Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (11): 1657-1661.doi: 10.3866/PKU.WHXB20071101

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Promotion of the Surface Activity and Aggregation Ability of Sodium Dodecylsulfate in Aqueous Solution by Ionic Liquid 1-butyl-3-methyl-imidazolium Tetrafluoroborate

LEI Sheng; ZHANG Jing; HUANG Jian-Bin   

  1. Beijing National Laboratory for Molecular Sciences (BNLMS), State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
  • Received:2007-07-17 Revised:2007-08-22 Published:2007-11-01
  • Contact: HUANG Jian-Bin E-mail:JBHuang@pku.edu.cn

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Abstract: The surface property and aggregation behavior of an anionic surfactant, sodium dodecylsulfate (SDS), in a mixed solvent of a water-soluble room temperature ionic liquid 1-butyl-3-methyl-imidazolium tetrafluoroborate ([BMim]BF4) and water were investigated by means of surface tension measurements and nuclear magnetic resonance (NMR) spectroscopy. It was found that the critical micelle concentration (cmc) of SDS could be remarkably reduced and the surface activity of the system was enhanced by the addition of a small amount of [BMim]BF4. Moreover, the surface activity and aggregation ability of SDS aqueous solution could be promoted when the molar fraction of [BMim]BF4 in the mixed solvent (x1) was at the range of 0-0.0458. This promotion function was most efficient at x1=0.0018.

Key words: Ionic liquids, Mixed solvent, SDS, Critical micelle concentration, Surface activity