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相关概念视频

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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在接口增强的铁电聚合物中的巨大电热效应

Shanyu Zheng1, Feihong Du1, Lirong Zheng2

  • 1State Key Laboratory of Mechanical System and Vibration, Interdisciplinary Research Center, Institute of Refrigeration and Cryogenics, and MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Science (New York, N.Y.)
|November 30, 2023
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概括
此摘要是机器生成的。

研究人员使用有机晶体二甲基二醇开发了一种新的接口极化策略,以增强聚合物中的电热效应. 这种方法在低电场下实现了巨大的结构和高变化.

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科学领域:

  • 材料科学
  • 凝聚物质物理学
  • 聚合物科学

背景情况:

  • 电热效应需要最大限度地增加极域自由度,并最大限度地减少极化过渡能量障碍.
  • 这些因素的优化已经达到固有的局限性.
  • 现有的策略难以克服域大小,结晶性和极性相关性之间的权衡.

研究的目的:

  • 克服散装铁电的局限性, 提高电热效果.
  • 在异质接口组装极形的新策略.
  • 调查接口工程对巨型结构和高变化的潜力.

主要方法:

  • 使用有机晶体二甲基二醇 (DMHD) 作为3D牺牲模板.
  • 通过DMHD蒸发来组装极形状,采用类似于表皮质的过程.
  • 基于聚乙烯化物制造的聚合物,具有超细分布的多形态共存的极界面.

主要成果:

  • 实现了极细分布的极界面与巨大的形态.
  • 在低电场下证明了100J/kg·K的高变化.
  • 接口偏振策略显著提高了电热性能.

结论:

  • 使用牺牲性有机晶体的接口极化策略有效地提高了电热性能.
  • 这种方法为增强介电材料提供了可通用的方法.
  • 开发的聚合物对介电电容器和超级电容器的应用具有前景.