser ablation--nanoparticles--dispersion
Аннотация: Magnetite (Fe3O4) nanoparticles of 1–10 nm (with the maximum at 2 nm) were obtained via pulsed laser ablation of iron target in water in form of a stable dispersion without addition of surfactants and stabilizers. The structure of the material obtained was investigated using transmission electron microscopy, scanning electron microscopy, and Brunauer–Emmett–Teller methods. To investigate the composition of the particles in the sample, such methods as Fourier transform infrared spectroscopy, Raman spectroscopy, differential scanning calorimetry, and X-ray diffraction, were applied. Magnetite phase was found to be sufficiently pure, it was not contaminated by other iron oxide phases and contained not more than 0.5% of metallic iron in form of large particles. The study of the magnetic properties of the magnetite nanoparticles obtained has shown that they exhibit ferrimagnetic behavior at room temperature with the paramagnetic contribution explained by the presence of fine superparamagnetic particles.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Stolyar S. V., Chekanova L. A., Komogortsev S. V., Yaroslavtsev R. N., Bayukov O. A., Velikanov D. A., Volochaev M. N., Latyshev N. V., Iskhakov R. S.
Заглавие : Synthesis and characterization of plate-like magnetite nanoparticles
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 1. - Ст.C.P13. - P.292-293. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 3. - The reported study was carried out with the financial support of the Russian Foundation for Fundamental Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Territory Fund for Support of Scientific and Technical Activity in the framework of scientific Projects No. 18-43-243003 and No. 18-42-240006. The work is supported by the Special Program of the Ministry of Education and Science of the Russian Federation for the Siberian Federal University
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