物理化学学报 >> 2008, Vol. 24 >> Issue (04): 709-714.doi: 10.3866/PKU.WHXB20080429

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DMABN测定含溴化钠或正丁醇水溶液中表面活性剂的临界胶团浓度

林翠英; 赵剑曦; 宋利   

  1. 福州大学化学化工学院应用化学系, 福州 350002
  • 收稿日期:2007-10-08 修回日期:2007-12-12 发布日期:2008-04-07
  • 通讯作者: 赵剑曦 E-mail:jxzhao.colloid@fzu.edu.cn

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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摘要： 以对二甲氨基苯甲腈(DMABN)为探针, 测定它在含NaBr或n-C4H9OH的表面活性剂十二烷基三甲基溴化铵(C12TABr)、季铵盐Gemini表面活性剂C12-3-C12·2Br和十二烷基硫酸钠(SDS)水溶液中的第二重荧光对应的强度(Ia)和特征波长(λa)对表面活性剂浓度(c)曲线. 由Ia-c曲线的转折点或λa-c曲线对应的一阶导数极小点可以获得临界胶团浓度(cmc), 扩展了DMABN探针测定表面活性剂cmc的适用性.

关键词: DMABN, TICT探针, 含盐溶液, 含醇溶液, 临界胶团浓度

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