Contact phenomena during high velocity collisions of nanoparticles with surfaces

点击翻译按钮获取中文摘要

Collisions between gasborne nanoparticles and walls play an important role in many mechanical processes such as dry powder dispersion, particle separation and particle characterization. At technically relevant concentrations, nanoparticles occur in agglomerated state. Adhesion, fragmentation and rebouncing behavior of such agglomerates after wall collisions are not well understood by now. Therefore, primary particle-wall interactions as well as restructuring and fragmentation during agglomerate impaction as functions of agglomerate structure and impact angle and velocity have been studied experimentally and by means of simulations in the first two periods of this project. The relationship between agglomerate properties, intensity of stress and angle and resulting fragmentation patterns was shown. Based on these results, more general dependencies and equations for the description of the dynamics of nanoparticle wall collisions and for the fragmentation probability as well as size distribution of the fragments as functions of impact velocity and interparticle forces are aimed at in the third period.