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—\(\hbox {Fe}_{3}\hbox {O}_{4}\).The investigations were performed as a function of the nanoparticles’ concentration. Small increases of thermal diffusivity (from \(9.06\times 10^{-8}\,\hbox {m}^{2}{\cdot } \hbox {s}^{-1}\) up to \(9.84\times 10^{-8}\,\hbox {m}^{2}{\cdot } \hbox {s}^{-1})\) and thermal effusivity (from \(450\,\hbox {W}{\cdot } \hbox {s}^{1/2}{\cdot } \hbox {m}^{-2}{\cdot } \hbox {K}^{-1}\) up to \(520\,\hbox {W}{\cdot } \hbox {s}^{1/2}{\cdot } \hbox {m}^{-2}{\cdot } \hbox {K}^{-1})\) with increasing concentration of \(\hbox {Fe}_{3}\hbox {O}_{4}\) nanoparticles (from 0 up to 0.623 mg \(\hbox {Fe}_{3}\hbox {O}_{4}/\hbox {ml}\) 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.
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Work supported in part by the Romanian Ministry of Education and Research Youth and Sport, through the National Research Programs, PN-II-ID-PCE-2011-3-0036, PN-II-PT-PCCA-2011-3.2-1419, and PN-II-RU-PD-2012-3-0270.
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Dadarlat, D., Misse, P.R.N., Maignan, A. et al. Alternative Calorimetry Based on the Photothermoelectric (PTE) Effect: Application to Magnetic Nanofluids. Int J Thermophys 36, 2441–2451 (2015). https://doi.org/10.1007/s10765-015-1855-x
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DOI: https://doi.org/10.1007/s10765-015-1855-x