Phase transition in electrorheological plasmas
Phase transition in electrorheological plasmas
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DOI：
10.1002/ctpp.202100079
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发表时间：
2021-06-25
影响因子：
1.6
通讯作者：
Thoma, Markus H.
中科院分区：
文献类型：
--
作者：
Dietz, Christopher;Budak, Johannes;Thoma, Markus H.
在尘埃等离子体中施加一个交流外电场，微粒子会以串或链的形式排列。类似于电流变流体，这样的系统被称为电流变等离子体。逐渐将AC场变为DC场，串形成被减弱，直到在DC情况下其完全消失。这样，从弦状到各向同性微粒多体系统的交叉过渡可以被研究。在微重力条件下对抛物线飞行中的电流变等离子体进行了实验研究。为了分析图像数据，开发了一个有监督的机器学习代码，发现了一个连续的交叉。分子动力学模拟显示了定性相似的结果，但也与实验结果有一些偏差。
Applying an external electric AC field to a dusty plasma, the micro-particles arrange in strings or chains. In analogy to electrorheological fluids, such a system is called electrorheological plasma. Turning gradually the AC field into a DC field, the string formation is diminished until it vanishes completely in the DC case. In this way, a cross-over transition from a string-like to an isotropic micro-particle many-body system can be investigated. Experimental investigations of electrorheological plasmas are performed under microgravity conditions in parabolic flights. For analysing the image data, a supervised machine learning code was developed and a continuous cross over was found. A molecular dynamics simulation showed qualitatively similar results but also some deviations from the experimental results.