2
0
2010
fro
rau
0
journal
Original
Froba, A. P.[Andreas P.]
Rausch, M. H.[Michael H.]
Krzeminski, K.
Assenbaum, D.[Daniel]
Wasserscheid, P.[Peter]
Leipertz, A.[Alfred]
Int. J. Thermophys.
2010
2020-09-29
Thermal Conductivity of Ionic Liquids: Measurement and Prediction
This study reports thermal-conductivity data for a series of [EMIM] (1-ethyl-3-methylimidazolium)-based ionic liquids (ILs) having the anions [NTf2] (bis(trifluoromethylsulfonyl)imide), [OAc] (acetate), [N(CN)2] (dicyanimide), [C(CN)3] (tricyanomethide), [MeOHPO2] (methylphosphonate), [EtSO4] (ethylsulfate), or [OcSO4] (octylsulfate), and in addition for ILs with the [NTf2]-anion having the cations [HMIM] (1-hexyl-3-methylimidazolium), [OMA] (methyltrioctylammonium), or [BBIM] (1,3-dibutylimidazolium). Measurements were performed in the temperature range between (273.15 and 333.15) K by a stationary guarded parallelplate instrument with a total measurement uncertainty of 3 % (k = 2). For all ILs, the temperature dependence of the thermal conductivity can well be represented by a linear equation. While for the [NTf2]-based ILs, a slight increase of the thermal conductivity with increasing molar mass of the cation is found at a given temperature, the [EMIM]- based ILs show a pronounced, approximately linear decrease with increasing molar mass of the different probed anions. Based on the experimental data obtained in this study, a simple relationship between the thermal conductivity,molar mass, and density is proposed for the prediction of the thermal-conductivity data of ILs. For this, also densities were measured for [EMIM][OAc], [EMIM][C(CN)3], and [HMIM][NTf2]. Themean absolute percentage deviation of all thermal-conductivity data for ILs found in the literature from the proposed prediction is about 7 %. This result represents a convenient simplification in the acquisition of thermal conductivity information for the enormous amount of structurally different IL cation/anion combinations available.
density
ionic liquids
parallel plate method
prediction
refractive index
thermal conductivity
10.1007/s10765-010-0889-3
11-12
31
2059-2077
1
InChI=1S/C6H11N2.C2F6NO4S2/c1-3-8-5-4-7(2)6-8;3-1(4,5)14(10,11)9-15(12,13)2(6,7)8/h4-6H,3H2,1-2H3;/q+1;-1
LRESCJAINPKJTO-UHFFFAOYSA-N
1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide
1-ethyl-3-methylimidazolium 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide
1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)amide
1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide [EMIM][NTf2]
1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
C8H11F6N3O4S2
1
Commercial source
1
99
2
NMR (proton)
2
0.0333
3
Karl Fischer titration
2
InChI=1S/C6H11N2.C2H4O2/c1-3-8-5-4-7(2)6-8;1-2(3)4/h4-6H,3H2,1-2H3;1H3,(H,3,4)/q+1;/p-1
XIYUIMLQTKODPS-UHFFFAOYSA-M
1-ethyl-3-methylimidazolium acetate
C8H14N2O2
1
Commercial source
1
98
2
NMR (proton)
2
0.936
3
Karl Fischer titration
3
InChI=1S/C6H11N2.C2N3/c1-3-8-5-4-7(2)6-8;3-1-5-2-4/h4-6H,3H2,1-2H3;/q+1;-1
