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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N.V., Eremin E.V., Patrin G.S., Kim P.D.
Заглавие : Magnetic tunnel junction in the current-in-plane geometry: Magnetoresistance; photovoltaic effect
Место публикации : Rare Metals. - 2009. - Vol. 28, Spec. Issue. - С. 170-173
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Drokina T. V., Petrakovskii G. A., Keller L., Schefer J., Ivanov D.
Заглавие : Magnetic structure and properties of py?roxene NaFeGe2O6
Место публикации : Rare Metals. - 2009. - Vol. 28. - С. 398-400
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pasynkova A. A., Lepalovskii V. N., Svalov A. V., Volochaev M. N., Kurlyandskaya G. V.
Заглавие : Magnetic properties and peculiarities of the domain structure of multilayer permalloy-based GMI elements
Место публикации : Phys. Met. Metallogr. - 2022. - Vol. 123, Is. 7. - P.715-720. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X22070146
Примечания : Cited References: 17. - The studies were performed in terms of a state assignment of the Ministry of Science and Higher Education of the Russian Federation, no. FEUZ-2020-0051
Аннотация: Magnetic properties and peculiarities of the domain structure of multilayer [Ti/FeNi]х/Cu/[FeNi/Ti]x elements, the geometry of which ensures the high magnetoimpedance effect, are studied by varying the number of layers in the range x = 0–5. Peculiarities of the magnetization processes of the multilayer structures, which are magnetized at both substrate and free surfaces, are analyzed. It has been found that elements in which the magnetization reversal from the free side occurs by rotation of the magnetization vector have a higher magnetoimpedance effect compared to elements in which the magnetization reversal occurs with the formation of 180° domain walls both in the layer from the side of the substrate and the free layer as well.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Chekanova L. A., Cheremiskina E. V., Yaroslavtsev R. N., Taran O. P., Borovkova V. S., Malyar Y. N., Neznakhin D. S., Komogortsev S. V.
Заглавие : Synthesis of transition metal coatings using arabinogalactan
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2022. - Vol. 86, Is. 5. - P.597-600. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873822050264
Примечания : Cited References: 19. - The study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Regional Science Foundation (project no. 20-43-240003)
Аннотация: Carbon-containing transition metal (Fe, Co, Ni) coatings are synthesized via chemical deposition with arabinogalactan. The crystal structure and chemical composition of the coatings are determined. Data from magnetometry and X-ray diffraction show that carbon is not included in the crystal lattice of a metal. Instead, it exists in the form of graphite inclusions. Degradation of arabinogalactan in an alkaline medium on the surface of a galvanic pair is investigated.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Antonova A.B., Chudin O.S., Pavlenko N.I., Sokolenko W.A., Rubaylo A.I., Vasiliev A. D., Verpekin V.V., Semeikin O.V.
Заглавие : Chemistry of vinylidene complexes
Место публикации : Russ. Chem. Bull. - NEW YORK: SPRINGER, 2009. - Vol. 58, Is. 5. - С. 955-963. - MAY. - ISSN 1066-5285, DOI 10.1007/s11172-009-0122-3
Примечания : Cited Reference Count: 35. - Гранты: This work was financially supported by the Krasnoyarsk Regional Science Foundation (Grants Nos. 10TS145 and 17G002), the Council on Grants at the President of the Russian Federation (Program for State Support of Leading Scientific Schools, Grant NSh-4137.2006.2), and the Presidium of the Russian Academy of Sciences (Program for Basic Research, Project No. 18.18).Финансирующая организация: Krasnoyarsk Regional Science Foundation [10TS145, 17G002]; Council on Grants at the President of the Russian Federation [NSh-4137.2006.2]; Presidium of the Russian Academy of Sciences [18.18]
Предметные рубрики: RAY CRYSTAL-STRUCTURE
MOLECULAR-STRUCTURE
PHENYLVINYLIDENE LIGANDS
BRIDGED COMPLEXES
TRANSITION-METALS
CARBONYL LIGAND
BINUCLEAR
DERIVATIVES
DINUCLEAR
RHENIUM
