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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Богатиков А. А., Добрецов К. Г., Мелихова М. В., Рожко М. А., Лапина Н. В., Столяр, Сергей Викторович, Ярославцев, Роман Николаевич, Баюков, Олег Артемьевич, Тюменцева А. В., Николаева Е. Д., Тютрина Е. С., Зиновьев Е. В.
Заглавие : Новый способ лечения ожоговых ран с помощью адресной доставки лекарственных веществ магнитным наноносителем (экспериментальная часть)
Место публикации : Журн. СФУ. Биология. - 2022. - Т. 15, № 3. - С. 422-436. - ISSN 19971389 (ISSN), DOI 10.17516/1997-1389-0396; J. Sib. Fed. Univ. Biol. - ISSN 23135530 (eISSN)
Примечания : Библиогр.: 27. - Работа выполнена при финансовой поддержке Красноярского краевого фонда науки, Конкурс проектов организации участия студентов, аспирантов и молодых ученых в конференциях, научных мероприятиях и стажировках (II очередь 2021 года) (проект № 2021051707717)
Аннотация: Проведено экспериментальное исследование на лабораторных животных по изучению эффективности адресной доставки мази левомеколь с помощью магнитных наночастиц и внешнего магнитного поля при термических ожогах. В исследовании принимало участие 20 крыс с двумя очагами ожога. Крысы были разделены на 4 группы: без лечения, терапия с использованием мази левомеколь, лечение с использованием наночастиц, мази левомеколь и внешнего магнитного поля и только магнитотерапии. При гистологическом исследовании на 14-е сутки во всех группах в зоне термического повреждения кожи были отмечены признаки глубокого ожога III и IV степени с распространением некроза на всю глубину дермы и на мышцы. В группе с наночастицами, мазью левомеколь и магнитным полем на фоне уменьшения воспаления отмечалось очаговое появление грануляционной ткани. Таким образом, гистологические исследования ожогового раневого процесса лабораторных животных показали, что использование инновационного биологически активного ранозаживляющего средства на основе наночастиц в сочетании с мазью левомеколь улучшает регенерацию тканей и приводит к ускорению эпителизации, что в целом повышает результаты лечения ожоговой раны. Использование внешнего магнитного поля способствует адресной доставке лечебного нанокомплекса и поддержанию оптимальной концентрации препарата в ране.Experimental studies have been carried out on laboratory animals to investigate the effectiveness of targeted delivery of levomekol ointment using magnetic nanoparticles and an external magnetic field for treatment of thermal burns. The study involved 20 rats, with two burns on each. The rats were divided into 4 groups: untreated; treated with levomekol ointment; treated with levomekol ointment associated with nanoparticles and an external magnetic field; and treated with magnetic field alone. Histological examination was conducted on Day 14, and in all groups, in the thermal burn zone of the skin there were signs of deep three- and four-degree burns with necrosis spread through the dermis, reaching the muscle. In the group with levomekol ointment associated with nanoparticles and magnetic field, inflammation was decreased, and focal granulation tissue formation was observed. Thus, histological studies of the burn wound process in laboratory animals showed that the use of an innovative biologically active wound healing agent based on nanoparticles in combination with the levomecol ointment improved tissue regeneration and accelerated epithelialization, which enhanced the effectiveness of burn wound treatment. The use of an external magnetic field facilitated targeted delivery of the therapeutic nanosystem and maintenance of the optimal concentration of the drug in the wound.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Балаев, Дмитрий Александрович, Дубровский, Андрей Александрович, Красиков, Александр Александрович, Столяр, Сергей Викторович, Исхаков, Рауф Садыкович, Ладыгина, Валентина Петровна, Хилажева Е. Д.
