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Characterization of bio-synthesized nanoparticles produced by Klebsiella oxytoca / L. Anghel [et al.] // Journal of Physics: Conference Series. - 2012. - Vol. 351, Is. 1. - Ст. 012005. - P. , DOI 10.1088/1742-6596/351/1/012005 . - ISSN 1742-6588
Кл.слова (ненормированные):
Absorption peaks -- Biominerals -- Chemical compositions -- Exopolysaccharides -- Ferrihydrites -- Fitting procedure -- FTIR spectroscopy -- Klebsiella oxytoca -- Model calculations -- Morphological analysis -- Radius of gyration -- Scattering objects -- Small angle X-ray scattering -- Structural and morphological properties -- Structural investigation -- UV-vis spectroscopy -- Water dispersion -- Water-dispersed -- Experiments -- Nanoparticles -- Polysaccharides -- Raman spectroscopy -- Scattering -- Ultraviolet visible spectroscopy -- Synthesis (chemical)
Аннотация: Structural and morphological properties of biogenic ferrihydrite nanoparticles produced by bacteria Klebsiella oxytoca are investigated. The stability of water dispersions of biomineral particles produced by Klebsiella oxytoca was monitored by UV-Vis spectroscopy. Their chemical composition was determined by FT-IR spectroscopy. The vibrational spectra of biogenic ferrihydrite nanoparticles revealed typical absorption peaks of exopolysaccharides. Morphological analysis based on Raman spectroscopy indicated the presence of exopolysaccharides on the surface as well as inside the pores of the ferrihydrite nanoparticles. Structural investigations of ultrasonic assisted samples of different concentration of water dispersed particles were performed using small angle X-ray scattering analysis. Model calculations and fitting procedures revealed scattering objects of an elongated shape with 6.73В±0.16 nm radius of gyration. В© Published under licence by IOP Publishing Ltd.

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Доп.точки доступа:
Anghel, L.; Balasoiu, M.; Ishchenko, L. A.; Stolyar, S. V.; Столяр, Сергей Викторович; Kurkin, T. S.; Rogachev, A. V.; Kuklin, A. I.; Kovalev, Yu.S.; Raikher, Yu.L.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Duca, G.; International Workshop on SANS-YuMO User Meeting at the Start-up of Scientific Experiments on the IBR-2M Reactor: Devoted to the 75th Anniversary of Yu M Ostanevich's Birth(2 ; Dubna)(27 May 2011 - 30 May 2011)
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    Effect of Trapped Magnetic Flux on Neutron Scattering in La1.85Sr0.15CuO4 Superconductor / A. A. Bykov [et al.] // J. Supercond. Novel Magn. - 2019. - Vol. 32, Is. 12. - P. 3797-3802, DOI 10.1007/s10948-019-05195-5. - Cited References: 25. - The authors are grateful to G.P. Kopitsa and V.V. Runov for fruitful discussions. - The work is supported by the Russian Science Foundation (project No. 17-72-10067). . - ISSN 1557-1939
   Перевод заглавия: Действие захваченного магнитного потока на нейтронное рассеяние в сверхпроводнике La1.85Sr0.15CuO4
Кл.слова (ненормированные):
Superconductivity -- SANS -- Trapped field -- LSCO
Аннотация: The superconducting La1.85Sr0.15CuO4 ceramics has been studied by small angle neutron scattering, magnetization measurements, and scanning electron microscopy. Experiments have shown that the intensity of the magnetic scattering is 2–3 times higher in the field cooled regime than in the zero-field cooled regime. Additional magnetic heterogeneities due to closure of the trapped magnetic flux cause the excess scattering in the field cooled regime. The isotropic nature of the scattering is associated with the absence of a preferred direction of the Abrikosov vortices, which is caused by the random orientation of the ab planes of the anisotropic superconductor granules.

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Держатели документа:
NRC Kurchatov Institute – PNPI, Gatchina, 188300, Russian Federation
Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Laboratoire Leon Brillouin, CEA, CNRS, Universite Paris-Saclay, CEA Saclay, Gif-sur-Yvette, 91191, France
Saint-Petersburg State University, Ulyanovskaya 1, Saint-Petersburg, 198504, Russian Federation

Доп.точки доступа:
Bykov, A. A.; Gokhfeld, D. M.; Гохфельд, Денис Михайлович; Altynbaev, E. V.; Terent'ev, K. Yu.; Терентьев, Константин Юрьевич; Martin, N.; Semenov, S. V.; Семёнов, Сергей Васильевич; Grigoriev, S. V.
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