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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Stan S., Balasoiu M., Cristescu C. P., Stolyar S. V., Iskhakov R. S., Raikher Yu. L.
Заглавие : 2nd Fractional Brownian motion simulation for the fractal properties of ferryhidrite nanoparticles
Коллективы : "Complex and magnetic soft matter systems: physico-mechanical properties and structure", International summer school and workshop
Место публикации : 2nd International summer school and workshop complex and magnetic soft matter systems: physico-mechanical properties and structure: books of abstacs. - 2014. - P.78-79
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Ivantsov R. D., Edelman I. S., Petrakovskaja E. A.
Заглавие : A comparative study of γ-Fe2O3 and ε-Fe2O3 nanoparticles arising in borate glasses doped with Fe and Gd
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.P9.11. - P.397. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 1. - The work was supported partly by the RFBR grant No. 14-02-01211
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--magnetic circular dichroism--magnetic measurements
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova O. S., Ivantsov R. D., Edelman I. S., Petrakovskaja E. A.
Заглавие : A comparative study of γ-Fe2O3 and ε-Fe2O3 nanoparticles arising in borate glasses doped with Fe and Gd
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2016. - Vol. 9, Is. 4. - P.459–462. - ISSN 1997-1397, DOI 10.17516/1997-1397-2016-9-4-459-462; Журн. СФУ. Сер. "Математика и физика"
Примечания : Cited References: 6. - The work was supported partly by the RFBR, 14-02-01211-a, and by the President of Russia Grant NSh-7559.2016.2.
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--magnetic circular dichroism--magnetic measurements--магнитные наночастицы--магнитный круговой дихроизм--магнитные измерения
Аннотация: Formation and properties of the iron oxides γ -Fe2O3 and ϵ-Fe2O3 nanoparticles arising in glasses of basic compositions Ge2O-K2O-Al2O3-B2O3 and K2O-Al2O3-B2O3 doped with different concentrations of Fe2O3 and Gd2O3 and subjected to the additional thermal treatment are studied. The X-ray diffraction, TEM microscopy, magnetooptical effects, and electron spin resonance study allow elucidating the matrix and Gd role in determining the nanoparticle properties.Изучены свойства наночастиц γ-Fe2O3 и ϵ-Fe2O3, формирующихся в стеклах основного состава Ge2O-K2O-Al2O3-B2O3 и K2O-Al2O3-B2O3, допированных Fe2O3 и Gd2O3 и подвергнутых дополни- тельной термической обработке. Результаты исследования рентгеновской дифракции, электрон- ной микроскопии, магнитооптических эффектов и электронного спинового резонанса позволили объяснить роль матрицы и гадолиния в определении свойств наночастиц.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Eremkin E. V., Krasnov P. O., Gerasimov V. S., Agren H., Polyutov S. P.
Заглавие : A hybrid quantum–classical theory for predicting terahertz charge-transfer plasmons in metal nanoparticles on graphene
Колич.характеристики :13 с
Место публикации : J. Chem. Phys. - 2024. - Vol. 160, Is. 4. - Ст.044117. - ISSN 00219606 (ISSN), DOI 10.1063/5.0178247. - ISSN 10897690 (eISSN)
Примечания : Cited References: 61. - This study was funded by the Ministry of Science and High Education of Russian Federation, Project No. FSRZ-2023-0006. The calculations of CTPs in specific NP–graphene complexes were performed within the RSF Grant No. 23-12-20007 and the Krasnoyarsk Territorial Foundation for Support of Scientific and R & D Activities, Agreement No. 256. H. Ågren was supported by the Swedish Science Research Council on Contract No. 2022-03405
Аннотация: Metal nanoparticle (NP) complexes lying on a single-layer graphene surface are studied with a developed original hybrid quantum–classical theory using the Finite Element Method (FEM) that is computationally cheap. Our theory is based on the motivated assumption that the carrier charge density in the doped graphene does not vary significantly during the plasmon oscillations. Charge transfer plasmon (CTP) frequencies, eigenvectors, quality factors, energy loss in the NPs and in graphene, and the absorption power are aspects that are theoretically studied and numerically calculated. It is shown the CTP frequencies reside in the terahertz range and can be represented as a product of two factors: the Fermi level of graphene and the geometry of the NP complex. The energy losses in the NPs are predicted to be inversely dependent on the radius R of the nanoparticle, while the loss in graphene is proportional to R and the interparticle distance. The CTP quality factors are predicted to be in the range ~ 10 – 100. The absorption power under CTP excitation is proportional to the scalar product of the CTP dipole moment and the external electromagnetic field. The developed theory makes it possible to simulate different properties of CTPs 3–4 orders of magnitude faster compared to the original FEM or the finite-difference time domain method, providing possibilities for predicting the plasmonic properties of very large systems for different applications.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Fedorov A. S., Churilov G. N., Kuzubov A.A., Serjantova M.V.
