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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Safronov A. P., Beketov I. V., Komogortsev S. V., Kurlyandskaya G. V., Medvedev A. I., Leiman D. V., Larranaga A., Bhagat S. M.
Заглавие : Spherical magnetic nanoparticles fabricated by laser target evaporation
Место публикации : AIP Adv.: American Institute of Physics, 2013. - Vol. 3, Is. 5. - Ст.052135. - P. - ISSN 2158-3226, DOI 10.1063/1.4808368
Примечания : Cited References: 47. - This work was supported by the RFBR 10-02-96015 and 12-02-31385 projects, UrFU 215, Spanish MEC MAT2011-27573-C04 grants, Universidad del Pais Vasco UPV/EHU under UFI11/53 action and Physics Department of the University of Maryland visiting grant. Selected measurements were performed at SGIker service of UPV-EHU. We thank O.M. Samatov, Dr. A.M. Murzakayev, Dr. I. Orue, and A.A. Svalova for special support.
Предметные рубрики: IRON-OXIDE NANOPOWDERS
CO2-LASER EVAPORATION
FE3O4 NANOPARTICLES
FINITE-SIZE
TEMPERATURE
FERROMAGNETS
FERROFLUIDS
DEPENDENCE
EXPLOSION
PARTICLES
Аннотация: Magnetic nanoparticles of iron oxide (MNPs) were prepared by the laser target evaporation technique (LTE). The main focus was on the fabrication of de-aggregated spherical maghemite MNPs with a narrow size distribution and enhanced effective magnetization. X-ray diffraction, transmission electron microscopy, magnetization and microwave absorption measurements were comparatively analyzed. The shape of the MNPs (mean diameter of 9 nm) was very close to being spherical. The lattice constant of the crystalline phase was substantially smaller than that of stoichiometric magnetite but larger than the lattice constant of maghemite. High value of M-s up to 300 K was established. The 300 K ferromagnetic resonance signal is a single line located at a field expected from spherical magnetic particles with negligible magnetic anisotropy. The maximum obtained concentration of water based ferrofluid was as high as 10g/l of magnetic material. In order to understand the temperature and field dependence of MNPs magnetization, we invoke the core-shell model. The nanoparticles is said to have a ferrimagnetic core (roughly 70 percent of the caliper size) while the shell consists of surface layers in which the spins are frozen having no long range magnetic order. The core-shell interactions were estimated in frame of random anisotropy model. The obtained assembly of de-aggregated nanoparticles is an example of magnetic nanofluid stable under ambient conditions even without an electrostatic stabilizer. (C) 2013 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
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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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