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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasikov A. A., Balaev D. A., Balaev A. D., Stolyar S. V., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие : Separating the contributions of the magnetic subsystems in antiferromagnetic ferrihydrite nanoparticles by analyzing the magnetization in fields of up to 250 kOe
Колич.характеристики :8 с
Место публикации : J. Magn. Magn. Mater. - 2024. - Vol. 592. - Ст.171781. - ISSN 03048853 (ISSN), DOI 10.1016/j.jmmm.2024.171781. - ISSN 18734766 (eISSN)
Примечания : Cited References: 84. - This study was supported by his work was supported by the Russian Science Foundation, project no. 22–72-00134Authors thank to D.A. Velikanov, S.V. Komogortsev for fruitful discussions
Аннотация: Contributions of different magnetic subsystems formed in the systems of synthetic ferrihydrite nanoparticles (characterized previously) with an average size of ˂d˃ ≈ 2.7 nm coated with polysaccharide arabinogalactan in different degrees have been separated by measuring the dependences of their magnetization M on magnetic field H of up to 250 kOe on vibrating sample and pulsed magnetometers. The use of a wide measuring magnetic field range has been dictated by the ambiguity in identifying a linear M(H) portion for such antiferromagnetic nanoparticle systems within the conventional field range of 60–90 kOe. The thorough analysis of the magnetization curves in the temperature range of 100–250 K has allowed the verification of the contributions of (i) uncompensated magnetic moments µun in the superparamagnetic subsystem, (ii) the subsystem of surface spins with the paramagnetic behavior, and (iii) the antiferromagnetic susceptibility of the antiferromagnetically ordered ferrihydrite particle core. As a result, a model of the magnetic state of ferrihydrite nanoparticles has been proposed and the numbers of spins corresponding to magnetic subsystems (i)–(iii) have been estimated. An average magnetic moment μun of ∼ 145 μB (μB is the Bohr magneton) per particle corresponds approximately to 30 decompensated spins of iron atoms in a particle (about 3 % of all iron atoms), which, according to the Néel’s hypothesis μun ∼ ˂d˃3/2, are localized both on the surface and in the bulk of an antiferromagnetically ordered particle. The fraction of free (paramagnetic) spins is minimal in the sample without arabinogalactan coating of the nanoparticle surface (7 %) and is attained 20 % of all iron atoms in the sample with the highest degree of spatial separation of particles. According to this estimation, paramagnetic spins are located mainly on the edges and protruding areas of particles. Most magnetic moments of iron atoms are ordered antiferromagnetically and the corresponding magnetic susceptibility of this subsystem behaves as in an antiferromagnet with the randomly distributed crystallographic axes, i.e., increases with temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Knyazev Yu. V., Yaroslavtsev R. N., Velikanov D. A., Mikhlin Yu. L., Volochaev M. N., Bayukov O. A., Ladygina V. P., Stolyar S. V., Iskhakov R. S.
Заглавие : Magnetic collective state formation upon tuning the interparticle interactions in ensembles of ultrafine ferrihydrite nanoparticles
Колич.характеристики :13 с
Место публикации : Nano-Struct. Nano-Objects. - 2024. - Vol. 37. - Ст.101089. - ISSN 2352507X (ISSN), DOI 10.1016/j.nanoso.2023.101089. - ISSN 23525088 (eISSN)
Примечания : Cited References: 93. - The authors thank M.N. Volochaev for the TEM investigations
Аннотация: The results of a study of the dynamic (alternating current magnetic susceptibility) and static magnetic properties, as well as 57Fe Mössbauer spectrometry and ferromagnetic resonance of two-line ferrihydrite nanoparticle systems with varying intensities of magnetic interparticle interactions are reported. The strength of the magnetic interparticle interactions has been tuned by coating (with various degrees of coating) the ferrihydrite particles (2–4 nm in size and an average size ∼2.7 nm) of the initial synthetic sample by arabinogalactan. Also, a biogenic ferrihydrite sample (an average particle size of 2-nm) with a natural organic coating was studied and it has the weakest magnetic interparticle interactions among of all the samples. Relaxation times of the particle’s magnetic moment were determined by the data of static and dynamic magnetic susceptibilities and from analysis of 57Fe Mössbauer spectrometry. Based on the temperature dependences of the relaxation times, it has been concluded that the predominantly collective processes of freezing of the particle magnetic moments occur under the action of the magnetic interparticle interactions. It is shown that an important role in these processes is played by a magnetic subsystem of the surface spins of the particles. The effect of the interplay between the surface spin and magnetic moment subsystems on the static magnetic properties (low-temperature magnetic hysteresis loops) and the parameters of the microwave absorption line under the magnetic resonance conditions is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shadrin K. V., Yakovleva Yu. A., Kryukova O. V., Makarskaya G. V., Tarskikh S. V., Pyankov V. F., Pakhomova V. G., Gerasimova Yu. V., Yaroslavtsev R. N., Vorobyev S. A., Stolyar S. V.
