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Вид документа : Статья из журнала
Шифр издания :
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Zhigalov V. S., Bykova L. E., Solovyov L. A., Matsynin A. A., Balashov Yu. Yu., Nemtsev I. V., Shabanov A. V., Bondarenko G. N.
Заглавие : Solid-state synthesis, dewetting, and magnetic and structural characterization of interfacial FexSn1−x layers in Sn/Fe(001) thin films
Место публикации : J. Mater. Res. - 2021. - Vol. 36, Is. 15. - P.3121-3133. - ISSN 08842914 (ISSN), DOI 10.1557/s43578-021-00312-4
Примечания : Cited References: 43. - This work was supported by the Russian Foundation for Basic Research together with the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Fund of Science (Grant #19-43-240003). The work is partially based upon the experiments performed on Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS»
Аннотация: The phase formation sequences in 9Sn/91Fe(001) and 25Sn/75Fe(001) bilayers during thin-film solid-state reactions up to 800°C were investigated using X-ray diffraction, the torque method, and scanning electron microscopy. In both samples, FeSn2, FeSn, α-Fe1−xSnx, Fe5Sn3, α-Fe, and β-Sn were sequentially formed at the initiation temperatures Tini ~ 150°C, ~ 300°C, ~ 550°C, ~ 600°C, and ~ 700°C, respectively. Low-temperature transformations were predicted at temperatures TK1 ~ 150°C and TK2 ~ 300°C, which are absent in the phase equilibrium diagram of the Fe–Sn system. Solid-state dewetting of the 9Sn/91Fe(001) and 25Sn/75Fe(001) bilayers started at temperatures above 550°C. Overall, this work sheds new light on general chemical mechanisms governing the synthesis of intermetallic phases in Sn/Fe(001) thin films, the phase transformations, and the evolution of the dewetting process of FexSn1−x films.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Киселев, Евгений Геннадьевич, Васильев, Александр Дмитриевич, Волова Т. Г.
Заглавие : Синтез и характеристики многокомпонентных ПГА
Место публикации : Журн. СФУ. Биология. - 2021. - Т. 14, № 1. - С. 97-113. - ISSN 1997-1389 (ISSN), DOI 10.17516/1997-1389-0325; J. Sib. Fed. Univ. Biol. - ISSN 2313-5530 (eISSN)
Примечания : Библиогр.: 32. - Работа выполнена по гранту No 19-43-240012 «Биологические и физические принципы получения биоматериалов новой генерации» при поддержке РФФИ и ККФН и госзаданию Министерства науки и высшего образования РФ No FSRZ-2020-0006. В работе использовано оборудование Центра коллективного пользования приборами ФИЦ «КНЦ СО РАН»
Аннотация: В культуре бактерий Cupriavidus necator B10646 в режиме синтеза резервных полигидроксиалканоатов при включении в состав ростовой среды, помимо основного субстрата, глюкозы, субстратов-предшественников различных мономеров монокарбоновых кислот – солей валериановой и гексановой кислот, пропионата, γ-бутиролактона, синтезировано семейство трех- и четырехкомпонентных полимеров с различным набором и соотношением мономеров и исследованы физико-химические свойства. Трехкомпонентные образцы были образованы мономерами 3-гидроксибутирата (3ГБ), 3-гидроксивалерата (3ГВ), 4-гидроксибутирата (4ГБ) или 3-гидроксигексаноата (3ГГ) и имели следующие составы: П(3ГБ/3ГВ/4ГБ) и П(3ГБ/3ГВ/4ГГ); четырехкомпонентные сополимеры имели состав П(3ГБ/3ГВ/4ГБ/3ГГ). Все сополимерные образцы, независимо от состава и соотношения мономеров, обладали сниженными значениями молекулярной массы и повышенными значениями полидисперсности по сравнению с высококристалличным гомополимером 3-гидроксибутирата, но сохраняли свойства термостабильности, имея разрыв между температурой плавления и термической деградации не менее 100-110 °С. Включение в С-цепь 3ГБ мономеров 3ГВ, 4ГБ и 3ГГ вызывало значительные изменения соотношения кристаллической и аморфной фаз и снижение степени кристалличности (Сх), зависящие от типа мономеров и их содержания в сополимере. Максимальное снижение Сх (до 9-17 %) зарегистрировано у трехкомпонентных образцов П(3ГБ/3ГВ/4ГБ), у четырехкомпонентных сополимеров П(3ГБ/3ГВ/4ГБ/3ГГ) – до 