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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Воробьев С. А., Лихацкий М. Н., Романченко А. С., Иваненко Т. Ю., Машарова Д. А., Волочаев, Михаил Николаевич, Михлин Ю. Л.
Заглавие : Влияние реакционных условий на размер наночастиц серебра в концентрированных золях Carey Lea
Коллективы : RUSSIAN SCIENCE FOUNDATIONRussian Science Foundation (RSF) [18-73-00142]
Место публикации : Журн. СФУ. Химия. - 2020. - Т. 13, № 3. - С. 372-384. - ISSN 1998-2836, DOI 10.17516/1998-2836-0190; J. Sib. Fed. Univ. Chem. - ISSN 2313-6049(eISSN)
Примечания : Библиогр.: 34. - Работа выполнена при финансовой поддержке Российского научного фонда, грант No 18-73-00142
Предметные рубрики: AG NANOPARTICLES
CITRATE
AGGREGATION
SURFACE
STABILITY
KINETICS
Аннотация: В данной работе был изучен процесс восстановления растворов Ag (I) цитратными комплексами Fe (II), который позволяет получать наночастицы серебра с высокой стабильностью и концентрацией более 60 г/л. В ходе работы было установлено влияние скорости введения, скорости перемешивания, концентрации реагентов, рН среды и некоторых постсинтетических операций на средний размер наночастиц. Показано, что снижение концентрации Ag (I) и повышение концентрации стабилизатора, доведение рН реакционной среды до 7 позволяют получать наиболее мелкие и однородные частицы. В результате были найдены оптимальные условия, которые дали возможность уменьшить размер частиц и вместе с тем снизить концентрацию реактивов на 33 %. По данным РФЭС, ПЭМ, DLS и ИК были получены наночастицы металлического серебра с размером 6.5±1.8 нм, стабилизированные продуктом частичного распада цитрат-иона.The reaction of reduction solution of Ag (I) by Fe (II) citrate complex was studied herein. This allows you to receive silver nanoparticles with high stability with a concentration above 60 g/l. It was determined that the nanoparticles size depends on the injection rate, mixing rate, reagent concentration, pH and some post-synthetic operations on the average size of nanoparticles. It was shown that decreasing the concentration of Ag (I) and increasing the concentration of stabilizer also bringing pH to 7 lead to small and uniform particles. Optimal conditions were found that made it possible to reduce particle size and reduce the concentration of reagents by 33 % in the results. According to XPS, TEM, DLS and FTIR datas, nanoparticles of metallic silver with a size of 6.5±1.8 nm were obtained, which stabilized by the product of partial decay of the citrate ion.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N., Rudyak, V. Yu., Gardymova A. P., Zyryanov V. Ya.
Заглавие : Toroidal Configuration of a Cholesteric Liquid Crystal in Droplets with Homeotropic Anchoring
Коллективы : Russian Science Foundation [18-72-10036]; Ministry of Education and Science of the Russian Federation [RFMEFI62117X0011]
Место публикации : JETP Letters. - 2019. - Vol. 109, Is. 7. - P.478-481. - ISSN 0021-3640, DOI 10.1134/S0021364019070075. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 30. - This work was supported by the Russian Science Foundation (project no. 18-72-10036). The work was performed using the equipment of the Shared Usage Center of High-Capacity Computational Resources, Moscow State University, supported by the Ministry of Education and Science of the Russian Federation (project no. RFMEFI62117X0011).
Предметные рубрики: NEMATIC DROPLETS
SURFACE
Аннотация: Orientational structures formed in cholesteric droplets with homeotropic surface anchoring have been studied by means of polarization optical microscopy and computer simulations. It has been found that, when the ratio of the size of droplets to the pitch of a cholesteric helix ranges from 1.4 to 2.9, an axisymmetric toroidal cholesteric structure is formed with a topological linear defect in the form of an equatorially located surface ring. The features of the toroidal structure in cholesteric droplets and their optical textures for various observation schemes are examined in detail.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Atuchin V. V., Gavrilova T. A., Kesler V. G., Molokeev M. S., Aleksandrov K. S.
