Abstract
The structural features of aggregation in magnetic fluids based on solutions of the surfactant polysorbate-80 (tween-80) were investigated. Using small-angle X-ray and neutron scattering and dynamic light scattering the fractional distributions of magnetite and cobalt ferrite nanoparticles in a liquid carrier were obtained, for which a comparative analysis was carried out. In the case of neutron scattering, to analyze the contributions from different components of the solutions, a contrast variation based on mixtures of light and heavy water was additionally applied. As a result, it was shown that the studied systems have a more complex structure than classical magnetic fluids, when magnetic nanoparticles form “core-shell” complexes with surfactant molecules, and represent solutions of large associates (size of about 100 nm). Nevertheless, the dispersions show colloidal stability for a long (at least one year) time.
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Nagornyi, A.V., Avdeev, M.V., Ivankov, O.I. et al. Structural Stability of Dispersions of Magnetic Nanoparticles in Aqueous Solutions of Polysorbate-80. J. Surf. Investig. 15, 781–786 (2021). https://doi.org/10.1134/S1027451021040339
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DOI: https://doi.org/10.1134/S1027451021040339