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Isobaric heat capacities of the ionic liquids [Cnmim][Tf2N] (n= 6, 8) from (323 to 573) K at 10 MPa
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Isobaric heat capacities of the ionic liquids [Cnmim][Tf2N] (n= 6, 8) from (323 to 573) K at 10 MPa

S. Bochmann and G. Hefter
Journal of Chemical & Engineering Data, Vol.55(5), pp.1808-1813
2010
DOI: https://doi.org/10.1021/je900676b
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Abstract

Isobaric volumetric heat capacities (σp) of the ionic liquids 1-hexyl (or octyl)-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, [C6mim][Tf2N] and [C8mim][Tf 2N], have been measured in the temperature range of 323 ≤ T/K ≤ 573 with a Tian-Calvet type differential calorimeter at a pressure of 10 MPa. Isobaric massic (cp) and molar (Cp) heat capacities were calculated from the σp values using densities estimated from literature data. The present Cp values increase approximately linearly with temperature over the investigated range. Where comparison is possible, the present results are in excellent agreement with literature data obtained by adiabatic calorimetry but disagree markedly (by up to 7 %) with those measured by differential scanning calorimetry. Both compounds show evidence of decomposition at T ≳ 535 K, which is in approximate agreement with recent slow scan thermogravimetric measurements but is about 85 K lower than suggested by previous fast scan data.

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Citation topics
2 Chemistry
2.89 Ionic, Molecular & Complex Liquids
2.89.508 Ionic Liquids
Web Of Science research areas
Chemistry, Multidisciplinary
Engineering, Chemical
Thermodynamics
ESI research areas
Chemistry
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