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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 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) : 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 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 сборника (однотомник)
Шифр издания :
Автор(ы) : Edel’man I.S.
Заглавие : Magneto-optics of ferromagnetic metals nanoparticles fabricated by ion implantation in dielectric matrix
Коллективы : "Functional Materials", International Conference, "Функциональные материалы", Международная конференция
Место публикации : International Conference "Functional Materials" (ICFM-2011): Book of abstracts. - 2011. - С. 58
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Цыганова, Светлана Ивановна, Патрушев В. В., Бондаренко Г. Н., Великанов, Дмитрий Анатольевич
Заглавие : Формирование магнитных углеродных сорбентов на основе модифицированной древесины
Место публикации : Журнал Сибирского федерального университета. Серия: Химия. - Красноярск: Федеральное государственное автономное образовательное учреждение высшего образования Сибирский федеральный университет, 2011. - Т. 4, № 4. - С. 369-376. - ISSN 1998-2836
УДК : 661.183.2, 620.181.4
Предметные рубрики:
Ключевые слова (''Своб.индексиров.''): metal-carbon sorbent--chemical activation--carbonization--magnetic properties--sorption--noble metals--металл-углеродный сорбент--химическая активация--карбонизация--магнитные свойства--сорбция--благородные металлы
Аннотация: Изучен процесс получения пористых металл-углеродных композитов из древесных отходов, модифицированных хлоридами железа и цинка. Показано, что в процессе карбонизации модифицированных образцов до 400 °С образуется кристаллическая фаза магнетита типа (Zn0,29 Fe0,71)Fe2O4; рост температуры до 800 °С приводит к образованию магнетита и маггемита, не содержащих цинк. Обнаружено, что сорбционная емкость синтезированных образцов выше в сравнении с сорбционной емкостью промышленного углеродного сорбента при сорбции золота, платины и палладия из хлоридных растворов.The process of porous metal-carbon composites synthesis from waste wood modified with chlorides of iron and zinc was studied. It was shown that a crystalline phase of magnetite type (Zn0,29 Fe0,71) Fe2O4 forms in solid product for carbonization of the starting composite up to 400 °C; increase of temperature up to 800 °C leads to the formation of magnetite and maghemite not containing zinc. It was found that the sorption capacity of the synthesized samples is higher in comparison with the sorption capacity of industrial carbon sorbent for extraction of gold, platinum and palladium from chloride solutions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fokina V. D., Gorev M. V., Kocharova A. G., Flerov I. N., Pogoreltsev E.I.
Заглавие : Phase transitions and thermodynamic properties of (NH4)(3)VO2F4 cryolite
Место публикации : Solid State Sci. - 2009. - Vol. 11, Is. 4. - P.836-840. - ISSN 1293-2558, DOI 10.1016/j.solidstatesciences.2008.11.004
Примечания : Cited Reference Count: 17. - Гранты: The authors are grateful to Dr. SM. Mel'nikova for the permission to use the unpublished results.; This work was supported by the Russian Foundation for Basic Research (project 06-02-16102).Финансирующая организация: Russian Foundation for Basic Research [06-02-16102]
Предметные рубрики: PEROVSKITE-LIKE OXYFLUORIDES
(NH4)(3)TIOF5
CS
(NH4)(3)WO3F3
DIFFRACTION
(NH4)3VO2F4
ELPASOLITE
METALS
RB
Ключевые слова (''Своб.индексиров.''): oxyfluorides--phase transition--calorimetry--phase diagram--ferroelectricity--calorimetry--ferroelectricity--oxyfluorides--phase diagram--phase transition--calorimetry--ferroelectricity--halide minerals--phase diagrams--sugar (sucrose)--thermodynamic properties--calorimetric measurements--cubic phase--first-order phase transitions--heat capacities--oxyfluorides--phase transition temperatures--pressure dependences--structural transformations--temperature ranges--phase transitions
Аннотация: Calorimetric measurements performed in a wide temperature range on (NH4)(3)VO2F4 have shown the presence of four heat capacity anomalies at T-1 = 438 K, T-2 = 244 K, T-3 = 210.2 K, T-4 = 205.1 K associated with the first order phase transitions. In accordance with the permittivity behavior, the structural transformations are of nonferroelectric nature. Pressure dependence of the phase transition temperatures has been studied by DTA under pressure. The entropy of phase transitions is analyzed mainly in the framework of the orientational disordering of NH4+ and VO2F43- ions in a cubic phase. (C) 2008 Elsevier Masson SAS. All rights reserved.
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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) : 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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10.

