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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Raikher Y. L., Stepanov V. I., Stolyar S. V., Ladygina V. P., Balaev D. A., Ishchenko L. A., Balasoiu M.
Заглавие : Magnetic properties of biomineral particles produced by bacteria Klebsiella oxytoca
Коллективы :
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 52, Is. 2. - P298-305. - ISSN 1063-7834, DOI 10.1134/S1063783410020125
Примечания : Cited References: 29. - This study was supported by the Russian Foundation for Basic Research (project nos. 07-02-96026, 07- 02-96017, and 08-02-00802) and performed within the framework of the Federal Target Program "Research and Research-Pedagogical Personnel of Innovation Russia for 2009-2013."
Предметные рубрики: FERRITIN
NANOPARTICLES
IRON
SUSCEPTIBILITY
FERRIHYDRITE
BEHAVIOR
FINS
Аннотация: Ferrihydrite nanoparticles (2-5 nm in size) produced by bacteria Klebsiella oxytoca in the course of biomineralization of iron salt solutions from a natural medium exhibit unique magnetic properties: they are characterized by both the antiferromagnetic order inherent in a bulk ferrihydrite and the spontaneous magnetic moment due to the decompensation of spins in sublattices of a nanoparticle. The magnetic susceptibility enhanced by the superantiferromagnetism effect and the magnetic moment independent of the magnetic field provide the possibility of magnetically controlling these natural objects. This has opened up the possibilities for their use in nanomedicine and bioengineering. The results obtained from measurements of the magnetic properties of the ferrihydrite produced by Klebsiella oxytoca in its two main crystalline modifications are reported, and the data obtained are analyzed theoretically. This has made it possible to determine numerical values of the magnetic parameters of real biomineral nanoparticles.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balasoiu M., Stolyar S. V., Iskhakov R. S., Ishchenko L. A., Raikher Y. L., Kuklin A. I., Orelovich O. L., Kovalev Y. S., Kurkin T. S., Arzumanian G. M.
Заглавие : Hierarchical structure investigations of biogenic ferrihydrite samples
Коллективы :
Место публикации : Rom. J. Phys. - 2010. - Vol. 55, Is. 7-8. - P.782-789. - ISSN 1221-146X
Примечания : Cited References: 21. - The work was accomplished with the financial support of Grant 224/11.04.2008 of Romanian Governmental Plenipotentiary at JINR.
Предметные рубрики: ELECTRON NANODIFFRACTION
6-LINE FERRIHYDRITE
SYNTHETIC 2-LINE
FERROFLUIDS
Ключевые слова (''Своб.индексиров.''): ferrihydrite nanoparticles--klebsiella oxytoca bacteria--optical microscopy--sem--saxs
Аннотация: Results of observation and preliminary analysis on morphology and structure of ferrihydrite particles produced in vivo by Klebsiella oxytoca bacteria are presented. In particular, optical microscopy, scanning electron microscopy and small angle X-ray scattering in accordance with one another point out the fractal structure of the biomineral particle surface. The effect of the bacteria age (the duration of growth) on the fractal dimension is established and characterized.
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Ladygina V. P., Iskhakov R. S., Ishchenko L. A., Yakovchuk V. Y., Dobretsov K. G., Pozdnyakov A. I., Piksina O. E.
Заглавие : Mossbauer Investigation of Temperature Transformations in Bacterial Ferrihydrite
Разночтения заглавия :авие SCOPUS: Mossbauer investigation of temperature transformations in bacterial ferrihydrite
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 1. - P100-104. - ISSN 1063-7834, DOI 10.1134/S1063783411010306
Примечания : Cited References: 10. - This study was supported by the Federal Agency for Science and Innovation of the Russian Federation within the framework of the Russian Federal Target Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia" for 2009-2013 and the Russian Foundation for Basic Research (project no. 09-04-98038-r_sibir'_a).
Аннотация: Ferrihydrite nanoparticles formed as a result of the microorganism activity have been studied using Mossbauer spectroscopy, X-ray powder diffraction analysis, and X-ray fluorescence analysis. Three positions of trivalent iron with nonoverlapping ranges of quadrupole splittings have been revealed in bacterial ferrihydrite: QS{Fe(3+)(1)} = 0.49-0.83 mm/s, QS{Fe(3+)(2)} = 0.84-1.10 mm/s, and QS{Fe(3+)(3)} = 1.25-1.73 mm/s. It has been experimentally demonstrated that the Fe(3+)(3) positions are the centers of nucleation of the hematite phase in the course of heat treatment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskii A. A., Krasikov A. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Khilazheva E. D.