30-36 %. Доказана возможность синтеза полимеров разного, в том числе нового, состава, существенно различающихся базовыми свойствами.Cupriavidus necator B10646 bacterial cells were cultivated in the mode of synthesis of the reserve polyhydroxyalkanoates (PHAs) in the growth medium that contained, in addition to glucose as the main substrate, precursor substrates of the monomers of various monocarboxylic acids – salts of valeric and hexanoic acids, propionate, and γ-butyrolactone. PHA terpolymers and quaterpolymers with different compositions and proportions of monomers were synthesized, and their physicochemical properties were studied. The terpolymers were composed of monomers of 3-hydroxybutyrate (3HB), 3-hydroxyvalerate (3HV), 4-hydroxybutyrate (4HB), or 3-hydroxyhexanoate (3HHx) and had the following compositions: P(3HB/3HB/4HHx) and P(3HB/3HV/4HHx). The quaterpolymers had the following composition: P(3HB/3HV/4HB/3HHx). All copolymer samples, regardless of the composition and proportions of monomers, had lower molecular weights and higher polydispersity values compared to the highly crystalline 3-hydroxybutyrate homopolymer, but retained thermal stability properties, with a difference between the melting point and thermal degradation of at least 100-110 °С. The inclusion of 3HV, 4HB, and 3HHx monomers in the C-chain of 3HB caused changes in the crystalline to amorphous phase ratio and a significant decrease in the degree of crystallinity (Cx), which depended on the type of monomers and their contents in the copolymer. The maximum decrease in Cx (9-17 %) was detected in the P(3HB/3HV/4HB) terpolymer and the P(3HB/3HV/4HB/3HHx) quaterpolymer (30-36 %). The study confirms that there is the possibility of synthesizing polymers with various compositions, including new ones, which differ significantly in their basic properties.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y. L., Likhatski M. N., Bayukov O. A., Knyazev Yu. V., Velikanov D. A., Tomashevich Y. V., Romanchenko A. S., Vorobyev S. A., Volochaev M. N., Zharkov S. M., Meira D. M.
Заглавие : Valleriite, a natural two-dimensional composite: X-ray absorption, photoelectron, and Mossbauer spectroscopy, and magnetic characterization
Место публикации : ACS Omega. - 2021. - Vol. 6, Is. 11. - P.7533-7543. - ISSN 24701343 (ISSN), DOI 10.1021/acsomega.0c06052
Примечания : Cited References: 92. - This research was supported by the Russian Science Foundation, project 18-17-00135. The authors thank Dr. Y. Laptev for providing valleriite samples, the ESRF for allocating beamtime and the BM23 staff for their help during the experiments. Facilities of the Krasnoyarsk Regional Research Equipment Centre of SB RAS were employed in the work
Аннотация: Valleriite is of interest as a mineral source of basic and precious metals and as an unusual material composed of two-dimensional (2D) Fe-Cu sulfide and magnesium hydroxide layers, whose characteristics are still very poorly understood. Here, the mineral samples of two types with about 50% of valleriites from Noril'sk ore provenance, Russia, were examined using Cu K- and Fe K-edge X-ray absorption fine structure (XAFS) spectroscopy, X-ray photoelectron spectroscopy (XPS), 57Fe Mossbauer spectroscopy, and magnetic measurements. The Cu K X-ray absorption near-edge structures (XANES) spectra resemble those of chalcopyrite, however, with a higher electron density at Cu+ centers and essentially differ from those of bornite Cu5FeS4; the Fe K-edge was less informative because of accompanying oxidized Fe-containing phases. The post-edge XANES and extended XAFS (EXAFS) analysis reveal differences in the bond lengths, e.g., additional metal-metal distances in valleriites as compared with chalcopyrite. The XPS spectra confirmed the Cu+ and Fe3+ state in the sulfide sheets and suggest that they are in electron equilibrium with (Mg, Al) hydroxide layers. Mossbauer spectra measured at room temperature comprise central doublets of paramagnetic Fe3+, which decreased at 