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首页> 外文期刊>Chemistry: A European journal >Effect of compressed CO2 on the critical micelle concentration and aggregation number of AOT reverse micelles in isooctane
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Effect of compressed CO2 on the critical micelle concentration and aggregation number of AOT reverse micelles in isooctane

机译：压缩CO2对异辛烷中AOT反胶束的临界胶束浓度和聚集数的影响

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摘要

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.
机译：在303.2-318.2的温度范围内，采用UV / Vis和荧光光谱法研究了压缩CO对异辛烷溶液中的-2--2-乙基己基磺基琥珀酸钠（AOT）反胶束的临界胶束浓度（cmc）和聚集数的影响。 K和不同压力或CO2摩尔分数（X-CO2）。还通过直接观察来确定反胶束增溶水的能力。通过使用以下公式计算形成逆胶束的标准吉布斯自由能（AG（度）（m）），标准焓（ΔH度（m））和标准熵（ΔS度（m））。确定的cmc数据。发现在固定温度下，cmc对X-CO2曲线和Delta G（度）（m）对X-CO2曲线最小，反胶束的聚集数和水溶解能力达到最大。对应于该最小值的X-CO2值。这些结果表明，合适浓度的CO2有利于AOT反胶束的形成并能使其稳定。详细的热力学研究表明，形成反胶束的驱动力是熵。

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