Ключевые слова (''Своб.индексиров.''): vinylidene complexes--heterometallic complexes--manganese--rhenium--palladium--platinum--ir and nmr spectroscopy--x-ray diffraction study--heterometallic complexes--ir and nmr spectroscopy--manganese--palladium--platinum--rhenium--vinylidene complexes--x-ray diffraction study
Аннотация: The reactions of Cp(CO)(2)Re=C=CHPh (2) with M(PPh(3))(4) (M = Pd, Pt) gave the mu-vinylidene complexes Cp(CO)(2)RePd(mu-C=CHPh)(PPh(3))(2) (3) and Cp(CO)(2)RePt(mu-C=CHPh)(PPh(3))(2) (1), respectively. The substitution of Ph(2)PCH(2)PPh(2) (dppm) for the PPh(3) ligands in 1 resulted in the formation of Cp(CO)RePt(mu-C(1)=C(2)HPh)(mu-CO)(dppm) (4). The structure of complex 4 has been determined by single-crystal X-ray diffraction analysis. The structural and spectroscopic characteristics of complexes 1, 3, and 4 were compared with the corresponding parameters of the manganese-containing analogs Cp(CO)(2)MnPd(mu-C=CHPh)(PPh(3))(2) (5), Cp(CO)(2)MnPt(mu-C=CHPh)(PPh(3))(2) (6) and Cp(CO)(2)MnPt(mu-C=CHPh)(dppm) (7).
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Chzhan A.V., Patrin G.S., Isaeva I.N.
Заглавие : Photo-induced Relaxation Self-Oscillations of Stripe Structures in FeBO(3)
Место публикации : DEFECTS AND DIFFUSION IN METALS: AN ANNUAL RETROSPECTIVE XI. - STAFA-ZURICH: TRANS TECH PUBLICATIONS LTD, 2009. - Vol. 293. - С. 115-119. - (Defect and Diffusion Forum Series). - ISBN 1012-0386
Примечания : Cited Reference Count: 6
Ключевые слова (''Своб.индексиров.''): impurity centers--induced magnetic anisotropy--iron borate--relaxation
Аннотация: Photo-induced self-oscillations of stripe structures are studied in FeBO(3) crystals at low temperatures. Experimental data show that the observed oscillations have a relaxational character. On the basis of the research carried out, a model for such oscillations is presented.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Карпов, Сергей Васильевич, Исаев, Иван Леонидович
Заглавие : Молекулярно-динамические исследования условий проявления фотостимулированного структурообразования в наноразмерных аэрозолях металлов
Место публикации : Инженерная физика. - Москва: Общество с ограниченной ответственностью Издательство Научтехлитиздат, 2009. - № 3. - С. 38-41. - ISSN 2072-9995
Ключевые слова (''Своб.индексиров.''): nanoparticles--aerosols of metals--photoaggregation--наночастицы--аэрозоли металлов--фотоагрегация
Аннотация: С помощью метода молекулярной динамики обнаружено проявление фотостимулированного взаимного разнополярного заряжения наночастиц аэрозоля (на примере серебра) и ускорение его агрегации под действием возникающих электростатических сил на два порядка, по сравнению со скоростью спонтанной агрегации в отсутствие света. Обнаружено, что фотоагрегация протекает при следующих условиях: электронном фотоэффекте из наночастиц и их полидисперсности, электронной проводимости межчастичной среды и отсутствия в ней, помимо фотоэлектронов, свободных электрических зарядов.By the method of molecular dynamics found out the display of the photo-enhanced mutual heteropolar loading of nanoparticles of aerosol (on the example of silver) and acceleration of its aggregation under the influence of arising electrostatic forces on two order, in comparison with speed of spontaneous aggregation for lack of light is revealed. It is discovered that photoaggregation flows at the followings terms: electronic photoeffect from nanoparticles and their polydispersion, electronic conductivity of the interpartial environment and absence in it, besides photoelectrons, free electric charges.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Гаврилюк, Анатолий Петрович, Исаев, Иван Леонидович, Карпов, Сергей Васильевич, Герасимов, Валерий Сергеевич
Заглавие : Электронный туннельный эффект и особенности кристаллизации наноразмерных золей металлов
Место публикации : Инженерная физика. - Москва: Общество с ограниченной ответственностью Издательство Научтехлитиздат, 2009. - № 2. - С. 51-53. - ISSN 2072-9995
Предметные рубрики:
Ключевые слова (''Своб.индексиров.''): nano particles--наночастицы--tunnel effect--bimodal bands--туннельный эффект--бимодальный ансамбль
