Determination of Critical Micellar Aggregation Numbers of Surfactant by Steady-state Fluorescence Probe Method
The critical micelle concentrations of Cetyltrimethylammonium bromide(CTAB),Sodium laurylsulfonate(C12AS)and the given mixtures at ratiol/1 were measured by surface tension measurement in aqueous solution at room temperature.By drawing lgc-γ to determine the CMC values are 0.00091 mol/L,0.0089 mol/L and 0.00004 mol/L.The results showed that the CMC of mixed surfactants was lower than the pure surfactants,showing a better synergetic behavior.To determine the micelle aggregation number with the method of a steady state fluorescence quenching,Pyrene was used as probe and Benzophenone as quencher.The concentration of pyrene was fixed in 1×10-5 mol/L,and the concentrations of Benzophenone were selected in difference.The results showed that the aggregation number increased linearly with the increasing of CTAB concentration.The micelle aggregation number of C12AS solution which is higher than the series of CMC concentration showed the trend of gradually increase.The micelle aggregation number which increased with the increasing of surfactant concentration of the mixed surfactant system were lower than that of pure C12AS and pure CTAB.
CTAB C12AS CMC Micelle aggregation number surface tension fluorescence probe(Py) quencher(Benzophenone)
SHAO Guoquan YANG Zhanzhao WANG Min ZHAO Qiwen
Department of Chemistry and Matierials Engineering,Hefei University,Hefei 230022,China
国际会议
合肥
英文
420-423
2008-06-05（万方平台首次上网日期，不代表论文的发表时间）