Заглавие : Influence of arabinogalactan-coated selenium nanoparticles on the formation of free radicals in Ehrlich ascites carcinoma cells
Колич.характеристики :8 с
Место публикации : BioNanoScience. - 2024. - Vol. 14, Is. 1. - P.268-275. - ISSN 21911630 (ISSN), DOI 10.1007/s12668-023-01251-6. - ISSN 21911649 (eISSN)
Примечания : Cited References: 40
Аннотация: The antioxidant properties of selenium nanoparticles coated with arabinogalactan have been studied. The nanoparticles were characterized by transmission electron microscopy and infrared spectroscopy. Arabinogalactan-coated selenium nanoparticles were incubated together with Ehrlich ascitic carcinoma cells and then exposed to microwave radiation. The antioxidant properties of selenium nanoparticles were evaluated using chemiluminescent analysis. The viability of Ehrlich ascitic carcinoma cells under microwave irradiation and incubation with selenium nanoparticles was assessed by flow cytometry. Under conditions of exposure to experimental tumor cells of microwave radiation, the concentration of free radicals in the cells did not change. The effect of arabinogalactan-coated selenium nanoparticles on tumor cells is expressed as an increase in the delay time for the activation of the antioxidant system.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yaroslavtsev R. N., Tyumentseva A.V., Velikanov D. A., Vazhenina I. G., Volochaev M. N., Stolyar S. V.
Заглавие : Fe3O4/Au nanocomposites: Characterization and cytotoxicity effects in vitro
Колич.характеристики :8 с
Место публикации : Mater. Chem. Phys. - 2024. - Vol. 322. - Ст.129524. - ISSN 02540584 (ISSN), DOI 10.1016/j.matchemphys.2024.129524. - ISSN 18793312 (eISSN)
Примечания : Cited References: 44
Аннотация: Magnetic nanocomposites containing iron oxide and gold components take great attention last years because of their relative biocompatibility and the ability to combine the magnetic properties of iron and the chemical bonding properties of gold for the possible drug delivery or diagnostics for various diseases. However, such particles have some toxicity to living cells, and the effect depends on many factors, including size, shape, the ratio of components in the composites, and the type of cells affected. And thus, the search for compositions and technologies for producing iron-gold particles with improved properties and reduced cytotoxicity remains relevant. The aim of the study was to synthesize and characterize Fe3O4/Au nanocomposites and evaluate their influence on living cells using the example of cell line HEK293. Fe3O4 nanoparticles (NPs) were synthesized by co-precipitation of Fe2+/Fe3+ water solution in alkaline conditions and then boiled with HAuCl4 in 0.1 M sodium citrate. The NPs properties were estimated by transmission electron microscopy (TEM), vibration magnetometry and ferromagnetic resonance (FMR). According to magnetometric measurements, nanoparticles are mainly in a superparamagnetic state. By fitting magnetization curves, the magnetic characteristics of nanoparticles were determined: saturation magnetization (59.3 emu/g) and magnetic anisotropy constant (K = 0.86·105 erg/cm3). The average particle size estimated from magnetic measurements was 8.7 nm. Considering the presence of a magnetically dead layer, this is in good agreement with the TEM results. The temperature dependence of the FMR linewidth was analyzed using two models. As a result, the parameters MSV and K/MS were determined. The models used showed good agreement. The values of the anisotropy constant (K = 1.06·105 erg/cm3) and the average particle size (6.8 nm) are estimated. The effect of the NPs on the HEK293 cells was studied by MTT-assay, flow cytometry and RT-PCR. The exposure with the NPs lead to a significant decrease of cell metabolic activity in HEK293 cell culture, but this effect was not accompanied by cell death. It was shown that the expression of antioxidant enzymes SOD1 and GPX1 was reduced at the mRNA stage. So the NPs synthesized may affect gene expression and metabolism of HEK293 cells, but this does not have fatal consequences for cell viability.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ярославцев, Роман Николаевич, Тюменцева А. В., Волочаев, Михаил Николаевич, Герасимова, Юлия Валентиновна, Великанов, Дмитрий Анатольевич, Столяр, Сергей Викторович
