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首页> 外文会议>Nanoscale thermoelectric materials: Thermal and electrical transport, and applications to solid-state cooling and power generation >Large Electrocaloric Effect from Electrical Field Induced Orientational Order-Disorder Transition in Nematic Liquid Crystals Possessing Large Dielectric Anisotropy
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Large Electrocaloric Effect from Electrical Field Induced Orientational Order-Disorder Transition in Nematic Liquid Crystals Possessing Large Dielectric Anisotropy

机译：具有介电常数各向异性的向列型液晶中电场诱导的取向有序无序跃迁的大电热效应

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摘要

Large electrocaloric (EC) effects in ferroelectric polymers and in ferroelectric ceramics have attracted great attention for new refrigeration development which is more environmental friendly and more efficient and thus could be an alternative to the existing vapor-compression refrigerators which consume large energy and release large amount of green house gas. However in the past, all EC effects investigations have been focused on solid state dielectrics. It is interesting to ask whether a large EC effect can also be realized in dielectric fluids. A dielectric fluid with large EC effect could lead to new design of cooling devices with simpler structures than these based on solid state EC materials, for example, they can be utilized as both the refrigerant and heat exchange fluid. Here we present that a large EC effect can be realized in the liquid crystal (LC) 5CB near it's nematic-isotropic (N-I) phase transition. The LC 5CB possesses a large dielectric anisotropy which can induce large polarization change from the isotropic phase to the nematic phase near the N-I transition. An isothermal entropy change of more than 23 Jkg~(-1)K~(-1) was observed near 39 ℃ that is just above the N-I transition.
机译：铁电聚合物和铁电陶瓷中的大电热（EC）效应已引起人们对新制冷技术发展的高度关注，这种制冷技术更加环保，效率更高，因此可以替代现有的耗能大，释放量大的蒸汽压缩式制冷机。温室气体。但是，过去，所有EC效应研究都集中在固态电介质上。有趣的是，是否还可以在介电液中实现较大的EC效应。具有较大EC效应的介电流体可以导致冷却装置的新设计，其结构要比基于固态EC材料的冷却装置更简单，例如，它们既可以用作制冷剂，也可以用作热交换流体。在这里，我们提出在向列各向同性（N-1）相变附近的液晶（LC）5CB中可以实现较大的EC效应。 LC 5CB具有较大的介电常数各向异性，可以在N-1跃迁附近引起从各向同性相向向列相的大极化变化。在接近N-I转变的39℃附近观察到等温熵变超过23 Jkg〜（-1）K〜（-1）。

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  • 会议地点 San Francisco CA(US)
  • 作者

    Xiao-Shi Qian; S. G. Lu; Xinyu Li; Haiming Gu; L-C Chien; Q. M. Zhang;

  • 作者单位

    Department of Electrical Engineering The Pennsylvania State University, University Park, PA 16802, USA;

    Materials Research Institute The Pennsylvania State University, University Park, PA 16802, USA;

    Department of Electrical Engineering The Pennsylvania State University, University Park, PA 16802, USA;

    Department of Electrical Engineering The Pennsylvania State University, University Park, PA 16802, USA;

    Liquid Crystal Institute and Department of Chemical Physics,Kent State University, Kent, OH 44242, USA;

    Department of Electrical Engineering The Pennsylvania State University, University Park, PA 16802, USA,Materials Research Institute The Pennsylvania State University, University Park, PA 16802, USA;

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