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Acta Chimica Sinica ›› 2007, Vol. 65 ›› Issue (15): 1443-1448. Previous Articles     Next Articles

Original Articles

1-烷基-3-甲基咪唑系列室温离子液体表面张力的研究

王建英1,2, 赵风云2, 刘玉敏2, 胡永琪*,1,2   

  1. (1北京化工大学化学工程学院 北京 100029)
    (2河北科技大学化学与制药工程学院 石家庄 050018)
  • 投稿日期:2006-10-13 修回日期:2007-02-05 发布日期:2007-08-14
  • 通讯作者: 胡永琪

Study on Surface Tension of a Series of 1-Alkyl-3-methylimidazolium Room Temperature Ionic Liquids

WANG Jian-Ying1,2; ZHAO Feng-Yun2; LIU Yu-Min2; HU Yong-Qi*,1,2   

  1. (1 College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029)
    (2 College of Chemical and Pharmaceutical Engineering, Hebei University of Sci-ence and Technology, Shijiazhuang 050018)
  • Received:2006-10-13 Revised:2007-02-05 Published:2007-08-14
  • Contact: HU Yong-Qi

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A series of room temperature ionic liquids based on 1-CnH2n＋1-3-methylimidazolium ([Cnmim]) with two kinds of fluorinated anions (BF4－ and PF6－) (n＝2～7; 4～7, respectively) were synthesized, and the structures were characterized and confirmed by 1H NMR, IR and MS. Surface tensions were measured using a Wilhelmy plate apparatus over a wide tempera-ture range (293～338 K). The results show that there is a linear decrease of surface tension with increasing temperature. The values of surface tension span an unusually wide range for compounds of similar structure, from 50.4 mJ/m2 ([C2mim]BF4) to 36.1 mJ/m2 ([C7mim]BF4) at 298 K. Surface properties of the series of synthesized ionic liq-uids were also discussed.

Key words: ionic liquid, synthesis, surface tension, surface property