Заглавие : Ab-initio investigation of hydrogen absorption by magnesium nanoparticles
Коллективы : "Carbon Nanomaterials in Clean-Energy Hydrogen Systems", national conference
Место публикации : Carbon Nanomaterials in Clean-Energy Hydrogen Systems: Proceedings of the NATO Advanced Research Workshop on Using Carbon Nanomaterials in Clean-Energy Hydrogen Systems Sudak, Crimea, Ukraine 22–28 September 2007/ red. Baranowski, B.; Zaginaichenko, S.; Schur, D.; Skorokhod, V.; Veziroglu, A.: Springer, 2008. - С. 603-610. - (SNATO Science for Peace and Security Series Subseries: NATO Science for Peace and Security Series C: Environmental Security). - ISBN 1874-6519, DOI 10.1007/978-1-4020-8898-8_75
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasilyeva I. G., Dovlitova L. S., Zaikovskii V. I., Malakhov V. V., Edel'man I. S., Stepanov A. S., Aleksandrov K. S.
Заглавие : Actual composition and structure of manganese ferrite nanoparticles dispersed in the borate glass matrix
Место публикации : Doklady Chemistry. - 2005. - Vol. 401, Is. 1-3. - P.47-50. - ISSN 0012-5008, DOI 10.1007/s10631-005-0029-y
Ключевые слова (''Своб.индексиров.''): boric acid--ferrite--glass--manganese derivative--analytic method--article--chemical composition--chemical structure--nanoparticle--stoichiometry--structure analysis--transmission electron microscopy--x ray analysis
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yehia M. R., Smolyarova T. E., Shabanov A. V., Sushko E. S., Badun G. A., Kudryasheva N. S.
Заглавие : Adaptation of a bacterial bioluminescent assay to monitor bioeffects of gold nanoparticles
Место публикации : Bioengineering. - 2022. - Vol. 9, Is. 2. - Ст.61. - ISSN 2306-5354(eISSN), DOI 10.3390/bioengineering9020061
Примечания : Cited References: 91. - This research was funded by RFBR, N18-29-19003; RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, N20-44-243001; and partly supported by the Program of the Federal Service for Surveillance on Consumer Rights Protection and Human Wellbeing, Fundamental Study 2020–2025 (Russian Federation)
Аннотация: Our current study aimed to adapt a bioluminescent bacteria-based bioassay to monitor the bioeffects of gold nanoparticles (AuNPs). Luminous marine bacteria Photobacterium phosphoreum and AuNPs modified with polyvinylpyrrolidone were employed; low-concentration (≤10−3 g/L) bioeffects of AuNPs were studied. Bioluminescence intensity was used as an indicator of physiological activity in bacteria. Two additional methods were used: reactive oxygen species (ROS) content was estimated with a chemiluminescent luminol method, and bacterial size was monitored using electron microscopy. The bacterial bioluminescent response to AuNPs corresponded to the “hormesis” model and involved time-dependent bioluminescence activation, as well as a pronounced increase in the number of enlarged bacteria. We found negative correlations between the time courses of bioluminescence and the ROS content in bacterial suspensions, demonstrating the relationship between bioluminescence activation and bacterial ROS consumption. The combined effects of AuNPs and a beta-emitting radionuclide, tritium, revealed suppression of bacterial bioluminescent activity (as compared to their individual effects) and a reduced percentage of enlarged bacteria. Therefore, we demonstrated that our bacteria-based bioluminescence assay is an appropriate tool to study the bioeffects of AuNPs; the bioeffects can be further classified within a unified framework for rapid bioassessment.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Edel'man I. S., Sventitsky E. S., Serdyuk A. A., Toropova E. S.
