Thermophysical and thermodynamic properties of ionic liquids over an extended pressure range: [bmim][NTf2] and [hmim][NTf2]

R. Gomes De Azevedo; J. M.S.S. Esperança; J. Szydlowski; Z. P. Visak; P. F. Pires; H. J.R. Guedes; L. P.N. Rebelo

doi:10.1016/j.jct.2005.04.018

Thermophysical and thermodynamic properties of ionic liquids over an extended pressure range: [bmim][NTf₂] and [hmim][NTf₂]

R. Gomes De Azevedo
, J. M.S.S. Esperança
, J. Szydlowski
, Z. P. Visak
, P. F. Pires
, H. J.R. Guedes
, L. P.N. Rebelo^*

^*Corresponding author for this work

Universidade Nova de Lisboa
University of Warsaw
Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa

Research output: Contribution to journal › Article › peer-review

294 Citations (Scopus)

Abstract

The current study focuses on 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [bmim][NTf₂], and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [hmim][NTf ₂]. The objective is to study the influence of pressure as well as that of the cation's alkyl chain length on several properties of this type of ionic liquids. Speed of propagation of ultrasound waves and densities in pure ionic liquids (ILs) as a function of temperature and pressure have been determined. Several other thermodynamic properties such as compressibilities, expansivities and heat capacities have been obtained. Speed of sound measurements have been carried out in broad ranges of temperature (283 < T/K < 323) and pressure (0.1 < p/MPa < 150), using a non-intrusive microcell. Density measurements have been performed at broad ranges of temperature (298 < T/K < 333) and pressure (0.1 < p/MPa < 60) using a vibrating tube densimeter. The pressure dependence of heat capacities, which is generally mild, is highly dependent on the curvature of the temperature dependence of density.

Original language	English
Pages (from-to)	888-899
Number of pages	12
Journal	Journal of Chemical Thermodynamics
Volume	37
Issue number	9
DOIs	https://doi.org/10.1016/j.jct.2005.04.018
Publication status	Published - Sept 2005

Funding

This work was financially supported by Fundação para a Ciência e Tecnologia, Portugal, under contract POCTI/EQU/35437/00. R.G.A., J.M.S.S.E., and Z.P.V. are grateful to Fundação para a Ciência e Tecnologia for doctoral fellowships. The authors wish to thank the QUILL group, Belfast, led by Prof. Kenneth Seddon for hosting some of us and helping on the synthesis and purification of both ionic liquids.

Keywords

Density
Heat capacity
Ionic liquids
Pressure
Speed of sound
[bmim][NTf ]
[hmim][NTf]

Access to Document

10.1016/j.jct.2005.04.018

Cite this

@article{d73f61294ab04a7dbe10aa28f56bcae9,

title = "Thermophysical and thermodynamic properties of ionic liquids over an extended pressure range: [bmim][NTf2] and [hmim][NTf2]",

abstract = "The current study focuses on 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [bmim][NTf2], and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [hmim][NTf 2]. The objective is to study the influence of pressure as well as that of the cation's alkyl chain length on several properties of this type of ionic liquids. Speed of propagation of ultrasound waves and densities in pure ionic liquids (ILs) as a function of temperature and pressure have been determined. Several other thermodynamic properties such as compressibilities, expansivities and heat capacities have been obtained. Speed of sound measurements have been carried out in broad ranges of temperature (283 < T/K < 323) and pressure (0.1 < p/MPa < 150), using a non-intrusive microcell. Density measurements have been performed at broad ranges of temperature (298 < T/K < 333) and pressure (0.1 < p/MPa < 60) using a vibrating tube densimeter. The pressure dependence of heat capacities, which is generally mild, is highly dependent on the curvature of the temperature dependence of density.",

keywords = "Density, Heat capacity, Ionic liquids, Pressure, Speed of sound, [bmim][NTf ], [hmim][NTf]",

author = "\{Gomes De Azevedo\}, R. and Esperan{\c c}a, \{J. M.S.S.\} and J. Szydlowski and Visak, \{Z. P.\} and Pires, \{P. F.\} and Guedes, \{H. J.R.\} and Rebelo, \{L. P.N.\}",

year = "2005",

month = sep,

doi = "10.1016/j.jct.2005.04.018",

language = "English",

volume = "37",

pages = "888--899",

journal = "Journal of Chemical Thermodynamics",

issn = "0021-9614",

publisher = "Academic Press",

number = "9",

}

TY - JOUR

T1 - Thermophysical and thermodynamic properties of ionic liquids over an extended pressure range

T2 - [bmim][NTf2] and [hmim][NTf2]

AU - Gomes De Azevedo, R.

AU - Esperança, J. M.S.S.

AU - Szydlowski, J.

AU - Visak, Z. P.

AU - Pires, P. F.

AU - Guedes, H. J.R.

AU - Rebelo, L. P.N.

PY - 2005/9

Y1 - 2005/9

N2 - The current study focuses on 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [bmim][NTf2], and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [hmim][NTf 2]. The objective is to study the influence of pressure as well as that of the cation's alkyl chain length on several properties of this type of ionic liquids. Speed of propagation of ultrasound waves and densities in pure ionic liquids (ILs) as a function of temperature and pressure have been determined. Several other thermodynamic properties such as compressibilities, expansivities and heat capacities have been obtained. Speed of sound measurements have been carried out in broad ranges of temperature (283 < T/K < 323) and pressure (0.1 < p/MPa < 150), using a non-intrusive microcell. Density measurements have been performed at broad ranges of temperature (298 < T/K < 333) and pressure (0.1 < p/MPa < 60) using a vibrating tube densimeter. The pressure dependence of heat capacities, which is generally mild, is highly dependent on the curvature of the temperature dependence of density.

AB - The current study focuses on 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [bmim][NTf2], and 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide, [hmim][NTf 2]. The objective is to study the influence of pressure as well as that of the cation's alkyl chain length on several properties of this type of ionic liquids. Speed of propagation of ultrasound waves and densities in pure ionic liquids (ILs) as a function of temperature and pressure have been determined. Several other thermodynamic properties such as compressibilities, expansivities and heat capacities have been obtained. Speed of sound measurements have been carried out in broad ranges of temperature (283 < T/K < 323) and pressure (0.1 < p/MPa < 150), using a non-intrusive microcell. Density measurements have been performed at broad ranges of temperature (298 < T/K < 333) and pressure (0.1 < p/MPa < 60) using a vibrating tube densimeter. The pressure dependence of heat capacities, which is generally mild, is highly dependent on the curvature of the temperature dependence of density.

KW - Density

KW - Heat capacity

KW - Ionic liquids

KW - Pressure

KW - Speed of sound

KW - [bmim][NTf ]

KW - [hmim][NTf]

UR - https://www.scopus.com/pages/publications/22544452757

UR - https://www.sciencedirect.com/science/article/pii/S0021961405000984?via%3Dihub

U2 - 10.1016/j.jct.2005.04.018

DO - 10.1016/j.jct.2005.04.018

M3 - Article

AN - SCOPUS:22544452757

SN - 0021-9614

VL - 37

SP - 888

EP - 899

JO - Journal of Chemical Thermodynamics

JF - Journal of Chemical Thermodynamics

IS - 9

ER -