MKHFCTXNDRMIDR-UHFFFAOYSA-N
1-ethyl-3-methylimidazolium dicyanamide
C8H11N5
1
Commercial source
1
98
2
NMR (proton)
2
0.103
3
Karl Fischer titration
4
InChI=1S/C6H11N2.C4N3/c1-3-8-5-4-7(2)6-8;5-1-4(2-6)3-7/h4-6H,3H2,1-2H3;/q+1;-1
SCAQVLGGENTPGK-UHFFFAOYSA-N
1-ethyl-3-methyl-1H-imidazolium tricyanomethanide
1-ethyl-3-methylimidazolium tricyanomethanide
C10H11N5
1
Commercial source
1
98
2
NMR (proton)
2
0.0555
3
Karl Fischer titration
5
InChI=1S/C6H11N2.CH5O3P/c1-3-8-5-4-7(2)6-8;1-4-5(2)3/h4-6H,3H2,1-2H3;5H,1H3,(H,2,3)/q+1;/p-1
FBPWGCCPLPHQQH-UHFFFAOYSA-M
1-ethyl-3-methylimidazolium methyl phosphonate
1-ethyl-3-methyl-1H-imidazol-3-ium methyl phosphonate
1-ethyl-3-methylimidazolium methylphosphonate
C7H15N2O3P
1
Commercial source
1
98
2
NMR (proton)
2
0.0232
3
Karl Fischer titration
6
InChI=1S/C6H11N2.C2H6O4S/c1-3-8-5-4-7(2)6-8;1-2-6-7(3,4)5/h4-6H,3H2,1-2H3;2H2,1H3,(H,3,4,5)/q+1;/p-1
VRFOKYHDLYBVAL-UHFFFAOYSA-M
1-ethyl-3-methylimidazolium ethyl sulfate
1-ethyl-3-methyl-1H-imidazol-3-ium ethyl sulfate
1-ethyl-3-methylimidazolium ethyl sulfate [EMIM][EtSO4]
C8H16N2O4S
1
Commercial source
1
99
2
NMR (proton)
2
0.218
3
Karl Fischer titration
7
InChI=1S/C8H18O4S.C6H11N2/c1-2-3-4-5-6-7-8-12-13(9,10)11;1-3-8-5-4-7(2)6-8/h2-8H2,1H3,(H,9,10,11);4-6H,3H2,1-2H3/q;+1/p-1
DAFDIILBFQKIIA-UHFFFAOYSA-M
1-ethyl-3-methylimidazolium octyl sulfate
C14H28N2O4S
1
Commercial source
1
99
2
NMR (proton)
2
0.132
3
Karl Fischer titration
8
InChI=1S/C10H19N2.C2F6NO4S2/c1-3-4-5-6-7-12-9-8-11(2)10-12;3-1(4,5)14(10,11)9-15(12,13)2(6,7)8/h8-10H,3-7H2,1-2H3;/q+1;-1
RCNFOZUBFOFJKZ-UHFFFAOYSA-N
1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
1-hexyl-3-methylimidazolium 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide
1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]amide
1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide [HMIM][NTf2]
[c6mim][ntf2]
C12H19F6N3O4S2
1
Commercial source
1
98
2
NMR (proton)
2
0.0086
2
Karl Fischer titration
9
InChI=1S/C25H54N.C2F6NO4S2/c1-5-8-11-14-17-20-23-26(4,24-21-18-15-12-9-6-2)25-22-19-16-13-10-7-3;3-1(4,5)14(10,11)9-15(12,13)2(6,7)8/h5-25H2,1-4H3;/q+1;-1
LAGQNGWYNLUQRI-UHFFFAOYSA-N
methyltrioctylammonium 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide
methyltrioctylammonium bis-(trifluoromethylsulfonyl)imide
C27H54F6N2O4S2
1
Commercial source
1
98
2
NMR (proton)
2
0.0781
3
Karl Fischer titration
10
InChI=1S/C11H21N2.C2F6NO4S2/c1-3-5-7-12-9-10-13(11-12)8-6-4-2;3-1(4,5)14(10,11)9-15(12,13)2(6,7)8/h9-11H,3-8H2,1-2H3;/q+1;-1
KSFMCDMPMZSNIT-UHFFFAOYSA-N
1,3-dibutyl-1H-imidazolium bis((trifluoromethyl)sulfonyl)amide
1,3-dibutylimidazolium bis(trifluoromethylsulfonyl)imide
C13H21F6N3O4S2
1
Commercial source
1
99
2
NMR (proton)
2
0.0119
3
Karl Fischer titration
1
1
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.1208
4
1
0.0041
1
283.15
5
1
0.1206
4
1
0.0041
1
293.15
5
1
0.1202
4
1
0.0041
1
303.15
5
1
0.1215
4
1
0.0042
1
313.15
5
1
0.1195
4
1
0.0041
1
323.15
5
1
0.1184
4
1
0.0041
1
333.15
5
1
0.119
3
1
0.004
1
343.15
5
1
0.1194
4
1
