Stopping Droplet Rebound with Polymer Additives: A Molecular Viewpoint

Abstract The origin of rebound suppression an impacting droplet by a small amount polymer additive has been tentatively explained various physical concepts including the dynamic surface tension, additional energy dissipation non-Newtonian elongational viscosity, elastic force stretched polymer, and friction on receding contact line. To better understand role molecular level, we performed multi-body dissipative particle dynamics simulations droplets solvophobic surfaces. is achieved during hopping stage, line retraction stage. Both slow-hopping slow-retraction mechanisms coexist in wide range simulation parameters, but latter prevailing for large droplets, strong attraction strength between surface. increased adsorption, which maybe higher concentration or larger weight, stimulates both mechanisms. Also, evidence shown from relation angle velocity where slope fitted indication friction.