Заглавие : Синтез и свойства пэгилированных наночастиц оксида железа для биомедицинских применений
Коллективы : "Нанофизика и наноэлектроника", международный симпозиум, Министерство науки и высшего образования Российской Федерации, Научный совет РАН по физике конденсированных сред, Научный совет РАН по физике полупроводников, Институт физики микроструктур РАН, Нижегородский государственный университет им. Н.И. Лобачевского
Место публикации : Нанофизика и наноэлектроника: Труды XXVIII Международного симпозиума : в 2-х т. - Нижний Новгород, 2024. - Т. 1, Секция: Магнитные наноструктуры. - С. 432-433. - ISBN 978-5-8048-0123-7
Примечания : Библиогр.: 3. - Выполнено в рамках госзадания ФИЦ КНЦ СО РАН
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Красиков, Александр Александрович, Балаев, Дмитрий Александрович, Столяр, Сергей Викторович, Ярославцев, Роман Николаевич, Балаев, Александр Дмитриевич, Исхаков, Рауф Садыкович
Заглавие : Определение вклада магнитных подсистем, формирующихся в наноразмерных частицах ферригидрита, из анализа кривых намагничивания в полях до 250 кЭ
Коллективы : "Нанофизика и наноэлектроника", международный симпозиум, Министерство науки и высшего образования Российской Федерации, Научный совет РАН по физике конденсированных сред, Научный совет РАН по физике полупроводников, Институт физики микроструктур РАН, Нижегородский государственный университет им. Н.И. Лобачевского
Место публикации : Нанофизика и наноэлектроника: Труды XXVIII Международного симпозиума : в 2-х т. - Нижний Новгород, 2024. - Т. 1, Секция: Магнитные наноструктуры. - С. 270-271. - ISBN 978-5-8048-0123-7
Примечания : Библиогр.: 10. - РНФ № № 22-72-00134
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Столяр, Сергей Викторович, Чеканова, Лидия Александровна, Денисова, Елена Александровна, Ярославцев, Роман Николаевич, Черемискина, Елена Владимировна, Немцев, Иван Васильевич, Исхаков, Рауф Садыкович, Важенина, Ирина Георгиевна, Сухов Б. Г.
Заглавие : Структура и магнитные свойства кобальт-никелевых сплавов,полученных методом химического осаждения в форме покрытий и пленок с использованием арабиногалактана в качестве восстанавливающего агента
Коллективы : "Нанофизика и наноэлектроника", международный симпозиум, Министерство науки и высшего образования Российской Федерации, Научный совет РАН по физике конденсированных сред, Научный совет РАН по физике полупроводников, Институт физики микроструктур РАН, Нижегородский государственный университет им. Н.И. Лобачевского
Место публикации : Нанофизика и наноэлектроника: Труды XXVIII Международного симпозиума : в 2-х т. - Нижний Новгород, 2024. - Т. 1, Секция: Магнитные наноструктуры. - С. 188-189. - ISBN 978-5-8048-0123-7
Примечания : Библиогр.: 14. - Выполнено в рамках госзадания ФИЦ КНЦ СО РАН
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Красиков, Александр Александрович, Князев, Юрий Владимирович, Балаев, Дмитрий Александрович, Столяр, Сергей Викторович, Ярославцев, Роман Николаевич, Михлин, Юрий Леонидович, Исхаков, Рауф Садыкович
Заглавие : Магнитные межчастичные взаимодействия и температура суперпарамагнитной блокировки порошковых систем ферригидрита с различной степенью покрытия наночастиц
Коллективы : "Нанофизика и наноэлектроника", международный симпозиум, Министерство науки и высшего образования Российской Федерации, Научный совет РАН по физике конденсированных сред, Научный совет РАН по физике полупроводников, Институт физики микроструктур РАН, Нижегородский государственный университет им. Н.И. Лобачевского
Место публикации : Нанофизика и наноэлектроника: Труды XXVII Международного симпозиума : в 2-х т. - Нижний Новгород, 2023. - Т. 1. Секция "Магнитные наноструктуры". - С. 223-224. - ISBN 978-5-8048-0120-6
Примечания : Библиогр.: 10. - Исследования проведены при поддержке РНФ, проект № 22-72-00134 «Проявление поверхностных, размерных эффектов и магнитных межчастичных взаимодействий в магнитных свойствах порошковых систем наночастиц ферригидрита» (https://rscf.ru/ project/22-72-00134/)
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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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasikov A. A., Knyazev Yu. V., Balaev D. A., Velikanov D. A., Stolyar S. V., Mikhlin Yu. L., Yaroslavtsev R. N., Iskhakov R. S.