0.0041
1
353.15
5
1
0.1191
4
1
0.0041
2
2
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.2137
4
1
0.0071
1
283.15
5
1
0.2124
4
1
0.0071
1
293.15
5
1
0.211
3
1
0.007
1
303.15
5
1
0.2102
4
1
0.007
1
313.15
5
1
0.2066
4
1
0.0069
1
323.15
5
1
0.2026
4
1
0.0068
1
333.15
5
1
0.2002
4
1
0.0067
1
343.15
5
1
0.1973
4
1
0.0066
1
353.15
5
1
0.1915
4
1
0.0064
3
2
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Refractive index (Na D-line)
Standard Abbe refractometry
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
283.15
5
1
1.503
5
1
0.0011
1
293.15
5
1
1.5002
5
1
0.0011
1
303.15
5
1
1.4981
5
1
0.0011
1
313.15
5
1
1.495
5
1
0.0012
4
2
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Mass density, kg/m3
VIBTUB:UFactor:4
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
1115.31
6
1
1.69
1
278.15
5
1
1112.13
6
1
1.68
1
283.15
5
1
1108.96
6
1
1.66
1
288.15
5
1
1105.8
6
1
1.65
1
293.15
5
1
1102.69
6
1
1.64
1
298.15
5
1
1099.68
6
1
1.62
1
303.15
5
1
1096.64
6
1
1.61
1
308.15
5
1
1093.6
6
1
1.6
1
313.15
5
1
1090.57
6
1
1.59
1
323.15
5
1
1084.52
6
1
1.56
1
328.15
5
1
1081.52
6
1
1.55
1
333.15
5
1
1078.52
6
1
1.53
1
338.15
5
1
1075.54
6
1
1.52
1
343.15
5
1
1072.57
6
1
1.51
1
348.15
5
1
1069.6
6
1
1.5
1
353.15
5
1
1066.65
6
1
1.48
1
358.15
5
1
1063.71
6
1
1.47
1
363.15
5
1
1060.78
6
1
1.46
5
3
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.2053
4
1
0.0069
1
283.15
5
1
0.205
3
1
0.007
1
293.15
5
1
0.2021
4
1
0.0068
1
303.15
5
1
0.2022
4
1
0.0068
1
313.15
5
1
0.1986
4
1
0.0067
1
323.15
5
1
0.1958
4
1
0.0066
1
333.15
5
1
0.1942
4
1
0.0065
1
343.15
5
1
0.1935
4
1
0.0065
1
353.15
5
1
0.1914
4
1
0.0064
6
4
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.1956
4
1
0.0066
1
283.15
5
1
0.1957
4
1
0.0066
1
293.15
5
1
0.193
3
1
0.007
1
303.15
5
1
0.1918
4
1
0.0064
1
313.15
5
1
0.19
2
1
0.01
1
323.15
5
1
0.1873
4
1
0.0063
1
333.15
5
1
0.1868
4
1
0.0063
1
343.15
5
1
0.1847
4
1
0.0062
1
353.15
5
1
0.1815
4
1
0.0061
7
4
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Refractive index (Na D-line)
Standard Abbe refractometry
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
283.15
5
1
1.5154
5
1
0.0011
1
293.15
5
1
1.5139
5
1
0.0011
1
303.15
5
1
1.511
5
1
0.0011
1
313.15
5
1
1.5084
5
1
0.0011
8
4
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Mass density, kg/m3
VIBTUB:UFactor:4
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
1099.28
6
1
1.62
1
278.15
5
1
1095.68
6
1
1.61
1
283.15
5
1
1092.07
6
1
1.59
1
288.15
5
1
1088.49
6
1
1.58
1
293.15
5
1
1084.91
6
1
1.56
1
298.15
5
1
1081.37
6
1
1.55
1
303.15
5
1
1077.84
6
1
1.53
1
308.15
5
1
1074.32
6
1
1.52
1
313.15
5
1
1070.82
6
1
1.5
1
318.15
5
1
1067.34
6
1
1.49
1
323.15
5
1
1063.88
6
1
1.47
1
328.15
5
1
1060.43
6
1
1.46
1
333.15
5
1
1057
6
1
1.44
1
338.15
5
1
1053.58
6
1
1.43
1
343.15
5
1
1050.18
6
1
1.41
1
348.15
5
1
1046.8
6
1
1.4
1
353.15
5
1
1043.42
6
1
1.38
1
358.15
5
1
1040.07
6
1
1.37
1
363.15
5
1
1036.73
6
1
1.36
9
5
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.1941
4
1
0.0065
