作者:Fang-Fei Chou、Jeng-Shong Shih
DOI:10.1002/jccs.200200092
日期:2002.8
solutions. Comparison of the CMC of crown ether surfactants and other polyoxyethylene surfactants such as decylhexaethylene glycol was made. Effects of salts and solvents on the micellar formation were also investigated. In general, additions of both alkali metal salts and polar organic solvents into the aqueous surfactant solutions increased in the CMC of these surfactants. The formation of micelles in
采用荧光探针和核磁共振(NMR) 方法研究制备的冠醚表面活性剂如癸基15-crown-5 和癸基18-crown-6 的胶束化。芘被用作荧光探针来评估这些表面活性剂在水溶液中的临界胶束浓度 (CMC),而在非水溶液中应用自旋晶格弛豫时间 (T1) 和 H-1 NMR 的化学位移。在水溶液中,具有较低 CMC 的 Decyl 15-crown-5 比具有较高 CMC 的 decyl 18-crown-6 更容易形成胶束,而在非水溶液中,decyl 18-crown-6 比 decyl 15-crown-5 更容易形成胶束。比较了冠醚表面活性剂与其他聚氧乙烯表面活性剂如癸基六乙二醇的CMC。还研究了盐和溶剂对胶束形成的影响。通常,将碱金属盐和极性有机溶剂添加到表面活性剂水溶液中会增加这些表面活性剂的 CMC。NMR方法成功地观察到了甲醇和乙腈等有机溶剂中胶束的形成,而芘荧光探针法很难研究这些表