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 3
Experimental values of the densities ρ, speeds of sound c, and refractive indices nD at various temperatures T and specific concentrations C of AC for the system AC + 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
887.66
1303.61
1.40731
298.15
882.16
1279.38
1.40464
882.21
1279.46
1.40465
303.15
876.64
1255.24
1.40198
876.68
1255.31
1.40200
308.15
871.14
1231.10
1.39932
871.18
1231.19
1.39935
C (kg·m−3) = 40
C (kg·m−3) = 60
293.15
887.72
1303.59
1.40731
887.76
1303.62
1.40732
298.15
882.23
1279.52
1.40466
882.29
1279.58
1.40467
303.15
876.74
1255.37
1.40201
876.80
1255.41
1.40202
308.15
871.21
1231.26
1.39936
871.27
1231.37
1.39938
C (kg·m−3) = 80
C (kg·m−3) = 100
293.15
887.80
1303.72
1.40733
887.87
1303.72
1.40733
298.15
882.34
1279.64
1.40468
882.41
1279.64
1.40468
303.15
876.85
1255.49
1.40203
876.91
1255.49
1.40203
308.15
871.32
1231.46
1.39938
871.39
1231.46
1.39938
aC (kg·m−3) is the specific concentration of AC in the 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) = 0.05 m·s−1 (level of confidence = 0.95, k = 2), and Uc(nD) = 0.00001.