Заглавие : Interparticle magnetic interactions and magnetic field dependence of superparamagnetic blocking temperature in ferrihydrite nanoparticle powder systems
Место публикации : Phys. B: Condens. Matter. - 2023. - Vol. 660. - Ст.414901. - ISSN 09214526 (ISSN), DOI 10.1016/j.physb.2023.414901. - ISSN 18732135 (eISSN)
Примечания : Cited References: 66. - This study was supported by his work was supported by the Russian Science Foundation, project no. 22-72-00134
Аннотация: In this study, nanoparticles of initial synthetic ferrihydrite have been coated with arabinogalactan. The synthesized series of samples with different degrees of coverage of particles has been characterized by X-ray photoelectron spectroscopy, Mossbauer spectroscopy, transmission electron microscopy and magnetometry. The superparamagnetic blocking temperature decreases monotonically with an increase in the degree of coverage of ferrihydrite particles, which is unambiguously related to the different role of the interparticle magnetic interactions in the investigated powder systems. Analysis of the field dependence of the blocking temperature within the random anisotropy model has shown that an increase in the degree of coverage of ferrihydrite particles leads to a decrease in the size of a cluster in which the behaviors of the nanoparticle magnetic moments are correlated. The results obtained have shown the possibility of effective control of the strength of magnetic interparticle interactions in powder ferrihydrite systems by coating nanoparticles with arabinogalactan.
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11.

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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12.

Вид документа : Однотомное издание
Шифр издания : Описание изобретения к патенту 2794889!-075294122
Автор(ы) : Красицкая, Василиса Валерьевна, Кудрявцев, Александр Николаевич, Столяр, Сергей Викторович, Ярославцев, Роман Николаевич, Герасимова, Юлия Валентиновна, Великанов, Дмитрий Анатольевич, Баюков, Олег Артемьевич, Чеканова, Лидия Александровна, Франк, Людмила Алексеевна
Заглавие : Магнитный аффинный сорбент для выделения рекомбинантных белков .-
Коллективы : Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук", Федеральная служба по интеллектуальной собственности (Роспатент), Федеральный институт промышленной собственности
Место публикации : Изобретения. Полезные модели: офиц. бюл. Фед. службы по интеллектуал. собственности (Роспатент). - 2023. - № 12
Аннотация: Настоящее изобретение относится к магнитномуаффинномусорбентудлявыделения рекомбинантных белков, характеризующемуся тем, что состоит из крахмал-активированных магнитных наночастиц оксида железа со средним размером 11,5 нм, значением намагниченности насыщения при комнатной температуре 29,8 эме/ г, температурой блокировки, близкой к комнатной температуре, один грамм которых позволяет выделить 100-590 мг рекомбинантных МВР содержащих гибридных белков из лизата клеток E.coli. Настоящее изобретение обеспечивает повышение удельной сорбционной емкости магнитного аффинного сорбента, представляющегособойкрахмал-активированные магнитные наночастицы оксида железа. 2 табл., 5 ил.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Столяр, Сергей Викторович, Чеканова, Лидия Александровна, Черемискина Е. В., Ярославцев, Роман Николаевич, Таран О. П., Боровкова В. С., Маляр Ю. Н., Незнахин Д. С., Комогорцев, Сергей Викторович
Заглавие : Получение покрытий переходных металлов в присутствии арабиногалактана
Место публикации : Изв. РАН. Сер. физич. - 2022. - Т. 86. № 5. - С. 711-715. - ISSN 0367-6765, DOI 10.31857/S036767652205026X
Примечания : Библиогр.: 19. - Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края и Красноярского краевого фонда науки (проект № 20-43-240003)
Аннотация: Методом химического осаждения в присутствии арабиногалактана получены покрытия переходных металлов (Fe, Co, Ni), содержащие углерод. Определена кристаллическая структура и химический состав покрытий. Методами магнитометрии, рентгеновской дифракции установлено, что углерод не входит в кристаллическую решетку металла, а присутствует в виде графитовых включений. Исследован процесс деградации арабиногалактана в щелочной среде на поверхности гальванической пары.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Vazhenina I. G., Yaroslavtsev R. N., Chekanova L. A., Cheremiskina E., Mikhlin Y.
