Study of The Rebound of A Nano Droplet from a Surface by Molecular Dynamics Simulation

The nano coatings have been widely used for heat and corrosion resistant surfaces. Nano droplet rebounding from the surface is one of the most important parameters in producing imperfect and defective coatings. The separation or rebounding of nanoparticle from surface depends on various physical factors such as nano droplet diameter, velocity and angle of droplet impact to the surface. The aim of this study was to investigate of phenomenon of nano droplet rebounding and prevent to create non-uniform and non-quality coatings. In this research, nanoscale molecular dynamics modeling was used to simulate of nano droplet rebounding behavior. At first, the nanoparticles and collision surface were simulated and then the Verlet algorithm is used to model this phenomenon. The results show that with increasing of nanoparticle diameter, the rebounding velocity increases that this increasing is linearly with gradient of about 45 degrees. The results show that by reducing of the nanoparticle impact angle, the probability of the droplet rebounding from the surface decreases. By the graphic results of this study, effects of nanoparticle diameter and impact angle can be predicted on the separation and rebounding phenomena, and improved the performance of nanoparticle spray processes, and then prevented defective nano coatings.