Acta Phys. -Chim. Sin. ›› 2001, Vol. 17 ›› Issue (09): 828-831.doi: 10.3866/PKU.WHXB20010914

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

Fang Yun;Liu Xue-Feng;Xia Yong-Mei;Yang Yang;Cai Kun;Suh Jung-Mok;Cho Heon-Young   

  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:2001-02-06 Revised:2001-03-21 Published:2001-09-15
  • Contact: Fang Yun E-mail:fangyunzhou@hotmail.com

Abstract: 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.

Key words: Critical micellar aggregation number, Fluorescence probe, Aggregation number of micelle, Sodium dodecyl sulfate(SDS), Sodium dodecyl sulfonate(AS)