Заглавие : Mechanism of the formation of an uncompensated magnetic moment in bacterial ferrihydrite nanoparticles
Место публикации : JETP Letters. - 2013. - Vol. 98, Is. 3. - P.139-142. - DOI 10.1134/S0021364013160029
Аннотация: The magnetic properties of antiferromagnetic nanoparticles of FeOOH · nH2O with sizes of 3–7 nm, which are products of vital functions of Klebsiella oxytoca bacteria, have been studied. Particles exhibit a superparamagnetic behavior. The characteristic blocking temperature is 23 K. Analysis of the magnetization curves shows that the mechanism of the formation of the uncompensated magnetic moment of particles is the random decompensation of magnetic moments of Fe3+ ions both on the surface and in the bulk of the antiferromagnetic particle. In this mechanism, the exchange coupling between the uncompensated magnetic moment of the particle and its antiferromagnetic “core” is implemented. It has been found that the temperature dependence of the uncompensated magnetic moment has the form 1 — constT 2.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Ladygina V. P., Ishchenko L. A., Iskhakov R. S.
Заглавие : Biogenic ferrihydrite nanoparticles doped with gadolinium
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 232. - ISBN 978-5-7444-3124-2
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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) : Gurevich Y. L., Mankov Yu.I., Khlebopros R. G.
Заглавие : Self-assembly of superparamagnetic ferrihydrite nanoparticles
Коллективы : Russian Foundation for Basic Research [08-08-00427_a, 10-08-00278_a]; Siberian Branch, Russian Academy of Sciences, Integration project [21]
Место публикации : Dokl. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2013. - Vol. 58, Is. 11. - P.478-481. - ISSN 1028-3358, DOI 10.1134/S1028335813110104
Примечания : Cited References: 15. - This work was supported by the Russian Foundation for Basic Research, project nos. 08-08-00427_a and 10-08-00278_a, and by the Siberian Branch, Russian Academy of Sciences, Integration project no. 21.
Предметные рубрики: CHAINS
CLUSTERS
Аннотация: A study was conducted to estimate the possibility of formation of chains of superparamagnetic nanoparticles of iron oxyhydroxides synthesized in a bacteria culture. The self-assembly of biogenic nanoparticles distinguished by low values of magnetization and small sizes is assumed to proceed due to the forces of magnetic dipole dipole interaction as an initial mechanism of aggregation and exchange-interaction forces, which provide the stability of chains. The microphotographs demonstrate the self-assembly of anisotropic cobalt-doped ferrihydrite nanoparticles in aggregates of ellipsoidal shape with sizes of about 550 × 300 nm and a platelike shape of 50-100 nm thick. The aggregates, in turn, are combined from blocks, which include a restricted number of nanoparticles of about 5 nm in diameter and have the shape of rods of 50-100 × 12 nm in size. The energy of degaussing fields of chains is reasonably high, which forces them to form two and three dimensional structures in which the compensation of such fields is provided.
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10.

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
РИНЦ,
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Balaev D. A., Dubrovskii A. A., Popkov S. I., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Khilazheva E. D., Krasikov A. A.
Заглавие : Magnetic properties of biogenic ferrihydrite nanoparticles
Коллективы : Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism
Место публикации : V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism: abstracts. - Vladivostok: FEFU, 2013. - С. 235. - ISBN 978-5-7444-3124-2
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12.

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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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskii A. A., Semenov S. V., Bayukov O. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Ishchenko L. A.
Заглавие : Magnetic properties and the mechanism of formation of the uncompensated magnetic moment of antiferromagnetic ferrihydrite nanoparticles of a bacterial origin
Коллективы : Ministry of Education and Science of the Russian Federation; Siberian Branch of the Russian Academy of Sciences
Место публикации : J. Exp. Theor. Phys.: Pleiades Publishing, 2014. - Vol. 119, Is. 3. - P.479-487. - ISSN 1063-7761, DOI 10.1134/S1063776114080044. - ISSN 1090-6509
Примечания : Cited References: 42. - This work was supported by the Ministry of Education and Science of the Russian Federation (state contract in 2014-2016) and a program of the Siberian Branch of the Russian Academy of Sciences.