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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11.

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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12.

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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13.

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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14.

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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15.

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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yasinskiy A. S., Padamata S. K., Polyakov P. V., Shabanov A. V.
Заглавие : An update on inert anodes for aluminium electrolysis
Место публикации : Non-Ferrous Met. - 2020. - Vol. 48, Is. 1. - P.15-23. - ISSN 20720807 (ISSN), DOI 10.17580/nfm.2020.01.03
Примечания : Cited References: 62. - The work is performed as a part of the state assignment for the science of Siberian Federal University, project number FSRZ-2020-0013. Use of equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged
Аннотация: This update includes the literature related to the inert anodes which were published in the past decade. The metallic anodes are widely regarded as promising candidates to replace the carbon anodes due to its attractive properties like good electrical conductivity, easy to manufacture and high resistance to high thermal shocks. The metals have been tested in pure state and alloy (binary, ternary) form. The oxide scale formed on the anode surface acts as a barrier between the electrolyte and the anode, which protects the anode from being dissolved. The layer of molten fluorides is formed between the scale and the metal anode after a certain time of polarization, and the oxide scale acts as a bipolar electrode. Metal like Cu is reduced at the internal side of the scale. This paper elaborates the effects of various parameters on the performance of the anode. Cu-based alloys (Cu – Ni – Fe and Cu – Al) have shown promising results and could perform well in low-temperature electrolytes. It has been well established that the Cu content in Cu – Ni – Fe and Cu – Al alloys plays a major role in the metal dissolution as the CuO/Cu2O scales formed on the outer layer act as a sacrificial one. The corrosion rate of an anode can be reduced by decreasing the operating temperature, which is possible by using the KF – AlF3 melts. The use of suspensions can increase the purity of the produced metal by stop-ping the anode products to come in contact with cathode metal. Many industries including RUSAL and ELYSIS are still conducting a considerable amount of research to develop an inert anode and are expecting to have a carbon-free cell in the nearest future.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Podorozhnyak, Sergey A., Chzhant, Anatoly, V, Maltsevt, Vadim K., Krayuhin, Ivan N., Patrin G. S., Sakash, Irina Yu
Заглавие : Structural changes of Co caused a change of the solution pH during chemical deposition
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2020. - Vol. 13, Is. 4. - P.451-458. - ISSN 1997-1397, DOI 10.17516/1997-1397-2020-13-4-451-458; Журн. СФУ. Матем. и физика. - ISSN 2313-6022(eISSN)
Примечания : Cited References: 10
Предметные рубрики: COBALT
MICROSTRUCTURE
Аннотация: The phase transformations of the Co lattice are discussed, which determine the anomalous changes in the magnetic properties of chemically deposited Co-P films obtained at various pH values. The coercivity of the H-c films obtained at low pH values exceeds 1 kOe and decreases to several units Oe in the films obtained at high pH values. It is shown that the observed changes in the magnetic properties of Co-P films are caused by the transition of the cobalt crystal lattice to the nanocrystalline state.Обсуждаются фазовые превращения решетки Co, которые определяют аномальные изменения магнитных свойств химически осажденных пленок Co-P, полученных при различных значениях pH. Коэрцитивная сила пленок, полученных при низких значениях pH, превышает 1 кЭ и снижается до нескольких единиц Э в пленках, полученных при высоких значениях pH. Показано, что наблюдаемые изменения магнитных свойств пленок Co-P вызваны переходом кристаллической решетки кобальта в нанокристаллическое состояние.
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18.