Заглавие : Adsorption and Catalytic Properties of Nanoparticles Fe3O4-Ag in Relation to Various Types of Organic Dyes
Коллективы : "Mechanisms of catalytic reactions", International conference, "Механизмы каталитических реакций", международная конференция, Институт катализа им. Г.К. Борескова Сибирского отделения РАН, Институт органической химии им. Н.Д. Зелинского РАН, Московский государственный университет им. М.В. Ломоносова, Сибирское отделение РАН, Центр компетенций НТИ "Водород как основа низкоуглеродной экономики"
Место публикации : XII lnternational conference "Mechanisms of catalvtic reactions": abstracts. - Novosibirsk, 2024. - Ст.PP-09. - P.174-175. - ISBN 978-5-906376-56-5
Примечания : Библиогр.: 2. - РНФ и Красноярский краевой фонд науки, проект 23-22-10025
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Sokolov A. Е., Svetlitsky E. S., Zharkov S. M., Sukhachev A. L., Lin Ch. R., Chen Yu. Zh.
Заглавие : Adsorption of organic dyes by Fe3O4@C, Fe3O4@C@C, and Fe3O4@SiO2 magnetic nanoparticles
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2023. - Vol. 87, Is. 3. - P.338-342. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873822701192. - ISSN 19349432 (eISSN)
Примечания : Cited References: 17. - This research was funded partly by the Ministry of Science and Higher Education of the Russian Federation, project FWES-2021-0035. Ch. R. Lin and Yu. Zh. Chen thank the National Science and Technology Council of Taiwan for the financial support, MOST no. 110-2112-M-153-005- and no. 108-2923-M-153-001-MY3
Аннотация: Fe3O4@C, Fe3O4@C@C, and Fe3O4@SiO2 core–shell nanoparticles are synthesized via thermal decomposition and coprecipitation. Samples are characterized via X-ray spectroscopy, transmission electron microscopy, and magnetometry. It is shown that the magnetic core of all nanoparticles is nanocrystalline and has crystal parameters corresponding to only one phase of Fe3O4, covered with a uniform shell of amorphous carbon or silicon oxide around 8 nm thick. Special attention is given to adsorption properties of the nanoparticles with respect to four dyes: Methylene blue, Congo Red, Eosin Y, and Rhodamine C. The high selectivity of Fe3O4@C nanoparticles to various dyes is revealed.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivanova O. S., Lin, Chun-Rong, Edelman I. S., Svetlitsky E. S., Sokolov A. Е., Zharkov S. M., Sukhachev A. L., Vorobyev S. A., Petrov D. A., Lin, En-Szu
Заглавие : Adsorption properties and catalytic activity of Fe3O4-Ag nanostructures
Колич.характеристики :12 с
Место публикации : Appl. Surf. Sci. - 2024. - Vol. 665. - Ст.160236. - ISSN 01694332 (ISSN), DOI 10.1016/j.apsusc.2024.160236. - ISSN 18735584 (eISSN)
Примечания : Cited References: 48. - The work is supported by the Russian Science Foundation (project no. 23-22-10025, https://rscf.ru/project/ 23-22-10025/) and by the Krasnoyarsk Regional Fund of Science and Technology Support. The electron microscopy and EDS investigations were conducted in the SFU Joint Scientific Center. Magnetic investigations were carried out in the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS"