Предметные рубрики: NIO NANOPARTICLES
EXCHANGE BIAS
HYSTERESIS ANOMALIES
FERRITIN
SURFACE
MOSSBAUER
ORDER
SIZE
Аннотация: The magnetic properties of the superparamagnetic ferrihydrite nanoparticles that form as a result of the vital activity of Klebsiella oxytoca bacteria are studied. Both an initial powder with an average number of iron atoms N Fe ∼ 2000–2500 in a particle and this powder after annealing at 140°C for 3 h in air are investigated. The following substantial modifications of the magnetic properties of the ferrihydrite nanoparticles are detected after annealing: the superparamagnetic blocking temperature increases from 23 to 49.5 K, and the average magnetic moment of a particle increases (as follows from the results of processing of magnetization curves). The particles have antiferromagnetic ordering, and the magnetic moment resulting in the superparamagnetism of the system appears due to random spin decompensation inside the particle. For this mechanism, the number of uncompensated spins is proportional to the number of magnetically active atoms raised to the one-half power, and this relation holds true for the samples under study at a good accuracy. The possible causes of the detected shift of magnetic hysteresis loops at low temperatures upon field cooling are discussed.
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskii A. A., Semenov S. V., Bayukov O. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Ishchenko L. A.
Заглавие : Magnetic properties of ferrihydrite nanoparticles of bacterial origin
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2014): 29 June - 3 July 2014 : вook of abstracts. - 2014. - Ст.330PO-J2-8. - P.225. - ISBN 978-5-91978-025-0
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Balaev D. A., Iskhakov R. S., Ishchenko L. A., Ladygina V. P., Yaroslavtsev R. N.
Заглавие : Production and magnetic properties of biogenic ferrihydrite nanoparticles
Коллективы : Ministry of Education and Science of Russian Federation [3072]
Место публикации : J. Optoelectron. Adv. Mater. - 2015. - Vol. 17, Is. 7-8. - P.968-972. - ISSN 1454. - ISSN 18417132(eISSN)
Примечания : Cited References:14. - Support by project No3072 of the basic part of the state task of Ministry of Education and Science of Russian Federation is acknowledged.
Предметные рубрики: FERRITIN
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles--biosynthesis--ferrihydrite--superparamagnetics
Аннотация: In present work the magnetic properties of biomineral ferrihydrite nanoparticles (biomass), produced by Klebsiella oxytoca strain and the nanoparticles obtained by drying the sol (so!), made on the basis of biomineral ferrihydrite nanoparticles have been studied. Ferrihydrite nanoparticles are formed on the surface of the bacterial cell.
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16.

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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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Yaroslavtsev R. N., Stolyar S. V., Balaev D. A., Ladygina V. P., Bayukov O. A., Iskhakov R. S.
Заглавие : Ferrihydrite nanoparticles produced by chemical and biological methods
Коллективы : International Baltic Conference on Magnetism: Focus on Biomedical Aspects , Балтийский федеральный университет им. И. Канта
Место публикации : International Baltic Conference on Magnetism (IBCM-2015): book of abstracts. - 2015. - P.96
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Yaroslavtsev R. N., Bayukov O. A., Vorotynov A. M., Volochaev M. N., Dubrovskiy A. A.
Заглавие : Change in the magnetic properties of nanoferrihydrite with an increase in the volume of nanoparticles during low-temperature annealing
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 58, Is. 9. - P.1782-1791. - ISSN 10637834 (ISSN), DOI 10.1134/S1063783416090092
Примечания : Cited References: 32. - This study was supported by the Ministry of Education and Science of the Russian Federation within the State Task for 2014-2016.
Предметные рубрики: FERRIHYDRITE NANOPARTICLES
BACTERIAL FERRIHYDRITE
FERRITIN
HYSTERESIS
MOSSBAUER
ORIGIN
Аннотация: The results of the investigation into the effect of low-temperature annealing of a powder of nanoparticles of bacterial ferrihydrite on its magnetic properties have been presented. It has been found that an increase in the time (up to 240 h) and temperature (in the range from 150 to 200°C) of annealing leads to a monotonic increase in the superparamagnetic blocking temperature, the coercive force, and the threshold field of the opening of the magnetic hysteresis loop (at liquid-helium temperatures), as well as to an increase in the magnetic resonance line width at low temperatures and in the magnetic susceptibility at room temperature. At the same time, according to the results of the analysis of the Mossbauer spectra, the annealing of ferrihydrite does not lead to the formation of new iron oxide phases. Most of these features are well consistent with the fact that the low-temperature annealing of ferrihydrite causes an increase in the size of nanoparticles, which is confirmed by the results of transmission electron microscopy studies. © 2016, Pleiades Publishing, Ltd.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Krasikov A. A., Dubrovskiy A. A., Popkov S. I., Stolyar S. V., Iskhakov R. S., Ladygina V. P., Yaroslavtsev R. N.
