Add time:07/24/2019 Source:sciencedirect.com
The mixed surfactants of dodecyltrimethylammonium (cas 10182-91-9) bromide (DTAB) and 1-dodecyl-3-methylimidazolium bromide (C12mimBr) in aqueous solutions were studied by measurement of electrical conductivity and isothermal titration microcalorimetry (ITC). The critical micelle concentrations (cmc) and the degree of dissociations of counter ions were determined for this system at various surfactant compositions, and the thermodynamic properties of micellization were evaluated. A one-parameter Margules equation was used to fit the cmc values to calculate the mole fraction, the activity coefficients of two surfactant components and the excess properties in mixed micelles.
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