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Oscillatory Thermopower Waves Based on Bi_2Te_3 Films

机译：基于Bi_2Te_3薄膜的振荡热功率波

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摘要

Exothermic chemical reactions that are coupled to Bi_2Te_3 porous layers, which are deposited onto terracotta or alumina (Al_2O_3) substrates, are used to produce self-propagating thermal waves that are guided along the surface. Nitrocellulose is used as the highly reactive chemical. Bi_2Te_3 is employed because of its large Seebeck coefficient and high electrical conductivity. For the AI_2O_3 based structures, the thermal conduction of the substrate results in strong oscillations of the output signals. Such thermopower waves produce a power as large as 10 mW and voltages as high as 150 mV. The power per mass ratio of the developed system is quite remarkable, namely, on the order of 1 kW kg~-1. Depending on the thermal conductivity of the substrate used, the wave front average propagation velocity is either slow (ca. 0.009 m s~-1 for terracotta) or much faster (on the order of 0.4 m s~-1 for AI_2O_3). We have used a mathematical model based on two coupled heat transport equations, in conjunction with the chemical reaction equation, to predict the behavior of the system, which describes the average propagation velocity and the time between oscillation peaks.
机译：耦合到Bi_2Te_3多孔层的放热化学反应被沉积在兵马俑或氧化铝（Al_2O_3）基底上，用于产生沿表面引导的自蔓延热波。硝酸纤维素用作高反应性化学品。使用Bi_2Te_3是因为它的塞贝克系数大且导电率高。对于基于AI_2O_3的结构，基板的热传导导致输出信号的强烈振荡。这种热电波产生的功率高达10 mW，电压高达150 mV。所开发系统的每单位质量的功率非常显着，即大约1 kW kg〜-1。取决于所用衬底的导热率，波前平均传播速度要么很慢（兵马俑大约为0.009 m s〜-1），要么快得多（对于AI_2O_3大约为0.4 m s〜-1）。我们已经使用了基于两个耦合的热传递方程以及化学反应方程的数学模型来预测系统的行为，该行为描述了平均传播速度和振荡峰之间的时间。

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  • 来源
    《Advanced Functional Materials》 |2011年第11期|p.2072-2079|共8页
  • 作者

    Sumeet Walia; Rodney Weber; Kay Latham; Phred Petersen; Joel T. Abrahamson; Michael S. Strano; Kourosh Kalantar-zadeh;

  • 作者单位

    School of Electrical and Computer Engineering RMIT University Melbourne, VIC 3000, Australia;

    School of Physical, Environmental and Mathematical Sciences University of New South Wales at Australian Defence Force Academy Canberra, ACT 2600, Australia;

    School of Applied Sciences Applied Chemistry RMIT University Melbourne, VIC 3000, Australia;

    School of Media and Communications RMIT University Melbourne, VIC 3000, Australia;

    Department of Chemical Engineering Massachusetts Institute ofTechnology Cambridge, MA 02139, USA;

    Department of Chemical Engineering Massachusetts Institute ofTechnology Cambridge, MA 02139, USA;

    School of Electrical and Computer Engineering RMIT University Melbourne, VIC 3000, Australia;

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