Boosting the use of thermoacoustimetry in micellization thermodynamics studies by easing an objective determination of the cmc
| Autor: | Pablo F. Garrido, Alfredo Amigo, Pilar Brocos, Goretti Castro |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Aqueous solution
Chemistry General Chemical Engineering Enthalpy Thermodynamics of micellization General Physics and Astronomy Thermodynamics 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surface tension Adsorption Speed of sound Fitting algorithm Physical and Theoretical Chemistry 0210 nano-technology |
| Zdroj: | Fluid Phase Equilibria. 478:1-13 |
| ISSN: | 0378-3812 |
| Popis: | The thermodynamics of micellization of decyl-β-D-glucopyranoside (β-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 β-C10G1 micellization governed by entropy (I), by enthalpy (III), or by both of them (II). Besides, the adsorption of β-C10G1 and β-C12G1 at the solution/air interface is revisited from surface tension measurements at several temperatures and reviews of literature data. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect