2
0
2017
dad
tri
0
journal
Original
Dadarlat, D.[Dorin]
Tripon, C.[Carmen]
Tosa, V.[Valer]
Thermochim. Acta
2017
2020-09-29
On the photothermal characterization of liquid thermoelectrics. New methodology based on coupled pyroelectric-Seebeck effects, together with frequency and thickness scanning procedures
A new, combined photopyroelectric-photothermoelectric (PPE-PTE) technique, coupled with both thickness (TWRC) and chopping frequency (FS) scanning procedures, is proposed for thermal characterization of liquid thermoelectrics (LTE). The PPE-TWRC technique, in back detection configuration was used for the direct measurement of the LTE fs thermal diffusivity. Based on the results obtained for thermal diffusivity, two PPE-FS scans, performed at two different thicknesses are used for the precise determination of absolute LTE fs thicknesses. Simultaneously, PTE-FS scans, performed at the same thicknesses, lead to the value of LTE fs thermal effusivity. The main advantage of the proposed technique, compared with previously reported procedures based on the TWRC scan, is a more precise determination of absolute LTE fs thickness. In such a way the possible influence of the slow Soret effect is eliminated. The results, obtained on octanol+ 0.1 mol l-1 TDAN (tetradodecylammonium nitrate), alpha=6.77*10.8 m2s-1, e=602 Ws(1/2)m-2 s-1, k=0.15 W m-1 K-1, are in good agreement with previously reported data.
Photopyroelectric technique
Photothermoelectric technique
Liquid thermoelectrics
Thermal parameters
Seebeck effect
10.1016/j.tca.2017.04.013
653
133-137
1
InChI=1S/C8H18O/c1-2-3-4-5-6-7-8-9/h9H,2-8H2,1H3
KBPLFHHGFOOTCA-UHFFFAOYSA-N
octan-1-ol
1-octanol
capryl alcohol
caprylic alcohol
n-octyl alcohol
octanol
octyl alcohol
C8H18O
1
Commercial source
1
98
2
Stated by supplier
2
InChI=1S/C48H100N.NO3/c1-5-9-13-17-21-25-29-33-37-41-45-49(46-42-38-34-30-26-22-18-14-10-6-2,47-43-39-35-31-27-23-19-15-11-7-3)48-44-40-36-32-28-24-20-16-12-8-4;2-1(3)4/h5-48H2,1-4H3;/q+1;-1
AHQMUYHFUYRUJV-UHFFFAOYSA-N
tetradodecylammonium nitrate
N,N,N-tridodecyl-1-dodecanaminium nitrate
tetralaurylammonium nitrate
C48H100N2O3
1
Commercial source
1
99
2
Stated by supplier
1
1
1
2
1
Principal objective of the work
AB
TRC
8/4/2017
1
Thermal diffusivity, m2/s
photopyroelectric-photothermoelectric technique
Liquid
Direct value, X
1
1
Data file compiler
Propagation of evaluated standard uncertainties
95
Liquid
1
Amount concentration (molarity), mol/dm3
2
Liquid
2
Pressure, kPa
Liquid
3
Temperature, K
Liquid
1
0.1
1
2
100
1
3
298
3
1
6.77e-08
3
1
1.9e-09