Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (09): 828-831.doi: 10.3866/PKU.WHXB20010914
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Fang Yun;Liu Xue-Feng;Xia Yong-Mei;Yang Yang;Cai Kun;Suh Jung-Mok;Cho Heon-Young
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Abstract: Aggregation numbers of micelle (Nm) of SDS and AS were determined by steadystate fluorescence probe method in which pyrene was used as fluorescence probe and benzophenone as quencher.Satisfactory results were obtained as shown in Fig.1~2 when the solution of surfactant was prepared with a saturated aqueous solution of pyrene and the optimum concentration of benzophenone was selected in 0~1.00 mmol L-1.The experimental results in Fig.3~5 and Table 4 show that when concentration of surfactant is in 5~9 times of cmc,Nm increases linearly with the increase of concentration and fluctuats slightly with the increment of temperature.It is indicated that Nm is an eigenvalue at c=cmc,which has been defined herefrom as the critical micellar aggregation number [Nm].[Nm] can be extrapolated from Nm~cSAA experimental curves,as shown in Table 3 for SDS 57 (25℃) and 49 (40℃) and for AS 55 (40℃) ,respectively.
Key words: Critical micellar aggregation number, Fluorescence probe, Aggregation number of micelle, Sodium dodecyl sulfate(SDS), Sodium dodecyl sulfonate(AS)
Fang Yun;Liu Xue-Feng;Xia Yong-Mei;Yang Yang;Cai Kun;Suh Jung-Mok;Cho Heon-Young. Determination of Critical Micellar Aggregation Numbers by Steadystate Fluorescence Probe Method[J].Acta Phys. -Chim. Sin., 2001, 17(09): 828-831.
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URL: http://www.whxb.pku.edu.cn/EN/10.3866/PKU.WHXB20010914
http://www.whxb.pku.edu.cn/EN/Y2001/V17/I09/828
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