Заглавие : Механизм формирования нескомпенсированного магнитного момента в наночастицах ферригидрита бактериального происхождения
Место публикации : Письма в Журн. эксперим. и теор. физ. - 2013. - Т. 98, Вып. 3. - С. 160-164. - DOI 10.7868/S0370274X13150046
Аннотация: Исследованы магнитные свойства антиферромагнитных (AF) наночастиц ферригидрита FeOOH• nH2O размером 3-7 нм, являющихся продуктом жизнедеятельности бактерий Klebsiella oxitoca. Частицы демонстрируют суперпарамагнитное поведение. Характерная температура блокировки составляет 23 K. Анализ кривых намагничивания показал, что механизмом формирования нескомпенсированного магнитного момента частиц является случайная раскомпенсация магнитных моментов ионов Fe3+ как на поверхности, так и в объеме AF-частицы. При этом реализуется обменная связь между нескомпенсированным магнитным моментом частицы и ее AF "ядром". Установлено, что температурная зависимость нескомпенсированного магнитного момента подчиняется закону {\sim} (1-\text{const}T. ).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Гуревич, Юрий Леонидович, Маньков, Юрий Иннокентьевич, Хлебопрос, Рэм Григорьевич
Заглавие : Самосборка суперпарамагнитных наночастиц ферригидрита
Место публикации : Доклады Академии наук. - 2013. - Т. 453, № 3. - С. 268-271. - DOI 10.7868/S0869565213330098
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Вид документа : Статья из журнала
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Автор(ы) : Vazhenina I. G., Iskhakov R. S., Chekanova L. A.
Заглавие : Spin-wave resonance in chemically deposited Fe-Ni films: measuring the spin-wave stiffness and surface anisotropy constant
Коллективы : Russian Foundation for Basic Research [16-03-00256, 16-03-00969]
Место публикации : Phys. Solid State. - 2018. - Vol. 60, Is. 2. - P.292-298. - ISSN 1063-7834, DOI 10.1134/S1063783418020294. - ISSN 1090-6460(eISSN)
Примечания : Cited References:39. - This study was supported by the Russian Foundation for Basic Research, projects nos. 16-03-00256 and 16-03-00969.
Предметные рубрики: FERROMAGNETIC-RESONANCE
FERRIHYDRITE NANOPARTICLES
LAYERS
Аннотация: Single-layer Fe x Ni1 - x thin magnetic films have been investigated by the spin-wave resonance technique in the entire concentration range. The surface anisotropy and exchange stiffness constants for the films with a Ni content from 30 to 80 at % have been measured from the experimental standing spin wave spectra. The surface exchange spin wave penetration depth δ C = 20–30 nm has been determined from the dependences of the surface anisotropy and exchange coupling constants on the Fe20Ni80 film thickness in the range of 250–400 nm.
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Вид документа : Статья из сборника (однотомник)
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Автор(ы) : Stolyar S. V., Bayukov O. A., Ladygina V. P., Iskhakov R. S., Yaroslavtsev R. N.
Заглавие : Ultrasonic treatment of suspensions of magnetic ferrihydrite nanoparticles
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.P9.14. - P.400. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : References: 1. - This work was supported by the Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation
Ключевые слова (''Своб.индексиров.''): ferrihydrite--magnetic nanoparticles
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Balaev D. A., Yaroslavtsev R. N., Krasikov A. A., Velikanov D. A., Mikhlin Y. L., Volochaev M. N., Bayukov O. A., Stolyar S. V., Iskhakov R. S.
