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Citation: LIN Cui-Ying, ZHAO Jian-Xi, SONG Li. Determination of the Critical Micelle Concentration of Surfactant in Aqueous NaBr or n-Butanol Solution by DMABN[J]. Acta Physico-Chimica Sinica, ;2008, 24(04): 709-714. doi: 10.3866/PKU.WHXB20080429 shu

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

1.
Department of Applied Chemistry, College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350002, P. R. China

Received Date: 8 October 2007
Available Online: 21 January 2008

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.
- DMABN; TICT probe; Salt-containing solution; Alcohol-containing solution; Critical micelle concentration
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