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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received March 12, 2012
Accepted April 13, 2012

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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이미다졸계 이온성 액체의 물성

Physical and Thermodynamic Properties of Imidazolium Ionic Liquids

오수연 강정원¹ 박병흥 김기섭^†

Sooyeoun Oh Jeong Won Kang¹ Byung Heung Park Ki-Sub Kim^†

한국교통대학교 화공생물공학과, 380-702 충북 충주시 대학로 50 ¹한국교통대학교 컴퓨터공학과, 380-702 충북 충주시 대학로 50

Department of Chemical and Biological Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk 380-702, Korea ¹Department of Computer Engineering, Korea National University of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk 380-702, Korea

kks1114@ut.ac.kr

Korean Chemical Engineering Research, August 2012, 50(4), 708-712(5), NONE Epub 25 July 2012

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Abstract

이온성 액체는 일반적으로 거대 헤테로 고리 양이온과 무기 음이온으로 이루어진 염으로, 상온에서 액체로 존재한다. 따라서 이온성 액체의 물성은 양이온과 음이온의 종류, 알킬기의 수에 영향을 받으므로 그 조합에 의해 이온성 액체 각각의 물성이 달라진다. 또한 비휘발성, 열적 안정성, 넓은 전기 화학적 범위를 가지므로 기존의 유기용매를 대체할 주목할 만한 청정 용매(Green solvent)이다. 본 연구에서는 1-Butyl-3-methylimidazolium bromide ([BMIM][Br]), 1-butyl-3-methylimidazolium Chloride ([BMIM][Cl]), 1-butyl-3-methylimidazolium iodide ([BMIM][I]) 그리고 1-butyl-3-_x000D_ methylimidazolium tetrafluoroborate ([BMIM][BF4])을 합성하였으며, 그 중 [BMIM][Br], [BMIM][I], [BMIM][BF4]의 밀도, 점도, 굴절률, 열용량과 이온전도도를 293.2~323.2 K의 온도범위에서 측정하였다. 밀도와 굴절률은 [BMIM][I]가 세 이온성 액체 중 가장 높았으며, 점성은 [BMIM][Br]가 가장 높았다. 열용량은 [BMIM][Br]보다 [BMIM][BF4]가 높았으며, 이온 전도도는 [BMIM[I]보다 [BMIM][BF4]가 더 높았다.

Ionic liquids (ILs) existing as liquid state at room temperature are composed of a immense heterocyclic cation and inorganic anion which is smaller than cation's size . Thus, the species of cation and anion as well as the length of alkyl group on the cation have influence on their physical properties. Their outstanding properties such as non-volatility, thermal stability and wide range of electrochemical stability make these materials excellent candidates for green solvent which can substitute the conventional organic solvents. In this study, ILs based on imidazolium cation have been synthesized such as 1-butyl-3-methylimidazolium bromide ([BMIM][Br]), 1-butyl-3-methylimidazolium chloride ([BMIM] [Cl]), 1-butyl-3-methylimidazolium iodide ([BMIM][I]), and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF4]). The density, viscosity, refractive index, heat capacity and ionic conductivity of [BMIM][Br], [BMIM][I], and [BMIM] [BF4] were measured over range of temperature of 293.2 to 323.2 K. The density and refractive index values of [BMIM][I] were the highest among three ILs and the viscosity values of [BMIM][Br] were the highest among three ILs. The heat capacities [BMIM][BF4] were higher than those of [BMIM][Br]. The ionic conductivities of [BMIM][BF4] were higher than those of [BMIM][I].

Keywords

Ionic Liquid Imidazolium Salt Physical Property Ionic Liquid Synthesis

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