Magnetic fluids with excesses of a surfactant according to the data of small-angle neutron scattering |
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| Authors: | V I Petrenko M V Avdeev V L Aksenov L A Bulavin L Rosta |
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| Institution: | (1) Joint Institute for Nuclear Research, ul. Zholio Kyuri 6, Dubna, Moscow oblast, 141980, Russia;(2) National Taras Shevchenko University of Kyiv, Vladimirskaya ul. 64, Kiev, 01033, Ukraine;(3) Russian Research Centre, Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182, Russia;(4) Research Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, Budapest, Hungary |
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| Abstract: | Magnetic fluids (magnetite/oleic acid/benzene) with excesses of a surfactant (oleic acid) are studied using small-angle neutron scattering. Solutions of oleic acid in benzene are also studied to reveal whether an aggregation of acid molecules can occur. It is shown that oleic acid does not form micelles in benzene in the range of concentrations under study (up to volume fractions of 35%). It follows from our results that the excess of a surfactant (less than a volume fraction of 25%) in a magnetic fluid does not lead to a noticeable aggregation of its particles. At the same time, an increase in the attraction between free surfactant molecules in the magnetic fluid (compared to pure solutions of oleic acid in benzene) is observed. If the excess of a surfactant is greater than 25%, then the stability of the magnetic fluid is sharply violated, which leads to the aggregation of magnetic particles. |
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