Заглавие : Structural and electronic parameters of ferroelectric K3WO3F3
Коллективы :
Место публикации : Solid State Commun. - 2010. - Vol. 150, Is. 43-44. - P.2085-2088. - ISSN 0038-1098, DOI 10.1016/j.ssc.2010.09.023
Примечания : Cited References: 34. - This study was partly supported by RFBR (Grant 09-02-00062) and SB RAS (Grant 34).
Предметные рубрики: CORE-LEVEL SPECTROSCOPY
PHASE-TRANSITIONS
RHEED ANALYSIS
SURFACE
OXYFLUORIDE
ELPASOLITE
(NH4)(2)KWO3F3
SUBSTITUTION
TEMPERATURE
DIFFRACTION
Ключевые слова (''Своб.индексиров.''): ferroelectrics--chemical synthesis--electronic structure--photoelectron spectroscopies
Аннотация: The low-temperature ferroelectric G2 polymorph of K3WO3F3 oxyfluoride is formed by chemical synthesis. The electronic parameters of G2-K3WO3F3 have been measured by X-ray photoelectron spectroscopy under excitation with Al K alpha radiation (1486.6 eV). Detailed spectra have been recorded for all element core levels and Auger lines. The chemical bonding effects in the WO3 F-3 and WO6 octahedrons are considered by using the binding energy difference Delta BE(O-W) = BE(O 1s) BE(W 4f(7/2)). (C) 2010 Elsevier Ltd. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V.
Заглавие : Splitting of the spectrum of fermionic excitations in a topological insulator by charge fluctuations
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-02-00348]
Место публикации : JETP Letters. - 2021. - Vol. 114, Is. 12. - P.751-756. - ISSN 0021-3640, DOI 10.1134/S0021364021240097. - ISSN 1090-6487(eISSN)
Примечания : Cited References: 22. - This work was supported by the Russian Foundation for Basic Research (project no. 19-02-00348)
Предметные рубрики: HUBBARD FERMIONS
EDGE STATES
PHASE
SURFACE
Аннотация: It is shown that the intersite Coulomb interaction of electrons in a topological insulator leads to the splitting of the initial energy structure and to the induction of two bands of fluctuation states. As a result, the total spectrum of Fermi excitations of the topological insulator has a four-band structure. The dielectric gap is determined by the energy interval between the bottom of the band of fluctuation states of conduction electrons and the top of the valence band of fluctuation states. Since the band of fluctuation states is narrow, quasiparticles with different effective masses appear.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Edelman I. S., Ovchinnikov S. G., Markov V. V., Kosyrev N. N., Seredkin V. A., Khudyakov A. E., Bondarenko G., Kesler V.
Заглавие : Room-temperature ferromagnetism in Dy films doped with Ni
Место публикации : Physica B: ELSEVIER SCIENCE BV, 2008. - Vol. 403, Is. 18. - P3295-3301. - ISSN 0921-4526, DOI 10.1016/j.physb.2008.04.018
Примечания : Cited References: 25. - The work was supported partly by the Integration Project of SB RAS (# 3.5), Program "Spintronics" of the Department of Physical Sciences of RAS, and RFBR Grant no. 07-03-00320.
Предметные рубрики: METAL NANOSCALE MULTILAYERS
EARTH
MAGNETISM
SURFACE
Ключевые слова (''Своб.индексиров.''): dy--dy-ni bi-layer films--magnetic ordering--magnetic circular dichroism--magneto-optic kerr effect--auger spectroscopy--auger spectroscopy--dy--dy-ni bi-layer films--magnetic circular dichroism--magnetic ordering--magneto-optic kerr effect--magnetic fields--nickel--bi layer films--magnetic (ce)--magneto optical--room temperature (rt) ferromagnetism--spectral dependences--magnetic field effects
Аннотация: Temperature, magnetic field and spectral dependences of magneto-optical effects (MOEs) in bi-layer films Dy(1-x)Nix-Ni and Dy(1-x)(NiFe)(x)-NiFe were investigated, x changes from 0 to 0.06. Peculiar behavior of the MOEs was revealed at temperatures essentially exceeding the Curie temperature of bulk Dy which is explained by the magnetic ordering of the Dy layer containing Ni under the action of two factors: Ni impurities distributed homogeneously over the whole Dy layer and atomic contact of this layer with continues Ni layer. The mechanism of the magnetic ordering is suggested to be associated with the change of the density of states of the alloy Dy(1-x)Nix owing to hybridization with narrow peaks near the Fermi level character for Ni. (C) 2008 Elsevier B.V. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Muzalevskiy K. V., Ruzicka Z.