78 K and almost disappeared at 4.2 K, producing a series of hyperfine Zeeman sextets due to internal magnetic fields arising in valleriites. Magnetic measurements do not reveal antiferromagnetic transitions known for bornite. The specific structure and properties of valleriite are discussed in particular as a platform for composites of the 2D transition metal sulfide and hydroxide (mono)layers stacked by the electrical charges, promising for a variety of applications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shtarev, Dmitry S., Shtareva, Anna, V, Kevorkyants, Ruslan, Molokeev M. S., Serpone, Nick
Заглавие : Revisiting the BaBiO3 semiconductor photocatalyst: synthesis, characterization, electronic structure, and photocatalytic activity
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [19-73-10013]
Место публикации : Photochem. Photobiol. Sci. - 2021. - Vol. 20, Is. 9. - P.1147-1160. - ISSN 1474-905X, DOI 10.1007/s43630-021-00086-y. - ISSN 1474-9092(eISSN)
Примечания : Cited References: 48. - We wish to thank the Russian Science Foundation for a Grant (Project No. 19-73-10013) in support of our study. The authors are also grateful to the staff of the following Institutes/Centers for their valuable technical assistance and in providing the needed equipment: (i) the Khabarovsk Innovation and Analytical Center of the Yu. A. Kosygin Institute of Tectonics and Geophysics FEB RAS; and (ii) the Resource Centers of the Research Park at Saint-Petersburg State University, especially the Center for Physical Methods of Surface Investigation and the Nanophotonics Center. One of us (NS) is grateful to the staff of the PhotoGreen Laboratory of the University of Pavia, Italy, for their continued hospitality
Предметные рубрики: RHODAMINE-B
OXIDE
DRIVEN
SUPERCONDUCTIVITY
PSEUDOPOTENTIALS
Аннотация: This article revisits the properties of BaBiO3 examined extensively in the last two decades because of its electronic properties as a superconductor and as a semiconductor photocatalyst. Solid-state syntheses of this bismuthate have often involved BaCO3 as the barium source, which may lead to the formation of BaBiO3/BaCO3 heterostructures that could have an impact on the electronic properties and, more importantly, on the photocatalytic activity of this bismuthate. Accordingly, we synthesized BaBiO3 by a solid-state route to avoid the use of a carbonate; it was characterized by XRD, SEM, and EDX, while elemental mapping characterized the composition and the morphology of the crystalline BaBiO3 and its thin films with respect to structure, optoelectronic, and photocatalytic properties. XPS, periodic DFT calculations, and electrochemical impedance spectroscopy ascertained the electronic and electrical properties, while Raman and DRS spectroscopies assessed the relevant optical properties. The photocatalytic activity was determined via the degradation of phenol in aqueous media. Although some results accorded with earlier studies, the newer electronic structural data on this bismuthate, together with the photocatalytic experiments carried out in the presence of selective radical trapping agents, led to elucidating some of the mechanistic details of the photocatalytic processes that previous views of the BaBiO3 band structure failed to address or clarify. Analytical refinement of the XRD data inferred the as-synthesized BaBiO3 adopted the C2/m symmetry rather than the I2/m structure reported earlier, while Tauc plots from DRS spectra yielded a bandgap of 2.05 eV versus the range of 1.1–2.25 eV reported by others; the corresponding flatband potentials were 1.61 eV (EVB) and − 0.44 eV (ECB). The photocatalytic activity of BaBiO3 was somewhat greater than that of the well-known Evonik P25 TiO2 photocatalyst under comparable experimental conditions.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Cazacu, Nicoleta, Chilom, Claudia G., Iftimie, Sorina, Balasoiu, Maria, Ladygina, Valentina P., Stolyar S. V., Orelovich, Oleg L., Kovalev, Yuriy S., Rogachev, Andrey V.
