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arXiv 2108.02047physics.plasm-phcond-mat.mtrl-sciphysics.app-ph
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等离子体诱导表面冷却

Plasma-induced surface cooling

John A. Tomko, Michael J. Johnson, David R. Boris, Tzvetelina B. Petrova, Scott G. Walton, Patrick E. Hopkins

摘要:

在这里,我们表明,尽管大量的入射通量的高能物质,等离子体可以诱导材料表面的瞬态冷却。使用时间分辨光学测温原位与此等离子体激发,我们揭示了新的基本物理驱动这种“等离子体冷却”,这是由不同的化学和高能物种,包括这第四种状态的物质。我们表明,等离子体中的光子和大质量粒子赋予表面上不同的化学物质能量,导致局部和时间变化的温度,导致样品表面温度的增加和降低,即使能量被赋予材料。这种平衡来自于化学反应、动量转移和能量交换之间的相互作用,这些反应发生在皮秒到毫秒的不同时间尺度上。因此,我们表明,通过用等离子体大力激发材料,我们可以诱导冷却,这可以导致制冷和热缓解的革命性进展,这种新工艺不会受到当前最先进系统中相同限制的抑制。

英文摘要:

Here we show that, despite a massive incident flux of energetic species, plasmas can induce transient cooling of a material surface. Using time-resolved optical thermometry in-situ with this plasma excitation, we reveal the novel underlying physics that drive this `plasma cooling' that is driven by the diverse chemical and energetic species that comprise this fourth state of matter. We show that the photons and massive particles in the plasma impart energy to different chemical species on a surface, leading to local and temporally changing temperatures that lead to both increases and decreases in temperature on the surface of the sample, even though energy is being imparted to the material. This balance comes from the interplay between chemical reactions, momentum transfer, and energy exchange which occur on different time scales over the course of picoseconds to milliseconds. Thus, we show that through energetically exciting a material with a plasma, we can induce cooling, which can lead to revolutionary advances in refrigeration and thermal mitigation with this new process that is not inhibited by the same limitations in the current state-of-the-art systems.

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