Заглавие : Exchange bias in nano-ferrihydrite
Место публикации : J. Appl. Phys.: American Institute of Physics, 2016. - Vol. 120, Is. 18. - Ст.183903. - ISSN 00218979, DOI 10.1063/1.4967912
Примечания : Cited References: 43. - The authors are grateful to M. Volochaev for measurements and O. A. Bayukov for Mössbauer study.This work was supported in part by the Ministry of Education and Science of the Russian Federation.
Ключевые слова (''Своб.индексиров.''): anisotropy--cooling systems--hysteresis--magnetic fields--magnetic materials--magnetism--nanomagnetics--nanoparticles--particle size--characteristic value--exchange bias--exchange bias effects--external magnetic field--field cooling--high anisotropy--minor hysteresis loop--superparamagnetic blocking--hysteresis loops
Аннотация: We report the results of investigations of the effect of cooling in an external magnetic field starting from the temperature over superparamagnetic blocking temperature TB on the shift of magnetic hysteresis loops in systems of ferrihydrite nanoparticles from ∼2.5 to ∼5 nm in size with different TB values. In virtue of high anisotropy fields of ferrihydrite nanoparticles and open hysteresis loops in the range of experimentally attainable magnetic fields, the shape of hysteresis loops of such objects in the field-cooling mode is influenced by the minor hysteresis loop effect. A technique is proposed for distinguishing the exchange bias effect among the effects related to the minor hysteresis loops caused by high anisotropy fields of ferrihydrite particles. The exchange bias in ferrihydrite is stably observed for particles not less than 3 nm in size or with TB over 40 K, and its characteristic value increases with the particle size. © 2016 Author(s).
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Teremova M. I., Petrakovskaya E. A., Romanchenko A. S., Tuzikov F. V., Gurevich Y. L., Tsibina O. V., Yakubailik E. K., Abhilash
Заглавие : Ferritization of industrial waste water and microbial synthesis of iron-based magnetic nanomaterials from sediments
Коллективы : RFFI [10-08-01278]; DST-RFBR Indo-Russian Long term Collaborative Project [DST-ILTP-A.2.61]
Место публикации : Environ. Prog. Sustain. Energy: Wiley-Blackwell, 2016. - Vol. 35, Is. 5. - P.1407-1414. - ISSN 1944-7442, DOI 10.1002/ep.12368. - ISSN 1944-7450(eISSN)
Примечания : Cited References:26. - The work has been carried out with support of grant of RFFI No 10-08-01278 and DST-ILTP-A.2.61 under DST-RFBR Indo-Russian Long term Collaborative Project. Authors are grateful to P.P. Pustoshilov, N.M. Kuchin, O.A. Bayukov, A.P. Puzyr and Lobova T.I. for assistance in experiment performance and valuable remarks.
Предметные рубрики: ACIDITHIOBACILLUS FERROOXIDANS CELLS
POT MULTICOMPONENT SYNTHESIS
Ключевые слова (''Своб.индексиров.''): industrial wastes--ferritization--bacteria--magnetic--ferrihydrite--nanoparticles
Аннотация: The precipitation of iron and associated heavy metals in industrial waste water and in model solution using ferritization and aerobic bacterial culture was investigated. Magnetic sediments extractable by magnetic separation (specific saturation magnetization of 16–36.8 G cm3/g) were produced by precipitation of iron by ferritization method at рН (8–10) and 60–80°С for 15–30 min. Nanoparticles of ferrihydrite or ferric hydroxide doped with associated metals (Co, Ni) were produced under precipitation of ferric iron in model solution with bacteria at the temperature 26–34°С. The radii of synthesized particles are 1–5 nm and nanoparticles of ferrihydrite are superparamagnetic in both un-doped and doped (Co, Ni, Zn) sets. Dispersed structure of biogenic nanoparticle sols, their magnetic and other properties were studied by atomic force microscopy, X-ray small-angle scattering, X-ray diffraction, electron magnetic resonance, Mössbauer and X-ray photoelectron spectroscopy.
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