Аннотация: Исследуются закономерности самоорганизации бимодальных ансамблей наночастиц в кристаллические структуры в лиозолях металлов (на примере органозолей золота) методом броуновской динамики. Показана возможность селективной коагуляции разно-размерных частиц вследствие асимметрии встречных туннельных электронных потоков межу частицами разных размеров и их взаимного разнополярного заряжения; исследуется кинетика этого процесса.Explored conformity to the law organizations of bimodal bands of nano particles in crystalline structures in liozole metals (for example of organozole gold) by the method of brownian dynamics. Possibility of selective coagulation of particles of different-sizes is shown because of asymmetry of meetings tunnel electronic streams boundary path by the particles of different sizes and their mutual different arctic loading; explored kinetics of this process.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Гаврилюк А.П., Исаев И.Л., Карпов С.В., Герасимов, Валерий Сергеевич
Заглавие : Электростатические взаимодействия наночастиц с двойным электрическим слоем в золях металлов: исследования методом броуновской динамики
Место публикации : Инженерная физика. - Москва: Общество с ограниченной ответственностью Издательство Научтехлитиздат, 2008. - № 6. - С. 14-17. - ISSN 2072-9995
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Аннотация: Методом численного моделирования решается важная методическая задача, состоящая в проверке степени адекватности классической теории Дерягина-Ландау-Фервея-Овербека (ДЛФО) электростатического взаимодействия двух наночастиц в лиозолях металлов. Исследуется зависимость от межчастичного расстояния энергии электростатического взаимодействия двух контактирующих наночастиц с перекрывающимися двойными электрическими слоями, образованным ионами электролита, в процессе контакта этих слоев. Проводится сравнение результатов с полученными с помощью теории ДЛФО.An important methodical task, co-standing in verification of degree of adequacy of classic theory of Deryagina-Landau-Ferveya-Overbeka (DLFO) of electrostatic co-operation of two nano particles in liozol of metals, decides in working as the method of numeral design. Dependence is explored on interpartial distance of energy of electrostatic co-operation of two contacting nano particles with the blocked double electric layers, formed the ions of electrolyte, in the process of contact of these layers. A comparison of results with DLFO got by a theory is made.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Гаврилюк А.П., Исаев, Иван Леонидович, Карпов, Сергей Васильевич, Герасимов, Валерий Сергеевич
Заглавие : Применение метода броуновской динамики для исследования формирования двойного электрического слоя наночастиц в гидрозолях металлов
Место публикации : Инженерная физика. - Москва: Общество с ограниченной ответственностью Издательство Научтехлитиздат, 2008. - № 4. - С. 70-72. - ISSN 2072-9995
Предметные рубрики:
Аннотация: Впервые методом броуновской динамики исследуется образование двойного электрического слоя наночастиц гидрозолей металлов при адсорбции ионов электролита из окружающей среды с целью сопоставления с классическими теориями Штерна, Гуи-Чэпмена, Гельмгольца. При этом исследуется влияние на структуру слоя кулоновских сил, включая и силы изображения, ван-дер-ваальсовых, диссипативных и случайных сил, а также степени гидратации адсорбируемых ионов. Полученные результаты позволяют уточнить форму потенциала межчастичного взаимодействия в данном типе золей - одного из фундаментальных параметров, определяющих процесс структурообразования в дисперсных системах с электростатическим механизмом стабилизации.For the first time the method of Brown dynamics investigates formation of a double electric layer nanoparticles hidrozole metals at adsorption of ions of electrolit from an environment with the purpose of comparison to Stern's, Gui-Chepmen's and Gelmgolt's theories. Thus influence on structure of a layer Kulon's forsec, including and forces of the image, Van der Vals's, and casual forces, and also a degree of hydration of adsorbed ions is investigated. The received results allow to specify the form of potential of interpartial interaction in the given type ofzole - one of the fundamental parameters defining process of structurization in disperse systems with the electrostatic mechanism of stabilization.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Eftifeeva, Anna S., Panchenko, Elena Y., Fatkullin, Ilya D., Volochaev M. N., Tagiltsev, Anton I., Chumlyakov, Yuriy I.