Заглавие : Magnetic composite coatings FeC and NiC synthesized with arabinogalactan
Место публикации : IEEE Magn. Lett. - 2022. - Vol. 13. - Ст.2503505. - ISSN 1949307X (ISSN), DOI 10.1109/LMAG.2022.3164631
Примечания : Cited References: 23. - This work was supported by Russian Foundation for Basic Research, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science under Project 20-42-240010. The authors thank the Center of Collective Use of the Federal Research Center, Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences for the provided equipment
Аннотация: In this work, we investigated the ferromagnetic resonance spectra of metal/carbon composite coatings. FeC and NiC coatings were synthesized by electroless deposition using polysaccharide arabinogalactan. An analysis of the angular dependences of the resonance field showed that the coatings consist of three magnetic phases separated by a nonmagnetic phase of carbon.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Chekanova L. A., Cheremiskina E. V., Yaroslavtsev R. N., Taran O. P., Borovkova V. S., Malyar Y. N., Neznakhin D. S., Komogortsev S. V.
Заглавие : Synthesis of transition metal coatings using arabinogalactan
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2022. - Vol. 86, Is. 5. - P.597-600. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873822050264
Примечания : Cited References: 19. - The study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Regional Science Foundation (project no. 20-43-240003)
Аннотация: Carbon-containing transition metal (Fe, Co, Ni) coatings are synthesized via chemical deposition with arabinogalactan. The crystal structure and chemical composition of the coatings are determined. Data from magnetometry and X-ray diffraction show that carbon is not included in the crystal lattice of a metal. Instead, it exists in the form of graphite inclusions. Degradation of arabinogalactan in an alkaline medium on the surface of a galvanic pair is investigated.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Balaev D. A., Ladygina V. P., Yaroslavtsev R. N., Knyazev Yu. V., Balasoiu M., Kolenchukova O. A., Iskhakov R. S.
Заглавие : Ferrihydrite nanoparticles produced by Klebsiella oxytoca: Structure and properties dependence on the cultivation time
Место публикации : Adv. Powder Technol. - 2022. - Vol. 33, Is. 8. - Ст.103692. - ISSN 09218831 (ISSN), DOI 10.1016/j.apt.2022.103692
Примечания : Cited References: 59. - 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. 20-416-242907
Аннотация: Ferrihydrite nanoparticles were synthesized using Klebsiella oxytoca microorganisms under various cultivation conditions. The cultivation of bacteria was carried out under various lighting conditions, and the duration of cultivation varied from 3 to 56 days. Biogenic ferrihydrite nanoparticles were studied by Mössbauer spectroscopy, magnetometry, and small-angle X-ray scattering. The process of formation of ferrihydrite nanoparticles and the states arising during the cultivation of microorganisms have been investigated. The results of Mössbauer spectroscopy showed that, depending on the time of cultivation, three different states of ferrihydrite can be realized. States differ both in the ratio of defective and non-defective positions, and the size of the particle. Experimental results indicate that ferrihydrite nanoparticles are a system of variable composition and pass through several structural (or morphological) states during the cultivation of microorganisms. A model of the structure of ferrihydrite nanoparticles is proposed, which consists in the presence of an antiferromagnetic dense core with a high Néel temperature and a friable shell with a significantly lower temperature of magnetic ordering.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Balaev D. A., Stolyar S. V., Krasikov A. A., Bayukov O. A., Volochaev M. N., Yaroslavtsev R. N., Ladygina V. P., Velikanov D. A., Iskhakov R. S.