Заглавие : Tuning of the interparticle interactions in ultrafine ferrihydrite nanoparticles
Место публикации : Adv. Nano Res. - 2022. - Vol. 12, Is. 6. - P.605-616. - ISSN 2287237X (ISSN), DOI 10.12989/anr.2022.12.6.605
Примечания : Cited References: 73. - This study was supported by the Russian Science Foundation, project no. 21-72-00025 “Tuning the Magnetic Properties of Ultrafine Biocompatible Ferrihydrite Nanoparticles through Interparticle Interactions” (https://rscf.ru/project/21-72-00025/)
Аннотация: We prepared two samples of ultrafine ferrihydrite (FH) nanoparticle ensembles of quite a different origin. First is the biosynthesized sample (as a product of the vital activity of bacteria Klebsiella oxytoca (hereinafter marked as FH-bact) with a natural organic coating and negligible magnetic interparticle interactions. And the second one is the chemically synthesized ferrihydrite (hereinafter FH-chem) without any coating and high level of the interparticle interactions. The interparticle magnetic interactions have been tuned by modifying the nanoparticle surface in both samples. The coating of the FH-bact sample has been partially removed by annealing at 150℃ for 24 h (hereinafter FH-annealed). The FH-chem sample, vice versa, has been coated (1.0 g) with biocompatible polysaccharide (arabinogalactan) in an ultrasonic bath for 10 min (hereinafter FH-coated). The changes in the surface properties of nanoparticles have been controlled by XPS. According to the electron microscopy data, the modification of the nanoparticle surface does not drastically change the particle shape and size. A change in the average nanoparticle size in sample FH-annealed to 3.3 nm relative to the value in the other samples (2.6 nm) has only been observed. The estimated particle coating thickness is about 0.2-0.3 nm for samples FH-bact and FH-coated and 0.1 nm for sample FH-annealed. Mössbauer and magnetization measurements are definitely shown that the drastic change in the blocking temperature is caused by the interparticle interactions. The experimental temperature dependences of the hyperfine field hf(T) for samples FH-bact and FH-coated have not revealed the effect of interparticle interactions. Otherwise, the interparticle interaction energy Eint estimated from the hf(T) for samples FH-chem and FH-annealed has been found to be 121kB and 259kB, respectively.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Bopp V. L., Mistratova N. A., Petrakovskaya E. A., Teremova M. I., Gurevich Yu. L.
Заглавие : The use of biogenic nanoparticles of ferrihydrite in the propagation of horticultural crops by cutting
Коллективы : International Scientific Conference on Agribusiness, Environmental Engineering and Biotechnologies
Место публикации : International Scientific Conference on Agribusiness, Environmental Engineering and Biotechnologies (2nd ; 2019 ; 13-14 Nov. ; Krasnoyarsk). IOP Conference Series: Earth and Environmental Science. - 2020. - Vol. 421, Is. 6. - Ст.062014. - , DOI 10.1088/1755-1315/421/6/062014
Примечания : Cited References: 16
Аннотация: The effect of biogenic ferrihydrite nanoparticles on the rhizogenesis of garden plants (Salix ledebouriana, Philadelphus coronarius, Thuja occidentalis, and Cerasus fruticosa) was studied. It was shown that nanoparticles of biogenic ferrihydrite (tested 4 modifications) are biologically active. It is assumed that the mechanism of their influence on the rhizogenesis of the tested plant species is general and is associated with the generation of reactive oxygen species in interaction with endogenous hydrogen peroxide.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bopp V. L., Mistratova N. A., Petrakovskaya E. A., Gurevich Y. L., Teremova M. I., Khlebopros R. G.
Заглавие : The influence of nanoparticles of biogenic ferrihydrite on the rooting of lignified cuttings of the Ledebour willow
Место публикации : Biophysics. - 2018. - Vol. 63, Is. 4. - P.621-628. - ISSN 00063509 (ISSN), DOI 10.1134/S0006350918040036
Примечания : Cited References: 38. - This study was supported by the Russian Foundation for Basic Research, the Government of the Kras-noyarsk krai, and the Krasnoyarsk regional foundation for support of scientific and technical activities under the research project no. 16-48-242158.
