Morphology and Self-induced Motioin of Particles in Plasmas

该项目是DFG项目“等离子体中粒子大小和形态的变化”的后续项目。尽管有冠状病毒大流行和进入实验室受到限制，但仍取得了一些重要成果。我们成功地实现了一种优化的测量装置，可以在等离子体运行过程中以高精度和良好的时间分辨率测量粒子的尺寸和折射率。发现腐蚀速率依赖于环境氧浓度，并检测到颗粒表面的形态变化。此外，我们能够探测到以高达几百赫兹的速度旋转的粒子。在新的资助期内，我们希望解决有关非球形和包覆/核壳粒子的重要问题。这里的重点是粒子的自诱导运动，以及表面特性如何影响/实现这种运动。

This project is the successor of DFG project entitled 'Change of Size and Morphology of Particles in Plasmas'. Despite of the corona pandemic and restricted access to the laboratories a number of important results have been obtained. We succeeded to realize an optimized measurement setup which allows to measure size as well as refractive index of the particles with high precision and good temporal resolution during plasma operation. The etch rates were found to rely on the ambient oxygen concentration and morphological changes of the particle surface were detected. Further, we are able to detect particles which are spinning at a rate of up to several hundred Hertz.In the new funding period we want to address important questions concerning non-spherical and coated/core-shell particles. The focus is here on self-induced motion of particles and how surface properties affect/enable this motion.