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Superparamagnetic blocking and magnetic interactions in nanoferrihydrite adsorbed on biomineralized nanorod-shaped F3S4 crystallites / Y. V. Knyazev, O. P. Ikkert, S. V. Semenov [et al.] // J. Alloys Compd. - 2022. - Vol. 923. - Ст. 166346, DOI 10.1016/j.jallcom.2022.166346. - 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 . - ISSN 0925-8388
Кл.слова (ненормированные):
Biomineralization -- Superparamagnetic nanoparticles -- Interparticle interactions -- Iron sulfide -- Ferrihydrite
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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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Department of Plant Physiology, Biotechnology, and Bioinformatics, Tomsk State University, Tomsk, 634050, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Synchrotron radiation facility SKIF, Boreskov Institute of Catalysis SB RAS, Kol'tsovo, 630559, Russian Federation
National Research Center “Kurchatov Institute”, Moscow, 123182, Russian Federation

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Ikkert, O. P.; Semenov, S. V.; Семёнов, Сергей Васильевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Molokeev, M. S.; Молокеев, Максим Сергеевич; Platunov, M. S.; Платунов, Михаил Сергеевич; Khramov, E. V.; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Shestakov, N. P.; Шестаков, Николай Петрович; Smorodina, E. D.; Karnachuk, O. V.; Balaev, D. A.; Балаев, Дмитрий Александрович
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