Аннотация: The morphology and magnetic properties as well as adsorption capacity and catalytic activity of Fe3O4-Ag nanoparticles synthesized by the solvothermal method were studied in dependence on the duration of the thermolysis process (3, 6, and 8 h). X-ray diffraction, transmission electron microscopy, and energy-dispersive spectroscopy measurements showed that the morphology of nanoparticles changed strongly as the duration of thermolysis increased. At 6 and 8 h duration, Fe3O4 nanocrystals grow and assemble into porous spherical globules with an Ag core (samples 2 and 3). These samples demonstrate high magnetization value and very low coercivity. The adsorption capacity of nanoparticles was studied with respect to two organic dyes: cationic methylene blue (MB) and anionic Congo red (CR). The particles showed preferential adsorption of the cationic dye. High catalytic activity towards four dyes: MB, methyl orange (MO), CR, and Rhodamine C (RhC) at the presence of NaBH4 is the remarkable property of these samples. The rate constant of the catalytic reaction was 1.4 min−1. Simultaneous exposure of CR and MO dyes to nanoparticles and NaBH4 caused their irreversible 100 % degradation while in the case of MB and RhC, a transition to their leuco form occurred.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ranjan, Rajeev, Kirillova, Maria A., Esimbekova, Elena N., Zharkov S. M., Kratasyuk, Valentina A.
Заглавие : Agglomeration behavior of lipid-capped gold nanoparticles
Коллективы : Russian Foundation for Basic Research [16-34-60100]; [0356-2017-0017]
Место публикации : J. Nanopart. Res. - 2018. - Vol. 20, Is. 4. - Ст.107. - ISSN 1388-0764, DOI 10.1007/s11051-018-4215-5. - ISSN 1572-896X(eISSN)
Примечания : Cited References:35. - The research was supported by the Russian Foundation for Basic Research [project no. 16-34-60100] and the state budget allocated to the fundamental research (project no. 0356-2017-0017). The authors thank Prof. Tatiana Volova, Prof. Evgenia Slyusareva, and Ms. Nina Slyusarenko of the Siberian Federal University for their assistance in the zeta potential and zeta-average analysis.
Предметные рубрики: COLORIMETRIC SENSOR ARRAY
OPTICAL-PROPERTIES
AGGREGATION
CANCER
Ключевые слова (''Своб.индексиров.''): gold nanoparticles--ionic interference--agglomeration--stabilization--lipid capping--nanobiotechnology applications
Аннотация: The current investigation deciphers aggregation pattern of gold nanoparticles (AuNPs) and lipid-treated AuNPs when subjected to aqueous sodium chloride solution with increasing ionic strengths (100–400 nM). AuNPs were synthesized using 0.29 mM chloroauric acid and by varying the concentrations of trisodium citrate (AuNP1 1.55 mM, AuNP2 3.1 mM) and silver nitrate (AuNP3 5.3 μM, AuNP4 10.6 μM) with characteristic LSPR peaks in the range of 525–533 nm. TEM analysis revealed AuNPs to be predominantly faceted nanocrystals with the average size of AuNP1 to be 35 ± 5 nm, AuNP2 15 ± 5 nm, AuNP3 30 ± 5 nm, and AuNP4 30 ± 5 nm and the zeta-average for AuNPs were calculated to be 31.23, 63.80, 26.08, and 28 nm respectively. Induced aggregation was observed within 10 s in all synthesized AuNPs while lipid-treated AuNP2 (AuNP2-L) was found to withstand ionic interferences at all concentration levels. However, lipid-treated AuNPs synthesized using silver nitrate and 1.55 mM trisodium citrate (AuNP3, AuNP4) showed much lower stability. The zeta potential values of lipid-treated AuNPs (AuNP1-L-1x/200, − 17.93 ± 1.02 mV; AuNP2-L-1x/200, − 21.63 ± 0.70; AuNP3-L-1x/200, − 14.54 ± 0.90; AuNP3-L-1x/200 − 13.77 ± 0.83) justified these observations. To summarize, AuNP1 and AuNP2 treated with lipid mixture 1 equals or above 1x/200 or 1x/1000 respectively showed strong resistance against ionic interferences (up to 400 mM NaCl). Use of lipid mixture 1 for obtaining highly stable AuNPs also provided functional arms of various lengths which can be used for covalent coupling.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Tyumentseva A. V., Tyutrina E. S., Stolyar S. V., Yaroslavtsev R. N., Velikanov D. A.
