Micelle formation in aqueous NaBr solutions of alkyltrimethylammonium bromides

• Autorzy: Zieliński R.
• Języki publikacji: EN

Abstrakty

EN

Sound velocity in aqueous solutions of alkyltrimethylammonium bromides with alkyl chains of octyl, decyl, dodecyl and tetradecyl has been measured as a function of surfactant and NaBr concentration at 25 degree C. The critical micelle concentrations, CMC were determined from intersection of two straight line portions of the surfactant concentration dependence of sound velocity in the solutions. CMC decreases with the increase of ionic strength, following the Corrin-Harkins equation. The standard free energy of micelle formation was estimated from the CMC at different NaBr concentrations. It was presented as a sum of increments of the methylene and the polar head groups at each NaBr concentration. The methylene group contribution varies with NaBr concentration from -1.81 kJ/mol in water to -2.95 kJ/mol at salt concentrations higher than 0.5 m NaBr.

Słowa kluczowe

EN

amphiphiles; critical micelle concentration; micellar aggregates; surfactants; alkyltrimethylammonium bromides; thermodynamics

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1998
• Tom: Vol. 72, nr 1
• Strony: 127--136
• Opis fizyczny: Bibliogr. 41 poz., tab., wykr.

Twórcy

autor

Zieliński R.

• Department of General Technology Faculty of Commodity Science University of Economics Aleja Niepodległości 10 60-967 Poznań Poland