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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Estimating density of ionic liquids under very high pressure

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Penna, Tatiana C. [1] ; Paschoal, Vitor H. [1] ; Faria, Luiz F. O. [1] ; Ribeiro, Mauro C. C. [1]
Total Authors: 4
[1] Univ Sao Paulo, Dept Quim Fundamental, Lab Espect Mol, Inst Quim, Av Prof Lineu Prestes 748, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: JOURNAL OF MOLECULAR LIQUIDS; v. 265, p. 510-516, SEP 1 2018.
Web of Science Citations: 4

Equation of state according to the Carnahan-Starling-van der Waals model has been proposed for ionic liquids based on the anions tetrafluoborate, {[}BE4](-), hexafluorophosphate, {[}PF6](-), and bis(trifluoromethanesufonyl) imide, {[}NTf2](-), from available volumetric data within the MPa range of pressure. Then, the equation of state is used to estimate density in the GPa range of pressure. The hard sphere part of the equation considered a binary mixture of cation and anion spheres whose diameters exhibit a satisfactory degree of transferability among different systems with a common ion. It is shown that pressure induced vibrational frequency shift, Delta v, of the characteristic Raman band of the stretching mode of {[}BE4](-), {[}PF6](-), and {[}NTf2](-) collapses into a master curve when Delta v is plotted as a function of reduced density for each group of ionic liquids. Thus, Raman spectroscopy provides a validation test of the high-pressure extrapolation of the equation of state for ionic liquids. (C) 2018 Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 12/13119-3 - Vibrational spectroscopy in condensed phases
Grantee:Mauro Carlos Costa Ribeiro
Support type: Research Projects - Thematic Grants
FAPESP's process: 15/07516-8 - Collective dynamics of ionic liquids
Grantee:Vitor Hugo Paschoal
Support type: Scholarships in Brazil - Doctorate (Direct)
FAPESP's process: 15/05803-0 - Ionic liquid structure under high pressure
Grantee:Luiz Felipe de Oliveira Faria
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/07741-6 - Vibrational Spectroscopy and Thermodynamic Properties of Ionic Liquids under High Pressure
Grantee:Tatiana Casselli Penna
Support type: Scholarships in Brazil - Doctorate