Local hydration effects in reversed micellar aggregates
2007; Linguagem: Inglês
10.1007/bfb0116324
AutoresF. Aliotta, P. Migliardo, Dorina Ines Donato, V. Turco-Liveri, Ēlisabeth Bardez, B. Larrey,
Tópico(s)Electrostatics and Colloid Interactions
ResumoFT-IR spectra in the hydroxyl region in reversed micelles where the sodium counterions of the surfactant Aerosol-OT have been replaced by Ca2+ and Zn2+ ions are presented. The IR spectra, taken as a function of the molar ratio R = [H2O]/[surfactant], are analzyed in the framework of a twostate model for the water molecules in which the O-H vibration can be split into two contributions: one originated by the water "tightly-bonded" to the surfactant ions, and the other induced by the "bulk" water of the micellar water pool. We also evaluate the percentage a(R) of the bond water in the micellar growth process. Furthermore, an explanation of the O-H stretching band features is suggested by comparison between our spectra and those simulated through an MD "experiment".
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