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作 者:蒋福宾[1] 曾华辉[2] 杨正业[2] 李俊杰[2] 宋宝玲[2]
机构地区:[1]北京师范大学化学学院,北京100875 [2]广西大学化学化工学院,南宁
出 处:《应用化学》2008年第10期1166-1170,共5页Chinese Journal of Applied Chemistry
基 金:广西自然科学基金(0575002,0640008)资助项目
摘 要:以芘(Py)为荧光探针,十六烷基氯化吡啶(CPC)为猝灭剂,用芘的饱和水溶液为溶剂配制表面活性剂溶液,根据芘的荧光强度比(I1/I3)随表面活性剂水溶液浓度的变化而变化,测定了二(N-脱氢枞基-N,N-二甲基)-N,N′-(1,3-亚丙基)溴化二铵(DDMPDAB)、二(N-脱氢枞基-N,N-二甲基)-N,N′-(1,3-(2-羟基)亚丙基)氯化二铵(DDMHPDAC)和二(N-脱氢枞基-N,N-二甲基)-N,N′-(1,6-亚己基)溴化二铵(DDMHDAB)松香基季铵盐Gemini表面活性剂的CMC值。结果表明,测定值和使用表面张力法测定的值基本一致,分别为2×10^-5、8×10^-5和6×10^-5mol/L。当猝灭剂CPC的浓度在0.04-0.1 mmol/L范围时,用稳态荧光探针法测定了3种产物的胶束聚集数。结果表明,表面活性剂溶液浓度为5-15倍CMC时,胶束聚集数N随表面活性剂浓度增大而线性增大,用外推法分别得到3种产物的临界胶束聚集数Nm分别为10、19和20。Critical aggregation numbers of micelle(Nm) of quaternary ammonium gemini surfactants containing modified rosin,DDMPDAB,DDMHPDAC,and DDMHDAB,were determined by steady-state fluorescence probe method in which pyrene was used as the fluorescence probe and cetylpyridinium chloride(CPC) as the quencher.According to the change of fluorescence intensity ratio of pyrene I1/I3 with the change of surfactant concentration of aqueous solution,critical micelle concentration(CMC) was investigated by steady-state fluorescence probe and compared with that determined by surface tension method.The results showed that CMC determined by steady-state fluorescence probe was in agreement with that determined by surface tension method.CMC values for DDMPDAB,DDMHPDAC and DDMHDAB were 2×10^-5,8×10^-5 and 6×10^-5 mol/L,respectively.Satisfactory results were obtained when the surfactant solution was prepared with saturated aqueous solution of pyrene and the optimum concentration of CPC was selected at 0.04~0.06 mmol/L.The experimental results showed that N increased linearly with the increase of the surfactant concentration in a range of 5~15 times CMC and Nm can be extrapolated from the N—C curve,which were 10,19,and 20,respectively.
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