Calorimetric Observations of the Transition of Spherical to Rodlike Micelles with Solubilized Organic Additives
Abstract
Incremental calorimetric titration of pentanol into aqueous solutions containing 3.5% cationic (tetradecyltrimethylammonium bromide, TTMAB, in 0.05 M NaBr) or anionic (sodium dodecyl sulfate, SDS, in 0.28M NaCl) surfactant and solubilized additives induced the transformation of spherical to rodlike micelles. The effect of the additive on the transition has been quantified as the change in the concentration of pentanol required to cause the transition divided by the concentration of additive, with a negative value indicating a cooperative effect of promoting the transition and a positive value indicating a retarding effect. Aliphatic hydrocarbon additives retarded the transformation for both surfactants, with the exception of a small cooperative effect for cyclohexane on TTMAB. Alkylbenzenes promoted the transition for TTMAB, as did benzene, toluene, and ethylbenzene for SDS, but the propyl and butyl derivatives showed the opposite effect. © 1993 American Chemical Society.
Recommended Citation
P. M. Lindemuth and G. L. Bertrand, "Calorimetric Observations of the Transition of Spherical to Rodlike Micelles with Solubilized Organic Additives," Journal of Physical Chemistry, American Chemical Society (ACS), Jan 1993.
The definitive version is available at https://doi.org/10.1021/j100131a055
Department(s)
Chemistry
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 1993 American Chemical Society (ACS), All rights reserved.
Publication Date
01 Jan 1993