Аннотация: The influence of nanoparticles of biogenic ferrihydrite on the root formation of lignified cuttings of the Ledebour willow (Salix ledebouriana Trautv.) was investigated. The rooting of stem cuttings was performed in water using a phytohormone (indoyl-3-acetic acid) and nanoparticles. In comparison with the variants of incubation of cuttings in water and in a solution containing indolyl-3-acetic acid, the number and total length of the adventitious roots after 5 and 15 days of rooting were greatest in the cuttings treated with nanoparticles. In the early period of root development, increased levels of free radicals and intensities of the hyperfine structure lines of Mn2+ cleavage were recorded in the EPR spectra of plant tissues (lenticels of cuttings of treated with nanoparticles). The latter is related to the activity of manganese-containing superoxide dismutase. The response of cuttings to the treatment with nanoparticles was recorded by EPR before manifestation of adventitious root primordium initiation and development.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskii A. A., Bayukov O. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Yaroslavtsev R. N.
Заглавие : The effect of low-temperature heat treatment on the magnetic properties of biogenic ferrihydrite nanoparticles
Коллективы : Ministry of Education and Science of the Russian Federation
Место публикации : Tech. Phys. Lett.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 41, Is. 7. - P.705-709. - ISSN 1063-7850, DOI 10.1134/S1063785015070172
Примечания : Cited References: 12. - This study was supported in part by the Ministry of Education and Science of the Russian Federation in the framework of a federal program for 2014-2016.
Предметные рубрики: BACTERIAL FERRIHYDRITE
MOSSBAUER
Аннотация: We have studied the influence of low-temperature heat treatment (annealing) on the magnetic properties of superparamagnetic nanoparticles of biogenic ferrihydrite. It is established that the proposed treatment leads to an increase in the blocking temperature and magnetic susceptibility of samples. After subsequent exposure in aqueous medium, the magnetic properties of annealed sol remain constant. The character of changes in the magnetic properties of samples studied shows that low-temperature heat treatment allows nanoparticle dimensions to be increased in a controlled way. © 2015, Pleiades Publishing, Ltd.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Popkov S. I., Krasikov A. A., Balaev A. D., Dubrovskiy A. A., Stolyar S. V., Yaroslavtsev R. N., Ladygina V. P., Iskhakov R. S.
Заглавие : Temperature behavior of the antiferromagnetic susceptibility of nanoferrihydrite from the measurements of the magnetization curves in fields of up to 250 kOe
Коллективы : Russian Foundation for Basic Research; Government of Krasnoyarsk region; Krasnoyarsk Regional Foundation of Supporting the Scientific and Scientific-Engineering Activity in the framework of the scientific projects [17-42-240138, 17-43-240527]
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2017. - Vol. 59, Is. 10. - P.1940-1946. - ISSN 1063-7834, DOI 10.1134/S1063783417100031. - ISSN 1090-6460(eISSN)
Примечания : Cited References:45. - This work was supported by the Russian Foundation for Basic Research, the Government of Krasnoyarsk region, the Krasnoyarsk Regional Foundation of Supporting the Scientific and Scientific-Engineering Activity in the framework of the scientific projects nos. 17-42-240138 and 17-43-240527.
