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首页> 外文期刊>Advanced Functional Materials >Large Electrocaloric Effect in a Dielectric Liquid Possessing a Large Dielectric Anisotropy Near the Isotropic-Nematic Transition
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Large Electrocaloric Effect in a Dielectric Liquid Possessing a Large Dielectric Anisotropy Near the Isotropic-Nematic Transition

机译：在各向同性-向列相变附近具有大介电常数各向异性的介电液体中的大电热效应

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摘要

The recent findings of large electrocaloric effects (ECEs) in ferroelectric polymers and in ferroelectric ceramic thin films have attracted great interest for developing new cooling cycles that are environmental friendly and have the potential to reach better efficiency than the existing vapor-compression approach. Compared with these solid state ECE materials, a dielectric fluid with a large ECE can be more interesting because it may lead to new cooling cycles with simpler structures than these based on solid state ECE materials.Here it is shown that a large ECE can be realized in the liquid crystal (LC) 5CB near its nematic-isotropic (N-I) phase transition. 5CB has a large dielectric anisotropy, which facilitates the electric-field-induced large polarization change. As a result, a large ECE, i.e., an isothermal entropy change of more than 23.6 J kg~(-1) K~(-1) is observed just above the N-I transition.
机译：铁电聚合物和铁电陶瓷薄膜中的大电热效应（ECE）的最新发现吸引了人们极大的兴趣来开发环保的新型冷却循环，并有可能比现有的蒸汽压缩方法获得更高的效率。与这些固态ECE材料相比，具有更大ECE的介电液可能会更有趣，因为与基于固态ECE材料的电介质相比，它可能导致结构更简单的新冷却循环。在此表明，可以实现大ECE液晶（LC）5CB中的向列各向同性（NI）相变附近。 5CB具有大的介电各向异性，这有利于电场引起的大极化变化。结果，在N-I转变的正上方，观察到大的ECE，即等温熵变大于23.6J kg·（-1）K·（-1）。

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  • 来源
    《Advanced Functional Materials》 |2013年第22期|2894-2898|共5页
  • 作者

    Xiao-Shi Qian; Sheng-Guo Lu; Xinyu Li; Haiming Gu; Liang-Chy Chien; Qiming Zhang;

  • 作者单位

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

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

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

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

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