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Current issue   Ukr. J. Phys. 2014, Vol. 58, N 12, p.1143-1148
doi:10.15407/ujpe58.12.1143    Paper

Bulavin L.A.1, Nagornyi A.V.1,2, Petrenko V.I.1,2, Avdeev M.V.2, Almasy L.3, Rosta L.3, Aksenov V.L.4,2

1 Taras Shevchenko National University of Kyiv, Faculty of Physics
(2, Prosp. Academician Glushkov, Kyiv 03022, Ukraine)
2 Joint Institute for Nuclear Research
(6, Joliot-Curie Str., Dubna 141980, Russia; e-mail: avnagorny@jinr.ru)
3 Institute for Solid State Physics and Optics, Wigner Research Centre for Physics,
Hungarian Academy of Sciences
(29-33, Konkoly Thege Miklys ?ut., Budapest H-1525, Hungary)
4 B.P. Konstantinov Petersburg Nuclear Physics Institute
(Orlova Roscha, Gatchina 188300, Leningrad district, Russia)

Neutron Studies of the Structure of Non-Polar Magnetic Fluids with Surfactant Excess

Section: Soft matter
Original Author's Text: Ukrainian

Abstract: Non-polar magnetic fluid systems with an excess of surfactants have been studied with the use of the small-angle neutron scattering technique. Two types of highly stable ferrofluids, magnetite/oleic acid/decalin and magnetite/myristic acid/decalin, with a low (of about 1 vol.%) magnetite content and various acid fractions (up to 25 vol.%) are examined. The aggregation of magnetic particles and surfactant molecules is shown not to occur in the indicated concentration range of the acid molecule excess. The experimental results testify to a change of the interaction between the molecules of oleic and myristic acids in the free (non-adsorbed) state, when they are dissolved in magnetic fluids, and in their solutions in decalin without magnetic particles.

Key words: magnetic fluids, ferrofluids, small-angle neutron scattering, decalin.