Заглавие : Retrieving profile temperatures in a frozen topsoil near the TFS, Alaska, based on SMOS brightness temperatures at the 1.4-GHz frequency
Коллективы : Russian Science Foundation [4-17-00656]
Место публикации : IEEE Trans. Geosci. Remote Sensing/ funding agency: IEEE-Institute Electrical and Electronics Engineers, 2016. - Vol. 54, Is. 12. - P.7331-7338. - ISSN 0196-2892, DOI 10.1109/TGRS.2016.2599272. - ISSN 1558-0644(eISSN)
Примечания : Cited References:25. - This work was supported by the Russian Science Foundation through Project 4-17-00656.
Предметные рубрики: DIELECTRIC MODEL
ARCTIC SOIL
SURFACE
BOREAL
TUNDRA
GHZ
Ключевые слова (''Своб.индексиров.''): microwave radiometry--remote sensing--soil measurements--temperature--measurement
Аннотация: In this paper, the method previously proposed in earlier work for measuring the temperature profile in a frozen topsoil using multiangular brightness temperature observations in the L-band has been experimentally tested. At a frequency of 1.4 GHz, full-polarization multiangular brightness temperature data were obtained from the Soil Moisture and Ocean Salinity (SMOS) satellite land product of Level 1C, with the SMOS footprint being centered at the Toolik Field Station (TFS), Alaska. The SMOS data covered the period from January 1, 2010 to December 31, 2011. Retrieval of the temperature profiles in a frozen topsoil was based on the semiempirical emission model L-MEB and the temperature-dependent dielectric model for an organic-rich tundra soil. The soil samples measured to develop the dielectric model were collected at the TFS site. For winter seasons, the retrieved temperature profiles in the 16.0-cm topsoil were validated relative to the temperature profiles measured in situ. As a result, the values of root-mean-square error and determination coefficient of the temperatures retrieved at the depths of 0.6, 8.7, and 16.0 cm, relative to the respective temperatures measured in situ, were found to be 2.8 °C, 4.9 °C, and 6.4 °C and 0.62, 0.42, and 0.26, respectively. The sources of error and possible improvements of the proposed retrieving algorithm were discussed. The major result of this study is the demonstration of the potential possibility for remote sensing of the temperature profile in a frozen arctic topsoil using the SMOS multiangular brightness data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F., Gerasimov V. P., Zyryanov V. Ya.
Заглавие : Resonant angular conversion in a Fabry-Perot resonator holding a dielectric cylinder
Коллективы : RFBR [13-02-00497, 43, 101, 24.29]
Место публикации : J. Opt. Soc. Am. A: Optical Society of America, 2014. - Vol. 31, Is. 2. - P.264-267. - ISSN 1084-7529, DOI 10.1364/JOSAA.31.000264. - ISSN 1520-8532
Примечания : Cited References: 8. - This work was partially supported by RFBR grant 13-02-00497, and grants no. 43, 101 and 24.29 of SB RAS, and NSCT-SB RAS. We thank D. N. Maksimov for critical reading of the manuscript.
Предметные рубрики: SCATTERING
SURFACE
Аннотация: Light transmission through a Fabry–Perot resonator (FPR) holding a dielectric cylinder rod is considered. For the cylinder parallel to mirrors of the FPR and the mirrors mimicked by the δ functions we present an exact analytical theory. It is shown that light transmits only for resonant incident angles, αm, similar to the empty FPR. However after transmission the light scatters into different resonant angles, αm′ , performing resonant angular conversion. We compare the theory with experiment in the FPR, exploring multilayer films as the mirrors and glass cylinder with diameter coincided with the distance between the FPR mirrors. The measured values of angular light conversion agree qualitatively with the theoretical results.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. S., Alexandrova G. A., Dolbak A. E., Pchelyakov O. P., Ol'shanetski B. Z., Ovchinnikov S. G., Kushchenkov S. A.
