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Mesophase formation and thermal behavior of catanionic mixtures of gemini surfactants with sodium alkylsulfates

Mesophase formation and thermal behavior of catanionic mixtures of gemini surfactants with sodium alkylsulfates,10.1007/s10973-009-0653-8,Journal of T

Mesophase formation and thermal behavior of catanionic mixtures of gemini surfactants with sodium alkylsulfates  
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The thermal behavior for three homologous series of cationic geminis surfactants of the type n-2-n, alkanediyl-α,ω-bis(alkyldimethylammonium bromide), with n = 12, 14, 16, and 18, and sodium alkyl sulfates, SC m S, with m = 12, 14, and 16, is reported here. The cationic/anionic molar ratio is kept at 1:2 (equicharged mixtures), and salt is also present. Polarizing light microscopy and differential scanning calorimetry show a stepwise fusion for the mixtures with appearance of several mesophases between the crystalline structures and the isotropic liquid. A main endothermic transition is observed, associated with partial chain melting and consequent loss of crystalline order, followed by a transition to a smectic liquid crystal. The phase transition thermodynamics is interpreted in terms of an interplay between van der Waals chain–chain interactions and ionic head group interactions.
Journal: Journal of Thermal Analysis and Calorimetry - J THERM ANAL CALORIM , vol. 100, no. 2, pp. 501-508, 2010
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