Заглавие : Interparticle magnetic interactions in synthetic ferrihydrite: Mossbauer spectroscopy and magnetometry study of the dynamic and static manifestations
Место публикации : J. Alloys Compd. - 2022. - Vol. 889. - Ст.161623. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2021.161623
Примечания : Cited References: 84. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 19–42–240012 R-A “Magnetic Resonance in Ferrihydrite Nanoparticles: Effects Related to the Core-Shell Structure”
Аннотация: Samples of synthetic ferrihydrite with an average nanoparticle size of 2.7 nm have been examined by magnetometry and Mossbauer spectroscopy. Ferrihydrite is characterized by the antiferromagnetic interactions between the magnetic moments of iron atoms. In ferrihydrite nanoparticles, as in any other antiferromagnetic ones, structural defects induce the formation of an uncompensated magnetic moment, which determines the magnetic properties typical of single-domain ferro- and ferrimagnetic particles. The manifestation of the magnetic interactions between ferrihydrite nanoparticles in the magnetic properties of the material and in the temperature evolution of Mossbauer spectra has been in focus. The results obtained on synthetic ferrihydrite have been compared with the data for the biogenic ferrihydrite sample with a similar average size of particles surrounded by a polysaccharide shell, which weakens and screens the interparticle magnetic interactions. A clear manifestation of the effect of the interparticle magnetic interactions on the transition to the blocked state is the presence of a significant contribution of the relaxation component in the Mossbauer spectra at temperatures of the transition from the superparamagnetic to blocked state. The temperature dependence of the particle relaxation time obtained from the Mossbauer spectra points out the collective effect of freezing of the magnetic moments of particles due to the magnetic interactions between them.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Stolyar S. V., Knyazev Yu. V., Yaroslavtsev R. N., Pankrats A. I., Vorotynov A. M., Krasikov A. A., Velikanov D. A., Bayukov O. A., Ladygina V. P., Iskhakov R. S.
Заглавие : Role of the surface effects and interparticle magnetic interactions in the temperature evolution of magnetic resonance spectra of ferrihydrite nanoparticle ensembles
Место публикации : Results Phys. - 2022. - Vol. 35. - Ст.105340. - ISSN 22113797 (ISSN), DOI 10.1016/j.rinp.2022.105340
Примечания : Cited References: 119. - Authors thank to A.D. Balaev, S.V. Komogortsev for fruitful discussions and M.N. Volochaev for TEM studies. The TEM study and measurements of X-band FMR spectra were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences. This study was supported by the Russian Science Foundation, project no. 21-72-00025 (https://rscf.ru/project/21-72-00025/) "Tuning the Magnetic Properties of Ultrafine Biocompatible Ferrihydrite Nanoparticles through Interparticle Interactions"
Аннотация: Ferrihydrite is characterized by the antiferromagnetic ordering and, in ferrihydrite nanoparticles, as in nanoparticles of any antiferromagnetic material, an uncompensated magnetic moment is formed. We report on the investigations of ferrihydrite powder systems with an average particle size of ∼ 2.5 nm obtained (i) as a product of the vital activity of bacteria (sample FH-bact) and (ii) by a chemical method (sample FH-chem). In the first approximation, these samples can be considered to be identical. However, in sample FH-chem, particles contact directly, while in sample FH-bact, they have organic shells; therefore, the interparticle magnetic interactions in these samples have different degrees. The main goal of this work has been to establish the effects of the interparticle magnetic interactions and individual characteristics of ferrihydrite nanoparticles on ferromagnetic resonance (FMR) spectra. The FMR spectra have been measured at different (9.4–75 GHz) frequencies in a wide temperature range. It has been found that, at low temperatures, the field-frequency dependence ν(HR) of the investigated systems has a gap ν/γ = HR + HA, where HR is the resonance field and HA is the induced anisotropy, which decreases with increasing temperature. To estimate a degree of the effect of interparticle interactions on the results obtained and to correctly determine the temperature range of the superparamagnetic (or blocked) state, the static magnetic measurement and Mössbauer spectroscopy data have been obtained and analyzed. It has been shown that the most striking feature of the FMR spectra - a gap in the field-frequency dependences - is a manifestation of individual characteristics of ferrihydrite nanoparticles. The induced anisotropy is caused by freezing of a subsystem of surface spins and its coupling with the particle core, which is observed in both samples at a temperature of ∼80 K. The temperature range (below 80 K) in which the gap exists corresponds to the blocked state in the FMR technique. In sample FH-bact, the ratio between the FMR parameters HA and linewidth ΔH obeys the standard expression HA ∼ (ΔH)3. In sample FH-chem, however, the interparticle magnetic interactions dramatically affect the behavior of parameters of the FMR spectra, which change nonmonotonically upon temperature variation. This fact is attributed to the collective freezing of the magnetic moments of particles under the conditions of sufficiently strong interactions, which follows from the temperature dependence of the particle magnetic moment relaxation time determined from the Mössbauer spectroscopy and static magnetometry data obtained in weak magnetic fields.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasitskaya V. V., Kudryavtsev A. N., Yaroslavtsev R. N., Gerasimova Yu. V., Velikanov D. A., Bayukov O. A., Stolyar S. V., Frank L. A.