Заглавие : The cyclic stability of superelasticity in aged Ti49.3Ni50.7 single crystals with oxide surface
Место публикации : Metals. - 2022. - Vol. 12, Is. 12. - Ст.2113. - ISSN 20754701 (eISSN), DOI 10.3390/met12122113
Примечания : Cited References: 30. - This research was funded by grant under the Decree of the Government of the Russian Federation No. 220 of 9 April 2010 (Agreement No. 075-15-2021-612 of 4 June 2021)
Аннотация: The cyclic stability of superelasticity in compression in [001]B2-oriented Ti49.3Ni50.7 single crystals is considered in this paper. The crystals were aged at 823 K for 1.0 h in air and helium. It has been experimentally shown that a two-layered surface thin film, consisting of a Ni-free oxide layer and a Ni-rich sublayer, appears after the oxidation at 823 K in air. The surface layers have a weak effect on the forward B2-R-B19’ martensitic transformation temperatures: TR temperature increases by 4 K; Ms and Mf temperatures decrease by 6 K. The oxide layer does not affect either the superelasticity response during fatigue tests or the temperatures of reverse B19’-B2 martensitic transformation. The cracking of the surface oxide layer during fatigue tests was not found in [001]B2-oriented single crystals aged in air. This is contributed by the relaxation of internal stresses. Such internal stresses are caused by both the formation of an oxide layer during aging and the matrix deformation at the stress-induced martensitic transformation. The main relaxation mechanisms of the internal stresses are the oriented growth of Ti3Ni4 precipitation near a thin surface film at aging in air, the formation of dislocations near the precipitation-matrix interface and a fine twinned B19’-martensite at fatigue tests.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Гаврилюк А. П., Исаев, Иван Леонидович, Карпов, Сергей Васильевич, Герасимов, Валерий Сергеевич
Заглавие : Фотостимулированная агрегация электростатически стабилизированных гидрозолей металлов
Место публикации : Инженерная физика. - Москва: Научтехлитиздат, 2008. - № 6. - С. 18-19. - ISSN 2072-9995
Предметные рубрики:
Аннотация: В работе впервые предложено объяснение причин ускорения (до 105 раз) агрегации электростатически стабилизированных гидрозолей металлов под действием оптического излучения в условиях проявления электронного фотоэффекта. Явление объясняется изменением структуры диффузной частиц двойного электрического слоя в процессе электронной фотоэмиссии из металлического ядра наночастиц и снижением фактора агрегативной устойчивости.In work, explaining reasons of acceleration (to 105 times) of agregation of electrostatic of the stabilized hidrozole metals is first offered under the action of optical radiation in the conditions of display of electronic photoeffect. The phenomenon is explained the change of structure diffuse particles of double electric layer in the process of electronic photoemission from the metal kernel of nanoparticles and by the decline of factor of aggregate stability.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sinyakova E. F., Vasilyeva I. G., Oreshonkov A. S., Goryainov S. V., Karmanov N. S.