Предметные рубрики: FERRIHYDRITE NANOPARTICLES
BACTERIAL FERRIHYDRITE
HYSTERESIS
Аннотация: The cross-breeding problem of the temperature dependence of the antiferromagnetic susceptibility of ferrihydrite nanoparticles is considered. Iron ions Fe3+ in ferrihydrite are ordered antiferromagnetically; however, the existence of defects on the surface and in the bulk of nanoparticles induces a noncompensated magnetic moment that leads to a typical superparamagnetic behavior of ensemble of the nanoparticles with a characteristic blocking temperature. In an unblocked state, magnetization curves of such objects are described as a superposition of the Langevin function and the linear-in-field contribution of the antiferromagnetic “core” of the nanoparticles. According to many studies of the magnetization curves performed on ferrihydrite (and related ferritin) nanoparticles in fields to 60 kOe, dependence χAF(T) decreases as temperature increases, which was related before to the superantiferromagnetism effect. As the magnetic field range increases to 250 kOe, the values of χAF obtained from an analysis of the magnetization curves become lower in magnitude; however, the character of the temperature evolution of χAF is changed: now, dependence χAF(T) is an increasing function. The latter is typical for a system of AF particles with random orientation of the crystallographic axes. To correctly determine the antiferromagnetic susceptibility of AF nanoparticles (at least, ferrihydrite) and to search for effects related to the superantiferromagnetism effect, it is necessary to use in experiments the range of magnetic field significantly higher than that the standard value 60 kOe used in most experiments. The study of the temperature evolution of the magnetization curves shows that the observed crossover is due to the existence of small magnetic moments in the samples.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Ladygina V. P., Boldyreva A. V., Kolenchukova O. A., Vorotynov A. M., Bairmani M. S., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие : Synthesis, Properties, and in vivo Testing of Biogenic Ferrihydrite Nanoparticles
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2020. - Vol. 84, Is. 11. - P.1366-1369. - ISSN 10628738 (ISSN), DOI 10.3103/S106287382011026X
Примечания : Cited References: 12. - The study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk krai, the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 19-42-240012 r_a “Magnetic Resonance in Ferrihydrite Nanoparticles: Effects Associated with the Core–Shell Structure”), and the grant of the President of the Russian Federation for state support of young Russian scientists—Candidates of sciences no. MK-1263.2020.3
Аннотация: A sol containing biogenic ferrihydrite nanoparticles is obtained by cultivating Klebsiella oxytoca microorganisms. Data on the physical properties of the biogenic ferrihydrite and its effect on the organism of laboratory animals are obtained using a model of experimental hemolytic anemia, according to indicators of the functional activity of erythrocytes and morphological descriptions of organs.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Balaev D. A., Skorobogatov S. A., Velikanov D. A., Bayukov O. A., Stolyar S. V., Yaroslavtsev R. N., Iskhakov R. S., Knyazev Yu. V.
Заглавие : Superparamagnetic relaxation in ensembles og ultrasmall ferrihydrite nanoparticles
Коллективы : Байкальская международная конференция "Магнитные материалы. Новые технологии", "Магнитные материалы. Новые технологии", Байкальская международная конференция, "Magnetic materials. New tecnologies", Baikal International Conference, Иркутский государственный университет
Место публикации : Магнитные материалы. Новые технологии: тез. докл. IX Байкал. междунар. конф. BICMM-2023/ чл. прогр. ком.: S. S. Aplesnin [et al.] ; чл. орг. ком. R. S. Iskhakov [et al.]. - Иркутск, 2023. - P.92. - ISBN 978-5-962402178-0
Примечания : Библиогр.: 1
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Ikkert O. P., Semenov S. V., Volochaev M. N., Molokeev M. S., Platunov M. S., Khramov E. V., Dubrovskiy A. A., Shestakov N. P., Smorodina E. D., Karnachuk O. V., Balaev D. A.
