荧光探针法测定Gemini表面活性剂C_(12)-2-E_n-C_(12)·2Br的临界预胶团浓度

Study of C_(12)-2-E_1-C_(12)·2Br Preaggregation Behavior in Aqueous Solution by 1-Pyrenebutyric Acid Fluorescence Probe

以芘丁酸(PBA)为荧光探针测定了30℃时季铵盐Gemini表面活性剂C12-2-En-C12.2Br水溶液的临界预胶团浓度(cpc)分别为0.029 5(n=1)、0.037 3(n=2)和0.050 1(n=3)mmol/L.结果表明,与通常方法(例如电导等)相比,荧光探针方法能更灵敏地反映二聚表面活性剂的预聚集行为,是一种有效的测定二聚表面活性剂水溶液临界预胶团浓度的方法.

The premicellization of C12-2-E1-C12·2Br in an aqueous solution has been investigated by the steady state fluorescence method using 1-Pyrenebutyric acid（PBA） as the probe.The critical premicelle concentrations（cpc） at 30 ℃ were 0.029 5（n=1）,0.037 3（n=2）and 0.050 1（n=3）mmol/L,respectively.Compared with the traditional method（i.e.,conductivity method）,the steady state fluorescence method is more sensitive to illustrates the premicellar behavior of gemini surfactants,and it is a suitable method for the determination of critical premicelle concentrations of gemini surfactants.