Заглавие : Aminated magnetic nanoparticles for epithelial cell separation
Коллективы : International Baltic Conference on Magnetism: focus on nanobiomedicine and smart materials, Балтийский федеральный университет им. И. Канта
Место публикации : 4th International Baltic Conference on Magnetism (IBCM 2021): Book of abstracts. - 2021. - P.208
Примечания : This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research projects No. 20-42-242902 and by the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools (project no. MK-1263.2020.3). We are grateful to the Center of collective use of FRC KSC SB RAS for the provided equipment.
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13.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Tyumentseva A. V., Yaroslavtsev R. N., Stolyar S. V., Komogortsev S. V., Velikanov D. A., Gerasimova Yu. V., Knyazev Yu. V.
Заглавие : Aminated magnetic nanoparticles functionalized with antibodies for cell separation
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. M: Magnetism in biology and medicine. - Ст.M.P10. - P.442-443. - ISBN 978-5-94469-051-7
Примечания : Cited References: 2. - The study was supported by the Russian Science Foundation and the Krasnoyarsk Region Science and Technology Support Fund, grant No. 22-14-20020
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Lin C. -R., Ivanova O. S., Petrov D. A., Sokolov A. Е., Chen Y. -Z., Gerasimova M. A., Zharkov S. M., Tseng Y. -T., Shestakov N. P., Edelman I. S.
Заглавие : Amino-functionalized Fe3O4@SiO2 core-shell magnetic nanoparticles for dye adsorption
Место публикации : Nanomaterials. - 2021. - Vol. 11, Is. 9. - Ст.2371. - ISSN 20794991 (ISSN), DOI 10.3390/nano11092371
Примечания : Cited References: 35. - The authors are thankful for the financial support the Russian Foundation for Basic Research, Grant № 19-52-52002, Ministry of Science and Technology of Taiwan, Grants MOST № 108-2923-M-153-001-MY3 and № 109-2112-M-153-003-, the Russian Foundation for Basic Research with Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, the research project number 19-42-240005: “Features of the electronic structure, magnetic properties and optical excitations in nanocrystals of the multifunctional magnetic chalcogenides Fe3S4 and FeSe”. We thank also the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation, where the Transmission Electron Microscopy studies were carried out
Аннотация: Fe3O4@SiO2 core-shell nanoparticles (NPs) were synthesized with the co-precipitation method and functionalized with NH2 amino-groups. The nanoparticles were characterized by X-ray, FT-IR spectroscopy, transmission electron microscopy, selected area electron diffraction, and vibrating sample magnetometry. The magnetic core of all the nanoparticles was shown to be nanocrystalline with the crystal parameters corresponding only to the Fe3O4 phase covered with a homogeneous amorphous silica (SiO2) shell of about 6 nm in thickness. The FT-IR spectra confirmed the appearance of chemical bonds at amino functionalization. The magnetic measurements revealed unusually high saturation magnetization of the initial Fe3O4 nanoparticles, which was presumably associated with the deviations in the Fe ion distribution between the tetrahedral and octahedral positions in the nanocrystals as compared to the bulk stoichiometric magnetite. The fluorescent spectrum of eosin Y-doped NPs dispersed in water solution was obtained and a red shift and line broadening (in comparison with the dye molecules being free in water) were revealed and explained. Most attention was paid to the adsorption properties of the nanoparticles with respect to three dyes: methylene blue, Congo red, and eosin Y. The kinetic data showed that the adsorption processes were associated with the pseudo-second order mechanism for all three dyes. The equilibrium data were more compatible with the Langmuir isotherm and the maximum adsorption capacity was reached for Congo red.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vorob’ev S. A., Burdakova E. A., Sarycheva A. A., Volochaev M. N., Karacharov A. A., Likhatskii M. N., Mikhlin Y. L.
