Journal
CURRENT APPLIED PHYSICS
Volume 13, Issue 1, Pages 271-279Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2012.07.023
Keywords
Ionic liquid; Imidazolium; Alkyl chain length; Domain formation
Funding
- National Research Foundation of Korea
- Korean Government [2009-372000]
- National Research Foundation (NRF)
- Korea government (MEST) [2011-0017435]
- Pusan National University
- National Research Foundation of Korea [2011-0017435, 2009-0072007] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Grants-in-Aid for Scientific Research [23350005] Funding Source: KAKEN
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This study examined the acoustic phonon mode of ionic liquids consisting of 1-alkyl-3-methyl-imidazolium family (CnMIM) cations with n values ranging from 2 to 10 and bis(trifluoromethylsulfonyl)amide (TFSA) anion in the temperature range from 300 K to 100 K. [CnMIM](+)[TFSA](-) showed depolarized (VH) components of Brillouin peaks at temperatures below the glass transition temperature when n is larger than 4. On the other hand, in the case of ionic liquids with different anions, such as [C4MIM](+)[BF4](-), [C4MIM](+)[PF6](-) and [C8MIM](+)[BF4](-), the VH component of Brillouin peaks was not observed in the temperature range investigated. The dielectric loss spectra showed that the temperature dependence of alkyl chain domain relaxation of all ionic liquids followed the Arrhenius law and showed an increase in activation energy at the temperature where the VH component of Brillouin peak appeared. These results suggest that the observed depolarized component of Brillouin peak might originate from uniquely induced polarization in the 2nd domain composed of head groups of cations and anions. (C) 2012 Elsevier B.V. All rights reserved.
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