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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 8, p.735-741

    Paper

Nagornyi A.V.1,2, Bulavin L.A.1, Petrenko V.I.1,2, Avdeev M.V.2, Aksenov V.L.2,3

1 Taras Shevchenko National University of Kyiv
(2, Academician Glushkov Ave., Kyiv 03022, Ukraine)
2 Joint Institute for Nuclear Research
(6, Joliot-Curie Str., Dubna 141980, Russia; e-mail: avnagorny@jinr.ru)
3 B.P. Konstantinov Petersburg Nuclear Physics Institute
(Orlova Roshcha, Gatchina 188300, Russia)

Sensitivity of Small-Angle Neutron Scattering Method at Determining the Structural Parameters in Magnetic Fluids with Low Magnetite Concentrations

Section: Soft matter
Original Author's Text: Ukrainian

Abstract: The capabilities of the small-angle neutron scattering (SANS) method for the research of various magnetic fluids with low magnetite concentrations (?0.1 vol.%), when the structural factor effect is absent, have been considered. The structural parameters of nanoparticles (the magnetic coherent scattering length density, thickness of a nonmagnetic layer on the surface of magnetic nanoparticles, and thickness of a stabilizing shell), which can be obtained from SANS experiments and the Guinier parameters for the scattering intensity, were analyzed in the framework of the “spherical core–shell” model. The model is found to be sensitive to a variation of the structural parameters of magnetic fluids if the particle polydispersity is taken into account. Experimental conditions for magnetite/oleic acid/benzene (a nonpolar carrier fluid) and magnetite/oleic and dodecyl-benzenesulphonic acids/pentanol (a polar carrier fluid) ferrofluids are selected and compared.

Key words: magnetic fluid system, small-angle neutron scattering, surfactant.