| 引用本文: | 刘国宇,顾大明,刘海燕,顾硕.离子液体双子咪唑表面活性剂的合成[J].哈尔滨工业大学学报,2013,45(7):72.DOI:10.11918/j.issn.0367-6234.2013.07.014 |
| LIU Guoyu,GU Daming,LIU Haiyan,GU Shuo.Synthesis of ionic-liquid imidazolium Gemini surfactants[J].Journal of Harbin Institute of Technology,2013,45(7):72.DOI:10.11918/j.issn.0367-6234.2013.07.014 |
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| 摘要: |
| 为了提高传统表面活性剂在溶液中的表面活性,合成了以亚甲基链为联接基团、具有对称结构的系列双子咪唑离子液体型表面活性剂．对目标产物结构进行核磁共振氢谱表征．测定了25 ℃下双子咪唑离子液体表面活性剂水溶液的表面张力．结果表明:合成的系列双子咪唑表面活性剂均为目标产物;在联接基团长度一定的情况下,疏水基团碳原子数增加,分子在空气/水界面吸附的趋势增大,其临界胶束浓度和吸附量逐渐减小,吸附面积和pc20逐渐增大,而表面张力受疏水链长影响较小,表现出较高的表面活性;此外,在疏水基团链长一定的情况下,联接基团长度较短的双子咪唑表面活性剂具有较高的降低表面张力的效率和能力,更容易在空气/水界面发生吸附． |
| 关键词: 双子咪唑离子液体 表面活性 吸附 联接基团 气液界面 |
| DOI：10.11918/j.issn.0367-6234.2013.07.014 |
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| 基金项目:黑龙江省自然科学基金青年基金资助项目(QC08C33);哈尔滨市优秀学科带头人基金资助项目(2012RFXXG99). |
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| Synthesis of ionic-liquid imidazolium Gemini surfactants |
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LIU Guoyu 1, GU Daming1, LIU Haiyan 1, GU Shuo2
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(1. Dept. of Chemisty, Harbin Institute of Technology, 150001 Harbin, China; 2. Department of Electrical and Computer Engineering, The George Washington University, 20052 Washington, DC, USA.)
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| Abstract: |
| To improve the surface properties in solution, a series of imidazolum Gemini surfactants with methylene spacer chains were synthesized. The structure of the target product is characterized by 1HNMR. The surface tension of imidazolum Gemini surfactants was measured at 25 ℃. The results show that the synthetic imidazolum Gemini surfactants are consistent with the target structure. As the number of carbon atoms of the hydrophobic group increases, the tendency of adsorption on the gas-liquid interface increases with the fixed length of the hydrophilic spacer. The critical micelle concentration and adsorption capacity decrease while the adsorption area and pc20 increase. The effect of the hydrophobic length on the surface tension is weak with the high surface activities. In addition, the shorter the hydrophilic spacer length of imidazolum Gemini surfactants is, the higher the adsorption and surface tension with the fixed length of the hydrophobic group. |
| Key words: imidazolum gemini surfactants surface activities adsorption spacer group Gas-liquid interface
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