Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (04): 709-714.doi: 10.3866/PKU.WHXB20080429

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Determination of the Critical Micelle Concentration of Surfactant in Aqueous NaBr or n-Butanol Solution by DMABN

LIN Cui-Ying; ZHAO Jian-Xi; SONG Li   

  1. Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350002, P. R. China
  • Received:2007-10-08 Revised:2007-12-12 Published:2008-04-07
  • Contact: ZHAO Jian-Xi E-mail:jxzhao.colloid@fzu.edu.cn

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Abstract: With p-N,N-dimethylaminobenzonitrile (DMABN) as probe, the variations of the intensity of its second fluorescence emission (Ia) and the corresponding characteristic wave-length (λa) with the surfactant (dodecyltrimethyl-ammonium bromide C12TABr, quaternary ammonium Gemini surfactant C12-3-C12·2Br and sodium dodecylsulfate SDS) concentration (c) in NaBr-containing or n-C4H9OH-containing aqueous solution were measured by a Hitachi F4500 fluorescence spectrophotometer. The results showed that the break point on the Ia-c curve and the minimum of the derivative variation corresponding to the λa-c curve agreed well with the critical micelle concentration (cmc) of the surfactant. This extends the range of DMABN as probe to measure the cmc of surfactant.

Key words: DMABN, TICT probe, Salt-containing solution, Alcohol-containing solution, Critical micelle concentration