Effect of Counterions on the Shape, Hydration, and Degree of Order at the Interface of Cationic Micelles: the Triflate Case
- Lima, Filipe S.
- Cuccovia, Iolanda M.
- Horinek, Dominik
- Amaral, Lia Q.
- Riske, Karin A.
- Schreier, Shirley
- Salinas, Roberto K.
- Bastos, Erick L.
- Pires, Paulo A. R.
- Bozelli, Jose Carlos
- Favaro, Denize C.
- Rodrigues, Ana Clara B.
- Dias, Luis Gustavo
- El Seoud, Omar A.
- Chaimovich, Hernan
DOIAbstract
Specific ion effects in surfactant solutions affect the properties of micelles. Dodecyltrimethylammonium chloride (DTAC), bromide (DTAB), and methanesulfonate (DTAMs) micelles are typically spherical, but some organic anions can induce shape or phase transitions in DTA(+) micelles. Above a defined concentration, sodium triflate (NaTf induces a phase separation in dodecyltrimethylammonium triflate (DTATf micelles, a phenomenon rarely observed in cationic micelles. This unexpected behavior of the DTATf/NaTf system suggests that DTATf aggregates have unusual properties. the structural properties of DTATf micelles were analyzed by time-resolved fluorescence quenching, small-angle X-ray scattering, nuclear magnetic resonance, and electron parama...
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