Wormlike micelles (WLM) are elongated self-assembly structures that can reach hundreds of nanometers in length and solutions containing WLM has wide applications in various fields, such as drug delivery, enhanced oil recovery, rheology control, drag reduction agents and many home care, personal care and cosmetic products. Its formation is based on noncovalent interactions such as hydrophobic, electrostatic screening, π-π stacking, hydrogen bonding among others. The elongated structures are dynamic and they are continuously breaking and recombining. The formation of wormlike micelles in aqueous solution with cationic surfactant is highly favored in the presence of hydrotropes such as derivatives of benzoate. In this study, we used tetradecyltrimethylammonium bromide (TTAB) and 4-halogen benzoates, such as 4-fluorobenzoate, 4-chlorobenzoate, 4-bromobenzoate and 4-iodobenzoate, to form the wormlike micelles in aqueous solution and understand the implications that the change of the halogen atom brings for the formation of wormlike micelles. Besides that, the calorimetry profile of this type of aggregate is not fully understood and by comparing the results obtained by isothermal titration calorimetry with rheometry, dynamic light scattering, H chemical shift and diffusion coefficient in nuclear magnetic resonance and cryogenic transmission electron microscopy, it is possible to propose a possible interpretation for the calorimetric profile.

Formation of wormlike micelles with tetradecyltrimethylammonium bromide and 4-halogenbenzoates

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.