Заглавие : Analysis of function of copper sulfide nanoparticles as sphalerite flotation activator
Место публикации : J. Min. Sci. - 2021. - Vol. 57, Is. 1. - P.144-153. - ISSN 10627391 (ISSN), DOI 10.1134/S1062739121010154
Примечания : Cited References: 22. - This study was supported by the Russian Science Foundation, project no. 18-17-00135
Аннотация: The authors compare the effect exerted by copper ions and sulphide copper nanoparticles on flotation of Gorevka deposit sphalerite using potassium n-butyl xanthate and in reagent-less regime. Covelline-like colloid particles 4–8 nm in size, obtained in interaction of copper (II) and sulfide ions in aqueous solutions, are characterized using the methods of dynamic light scattering, electron microscopy and diffraction. Sphalerite surface after reaction with copper ions and CuS dispersoid solutions are described by zeta-potential measurements and X-ray photoelectron spectroscopy. It is found that sphalerite flotation after activation with nanoparticles is lower than with copper ion solutions of the same concentrations, and improves with increasing duration of activation and flotation processes. The mechanism of CuS nanoparticles consists in creation of active centers for the collector to attach to, which intensifies the hydrophobic behavior and adsorption of the collector. Moreover, CuS nanoparticles promote formation of a special microrelief of the solid–liquid interface, which ensures rupture of liquid film and attachment of sphalerite particles to air bubbles when they collide.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Serzhantova M. V., Kuzubov A. A.
Заглавие : Analysis of hydrogen adsorption in the bulk and on the surface of magnesium nanoparticles
Коллективы :
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2008. - Vol. 107, Is. 1. - P126-132. - ISSN 1063-7761, DOI 10.1134/S1063776108070121
Примечания : Cited References: 15. - This study was supported financially by the Russian Foundation for Basic Research ( project no. 06-02-16132). The authors are also grateful to the Institute of Computer Modeling of the Siberian Branch of the Russian Academy of Science for providing a cluster computer on which all quantum-chemistry calculations were performed.
Предметные рубрики: MOLECULAR-DYNAMICS
TRANSITION
METALS
Ключевые слова (''Своб.индексиров.''): adsorption--gas adsorption--hydrogen--light metals--magnesium--nonmetals--hydrogen adsorption--magnesium hydrides--magnesium printing plates
Аннотация: The stability of magnesium hydride (MgH (x) ) nanoparticles (x = 0.5,...,2) is investigated using ab initio calculations. It is shown that for a nanoparticle diameter of D similar to 5 nm, the internal pressure becomes lower than 3 kbar; for this reason, the structure of hydride nanoparticles coincides with the structure of this hydride in crystalline form. It is found that the phase of partly saturated MgH (x) hydrides (x 2) must decompose into the phase of pure hcp magnesium and the alpha phase of MgH(2). The frequencies of jumps of hydrogen atoms within the hcp phase of magnesium and in the alpha phase of MgH(2) are calculated; it is shown that slow diffusion of hydrogen in magnesium is due to the large height of potential barriers for motion of hydrogen within MgH(2). To attain high diffusion rates, the structures of Mg(53)Sc and Mg(53)Ti crystals and their hydrides are calculated. It is found that the frequency of jumps of H atoms in Mg(53)ScH(108) near the Sc atoms does not noticeably change as compared to the frequency of jumps in the alpha phase of MgH(2), while the frequency of jumps in Mg(53)TiH(108) near Ti atoms is higher by approximately a factor of 2.5 x 10(6). This means that diffusion in manganese hydride with small admixtures of titanium atoms must be considerably eased. Chemical dissociation of hydrogen molecules on the (0001) surface of hcp magnesium, on the given surface with adjoined individual Ti atoms, and on the surface of a one-layer titanium cluster on the given surface of magnesium is investigated. It is found that dissociation of hydrogen at solitary titanium atoms, as well as on the surface of a Ti cluster, is facilitated to a considerable extent as compared to pure magnesium. This should also sharply increase the hydrogen adsorption rate in magnesium nanoparticles.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasikov A. A., Balaev D. A.
