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首页> 外文期刊>Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems >On the photothermal characterization of liquid thermoelectrics. New methodology based on coupled pyroelectric-Seebeck effects, together with frequency and thickness scanning procedures
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On the photothermal characterization of liquid thermoelectrics. New methodology based on coupled pyroelectric-Seebeck effects, together with frequency and thickness scanning procedures

机译：液体热电学的光热表征。 基于耦合的热电塞贝克效应的新方法，以及频率和厚度扫描程序

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摘要

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's 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's thicknesses. Simultaneously, PTE-FS scans, performed at the same thicknesses, lead to the value of LTE's 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's thickness. In such a way the possible influence of the slow Soret effect is eliminated. The results, obtained on octanol + 0.1 mol 1(-1) TDAN (tetradodecylammonium nitrate), alpha = 6.77 x 10(-8) m(2)s(-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.
机译：提出了一种与厚度（TWRC）和斩波频率（FS）扫描程序相结合的新的组合的光素光电热电（PPE-PTE）技术，用于液体热电（LTE）的热表征。在后检测配置中，PPE-TWRC技术用于直接测量LTE的热扩散率。基于用于热扩散率的结果，在两种不同厚度下进行的两个PPE-FS扫描用于精确地确定绝对LTE的厚度。同时，以相同的厚度执行的PTE-FS扫描导致LTE的热力的值。该提出技术的主要优点与基于TWRC扫描的先前报道的程序相比，是一种更精确的绝对LTE厚度的确定。以这样的方式消除了缓慢脱光效应的可能影响。在辛醇+ 0.1mol 1（-1）Tdan（四聚亚甲基铵）上获得的结果，α= 6.77×10（-8）m（2）S（-1），E = 602Ws（1/2）m- 2 s（-1），k = 0.15 W m（1）K-1与先前报告的数据吻合良好。

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