Abstract
The phase behavior of ternary and quaternary mixtures of water, ethylene glycol, n-dodecane and nonionic surfactant C14E6 was studied. Similarities and differences of the phase behavior between aqueous and nonaqueous systems were found. Replacing water by ethylene glycol in the quaternary system water + ethylene glycol/n-dodecane/C14E6 leads to a shift in the one-, two- and three-phase regions in the phase diagrams. The polar protic solvent ethylene glycol reduces the hydrophobic effect in the multicomponent systems. The result is a higher mutual solubility of ethylene glycol, a weaker adsorption at the internal interface and, hence, a lower solubilization capacity of the amphiphilics. The reduced amphiphilic strength of C14E6 in ethylene glycol or water + ethylene glycol mixtures corresponds to C14E6 in aqueous systems.
In the ternary and quaternary systems we found one-, two- and three-phase regions. However, in the waterless ethylene glycol/n-dodecane/C14E6 system only one- and two-phase regions appeared, but we have not observed the three-phase region.
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Dörfler, HD. (1998). The influence of ethylene glycol on the phase behavior of aqueous microemulsions in quaternary systems. In: Lagaly, G. (eds) Horizons 2000 – aspects of colloid and interface science at the turn of the millenium. Progress in Colloid & Polymer Science, vol 109. Steinkopff. https://doi.org/10.1007/BFb0118163
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DOI: https://doi.org/10.1007/BFb0118163
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