Заглавие : Biogenic ferrihydrite nanoparticles produced by Klebsiella oxytoca: Characterization, physicochemical properties and bovine serum albumin interactions
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 2. - Ст.249. - ISSN 2079-4991(eISSN), DOI 10.3390/nano12020249
Примечания : Cited References: 59. - This research was funded by JINR Themes 02-1-1107-2011/2021, 04-5-1131-2017/2021 and 04-4-1133-2018/2023 and with the financial support of the RO-JINR Projects Nos. 366/11.05.2021 (items 7, 86, 97) and 365/11.05.2021 (items 8, 87 and 98). This work also benefited from the use of the SasView application, originally developed under NSF Award DMR-0520547. SasView also contains the code developed with funding from the EU Horizon 2020 program under the SINE2020 project Grant No 654000. The APC was funded by JINR Theme 02-1-1107-2011/2021, Project No. 366/11.05.2021, item 7. This study used the infrastructure of the Applied Genetics Resource Facility of MIPT (Suport Grant 075-15-2021-684)
Предметные рубрики: MAGNETIC-PROPERTIES
REDUCTION
MOSSBAUER
FERRITIN
DOCKING
BINDING
Аннотация: The synthesis of nanoparticles inside microorganisms is an economical alternative to chemical and physical methods of nanoparticle synthesis. In this study, ferrihydrite nanoparticles synthesized by Klebsiella oxytoca bacterium in special conditions were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), small-angle X-ray (SAXS), UV-Vis spectroscopy, fluorescence, fluorescence resonance energy transfer (FRET), and molecular docking. The morphology and the structure of the particles were characterized by means of SEM and SAXS. The elemental content was determined by means of the EDS method. The absorption properties of the ferrihydrite nanoparticles were investigated by UV-Vis spectroscopy. The binding mechanism of the biogenic ferrihydrite nanoparticles to Bovine Serum Albumin (BSA) protein, studied by fluorescence, showed a static and weak process, combined with FRET. Protein denaturation by temperature and urea in the presence of the ferrihydrite nanoparticles demonstrated their influence on the unfolding process. The AutoDock Vina and UCSF Chimera programs were used to predict the optimal binding site of the ferrihydrite to BSA and to find the location of the hydrophobic cavities in the sub-domain IIA of the BSA structure.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ovchinnikov S.G., Varnakov S.N., Fedorov A.S., Lyaschenko S.A., Yakovlev I.A.
Заглавие : Characterization and magnetic properties of the iron silicides
Коллективы : Asian School-Conference on Physics and Technology of Nanostructured Materials, Азиатская школа-конференция по физике и технологии наноструктурированных материалов
Место публикации : Proceedings Asian School-Conference on Physics and Technology of Nanostructured Materials (ASCO-NANOMAT 2011)/ Asian School-Conference on Physics and Technology of Nanostructured Materials (2011 ; Aug. ; 22-29 ; Vladivostok, Russia), Азиатская школа-конференция по физике и технологии наноструктурированных материалов (1 ; 2011 ; авг. ; 21-28 ; Владивосток). - 2011
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Muzalevskiy K. V., Karavaysky A. Yu.
Заглавие : Shielded open-circuited probe for in-situ measurements of soil permittivity in Very high frequency (VHF) and Ultra high frequency (UHF) bands
Коллективы : SB RAS project [0287-2021-0034]
Место публикации : Trans. Inst. Meas. Control. - 2021. - Vol. 43, Is. 16. - P.3566-3572. - ISSN 0142-3312, DOI 10.1177/01423312211037791. - ISSN 1477-0369(eISSN)
Примечания : Cited References: 30. - The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the SB RAS project No. 0287-2021-0034
Предметные рубрики: DIELECTRIC CHARACTERIZATION
MOISTURE
Аннотация: In this paper, the shielded open-circuited probe operating in the wide frequency range from 75MHz to 2GHz is proposed. The probe is made of an SubMiniature version A (SMA) flange connector. The central rod of the SMA connector emerges from a coaxial transition in the flange and shielded by four rods. The robe design allows us to calculate of the probe reflection coefficient S11 used simple analytical transmission line model (TEM wave mode), the parameters of which were calibrated on a set of substances with a known frequency spectrum of permittivity. The refractive index (RI) and normalized attenuation coefficient (NAC) retrieval technique is based on solving the inverse problem of minimizing the residual norm between measured and calculated frequency spectra of reflection coefficient S11. After calibration, the root-mean-square error (determination coefficient) between the measured and calculated module and phase of the reflection coefficient S11 for the sets of calibration media air, distilled water, butanol, pure ice, water solution with NaCl of salinity of 8.9% do not exceed 0.26dB (0.995) and 0.03 rad (0.999), respectively, in the frequency range from 75MHz to 2GHz. The root-mean-square error (determination coefficient) between the measured RI and NAC spectra for four soil cover samples (variation of the clay fraction from 10.5 g/g to 47.6 g/g) using the proposed probe and a precision coaxial cell not exceeds 0.109 (0.993) and 0.057 (0.986), respectively, in the frequency range from 75 MHz to 2 GHz. As a result, it is experimentally shown that RI и NAC can be measured by the proposed non-precision probe with an error comparable to the precision coaxial cell.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sobolev, Kirill, Pazniak, Hanna, Farle M., Rodionova, Valeria, Wiedwald, Ulf
