Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
592993 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2014 | 6 Pages |
Abstract
- Apparent and partial molar enthalpies at 298Â K of the aqueous solutions of cationic gemini surfactants 1,1â²-didodecyl-2,2â²-trimethylenebispyridinium dichloride (12-Py(2)-3-(2)Py-12 Cl); 1,1â²-didodecyl-2,2â²-tetramethylenebispyridinium dichloride (12-Py(2)-4-(2)Py-12 Cl); 1,1â²-didodecyl-2,2â²-octamethylenebispyridinium dichloride (12-Py(2)-8-(2)Py-12 Cl) and 1,1â²-didodecyl-2,2â²-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
Authors
Emilia Fisicaro, Carlotta Compari, Franco Bacciottini, Nadia Barbero, Guido Viscardi, Pierluigi Quagliotto,