Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (10): 1245-1248.doi: 10.3866/PKU.WHXB20041016

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Aggregation Properties of a New Anionic Gemini Surfactant in Aqueous Solution

Zhu Sen;Cheng Fa;Zheng Bao-Jiang;Yu Jiu-Gao   

  1. Department of Chemistry, School of Science, Tianjin University, Tianjin 300072
  • Received:2004-03-24 Revised:2004-05-11 Published:2004-10-15
  • Contact: Cheng Fa

Abstract: A new anionic Gemini surfactant has been synthesized by the following method: firstly a “dimer" was prepared by the reaction of nonylphenol(NP)and 1,4-dibromobutane in the presence of a catalyst. The “dimer” was sulfonated with chlorosulfonic acid and then neutralized with sodium hydroxide to obtain the title-compound. Micellization of the Gemini surfactant was investigated by using drop volume method. Result showed that the critical micelle concentration (cmc) of the Gemini surfactant has a much lower value compared with those conventional monomeric surfactants. The aggregation number (N) of the micelle was determined with intrinsic fluorescence quenching method as a function of concentration. N goes through a maximum upon increasing the concentration of the Gemini surfactant, meanwhile the formation of liquid crystal is observed.

Key words: Anionic Gemini surfactant, Drop volume method, cmc, Aggregation number