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Citation: JIANG Fu-Bin, ZENG Hua-Hui, YANG Zheng-Ye, LI Jun-Jie, SONG Bao-Ling. Determination of Critical Micellar Aggregation Numbers of Quaternary Ammonium Gemini Surfactants Containing Modified Rosin by Steady-State Fluorescence Probe Method[J]. Chinese Journal of Applied Chemistry, ;2008, 25(10): 1166-1170. shu

Determination of Critical Micellar Aggregation Numbers of Quaternary Ammonium Gemini Surfactants Containing Modified Rosin by Steady-State Fluorescence Probe Method

1.
a College of Chemistry, Beijing Normal University, Beijing 100875;
2.
b College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004

Corresponding author: JIANG Fu-Bin,
Received Date: 17 September 2007
Available Online: 28 December 2007
Fund Project: 广西自然科学基金(0575002,0640008)资助项目 (0575002,0640008)

Critical aggregation numbers of micelle(N_m) 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 N_m can be extrapolated from the N-C curve,which were 10,19,and 20,respectively.
- quaternary ammonium,
- gemini surfactant,
- fluorescence probe,
- critical micelle concentration,
- aggregation number of micelle
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