Заглавие : Formation of noble metal phases (Pt, Pd, Rh, Ru, Ir, Au, Ag) in the process of fractional crystallization of the CuFeS2 melt
Место публикации : Minerals. - 2022. - Vol. 12, Is. 9. - Ст.1136. - ISSN 2075163X (ISSN), DOI 10.3390/min12091136
Примечания : Cited References: 61. - This work was supported by the Russian Federation state assignment of Sobolev Institute of Geology and Mineralogy of SB RAS, Nikolaev Institute of Inorganic Chemistry SB RAS, and Kirensky Institute of Physics of Federal Research Center KSC SB RAS. The grant number is projects II.1.64. and 40330-2016-0001
Аннотация: The quasi-equilibrium directional crystallization of the melt composition (at. %): Cu 24.998, Fe 25.001, S 49.983, with Ag 0.002, Pd 0.003, Ru 0.004, Rh 0.006, and Au, Pt, Ir (each as 0.001) was carried out. The crystallized cylindrical ingot consisted of two primary zones and three secondary zones with different chemical and phase compositions. The compositions of the primary zones corresponded to high-temperature intermediate solid solution (zone I) and liquid enriched in sulfur (zone II). The compositions of the secondary zones corresponded to low-temperature intermediate solid solution and chalcopyrite (zone Ia), the same intermediate solid solution with chalcopyrite and bornite (zone Ib), and again with bornite, chalcocite, and idaite (zone II). We plotted the distribution curves of Fe, Cu, and S along the ingot, calculated the distribution coefficients of the components during directional crystallization, and clearly showed that, from the initial stoichiometric composition CuFeS2, the intermediate solid solution enriched in Fe and depleted in S is crystallized. Based on the data of directional crystallization and thermal analysis, a cross section was constructed in the intermediate solid solution-sulfide melt region of the Cu-Fe-S system. With solubility in the solid Cu-Fe sulfides lying below detection limit of scanning electron microscopy/energy-dispersive X-ray spectrometry (SEM/EDS), noble elements occurred as individual phases of a size more often <10 µm. They were identified as Ag, RuS2, PdS, Au* (an Au based alloy), (Rh, Ir, Ru)3S8, (Rh, Ir)3S8, Rh3S8, and (Cu, Fe)~2(Pt, Rh)1S~5 phases by electron microprobe. Based on ab initio calculations of crystal structure, electronic band structure, and lattice dynamics of idealized laurite RuS2 phase and the idealized Ir3S8, Rh3S8, and Ru3S8 phases, the interpretation of Raman spectrum of the cation-mixed (Ru, Rh, Ir)S2 sulfide was presented for the first time.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Polukeev S. I., Gavrichkov V. A., Ovchinnikov S. G.
Заглавие : The ratio of the 90° and 180° exchange contributions in monoxides NiO and CoO at normal and high pressure
Место публикации : Phys. Met. Metallogr. - 2022. - Vol. 123, Is. 7. - P.645-650. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X22070158
Примечания : Cited References: 20. - This study was supported by the Russian Science Foundation, project no. 18-12-00022
Аннотация: The 90° and 180° super-exchange interaction in the Mott–Hubbard dielectrics NiO and CoO under normal conditions and at high hydrostatic pressure, which leads to spin crossover on magnetic ions, is estimated. It is shown that the magnetic ordering in these materials is completely determined by the 180° super exchange in the second coordination shell.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A. S., Zaitsev A. I., Shakhura I. E. , Zamkov A. V., Vyunishev A. M.
Заглавие : Random quasi-phase-matching in a nonlinear photonic crystal structure of strontium tetraborate
Место публикации : Phys. Rev. A. - 2008. - Vol. 78, Is. 3. - Ст.031802. - ISSN 1050-2947, DOI 10.1103/PhysRevA.78.031802
Примечания : Cited Reference Count: 20. - Гранты: This work was supported by RFBR Grant No. 02-0700497, Grants of the President of the Russian Federation for the support of leading scientific schools (No. SS-1011.2008.2 and No. SS-3818.2008.3), Grant No. RNP.2.1.1.1814, and the Interdisciplinary Integration project of SB RAS 33.Финансирующая организация: RFBR [02-0700497]; Russian Federation [SS-1011.2008.2, SS-3818.2008.3, RNP.2.1.1.1814]; SB RAS 33
Предметные рубрики: HARMONIC-GENERATION
DOMAIN-STRUCTURE
Ключевые слова (''Своб.индексиров.''): alkaline earth metals--crystal atomic structure--experiments--harmonic generation--photonic crystals--powders--random processes--strontium--angular dependences--enhancement factors--near ultraviolet--photonic crystal structures--quasi phase-matching--second-harmonic generation--spectral dependences--tetra borate--crystal structure
Аннотация: Random quasi-phase-matching (RQPM) of the second-harmonic generation process is investigated experimentally and theoretically in a strongly randomized spontaneously grown nonlinear photonic crystal structure of strontium tetraborate. The thickness of domains in the structure is measured and employed in calculations of angular and spectral dependences of random quasi-phase-matching. Despite the great scale of randomness, the RQPM effect is preserved. The calculated enhancement factor due to RQPM is in excellent agreement with experiment, and good agreement between calculations and experiment is obtained for the shape of the angular dependence of RQPM. The calculated spectral dependence of RQPM consists of a number of narrow peaks, and a maximum enhancement factor is attained in the near ultraviolet. The band structure of randomized nonlinear photonic crystal is calculated.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tomilin F. N., Shubin A. A., Kozak V. V., Ivanova D. A., Fedorova N. A., Ol’shevskaya Y. S., Kovaleva A. V., Avramov P. V., Ovchinnikov S. G.
