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Citation: 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 Steadystate Fluorescence Probe Method[J]. Acta Physico-Chimica Sinica, ;2001, 17(09): 828-831. doi: 10.3866/PKU.WHXB20010914 shu

Determination of Critical Micellar Aggregation Numbers by Steadystate Fluorescence Probe Method

1.
School of Chemical and Material Engineering,Southern Yangtze University,Wuxi　214036;Instrumental and Analysis Research Center,Jiangsu Institute of Petrochem Engineering,Changzhou　213016;College of Engineering,Kongju National University,Korea　314-701

Received Date: 6 February 2001
Available Online: 15 September 2001

Aggregation numbers of micelle (Nm) of SDS and AS were determined by steadystate 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.
- Critical micellar aggregation number;Fluorescence probe;Aggregation number of micelle;Sodium dodecyl sulfate(SDS);Sodium dodecyl sulfonate(AS)
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