Abstract
We investigate the electrorheological (ER) properties of clay (montmorillonite, sepiolite, and laponite®). The selected clays allow to distinguish between planar particles of different sizes (montmorillonite and laponite®), and elongated ones (sepiolite). The effect of coating them with the surfactant CTAB improves dispersibility in the oil medium and favors the ER response, prticularly in the case of laponite®, whereas in the case of montmorillonite, microscopic observations show that the columnar structures are broken in places leading to a reduced yield stress. Both the static yield stress and the storage modulus grow faster with the field in sepiolite suspensions as compared to laponite®. When dealing with mixed systems, it is found that the field-induced montmorillonite structures are reinforced by the addition of either laponite® or sepiolite, whereas when the latter two are combined, it is laponite® that dominates the ER response.
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Funding
This study was funded by Junta de Andalucía (project PE-2012-FQM0694), Ministerio de Economía y Competitividad (Project No. FIS2013-47666-C3-1-R), Spain, and EU Feder.
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Ramos-Tejada, M.d.M., Rodríguez, J.M. & Delgado, Á.V. Electrorheology of clay particle suspensions. Effects of shape and surface treatment. Rheol Acta 57, 405–413 (2018). https://doi.org/10.1007/s00397-018-1086-8
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DOI: https://doi.org/10.1007/s00397-018-1086-8