Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

ABSTRACT

The thermodynamics of micellization of decyl-beta-d-glucopyranoside (beta-C10G1) in aqueous solution is studied from multiple-temperature (283.15-323.15 K) speed of sound and density measurements. The Williams method being unsuited to estimate the cmc, we propose the Carpena method (widely used in the cmc determination from conductivity data) as an objective and easy-to-use alternative. Its performance is checked by comparison with a well-established but quite complex procedure: the combination of the Runge-Kutta numerical integrations method and the Levenberg-Marquardt least-squares fitting algorithm. As a result of this investigation, three temperature regions are associated to a beta-C10G1 micellization governed by entropy (I), by enthalpy (III), or by both of them (II). Besides, the adsorption of beta-C10G1 and beta-C12G1 at the solution/air interface is revisited from surface tension measurements at several temperatures and reviews of literature data.