Заглавие : Starch-coated magnetic iron oxide nanoparticles for affinity purification of recombinant proteins
Место публикации : Int. J. Mol. Sci. - 2022. - Vol. 23, Is. 10. - Ст.5410. - ISSN 16616596 (ISSN), DOI 10.3390/ijms23105410
Примечания : Cited References: 37. - This study was supported by the Russian Science Foundation and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Acitvities, project No. 22-14-20020
Аннотация: Starch-coated magnetic iron oxide nanoparticles have been synthesized by a simple, fast, and cost-effective co-precipitation method with cornstarch as a stabilizing agent. The structural and magnetic characteristics of the synthesized material have been studied by transmission electron microscopy, Mossbauer spectroscopy, and vibrating sample magnetometry. The nature of bonds between ferrihydrite nanoparticles and a starch shell has been examined by Fourier transform infrared spectroscopy. The data on the magnetic response of the prepared composite particles have been obtained by magnetic measurements. The determined magnetic characteristics make the synthesized material a good candidate for use in magnetic separation. Starch-coated magnetic iron oxide nanoparticles have been tested as an affinity sorbent for one-step purification of several recombinant proteins (cardiac troponin I, survivin, and melanoma inhibitory activity protein) bearing the maltose-binding protein as an auxiliary fragment. It has been shown that, due to the highly specific binding of this fragment to the starch shell, the target fusion protein is selectively immobilized on magnetic nanoparticles and eluted with the maltose solution. The excellent efficiency of column-free purification, high binding capacity of the sorbent (100–500 µg of a recombinant protein per milligram of starch-coated magnetic iron oxide nanoparticles), and reusability of the obtained material have been demonstrated.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Komogortsev S. V., Gorbenko A. S., Knyazev Yu. V., Yaroslavtsev R. N., Olkhovskiy I. A., Neznakhin D. S., Tyumentseva A. V., Bayukov O. A., Iskhakov R. S.
Заглавие : Maghemite nanoparticles for DNA extraction: Performance and blocking temperature
Место публикации : J. Supercond. Novel Magn. - 2022. - Vol. 35, Is. 7. - P.1929-1936. - ISSN 15571939 (ISSN), DOI 10.1007/s10948-022-06233-5
Примечания : Cited References: 33. - This work was supported by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund, with research projects no. 20–42-242902. We are grateful to the Center of Collective Use of FRC KSC SB RAS for the provided equipment
Аннотация: Iron oxide nanoparticles coated with polyethylene glycol were synthesized by coprecipitation for use in the magnetic separation of DNA (deoxyribonucleic acid). The blocking temperature of nanoparticles was studied by the methods of Mossbauer spectroscopy, ferromagnetic resonance, and using magnetometric measurements. The blocking temperature calculated from the temperature dependence of the coercive force was ~ 200 K. The calculation of the blocking temperature from the relaxation time obtained using Mossbauer spectroscopy gave a value of ~ 450 K. The blocking temperature obtained using ferromagnetic resonance was ~ 910 K. The relationship between the obtained blocking temperatures is in good agreement with the Neel-Brown formula. The constants of effective and surface anisotropy were determined by the method of ferromagnetic resonance. Isolation of DNA from blood using prepared particles and separation in a permanent magnet field revealed sufficient productivity, high speed, and the “chemical delicacy” of this approach.
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