Заглавие : Superparamagnetic blocking and magnetic interactions in nanoferrihydrite adsorbed on biomineralized nanorod-shaped F3S4 crystallites
Место публикации : J. Alloys Compd. - 2022. - Vol. 923. - Ст.166346. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2022.166346
Примечания : Cited References: 109. - This study was supported by the Russian Science Foundation, project no. 22-24-00601 (https://rscf.ru/project/22–24–00601/)The electron microscopy and Mössbauer spectroscopy studies were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. We thank Dr. Ivan Nemtsev for the SEM images. The contribution of M. P. (development of methodology of sample preparation for EXAFS measurements) was partially supported by the Russian Ministry of Science and Higher Education via the budget project of SRF SKIF, Boreskov Institute of Catalysis
Аннотация: A composite based on nanorod-shaped greigite (Fe3S4) crystallites with adsorbed ferrihydrite (Fe2O3 ‧ nH2O) nanoparticles has been synthesized. The synthesis has been performed by biomineralization of the bacterial wall of a sulfate-reducing Desulfovibrio sp. A2 bacteria. The phase composition of the synthesized composite has been investigated by X-ray powder and electron diffraction, as well as Fourier-transform infrared, extended X-ray absorption fine structure, and Mössbauer spectroscopy. The magnetic measurement data have shown that the sample under study contains two magnetic phases: multidomain nanorod-shaped greigite and ultrasmall ferrihydrite nanoparticles. The constant atomic fraction of the greigite crystalline phase in the range of 4–300 K (~20%) revealed by Mössbauer spectroscopy is indicative of a blocked magnetic moment of nanorod-shaped Fe3S4. It is shown that nanorod-shaped Fe3S4 crystallites are strongly magnetically bound with adsorbed Fe2O3 ‧ nH2O (Eint ~ 1200kB) nanoparticles. This significantly slows down the superparamagnetic relaxation of the magnetic moments of ferrihydrite nanoparticles. Therefore, the blocking temperature noticeably increases and attains, according to the Mössbauer spectroscopy data, a value of TB = 140 K (the magnetic measurements yield TB = 72 K). The processes of superparamagnetic blocking of the magnetic moments of ferrihydrite nanoparticles manifest themselves in the evolution of the magnetic properties of the investigated sample (a significant increase in the coercivity and remanent magnetization). In support of the Mössbauer spectroscopy data, a sufficiently high superparamagnetic blocking temperature has been established, which discloses the effect of magnetizing of ferrihydrite nanoparticles by coarser greigite formations, analogously to the effect of interparticle magnetic interactions.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Li O. A., Vorotynov A. M., Velikanov D. A., Maksimov N. G., Iskhakov R. S., Ladygina V. P., Shokhrina A. O.
Заглавие : Studying the ferromagnetic resonance heating of an isotropic superparamagnet by the example of biogenic ferrihydrite nanoparticles
Колич.характеристики :4 с
Место публикации : Bull. Russ. Acad. Sci.: Phys. - 2024. - Vol. 88, Is. 4. - P.536-539. - ISSN 10628738 (ISSN), DOI 10.1134/S106287382370627X. - ISSN 19349432 (eISSN)
Примечания : Cited References: 10
Аннотация: Ferrihydrite nanoparticles are synthesized and characterized. The dependences of heating of powders are studied upon pumping by a high-frequency electromagnetic field on a dc magnetic field. It is shown that the experimental dependence of the temperature of particles on a dc magnetic field is consistent with the theory of ferromagnetic resonance for an isotropic superparamagnet.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Ladygina V. P., Ischenko L. A., Iskhakov R. S.
Заглавие : Structure and magnetic properties of biogenic ferrihydrite nanoparticles doped with gadolinium
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2013. - Vol. 6, Is. 3. - P.358-365. - ISSN 1997-1397; Журн. СФУ. Сер. "Математика и физика"
Ключевые слова (''Своб.индексиров.''): ferrihydrite nanoparticle--bacterial culture klebsiela oxytoca--mössbauer spectroscopy--gadolinium doping
Аннотация: Bacterial culture Klebsiella oxytoca was grown in a Lovley medium at various concentrations of gadolinium salt. Biogenic magnetic nanoparticles of ferrihydrite were investigated by Mossbauer spectroscopy and magnetization curves were obtained. The results of structural studies showed that iron Fe(5) takes new position when cultivating is carried out in medium with high concentrations of gadolinium. It was found that gadolinium is fit into the crystal structure of ferrihydrite. These results are consistent with the analysis of the magnetization curves.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balasoiu M., Ischenko L. A., Stolyar S. V., Iskhakov R. S., Raikher Y. L., Kuklin A. I., Soloviov D. V., Kurkin T. S., Aranghel D., Arzumanian G. M.
