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http://dx.doi.org/10.12925/jkocs.2016.33.3.540

Non-Newtonian Flow Mechanism for Thixotropic and Dilatant Flow Units of Sodium bis-(2-ethylhexyl)sulfosuccinate-water Micelles  

Kim, Nam Jeong (Department of Chemistry, Sahmyook University)
Publication Information
Journal of the Korean Applied Science and Technology / v.33, no.3, 2016 , pp. 540-548 More about this Journal
Abstract
The non-Newtonian flow curves of sodium bis-(2-ethylhexyl)sulfosuccinate-water lamellar liquid crystals were obtained in various concentrations and temperatures by using a cone-plate rheometer. By applying non-Newtonian flow equation to the flow curves for AOT-water lamellar liquid crystal samples, the rheological parameters were obtained. Particular attention is given to the hysteresis loop detected when the liquid crystal samples are shear under increasing-decreasing shear stress modes which result in thixotropic and dilatant behavior. Sodium bis-(2-ethylhexyl)sulfosuccinate-water lamellar liquid crystals behave as weak gels when they are subjected to shear flow, but when the applied stress surpasses the yield stress, they exhibit non-linear viscoelasticity. Upon decreasing shear rate, the dispersion still preserves much of its structure and consequently its shear stress remains higher than the values measured in the increasing shear rate mode.
Keywords
sodium bis-(2-ethylhexyl)sulfosuccinate; rheometer; thixotropy; dilatancy; rheological parameters;
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Times Cited By KSCI : 3  (Citation Analysis)
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