Заглавие : Analysis of magnetization processes in antiferromagnetic nanoparticles in strong pulse fields (Brief review)
Коллективы : Eurasian Symposium “Trends in Magnetism”
Место публикации : J. Exp. Theor. Phys. - 2023. - Vol. 136, Is. 1. - P.97-105. - ISSN 10637761 (ISSN), DOI 10.1134/S1063776123010132. - ISSN 10906509 (eISSN)
Примечания : Cited References: 43. - The authors are grateful to V.L. Kirillov for synthesis of a set of NiO samples, O.N. Mart’yanov for cooperation and discussion of results for NiO nanoparticles, V.P. Ladygina for synthesis of nanoferrihydrite, S.V. Stolyar and R.S. Iskhakov for cooperation and discussion of results for ferrihydrite, and A.D. Balaev, K.A. Shaikhutdinov, and S.I. Popkov for the decisive contribution to the realization of pulse field setup
Аннотация: We present a brief review of investigations and analysis of magnetization curves M(H) for NiO and ferrihydrite antiferromagnetic nanoparticles in external fields up to 250 kOe. For correct interpretation of magnetic properties of systems of antiferromagnetic nanoparticles, it is important to take into account the segment of M(H) dependences, which corresponds to high fields (exceeding 100 kOe). We analyze the regularities in the formation of additional magnetic subsystems in antiferromagnetically ordered nanoparticles due to the influence of size effects. These additional subsystems (the ferromagnetic subsystem associated with uncompensated magnetic moment and the subsystem of surface free spins) are estimated quantitatively. It is shown that antiferromagnetic nanoparticles with a size of 5 nm acquire the properties of “nanomagnets,” which are not inferior to those for iron-oxide ferromagnetic nanoparticles of the same size.
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18.

Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Chepkasov I. V., Popov Z. I.
Заглавие : Analysis of thermal effects on copper nanoparticles synthesized from the gas phase
Коллективы : International scientific conference on radiation-thermal effects and processes in inorganic materials , International Scientific Conference on Radiation-Thermal Effects and Processes in Inorganic Materials (Nov 03-08, 2014; Tomsk, Russia)
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2015. - Vol. 81. - Ст.012033. - , DOI 10.1088/1757-899X/81/1/012033
Примечания : Cited References:14
Предметные рубрики: DEVICES
FILMS
Аннотация: Molecular dynamics method using the tight-binding potential to carry out simulation of ultrafast heating of the synthesized particles from the gas phase to a temperature T= 600K and T= 900K, at which the particles were kept about 10 ns. As a result of the simulation revealed that the method of ultrafast heating the particles to high temperatures virtually eliminates the possibility of a clusters of defective education, but as a result of the heat treatment, the some of investigated particles can disconnect (burst) into smaller clusters.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Chekanova L. A., Gerasimova Y. V., Sokolov A. Е., Iskhakov R. S., Yaroslavtsev R. N., Volochaev M. N., Artemyeva A. S., Cheremiskina E. V., Knyazev Yu. V.
Заглавие : Anisometric iron oxide-based nanoparticles and sols based on them: Preparation and properties
Место публикации : J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 4. - P.971–975. - ISSN 15571939 (ISSN) , DOI 10.1007/s10948-018-4784-7
Примечания : Cited References: 18. - The reported study was carried out with the financial support of the Russian Foundation for Fundamental Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territory Fund for Support of Scientific and Technical Activity in the framework of scientific Projects No. 18-43-243003, No. 17-42-240080 and No. 17-43-240527. The work is supported by the Special Program of the Ministry of Education and Science of the Russian Federation for the Siberian Federal University.
Ключевые слова (''Своб.индексиров.''): nanoparticles and nanorods--chemical preparation--superparamagnetism
Аннотация: We have synthesized magnetic powders of the magnetite-maghemite series by the chemical reaction of the FeSO4 iron salt and the natural arabinogalactan polysaccharide. These particles with a high magnetization value (∼ 300 Gs) represent a mixture of spherical particles and nanorods. Particles of a spherical shape (diameter of ∼ 5–6 nm) show a superparamagnetic behavior at room temperature, while rods with a diameter of ∼ 5 nm and a length of 30 nm are magnetic. We have prepared sol samples based on the nanoparticle aqueous solution of arabinogalactan. Our results on the magnetism of the circular dichroism (MCD) on sol are consistent with the of Mössbauer spectroscopy data.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volova T. G., Shumilova A. A., Shidlovskiy I. P., Nikolaeva E. D., Sukovatiy A. G., Vasiliev A. D., Shishatskaya E. I.
Заглавие : Antibacterial properties of films of cellulose composites with silver nanoparticles and antibiotics
Место публикации : Polym Test. - 2018. - Vol. 65. - P.54-68. - ISSN 01429418 (ISSN), DOI 10.1016/j.polymertesting.2017.10.023
Примечания : Cited References: 61. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund to the research project № 16-43-242024 . The study was supported by the State budget allocated to the fundamental research at the Russian Academy of Sciences (project No AAAA-A17-117013050028-8 ).
Ключевые слова (''Своб.индексиров.''): bacterial cellulose--composites--silver nanoparticles--antibiotics--properties--antibacterial activity
Аннотация: The present study describes production of bacterial cellulose composites with silver nanoparticles and antibiotics and compares their properties. Bacterial cellulose (BC) composites synthesized in the culture of the strain of acetic acid bacterium Komagataeibacter xylinus VKPM B-12068 with silver nanoparticles, BC/AgNps, were produced hydrothermally, under different AgNO3 concentrations (0.0001, 0.001, and 0.01 M) in the reaction medium. The presence of silver in the BC/AgNp composites was confirmed by elemental analysis conducted using scanning electron microscopy with a system of X-ray spectral analysis. Analysis showed that the average atomic number of silver particles in composite samples depended on the concentration of AgNO3: as AgNO3 concentration in the reaction solution was increased, silver content in the composites increased from 0.044 to 0.37 mg/cm2. BC composites with amikacin and ceftriaxone were prepared by immersing dry BC films in solutions containing different concentrations of the antibiotics. The surface structure and properties and physicochemical and mechanical characteristics of composites were investigated using SEM, DSC, X-ray analysis, the system for measuring water contact angles, and electromechanical tensile testing machine. The disk-diffusion method and the shake-flask culture method used in this study showed that all experimental composites had pronounced antibacterial activity against E. coli, Ps. eruginosa, K. pneumoniae, and St. aureus, and the BC/antibiotic composites were more active than BC/AgNp ones; S. aureus was the most susceptible to the effect of BC composites. No potential cytotoxicity was detected in any of the BC/AgNp composites in the NIH 3T3 mouse fibroblast cell culture, in contrast to the BC/antibiotic composites. These results suggest that BC composites constructed in the present study hold promise as dressings for managing wounds, including contaminated ones.
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