Заглавие : Structural investigation of biogenic ferrihydrite nanoparticles dispersion
Коллективы :
Место публикации : Optoelectron. Adv. Mater.-Rapid Commun. - 2010. - Vol. 4, Is. 12. - P.2136-2139. - ISSN 1842-6573
Примечания : Cited References: 21. - The financial support from the Grants No.224 it.7 and No.56 it.5 of the Romanian Governmental Plenipotentiary at JINR and the support from the JINR theme No. 04-4-1069-2009/2011 are acknowledged. S.S. Abramchyuk (Advanced Technologies Center, Moscow) for the HRTEM images is acknowledged.
Предметные рубрики: S-LAYER PROTEINS
METAL NANOPARTICLES
BIOLOGICAL SYNTHESIS
BIOSYNTHESIS
MICROORGANISMS
FUNGI
Ключевые слова (''Своб.индексиров.''): bacterial nanoparticles--ferrihydrite--small angle x-ray scattering--high-resolution electron microscopy
Аннотация: Structural properties of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella oxytoca are investigated. Investigations of morphology and size of particles dispersed in water by means of high-resolution transmission electron microscopy and small angle X-ray scattering measurements were performed. By model calculations followed by fitting procedure the structural parameters of a cylinder of radius R = 4.87 +/- 0.02 nm and height L = 2.12 +/- 0.04 nm are obtained.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kichanov S., Pantelica A., Pantelica D., Stolyar S. V., Iskhakov R. S., Aranghel D., Ionescu P., Vladoiu R., Balasoiu M.
Заглавие : Structural and compositional specifications on biogenic ferrihydrite nanoparticles production by Klebsiella oxytoca
Коллективы : Joint Institute for Nuclear Research Project [04-4-1121-2015/2017]; RO-JINR Projects [95/15.02.2016, 96/15.02.2016, 77, 82]; Krasnoyarsk region [17-43-240527]; Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation; RFBR
Место публикации : Rom. Rep. Phys. - 2018. - Vol. 70, Is. 4. - Ст.511. - ISSN 1221-1451. - ISSN 1841-8759(eISSN)
Примечания : Cited References: 17. - This work was supported by the Joint Institute for Nuclear Research Project No. 04-4-1121-2015/2017, and RO-JINR Projects Nos. 95/15.02.2016 and 96/15.02.2016, items 77, 82 and was funded by RFBR and Krasnoyarsk region according to the research project No 17-43-240527. Support by the Special Program for Siberian Federal University of the Ministry of Education and Science of the Russian Federation is acknowledged.
Предметные рубрики: MAGNETIC-PROPERTIES
Ключевые слова (''Своб.индексиров.''): biogenic ferrihydrite--nanoparticles structure--synchrotron radiation--powder diffraction--pixe--pige--rbs
Аннотация: Investigations of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella oxytoca by applying methods of synchrotron radiation powder diffraction, particle-induced X-ray emission (PIXE), proton induced gamma-emission (PIGE) and proton Rutherford backscattering (RBS) are reported and discussed.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bukhtiyarova G. A., Mart'yanov O. N., Yakushkin S. S., Shuvaeva M. A., Bayukov O. A.
Заглавие : State of iron in nanoparticles prepared by impregnation of silica gel and aluminum oxide with FeSO4 solutions
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 4. - P826-837. - ISSN 1063-7834, DOI 10.1134/S1063783410040268
Примечания : Cited References: 27. - This study was supported by the Presidium of the Russian Academy of Sciences within the framework of the Program no. 27 "Principles of Basic Research of Nanotechnologies and Nanomaterials," Project no. 46 "Magnetically Ordered Nanoparticles in Catalytic Systems: Synthesis, Evolution, and Physicochemical Properties."
