Investigation of micelles, microemulsions, and phospholipid bilayers with the pyridinium N-phenolbetaine et(30), a polarity probe for aqueous interfaces
Investigation of micelles, microemulsions, and phospholipid bilayers with the pyridinium N-phenolbetaine et(30), a polarity probe for aqueous interfaces
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DOI：
10.1021/j150618a022
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发表时间：
1981-09
期刊：
影响因子：
--
通讯作者：
K. Zachariasse;N. Phuc;B. Kozankiewicz
中科院分区：
文献类型：
--
作者：
K. Zachariasse;N. Phuc;B. Kozankiewicz
酚甜菜碱et（30）是一种众所周知的溶剂极性内部探针，用于表征胶束、微乳液和磷脂双层中其环境的极性。探针分子，总是溶解在水界面，传感器的极性变化所带来的盐的加成和表面活性剂链的长度和浓度，counterweight，和温度的变化。这些极性的变化可以与胶束聚集数的变化相关，这意味着当胶束尺寸增加时，直接探针周围的极性变得较低。与十二烷基硫酸钠胶束的et（30）值与聚集数的变化中的不连续性观察到在0.45摩尔添加NaCl，其中胶束的形状已被报道经历一个球棒过渡。微乳液表现为溶胀胶束。磷脂双层的极性最低，与1-丁醇的极性相当。49篇参考文献。
The phenolbetaine et(30), a well-known internal probe of solvent polarity, is used to characterize the polarity of its environment in micelles, microemulsions, and phospholipid bilayers. The probe molecule, invariably solubilized in the aqueous interface, senses changes in polarity brought about by salt addition and variation of surfactant chain length and concentration, counterion, and temperature. These changes in polarity can be correlated with variations in the micellar aggregation number, signifying that the immediate probe surroundings become less polar when the micelle increases in size. With sodium dodecyl sulfate micelles a discontinuity in the variation of the et(30) value with the aggregation number is observed at 0.45 mole added NaCl, where the shape of the micelles has been reported to undergo a sphere-to-rod transition. The microemulsions behave as swollen micelles. The lowest polarity, comparable to that of 1-butanol, is observed for the phospholipid bilayers. 49 references.