High-pressure studies on aggregation number of surfactant micelles using the fluorescence quenching method
High-pressure studies on aggregation number of surfactant micelles using the fluorescence quenching method
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DOI：
10.1021/jp020639k
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发表时间：
2002-08-29
影响因子：
3.3
通讯作者：
Hara, K
中科院分区：
文献类型：
--
作者：
Baden, N;Kajimoto, O;Hara, K
使用稳态荧光猝灭方法测定水溶液中非离子表面活性剂胶束 Triton X 100 (TX100) 的聚集数作为压力的函数。这项工作的方法使用猝灭剂（香豆素 153）对探针（芘）进行荧光猝灭，猝灭剂溶解在胶束内。随着压力的增加，TX100的聚集数达到最小值。也就是说，它从大气压下的 250 降至约 100-150 MPa 时的 80，然后在研究的最高压力 500 MPa 时升至 230。这种行为与临界胶束浓度（cmc）对抗压力的周转现象密切相关。考虑压力对胶束浓度的影响，证明除了分散态和胶束态之间的平衡外，不同尺寸的胶束之间也存在平衡。
The aggregation number of a nonionic surfactant micelle, Triton X 100 (TX100), in aqueous solution was determined as a function of pressure by using the method of steady-state fluorescence quenching. The method of this work uses the fluorescence quenching of a probe (pyrene) by a quencher (coumarin 153), which are solubilized within a micelle. With increasing pressure, the aggregation number of TX100 takes a minimum. Namely, it decreases from 250 at atmospheric pressure down to 80 at around 100-150 MPa and then increases up to 230 at 500 MPa, the highest pressure studied. This behavior is closely related to the turnover phenomenon of critical micelle concentration (cmc) against pressure. By taking the pressure effect on the micellar concentration into account, it is demonstrated that in addition to the equilibrium between dispersed state and micellar state, there are equilibria among different-sized micelles.