期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 12, 期 31, 页码 8067-8074出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200501593
关键词
aggregation; carbon dioxide; critical micelle concentration; micelles
The effect of compressed CO, on the critical micelle concentration (cmc) and aggregation number of sodium bis-2-ethylhexylsulfosuccinate (AOT) reverse micelles in isooctane solution was studied by UV/Vis and florescence spectroscopy methods in the temperature range of 303.2-318.2 K and at different pressures or mole fractions of CO2 (X-CO2). The capacity of the reverse micelles to solubilize water was also determined by direct observation. The standard Gibbs free energy (AG(degrees)(m)), standard enthalpy (Delta H-degrees(m)), and standard entropy (Delta S-degrees(m)) for the formation of the reverse micelles were calculated by using the cmc data determined. It was discovered that the cmc versus X-CO2 curve and the Delta G(degrees)(m) versus X-CO2 curve for a fixed temperature have a minimum, and the aggregation number and water-solubilization capacity of the reverse micelles reach a maximum at the X-CO2 value corresponding to that minimum. These results indicate that CO2 at a suitable concentration favors the formation of and can stabilize AOT reverse micelles. A detailed thermodynamic study showed that the driving force for the formation of the reverse micelles is entropy.
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