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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Komogortsev S. V., Chekanova L. A., Shabanova O. V., Shabanov A. V., Nemtsev I. V., Neznakhin D. S., Denisova E. A., Felk V. A., Mohov A. A., Iskhakov R. S.
Заглавие : Dipole-dipole interaction weakening in ensembles of cobalt microspheres with a nonmagnetic core
Место публикации : Phys. Solid State. - 2022. - Vol. 64, Is. 9. - P.1263-1268. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2022.09.54163.16HH. - ISSN 10906460 (eISSN)
Примечания : Cited References: 32. - The study was done with financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science within scientific project No. 20-42-240001
Аннотация: Magnetic microspheres with nonmagnetic acrylic glass core were fabricated using electroless deposition. There are favorable conditions for magnetic flux closure within each particle. As a result, the dipole-dipole interaction in the powder of such microspheres is reduced drastically. This is the key difference between powders of magnetic microspheres and powders of full magnetic spherical particles witch behavior is significantly affected by the dipole-dipole interaction. The magnetic hysteresis in the cobalt microspheres with nonmagnetic core is significantly large then in the full cobalt particles produced using the same technique.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabanova O. V., Korshunov M. A., Nemtsev I. V., Shabanov A. V.
Заглавие : Features of self-assembly of opal-like structures based on poly(methyl methacrylate) submicron dispersions
Место публикации : Nanotechnologies Russ.: Maik Nauka-Interperiodica Publishing, 2016. - Vol. 11, Is. 9-10. - P.633-639. - ISSN 19950780 (ISSN), DOI 10.1134/S1995078016050153
Примечания : Cited References: 18. - This work was supported by and carried out on the equipment of the shared facilities of the Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): dispersions--esters--self assembly--aqueous dispersions--narrow size distributions--sub-micron dispersions--sub-micron particles--periodic structures
Аннотация: Features of the formation of periodic 2D and 3D opal-like structures depending on the conditions of deposition have been investigated in this work. The subject of the experiments is aqueous dispersions of poly(methyl methacrylate) submicron particles with a narrow size distribution. The particles are precipitated by sedimentation, centrifugation, and the meniscus method. The samples are studied using electron microscopes. Significant morphological differences in periodic structures obtained by various methods are found. © 2016, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nemtsev I. V., Shabanova O. V., Tambasov I. A., Ivanenko A. A., Cherepakhin A. V., Shestakov N. P., Zyryanov V. Ya.
Заглавие : Methods to determine crystal lattice parameters of opal-like structures
Место публикации : J. Struct. Chem. - 2021. - Vol. 62, Is. 4. - P.641-650. - ISSN 00224766 (ISSN), DOI 10.1134/S0022476621040168
Примечания : Cited References: 45. - The research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (theme No. AAAA-A18-118041990041-8)
Аннотация: Series of high-quality spherical poly(methyl methacrylate) particles with a polydispersity less than 5% are prepared by chain-growth emulsifier-free controlled radical emulsion polymerization of methyl methacrylate in water. The average diameters in the series varied from 237 nm to 447 nm. The physico-chemical properties of obtained submicrospheres can be varied to make them more stable and stronger by a modified classical synthesis technology whereby 4-10 vol.% of dispersion medium is replaced by acetone. 2D and 3D photonic crystal structures, opals, are prepared from poly(methyl methacrylate) submicrospheres. The crystal structure of the opals is studied by IR spectroscopy and scanning electron microscopy. According to the spectroscopic data, the poly(methyl methacrylate) particles contain significant amounts of water whose evaporation leads to the shrinkage of the spheres. The stereoregularity of the synthesized polymer is studied, the glass-transition temperatures of obtained samples are determined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Shabanova O. V., Falaleev O. V.
Заглавие : MRI Comparative Study of Container Geometry Impact on the PMMA Spheres Sedimentation
Место публикации : Appl. Magn. Reson. - 2013. - Vol. 44, Is. 5. - P.619-636. - ISSN 0937-9347, DOI 10.1007/s00723-012-0432-8
Примечания : Cited References: 31
Предметные рубрики: OPAL PHOTONIC CRYSTALS
SUSPENSIONS
PARTICLES
VELOCITY
Аннотация: Nuclear magnetic resonance (NMR) imaging results are presented for the comparative study of sedimentation of the polymethylmethacrylate colloidal suspensions with spherical particle diameters of 475, 350 and 255 nm. The time evolution of the particle volume fraction in the sedimenting system, velocity of the fluid/suspension interface, interface broadening, and sediment growth velocity are measured against the system concentration as well as the container geometry. Using the experimental data the hindered settling function is evaluated. The influence of the container geometry on the parameters defining the hindered settling function in different approaches is evaluated for the first time. The limiting value of the particle diameter is estimated at which the container geometry has no impact any longer. This effect can be explained by the microscale structure persisting at low Peclet numbers. In addition, the influence of the container geometry on interface broadening and sediment formation for different particle diameters and volume fractions is studied. Spontaneous sediment packing induced by a modified container geometry has been found. NMR imaging has proven to be a highly efficient research tool for studying sedimentation at low Peclet numbers.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Morozov E. V., Shabanova O. V., Falaleev O. V.
Заглавие : NMR Imaging application to study colloidal systems of PMMA spheres
Коллективы : Институт химической кинетики и горения им. В.В. Воеводского Сибирского отделения РАН, Международный томографический центр Сибирского отделения РАН, "Magnetic Resonance and Magnetic Phenomena in Chemical and Biological Physics", School for Young Scientists (2012 ; июль ; 16-21; Новосибирск)
Место публикации : School for Young Scientists "Magnetic resonance and magnetic phenomena in chemical and biological physics": Program and Abstracts. - Новосибирск, 2012. - P.46
Аннотация:
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nemtsev I. V., Shabanova O. V.