1
283.15
5
1
0.1948
4
1
0.0065
1
293.15
5
1
0.1914
4
1
0.0064
1
303.15
5
1
0.1959
4
1
0.0066
1
313.15
5
1
0.1915
4
1
0.0064
1
323.15
5
1
0.1906
4
1
0.0064
1
333.15
5
1
0.1908
4
1
0.0064
1
343.15
5
1
0.1917
4
1
0.0064
1
353.15
5
1
0.1902
4
1
0.0064
10
6
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.1876
4
1
0.0063
1
283.15
5
1
0.1882
4
1
0.0063
1
293.15
5
1
0.1856
4
1
0.0062
1
303.15
5
1
0.1872
4
1
0.0062
1
313.15
5
1
0.184
3
1
0.006
1
323.15
5
1
0.1833
4
1
0.0061
1
333.15
5
1
0.1832
4
1
0.0061
1
343.15
5
1
0.1834
4
1
0.0061
1
353.15
5
1
0.183
3
1
0.006
11
7
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.1712
4
1
0.0057
1
283.15
5
1
0.1711
4
1
0.0057
1
293.15
5
1
0.167
3
1
0.006
1
303.15
5
1
0.1679
4
1
0.0056
1
313.15
5
1
0.1648
4
1
0.0055
1
323.15
5
1
0.1629
4
1
0.0055
1
333.15
5
1
0.1631
4
1
0.0055
1
343.15
5
1
0.1626
4
1
0.0055
1
353.15
5
1
0.1621
4
1
0.0055
12
8
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.1238
4
1
0.0043
1
283.15
5
1
0.1224
4
1
0.0042
1
293.15
5
1
0.1219
4
1
0.0042
1
303.15
5
1
0.1237
4
1
0.0043
1
313.15
5
1
0.122
3
1
0.004
1
323.15
5
1
0.1201
4
1
0.0042
1
333.15
5
1
0.1208
4
1
0.0042
1
343.15
5
1
0.1212
4
1
0.0042
1
353.15
5
1
0.1209
4
1
0.0042
13
8
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Mass density, kg/m3
VIBTUB:UFactor:4
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
1387.84
6
1
2.96
1
278.15
5
1
1383.06
6
1
2.94
1
283.15
5
1
1378.45
6
1
2.92
1
288.15
5
1
1373.85
6
1
2.89
1
293.15
5
1
1369.27
6
1
2.87
1
298.15
5
1
1364.69
6
1
2.85
1
303.15
5
1
1360.12
6
1
2.83
1
308.15
5
1
1355.56
6
1
2.81
1
313.15
5
1
1351.01
6
1
2.78
1
323.15
5
1
1341.94
6
1
2.74
1
328.15
5
1
1337.43
6
1
2.72
1
333.15
5
1
1332.93
6
1
2.7
1
338.15
5
1
1328.45
6
1
2.68
1
343.15
5
1
1323.97
6
1
2.66
1
348.15
5
1
1319.52
6
1
2.64
1
353.15
5
1
1315.07
6
1
2.61
1
358.15
5
1
1310.64
6
1
2.59
1
363.15
5
1
1306.22
6
1
2.57
14
8
1
Principal objective of the work
AB
TRC
12/19/2014
1
Refractive index (Na D-line)
Standard Abbe refractometry
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
283.15
5
1
1.4355
5
1
0.0006
1
293.15
5
1
1.4324
5
1
0.0006
1
303.15
5
1
1.4298
5
1
0.0006
1
313.15
5
1
1.4271
5
1
0.0006
15
9
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.1314
4
1
0.0045
1
283.15
5
1
0.1291
4
1
0.0044
1
293.15
5
1
0.1299
4
1
0.0045
1
303.15
5
1
0.1283
4
1
0.0044
1
313.15
5
1
0.1266
4
1
0.0044
1
323.15
5
1
0.1247
4
1
0.0043
1
333.15
5
1
0.1244
4
1
0.0043
1
343.15
5
1
0.1242
4
1
0.0043
1
353.15
5
1
0.1248
4
1
0.0043
16
10
1
Principal objective of the work
ARR
XXX
1/5/2011
1
Thermal conductivity, W/m/K
Parallel plate method
Liquid
Direct value, X
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Pressure, kPa
Liquid
101.325
6
1
Temperature, K
Liquid
1
273.15
5
1
0.1209
4
1
0.0041
1
283.15
5
1
0.1203
4
1
0.0041
1
293.15
5
1
0.1188
4
1
0.0041
1
303.15
5
1
0.1198
4
1
0.0041
1
313.15
5
1
0.1176
4
1
0.004
1
323.15
5
1
0.117
3
1
0.004
1
333.15
5
1
0.1176
4
1
0.004
1
343.15
5
1
0.1171
4
1
0.004
1
353.15
5
1
0.1164
4
1
0.004