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.
Compounds
#
Formula
Name
1
C8H18O
octan-1-ol
2
C48H100N2O3
tetradodecylammonium nitrate
Datasets
The table above is generated from the ThermoML associated json file (link above).
POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied;
the numbers refer to the table of compounds on the left.