| Abstract
| - The interaction enthalpies between didodecyldimethylammonium bromide (DDAB) and sodium dodecylsulfate (SDS) have been measured at 298.15 K using an isothermal titration microcalorimeter. From thevariation of enthalpy with SDS concentration, the enthalpy of interaction between DDAB micelles andSDS, the enthalpy of formation of the DDA+SD-(cryst), the enthalpy of vesicle formation of DDAB−SDS,and the enthalpy of transition from vesicles to SDS-rich micelles have been determined to be −29.53,−125.8, 41.23, and 32.10 kJ/mol, respectively. The phase behavior of the DDAB−SDS aqueous mixturehas also been investigated by turbidity measurements and transmission electron microscopy.
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