Заглавие : Reflection electron-energy-loss spectroscopy of FexSi1-x thin films
Место публикации : Tech. Phys. Lett.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 34, Is. 5. - P381-383. - ISSN 1063-7850, DOI 10.1134/S1063785008050064
Примечания : Cited References: 13. - This study was supported within the framework of the “Spintronics” Program of the Department of Physics of the Russian Academy of Sciences (project no. 2007-3-1.3-24-01-286) and the Russian Foundation for Basic Research (project no. 07-03-00320)
Предметные рубрики: SCATTERING CROSS-SECTIONS
LOSS SPECTRA
QUANTITATIVE-ANALYSIS
SURFACE
Аннотация: The values of the product of the inelastic mean free path and the differential cross section for inelastic scattering of electrons have been determined from the reflection electron-energy-loss spectra of thin films of the FexSi1-x system (0
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Krasnov P. O., Kozhevnikova T. A., Popov M. N., Artyushenko P. V.
Заглавие : Peculiarities of the decoration of carbon nanotubes with transition metal atoms
Место публикации : Russ. J. Phys. Chem. B: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 5, Is. 1. - P163-167. - ISSN 1990-7931, DOI 10.1134/S1990793111010076
Примечания : Cited References: 12. - The authors thank Interdepartmental Supercomputer Center, Russian Academy of Sciences, for the possibility of using a cluster computer, and Siberian Federal University for providing a supercomputer, on which quantum-chemical calculations were performed. This work was financially supported by the Analytic Departmental Special-Purpose Program "The Development of the Scientific Potential of the Higher School (2009-2010)" (project no. 2.1.1/2584).
Предметные рубрики: INITIO MOLECULAR-DYNAMICS
SURFACE
ENERGY
Ключевые слова (''Своб.индексиров.''): carbon nanotubes--decoration--transition metal atoms--carbon nanotubes--decoration--transition metal atoms
Аннотация: Carbon nanotubes decorated with transition metal, in particular, scandium, titanium, and vanadium, atoms offer promise for use in various applied science fields. We report the results of quantum-chemical calculations of the structure of the metallic layer of atoms of these metals coating the surface of (9, 0) and (10, 0) carbon nanotubes. It was shown that uniform one-layer coating by scandium and titanium could form on nanotubes with diameters no less than the diameter of (10, 0) nanotubes. Vanadium atoms could not uniformly cover nanotubes irrespective of their diameters.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krakhalev M. N.
Заглавие : Oblique light incidence method to study topological defects in nematic layers with conical boundary conditions
Место публикации : Sci. Rep. - 2021. - Vol. 11, Is. 1. - Ст.17433. - ISSN 2045-2322, DOI 10.1038/s41598-021-96784-9
Примечания : Cited References: 54
Предметные рубрики: CHOLESTERIC FINGERS
DISCLINATIONS
SURFACE
WALLS
ORDER
Аннотация: A polarization microscopy method to investigate the orientational structures and boojums formed in the chiral and achiral nematic layers under conical (tilted) boundary conditions has been developed. Oblique light incidence on nematic layer is used, due to which the phase difference between the ordinary and extraordinary waves depends on the director’s azimuthal angle. The phase difference gets maximal when the director azimuthal angle of achiral nematic φ(x,y)=0 and an azimuthal angle at the center of the chiral nematic layer φ0(x,y)=0 independently of the total twist angle φTOTAL. It has been found that the m=+1 boojums with the phase ξ=±90° and ξ=(−90°+φTOTAL/2) are formed in achiral and chiral nematics, respectively, at the director tilt angle θd/2≅40° at the interface. In addition, the defectless structure of chiral nematic with the periodically variable azimuthal director angle on the substrates has been studied.
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