Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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A. V. Nagornyi^1,2, L. A. Bulavin^1,3, V. I. Petrenko^1,2, O. I. Ivankov^1,2, O. V. Tomchuk^1,2, M. V. Avdeev², L. Vékás<sup>4

1</sup>Taras Shevchenko National University, Kyiv, Ukraine
²Joint Institute for Nuclear Research, Dubna, Moscow region, Russia
³Institute for Safety Problems of Nuclear Power Plants, National Academy of Sciences of Ukraine, Kyiv, Ukraine
⁴Center for Fundamental and Advanced Technical Research, Romanian Academy of Sciences, Timisoara, Romania

Abstract: Results of the structure and interparticle interaction investigations of polar magnetic fluid with different content of magnetite, which are obtained by small-angle neutron scattering (SANS) are presented in the work. The experiment was performed on small-angle scattering spectrometer YuMO at the Pulsed Reactor IBR-2 in the Joint Institute for Nuclear Research (Dubna, Russia). Polar ferrofluid magnetite/oleic and dodecyl-benzenesulfonic acid/isobutanol was considered. It is shown that the experimental SANS curves are well described by form-factor for polydisperse spherical particles only for ferrofluids with magnetite concentration of about 0.5 vol. %. Significant effect of structural factors on the SANS spectra was observed for respectively large concentrations of magnetic material in the volume of ferrofluid. Aggregation of magnetic particles and the molecules of the stabilizer do not occur in the considered concentration range of magnetic material. Experimentally obtained dependences of the effective structure factor as well as the comparison with the theoretical curve calculated for the hard sphere potential in polydisperse approximation are presented in the work.

Keywords: magnetic fluid, ferrofluid, small angle neutron scattering, structure factor, the interparticle interaction.

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