Aggregation Behavior of 1-Alkyl-3-methylimidazolium Tetrafluoroborate Ionic Liquids in Aqueous Solutions
文献类型：期刊论文
| 作者 | Fu Su-Zhen; Chen Qing-De; Shen Xing-Hai |
| 刊名 | ACTA PHYSICO-CHIMICA SINICA
 |
| 出版日期 | 2011-08-01 |
| 卷号 | 27期号:8页码:1913-1918 |
| 关键词 | Ionic Liquids 1-alkyl-3-methylimidazolium Tetrafluoroborate Isothermal Titration Calorimetry Fluorescence Conductivity |
| ISSN号 | 1000-6818 |
| DOI | 10.3866/PKU.WHXB20110713 |
| 英文摘要 | The aggregation behavior of 1-alkyl-3-methylimidazolium tetrafluoroborate ([C(n)mim][BF4]) ionic liquids in aqueous solutions was investigated by isothermal titration calorimetry (ITC), fluorescence quenching, and conductivity methods. The critical micelle concentration (cmc), the changes of the enthalpy (Delta H-mic), the Gibbs free energy (Delta G(mic)), and the entropy (Delta S-mic) for the micelle formation and the mean aggregation number of the micelles at different concentrations were obtained. We found that entropy was the principle driving force leading to the micellization of these types of ionic liquids. The increase in alkyl chain length led to a decrease in Delta G(mic), favoring the formation of micelles. Furthermore, by combining with the aqueous solution data for [C(n)mim]X (X=Cl-, Br-), the effect of anions on the aggregation behavior of the ionic liquids was investigated. The increase in the hydrophobicity and the volume of the anions favored the formation of micelles when the ionic liquids contained identical cations. This is believed to result from the decrease in electrostatic repulsion between the head groups in the micelles because of the relatively strong binding between the anions and the cations. With respect to [C(12)mim][BF4], the addition of beta-cyclodextrin (beta-CD) caused an increase in its cmc and a decrease in Delta H-mic and Delta S-mic; while the presence of KBF4 caused a decrease in cmc and Delta H-mic, and an increase in Delta S-mic. |
| 语种 | 英语 |
| WOS记录号 | WOS:000292877400020 |
| 出版者 | PEKING UNIV PRESS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/73457]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Shen Xing-Hai |
| 作者单位 | Peking Univ, Beijing Natl Lab Mol Sci, Radiochem & Radiat Chem Key Lab Fundamental Sci, Coll Chem & Mol Engn, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Fu Su-Zhen,Chen Qing-De,Shen Xing-Hai. Aggregation Behavior of 1-Alkyl-3-methylimidazolium Tetrafluoroborate Ionic Liquids in Aqueous Solutions[J]. ACTA PHYSICO-CHIMICA SINICA,2011,27(8):1913-1918. |
| APA | Fu Su-Zhen,Chen Qing-De,&Shen Xing-Hai.(2011).Aggregation Behavior of 1-Alkyl-3-methylimidazolium Tetrafluoroborate Ionic Liquids in Aqueous Solutions.ACTA PHYSICO-CHIMICA SINICA,27(8),1913-1918. |
| MLA | Fu Su-Zhen,et al."Aggregation Behavior of 1-Alkyl-3-methylimidazolium Tetrafluoroborate Ionic Liquids in Aqueous Solutions".ACTA PHYSICO-CHIMICA SINICA 27.8(2011):1913-1918. |
入库方式： OAI收割
来源：化学研究所
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