Заглавие : Manufacturing of opals from polymethylmethacrylate particles in dispersion media with different viscosities
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2021. - Vol. 14, Is. 2. - P.176-183. - ISSN 19971397 (ISSN), DOI 10.17516/1997-1397-2021-14-2-176-183; Журн. СФУ. Матем. и физика. - ISSN 23136022 (eISSN)
Примечания : Cited References: 42. - The study was carried out with the support of the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS". The work was supported by the framework of the state assignment of the Ministry of Science and Higher Education of the Russian Federation (topic no. AAAA-A18-118041990041-8)
Аннотация: The article was prepared based on the materials of the report at the first All-Russian scientific conference with international participation "YENISEI PHOTONICS – 2020". Photonic crystals are structures that have a spatial architecture with a periodically changing complex dielectric function at scales comparable to the wavelengths of light in the visible frequency range. The purpose of this study is to obtain three-dimensional photonic crystals by self-assembly from submicron spherical monodisperse particles of polymethylmethacrylate in dispersion media with different viscosities.Фотонные кристаллы — это структуры, которые имеют пространственную архитектуру с периодически изменяющейся сложной диэлектрической функцией в масштабах, сопоставимых с длинами волн света в видимом диапазоне частот. Целью данной работы является получение трёхмерных фотонных кристаллов путём самосборки из субмикронных сферических монодисперсных частиц полиметилметакрилата в дисперсных средах с различной вязкостью.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Morozov E. V., Shabanova O.V., Pavlov V.F., Falaleev O.V.
Заглавие : NMR microimaging for studying the initial stages of gelation process in colloidal silica
Коллективы : Actual problems of magnetic resonance and its application
Место публикации : Actual problems of magnetic resonance and its application: XII International youth scientific school, Kazan, 5 - 9 October 2009 : program, lecture notes, proceedings : new aspects of magnetic resonance application. - 2009. - С. 121-125
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Nemtsev I. V., Shabanova O. V., Shestakov N. P., Ivanenko A. A., Cherepakhin A. V., Zyryanov V. Ya.
Заглавие : Photonic crystal structures based on submicron particles of polymethyl methacrylate
Коллективы : International Conference on Information Technology and Nanotechnology
Место публикации : J. Phys. Conf. Ser. - 2021. - Vol. 1745: 6th International Conference on Information Technology and Nanotechnology, ITNT 2020 (26 - 29 May 2020, Samara, Russian Federation) Conference code: 167456, Is. 1. - Ст.012024. - DOI 10.1088/1742-6596/1745/1/012024
Примечания : Cited References: 27. - We are grateful to the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS» for the provided equipment. The authors are also grateful to the Russian Foundation for Basic Research for financial support (grant No.18-42-243013)
Аннотация: Morphological parameters, reflection spectra, IR absorption spectra, and glass transition temperatures of submicron-sized spheres of poly(methyl methacrylate) (PMMA) formed in a water-acetone dispersion medium were studied in comparison with similar spheres obtained in distilled water. Dependence of a shrinkage degree of the submicrospheres on the concentration of acetone in water is studied. Features of the formation of periodic structures based on the water-acetone dispersions of PMMA in four different ways are considered. 2D (photonic crystal films) and 3D (artificial and inverse opals) resonance structures were obtained.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Pavlov V. F., Shabanova O. V., Pavlov I. V., Pavlov M. V., Shabanov V. F.
Заглавие : REM-containing silicate concentrates
Коллективы : International symposium on fundamental aspects of rare-earth elements mining and separation and modern materials engineering
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng.: IOP Publishing, 2016. - Vol. 112, Is. 1. - , DOI 10.1088/1757-899X/112/1/012030
Ключевые слова (''Своб.индексиров.''): aluminosilicates--rare earth elements--rare earths--silicates--a-stable--aluminosilicate materials--chemical compositions--complex processing--ferromanganese oxides--mineral acid--rare earth metals--x-ray amorphous--geochemistry
Аннотация: A new method of advanced complex processing of ores containing rare-earth elements (REE) is proposed to obtain porous X-ray amorphous aluminosilicate material with a stable chemical composition which concentrates oxides of rare-earth metals (REM). The ferromanganese oxide ores of Chuktukon deposit (Krasnoyarsk Region, RF) were used for the experiment. The obtained aluminosilicate material is appropriate for treatment with 5 - 15% solutions of mineral acids to leach REM. © Published under licence by IOP Publishing Ltd.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabanov A. V., Shabanova O. V., Korshunov M. A.
Заглавие : Synthesis of monodisperse submicron spherical poly(methylmethacrylate) particles and the molecular dynamics simulation
Место публикации : Colloid J.: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 76, Is. 1. - P.113-119. - ISSN 1061-933X, DOI 10.1134/S1061933X14010128. - ISSN 1608-3067
Примечания : Cited References: 32
Аннотация: The molecular-dynamics method has been used to determine the conformational states of poly(methyl methacrylate) chains in a medium composed of water and a monomer (methyl methacrylate). Experimentally detected spherical particles resulting from polymerization have been found to take the form of droplet-type aggregates containing several chains, with the water and monomer concentrations in the aggregates differing from those in the dispersion medium. It has been shown that the methyl methacrylate concentration in an initial reaction mixture of about 20% is optimal for the formation of spherical droplet-type aggregates. It has been experimentally established that spherical poly(methyl methacrylate) particles with a narrow size distribution are formed at a methyl methacrylate concentration of ≈23%.
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