A Thermodynamics Study on the Tetrahydrofuran Effect in Exfoliated Graphite Nanoplatelets and Activated Carbon Mixtures at Temperatures between 293.15 and 308.15 K
Table 4
Experimental values of the densities ρ, speeds of sound c, and refractive indices nD at various temperatures T and specific concentrations C of xGnP for the system xGnP + THF.a
T (K)
ρ (kg·m−3)
c (m·s−1)
nD
ρ (kg·m−3)
c (m·s−1)
nD
C (kg·m−3) = 0
C (kg·m−3) = 20
293.15
887.62
1303.65
1.40731
887.76
1303.60
1.40691
298.15
882.16
1279.38
1.40464
882.33
1279.43
1.40423
303.15
876.64
1255.24
1.40198
876.85
1255.30
1.40156
308.15
871.14
1231.10
1.39932
871.32
1231.21
1.39895
C (kg·m−3) = 40
C (kg·m−3) = 60
293.15
887.88
1303.57
1.40663
888.06
1303.56
1.40671
298.15
882.44
1279.47
1.40394
882.58
1279.49
1.40399
303.15
876.95
1255.35
1.40121
877.11
1255.38
1.40131
308.15
871.44
1231.26
1.3988
871.64
1231.31
1.39881
C (kg·m−3) = 80
C (kg·m−3) = 100
293.15
888.22
1303.57
1.40697
888.31
1303.59
1.40772
298.15
882.78
1279.48
1.40428
882.89
1279.46
1.40498
303.15
877.34
1255.36
1.40161
877.41
1255.32
1.40241
308.15
871.78
1231.29
1.39905
871.89
1231.27
1.39980
aC (kg·m−3) is the specific concentration of xGnP in THF solvent. Standard uncertainties (u) are u(T) = 0.001 K for ρ and c and u(T) = 0.01 K for nD, and the combined expanded uncertainties (Uc) are Uc(ρ) = 0.01 kg·m−3, Uc(c) = 0.1 m·s−1 (level of confidence = 0.95, k = 2), and Uc(nD) = 0.00001.