Заглавие : Synthesis, phase purification and magnetic characterization of the (Cr1−x, Mnx)2AlC MAX-phase
Коллективы : Deutsche Forschungsgemeinschaft (DFG)German Research Foundation (DFG) [CRC/TRR 270, 405553726]; German-Russian Interdisciplinary Science Center (G-RISC); 5 top 100 Academic Excellence Project of the Russian Ministry of Science and Higher Education; government of the Russian Federation [075-15-2019-1886]
Место публикации : J. Mater. Chem. C. - 2021. - Vol. 9, Is. 46. - P.16516-16522. - ISSN 2050-7526, DOI 10.1039/d1tc03092b. - ISSN 2050-7534(eISSN)
Примечания : Cited References: 36. - This work was supported by the Deutsche Forschungsgemeinschaft (DFG) within CRC/TRR 270, project B02 (Project-ID 405553726). K. S. acknowledges German-Russian Interdisciplinary Science Center (G-RISC) for the provided mobility grant that supported the present work. K. S. also acknowledges 5 top 100 Academic Excellence Project of the Russian Ministry of Science and Higher Education for the provided financial support. M. F. acknowledges co-funding by the government of the Russian Federation (agreement No. 075-15-2019-1886)
Аннотация: The Cr2AlC MAX phase is a promising parent compound to introduce magnetism to nano-laminated ternary carbides by doping with Mn. Here, we demonstrate that Mn doping of bulk Cr2AlC powder synthesized by arc melting results in incorporation up to 16 at% Mn in the M-layers of the MAX phase. Simultaneously, the relative amount of secondary phases is overall low, however, increases with Mn doping. We successfully applied chemical treatment in dilute hydrochloric acid to eliminate secondary phases and studied the magnetic properties before and after treatment by magnetometry between 3 K and 800 K. All MAX-phases show a paramagnetic response.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Bykova L. E., Zhigalov V. S., Matsynin A. A., Velikanov D. A., Bondarenko G. N.
Заглавие : Solid-state synthesis, rotatable magnetic anisotropy and characterization of Co1-xPtx phases in 50Pt/50fccCo(001) and 32Pt/68fccCo(001) thin films
Место публикации : J. Alloys Compd. - 2021. - Vol. 861. - Ст.157938. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2020.157938
Примечания : Cited References: 80. - This study was supported by the Russian Foundation for Basic Research , Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science for the research projects no. 19-43-240003. The authors thank I.V. Nemtsev for assisting with the measurements of the samples’ composition. The work is partially based upon the experiments performed at Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS»
Аннотация: We reported the phase formation sequences in 50Pt/50fcc-Co(001) and 32Pt/68fcc-Co(001) thin films after annealing up to 850 °C. In both cases, the ordered L10 phase formed first on the Pt/Co interface at ∼400 °C and as the annealing temperature increased the L10 phase transformed into the chemically disordered fcc A1 phase in 50Pt/50fcc-Co(001) at 750 °C and in 32Pt/68fcc-Co(001) films at 550 °C. Based on the analysis of solid-state reactions in thin films, a phase transition at ∼ 400 °C is predicted in Co-Pt systems with a 32–72% Pt composition. Torque measurements of the 50Pt/50fcc-Co(001) samples showed that the rotatable magnetic anisotropy coexisted with the three variants of L10 in a temperature range of 400–750 °C. An analysis of the torque curves revealed that the L10 films consist of a soft magnetic layer epitaxially intergrown to the substrate MgO(001) and a top layer having rotatable magnetic anisotropy. It showed that the magnetically hard properties of L10 films are associated with a rotatable magnetic anisotropy layer. A model of rotatable magnetic anisotropy is reasoned, which is founded on some identical mechanisms of rotatable magnetic anisotropy and magnetic-field-induced strains, explaining the ferromagnetic shape-memory effect in Heusler alloys. Our results suggested that the rotatable magnetic anisotropy phenomena may have an important role in the origin of perpendicular anisotropy in hard magnetic L10 structures.
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