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Spherical magnetic nanoparticles fabricated by laser target evaporation / A. P. Safronov [et al.] // AIP Adv. - 2013. - Vol. 3, Is. 5. - Ст. 052135. - P. , DOI 10.1063/1.4808368. - 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. . - ISSN 2158-3226

РУБ Nanoscience & Nanotechnology + Materials Science, Multidisciplinary + Physics, Applied
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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Держатели документа:
RAS, Inst Electrophys, Ekaterinburg 620016, Russia
Urals Fed Univ, Ekaterinburg 620000, Russia
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Univ Basque Country UPV EHU, Dept Elect & Elect, Bilbao 48080, Spain
Univ Basque Country UPV EHU, SGIker, Bilbao 48080, Spain
Univ Maryland, Dept Phys, FMR Grp, College Pk, MD 20742 USA

Доп.точки доступа:
Safronov, A. P.; Beketov, I. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Kurlyandskaya, G. V.; Medvedev, A. I.; Leiman, D. V.; Larranaga, A.; Bhagat, S. M.
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Hierarchical structure investigations of biogenic ferrihydrite samples / M. Balasoiu [et al.] // Rom. J. Phys. - 2010. - Vol. 55, Is. 7-8. - P. 782-789. - Cited References: 21. - The work was accomplished with the financial support of Grant 224/11.04.2008 of Romanian Governmental Plenipotentiary at JINR. . - ISSN 1221-146X

РУБ Physics, Multidisciplinary
Рубрики:
ELECTRON NANODIFFRACTION
   6-LINE FERRIHYDRITE
   SYNTHETIC 2-LINE
   FERROFLUIDS
Кл.слова (ненормированные):
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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Держатели документа:
[Balasoiu, M.] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest, Romania
[Stolyar, S. V.
Iskhakov, R. S.
Ishchenko, L. A.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Raikher, Yu. L.] RAS, Ural Branch, Inst Continuum Media Mech, Perm 614013, Russia
[Balasoiu, M.
Kuklin, A. I.
Orelovich, O. L.
Kovalev, Yu. S.
Arzumanian, G. M.] Joint Inst Nucl Res, Dubna 141980, Russia
[Kurkin, T. S.] RAS, Inst Synthet Polymer Mat, Moscow 117393, Russia
[Stolyar, S. V.
Iskhakov, R. S.] RAS, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
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Доп.точки доступа:
Balasoiu, M.; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Ishchenko, L. A.; Raikher, Y. L.; Kuklin, A. I.; Orelovich, O. L.; Kovalev, Y. S.; Kurkin, T. S.; Arzumanian, G. M.
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