Journal article
Comparing two tetraalkylammonium ionic liquids. II. Phase transitions
The Journal of chemical physics, v 144(22), pp 224505-224505
14 Jun 2016
PMID: 27306016
Abstract
Phase transitions of the ionic liquids n-butyl-trimethylammonium bis(trifluoromethanesulfonyl) imide, [N-1114][NTf2], and methyl-tributylammonium bis(trifluoromethanesulfonyl) imide, [N-1114][NTf2], were investigated by differential scanning calorimetry (DSC), X-ray diffraction (XRD) measurements, and Raman spectroscopy. XRD and Raman spectra were obtained as a function of temperature at atmospheric pressure, and also under high pressure at room temperature using a diamond anvil cell (DAC). [N-1114][NTf2] experiences glass transition at low temperature, whereas [N-1114][NTf2] crystallizes or not depending on the cooling rate. Both the ionic liquids exhibit glass transition under high pressure. XRD and low-frequency Raman spectra provide a consistent physical picture of structural ordering-disordering accompanying the thermal events of crystallization, glass transition, cold crystallization, pre-melting, and melting. Raman spectra in the high-frequency range of some specific cation and anion normal modes reveal conformational changes of the molecular structures along phase transitions. Published by AIP Publishing.
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Details
- Title
- Comparing two tetraalkylammonium ionic liquids. II. Phase transitions
- Creators
- Thamires A. Lima - Universidade de São PauloVitor H. Paschoal - Universidade de São PauloLuiz F. O. Faria - Universidade de São PauloMauro C. C. Ribeiro - Universidade de São PauloFabio F. Ferreira - Universidade Federal do ABCFanny N. Costa - Universidade Federal do ABCCarlos Giles - State University of Campinas
- Publication Details
- The Journal of chemical physics, v 144(22), pp 224505-224505
- Publisher
- American Institute of Physics
- Number of pages
- 10
- Grant note
- CNPq; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ) FAPESP; Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000378926100030
- Scopus ID
- 2-s2.0-84975131389
- Other Identifier
- 991019298718604721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Physical
- Physics, Atomic, Molecular & Chemical