Abstract
We report the influence of counterions and headgroup hydrophobicity on the enthalpies and heat capacities of micelle formation by 1-alkyl-4-n-dodecylpyridinium surfactants in aqueous solution. For micelle-forming 1-alkyl-4-n-dodecylpyridinium iodide surfactants (alkyl = C1−C3), enthalpies of micelle formation show no trend with respect to 1-alkyl chain length. Changes in molecular architecture of the counterion, however, have a large influence on the thermodynamics of micelle formation. It is shown that next to solvation, London dispersion interactions, counterion (substituent)−water interactions, and the microenvironment of counterions adsorbed to micellar surfaces play an important role in determining the exothermicities of micelle formation. Isobaric heat capacities of micelle formation show that the formation of wormlike micelles for salicylate-containing cationic surfactants is due to a favorable microenvironment for salicylate counterions in the Stern layer of micelles.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