Вид документа : Статья из журнала
Шифр издания :
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
Шифр издания :
Автор(ы) : Verpekin V. V., Ahremchik I. S., Vasiliev A. D., Burmakina G. V., Kondrasenko A. A., Nedelina T. S., Kreindlin A. Z.
Заглавие : Transition metal catalyzed Fe–C coupling reactions in synthesis of dicarbonyl(2-thienylethynyl)(η5-cyclopentadienyl)iron complex: Spectroscopic, structure and electrochemical study
Место публикации : Transit. Met. Chem. - 2020. - Vol. 45. - P.589-594. - ISSN 03404285 (ISSN), DOI 10.1007/s11243-020-00413-9
Примечания : Cited References: 31. - This research was funded by a grant from the Russian Science Foundation (Project No. 18-73-00150)
Аннотация: The new σ-alkynyl iron(II) complex Cp(CO)2Fe-C≡C-(2-C4H3S) was synthesized with application of several known approaches based on the transition metal (Pd/Cu–, Au–, Cu– and Pd–) catalyzed Fe–C coupling reactions of 2-ethynylthiophene or 2-[(trimethylsilyl)ethynyl]thiophene with cyclopentadienyliron dicarbonyl iodide. The yield of the complex in these reactions was found to strongly depend on the catalyst used. The conditions, catalysts, and reagents that provide the highest yields of the desired 2-thienylethynyl iron complex were determined. The complex was characterized by IR, 1H and 13C NMR spectroscopy. The molecular structure of Cp(CO)2Fe–C≡C-(2-C4H3S) established by X-ray diffraction analysis exhibits a three-leg piano stool geometry. The redox properties of the new complex were studied.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen M., Nong S., Zhao Y., Riaz M. S., Xiao Y., Molokeev M. S., Huang F.
Заглавие : Renewable P-type zeolite for superior absorption of heavy metals: Isotherms, kinetics, and mechanism
Место публикации : Sci. Total Environ. - 2020. - Vol. 726. - Ст.138535. - ISSN 00489697 (ISSN), DOI 10.1016/j.scitotenv.2020.138535
Примечания : Cited References: 47. - This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFB0901600 ); National Science Foundation of China (Grant No. 21871008 ); Science and Technology Commission of Shanghai Municipality (Grant No. 14520722000 ) and China Postdoctoral Science Foundation [Grant No. 8206300161 ]. Thank Shuying Nong for her experimental assistance
Аннотация: Zeolite is a characteristic material for removing heavy metals exhibiting by low tolerance quantities. It is particularly desirable although challenging to cultivate an unmodified and reusable zeolite for eradicating heavy metals with great capacity. Herein, we sought out and firstly synthesized the uniform octahedral zeolite Na6Al6Si10O32·12H2O for heavy metal ions trap, proven extraordinarily effective decontamination of M2+ (Pb2+, Cd2+, Cu2+, and Zn2+). The maximum capacities of Pb2+, Cd2+, Cu2+, and Zn2+ were 649, 210, 90 and 88 mg/g, and the distribution coefficients (Kd) was ~108 mL/g for Pb2+ which emphasized the superior effectiveness of Na6Al6Si10O32·12H2O contrasted with other zeolites. Rapid adsorption was observed that Pb2+ concentration (7.5 ppm) was reduced to 0.6 ppb in 2 min. The removal mechanism was ascribed to the ion exchange and hydroxyl groups thereby affording high adsorption capacity. We also investigated the heavy metal removal of zeolite 13X and 4A for comparison and concluded the determining factor affecting absorption capacity. The removal rate of Pb remained at 97% even after five regeneration recycles. The zeolite was therefore promising for practical water purification and industrialization.
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