Заглавие : Effect of substitution on magnetic moments of iron and chromium atoms in MAX phases of type (Cr4 – xFex)0.5SiC: Theoretical calculation
Место публикации : Phys. Met. Metallogr. - 2022. - Vol. 123, Is. 7. - P.640-644. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X22070195
Примечания : Cited References: 25. - The study is supported by the Russian Science Foundation (project no. 21-12-00226) and by the Interagency Supercomputer Center of the Russian Academy of Sciences (MVS-100K and MVS-10P)
Аннотация: MAX phases are a family of ternary layered compounds with formal stoichiometry M2AX and have a layered hexagonal structure. Calculations with the B3LYP density functional show that, by varying the ratio between the chromium and iron in the MAX phase (Cr4 – xFex)0.5SiC, it is possible to change the lattice parameters and the magnetic moment on metal atoms. In this phase, a partial substitution of one metal for the other can be considered a technique of intended variation of their magnetic properties.
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17.

Вид документа : Статья из журнала
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Автор(ы) : Gokhfeld D. M., Koblischka M. R., Koblischka-Veneva A.
Заглавие : Highly Porous Superconductors: Synthesis, Research, and Prospects
Место публикации : Phys. Metals Metallogr. - 2020. - Vol. 121, Is. 10. - P.936-948. - ISSN 0031-918X, DOI 10.1134/S0031918X20100051. - ISSN 1555-6190(eISSN)
Примечания : Cited References: 146
Предметные рубрики: HIGH-T-C
CRITICAL-CURRENT DENSITY
HIGH-TEMPERATURE SUPERCONDUCTORS
Аннотация: This paper presents a review of studies of superconductors with a porosity above 50%. The pores in such superconducting materials allow refrigerant penetration and provide efficient heat dissipation and stable operation. Methods for the synthesis of the main groups of porous superconductors are described. The results of studies of the structural, magnetic, and electrical transport properties are presented, and the features of the current flow through porous superconductors of various types are considered. The directions of further development and application of porous superconductors are presented.
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18.

Вид документа : Статья из журнала
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Автор(ы) : Saykova, Diana, Saikova, Svetlana, Mikhlin, Yuri, Panteleeva, Marina, Ivantsov R. D., Belova E.
Заглавие : Synthesis and characterization of core-shell magnetic nanoparticles NiFe2O4@Au
Место публикации : Metals. - 2020. - Vol. 10, Is. 8. - Ст.1075. - ISSN 2075-4701(eISSN), DOI 10.3390/met10081075
Примечания : Cited References: 45
Предметные рубрики: NICKEL FERRITE NANOPARTICLES
GOLD NANOPARTICLES
OXIDATION
REDUCTION
Аннотация: In this study, NiFe2O4@Au core–shell nanoparticles were prepared by the direct reduction of gold on the magnetic surface using amino acid methionine as a reducer and a stabilizing agent simultaneously. The obtained nanoparticles after three steps of gold deposition had an average size of about 120 nm. The analysis of particles was performed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy techniques. The results indicate successful synthesis of core–shell particles with the magnetic core, which consists of a few agglomerated nickel ferrite crystals with an average size 25.2 ± 2.0 nm, and the thick gold shell consists of fused Au0 nanoparticles (NPs). Magnetic properties of the obtained nanoparticles were examined with magnetic circular dichroism. It was shown that the magnetic behavior of NiFe2O4@Au NPs is typical for superparamagnetic NPs and corresponds to that for NiFe2O4 NPs without a gold shell. The results indicate the successful synthesis of core–shell particles with the magnetic nickel ferrite core and thick gold shell, and open the potential for the application of the investigated hybrid nanoparticles in hyperthermia, targeted drug delivery, magnetic resonance imaging, or cell separation. The developed synthesis strategy can be extended to other metal ferrites and iron oxides.
