Article ID Journal Published Year Pages File Type
592993 Colloids and Surfaces A: Physicochemical and Engineering Aspects 2014 6 Pages PDF
Abstract

- Apparent and partial molar enthalpies at 298 K of the aqueous solutions of cationic gemini surfactants 1,1′-didodecyl-2,2′-trimethylenebispyridinium dichloride (12-Py(2)-3-(2)Py-12 Cl); 1,1′-didodecyl-2,2′-tetramethylenebispyridinium dichloride (12-Py(2)-4-(2)Py-12 Cl); 1,1′-didodecyl-2,2′-octamethylenebispyridinium dichloride (12-Py(2)-8-(2)Py-12 Cl) and 1,1′-didodecyl-2,2′-dodecamethylenebispyridinium dichloride (12-Py(2)-12-(2)Py-12 Cl) have been measured as a function of concentration in order to verify the role played by the counterion in the unusual trend of the apparent and partial molar enthalpies as a function of the spacer length, already found in the case of methansulfonates.
- The data obtained support the hypothesis of a conformation change dependent on the spacer length, but independent on the counterion.
Related Topics
Physical Sciences and Engineering Chemical Engineering Colloid and Surface Chemistry
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