# Alternative Calorimetry Based on the Photothermoelectric (PTE) Effect Application to Magnetic Nanofluids

Abstract : Photothermoelectric (PTE) calorimetry was applied for the first time for thermal characterization of liquids. Both back and front detection configurations, together with the thermal-wave resonator cavity (TWRC) scanning procedure, have been used in order to measure the thermal diffusivity and thermal effusivity of a particular magnetic nanofluid carrier liquid—transformer oil, surfactant—oleic acid, nanoparticles’ type—$\hbox {Fe}_{3}\hbox {O}_{4}$Fe3O4.The investigations were performed as a function of the nanoparticles’ concentration. Small increases of thermal diffusivity (from $9.06\times 10^{-8}\,\hbox {m}^{2}{\cdot } \hbox {s}^{-1}$9.06×10-8m2·s-1 up to $9.84\times 10^{-8}\,\hbox {m}^{2}{\cdot } \hbox {s}^{-1})$9.84×10-8m2·s-1) and thermal effusivity (from $450\,\hbox {W}{\cdot } \hbox {s}^{1/2}{\cdot } \hbox {m}^{-2}{\cdot } \hbox {K}^{-1}$450W·s1/2·m-2·K-1 up to $520\,\hbox {W}{\cdot } \hbox {s}^{1/2}{\cdot } \hbox {m}^{-2}{\cdot } \hbox {K}^{-1})$520W·s1/2·m-2·K-1) with increasing concentration of $\hbox {Fe}_{3}\hbox {O}_{4}$Fe3O4 nanoparticles (from 0 up to 0.623 mg $\hbox {Fe}_{3}\hbox {O}_{4}/\hbox {ml}$Fe3O4/ml fluid) were observed. The comparison with the photopyroelectric (PPE) method shows that PTE and PPE give similar results but, for the moment, PPE is more accurate. © 2015, Springer Science+Business Media New York.
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Submitted on : Monday, July 15, 2019 - 6:07:17 PM
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### Citation

D. Dadarlat, P.R.N. Misse, A. Maignan, E. Guilmeau, R. Turcu, et al.. Alternative Calorimetry Based on the Photothermoelectric (PTE) Effect Application to Magnetic Nanofluids. International Journal of Thermophysics, 2015, 36 (9), pp.2441-2451. ⟨10.1007/s10765-015-1855-x⟩. ⟨hal-02184190⟩

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