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19.

Вид документа : Статья из журнала
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Автор(ы) : Saikova S., Pavlikov A., Trofimova T., Mikhlin Y., Karpov D., Asanova A., Grigoriev Y., Volochaev M. N., Samoilo A., Zharkov S. M., Velikanov D. A.
Заглавие : Hybrid nanoparticles based on cobalt ferrite and gold: Preparation and characterization
Место публикации : Metals. - 2021. - Vol. 11, Is. 5. - Ст.705. - ISSN 20754701 (ISSN), DOI 10.3390/met11050705
Примечания : Cited References: 74
Аннотация: During the past few decades, hybrid nanoparticles (HNPs) based on a magnetic material and gold have attracted interest for applications in catalysis, diagnostics and nanomedicine. In this paper, magnetic CoFe2O4/Au HNPs with an average particle size of 20 nm, decorated with 2 nm gold clusters, were prepared using methionine as a reducer and an anchor between CoFe2O4 and gold. The methionine was used to grow the Au clusters to a solid gold shell (up to 10 gold deposition cycles). The obtained nanoparticles (NPs) were studied by X-Ray diffraction (XRD), transmis-sion electron microscopy (TEM), Fourier-transform infrared (FT-IR) spectroscopy, X-Ray photoelectron spectroscopy (XPS) and UV-vis spectroscopy techniques. The TEM images of the obtained HNPs showed that the surface of cobalt ferrite was covered with gold nanoclusters, the size of which slightly increased with an increase in the number of gold deposition cycles (from 2.12 ± 0.15 nm after 1 cycle to 2.46 ± 0.13 nm after 10 cycles). The density of the Au clusters on the cobalt ferrite surface insignificantly decreased during repeated stages of gold deposition: 21.4 ± 2.7 Au NPs/CoFe2O4 NP after 1 cycle, 19.0 ± 1.2 after 6 cycles and 18.0 ± 1.4 after 10 cycles. The magnetic measurements showed that the obtained HNPs possessed typical ferrimagnetic behavior, which corresponds to that of CoFe2O4 nanoparticles. The toxicity evaluation of the synthesized HNPs on Chlorella vulgaris indicated that they can be applied to biomedical applications such as magnetic hyperthermia, photothermal therapy, drug delivery, bioimaging and biosensing.
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20.

Вид документа : Статья из журнала
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Автор(ы) : Orlov V. A., Prokopenko V. S., Rudenko R. Y., Orlova I. N.
Заглавие : Effect of mechanical stress on structure of magnetization of three-layer nanosized disks
Место публикации : Phys. Met. Metallogr. - 2020. - Vol. 121, Is. 11. - P.1039-1044. - ISSN 0031918X (ISSN), DOI 10.1134/S0031918X20100075
Примечания : Cited References: 38. - The research was funded by the Russian Foundation for Basic Research (RFBR), i.e., theoretical and numerical calculations by project No. 18-02-00161 and experimental study by project no. 20-02-00696
Аннотация: The contribution of magnetoelastic effects to the effective magnetic anisotropy of a three-layer film nanodisk (nonmagnetic metal/ferromagnet/nonmagnetic metal) was studied. The mechanical stresses at the lateral surface of the disk that are caused by two factors, i.e., unequal thermal expansion of layers and excess surface energy at the layers interfaces, were estimated. The case in which the contribution of magnetoelastic effects to the anisotropy is comparable with those of shape and crystalline anisotropies was discussed. It was shown that the main reason for the change in the local anisotropy field in the vicinity of a nanodisk edge was the mechanical stresses induced by the excess surface energy. The possible application of film nanodisks of nickel with a bilateral golden coating as “nanolancets” for noninvasive cell surgery of tumors was discussed.
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