Предметные рубрики: THERMAL-DECOMPOSITION
BETA-FEOOH
MOSSBAUER
FERRIHYDRITE
EPSILON-FE2O3
FE-2(SO4)(3)
SULFATE
FE-57
Аннотация: The state of iron in nanoparticles prepared by impregnating silica gel and aluminum oxide with iron(II) sulfate solutions has been investigated using Mossbauer spectroscopy. It has been revealed that the state of iron depends on the nature of the support. Iron(III) hydroxysulfate and iron(III) oxysulfate nanoparticles are formed on the surface of silica gel, and iron oxide nanoparticles are formed on the surface of aluminum oxide. An increase in the concentration of iron ions or in the size of iron-containing particles leads to hydration of the nanoparticle surface. The calcination of the samples results in the formation of E -Fe2O3 oxide in a strongly disordered or amorphous state in iron-containing particles on the surface of silica gel.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Balaev D. A., Skorobogatov S. A., Velikanov D. A., Bayukov O. A., Stolyar S. V., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие : Spin dynamics in ensembles of ultrafine ferrihydrite nanoparticles
Место публикации : Phys. Rev. B. - 2023. - Vol. 107, Is. 11. - Ст.115413. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.107.115413. - ISSN 24699969 (eISSN)
Примечания : Cited References: 66. - The electron microscopy study and ac susceptibility measurements were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. This study was supported by the Russian Science Foundation, Project No. 21-72-00025 Tuning the Magnetic Properties of Ultrafine Biocompatible Ferrihydrite Nanoparticles through Interparticle Interactions [66]
Аннотация: Features of the spin dynamics in ensembles of interacting (FH-chem) and weakly interacting (FH-coated) magnetic ultrasmall (‹d› ∼ 2 nm) ferrihydrite nanoparticles have been explored. The dc and ac magnetic susceptibilities [χ'(T ) and χ''(T )] of the investigated samples have been thoroughly measured in a weak magnetic field (2 Oe) around the temperatures of superparamagnetic blocking of the nanoparticle magnetic moments (19 and 50.4 K for FH-coated and FH-chem, respectively, according to the dc magnetization data). It has been shown that the magnetic interactions between nanoparticles induce the formation of the cluster spin-glass state below the superparamagnetic blocking temperature (Tg = 18 and 49.5 K for FH-coated and FH-chem, respectively). It has been found that coating of nanoparticles increases the critical scaling index from zν = 5.9 (FH-chem) to zν = 8.0 (FH-coated). This indicates a general slowdown of the dynamics of correlated spins, which is also expressed as an increase in relaxation time τ0 after switching on the interparticle interactions. We attribute this phenomenon to a consequence of a change in the volume of correlated spins with the increasing size of a cluster of interacting nanoparticles. It has been demonstrated using the simulated χ''(T ) dependence that the dissipation of the magnetic energy occurs in two independent stages. The first stage is directly related to the blocking of the nanoparticle magnetic moments, while the second stage reflects the spin-glass behavior of surface spins and depends strongly on the intensity of the interparticle interactions.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskiy A. A., Semenov S. V., Popkov S. I., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Yaroslavtsev R. N.
Заглавие : Specific features of magnetic properties of ferrihydrite nanoparticles of bacterial origin: A shift of the hysteresis loop
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 2. - P.287-292. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416020050
Примечания : Cited References: 23. - This study was supported by the Ministry of Education and Science of the Russian Federation within the state contract for 2014-2016.
Предметные рубрики: Exchange bias
NiO nanoparticles
Anomalies
Аннотация: The results of the experimental investigation into the magnetic hysteresis of systems of superparamagnetic ferrihydrite nanoparticles of bacterial origin have been presented. The hysteresis properties of these objects are determined by the presence of an uncompensated magnetic moment in antiferromagnetic nanoparticles. It has been revealed that, under the conditions of cooling in an external magnetic field, there is a shift of the hysteresis loop with respect to the origin of the coordinates. These features are associated with the exchange coupling of the uncompensated magnetic moment and the antiferromagnetic “core” of the particles, as well as with processes similar to those responsible for the behavior of minor hysteresis loops due to strong local anisotropy fields of the ferrihydrite nanoparticles. © 2016, Pleiades Publishing, Ltd.
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