Spreading of aqueous droplets with common and superspreading surfactants. A molecular dynamics study

摘要: Abstract The surfactant-driven spreading of droplets is an essential process in many applications ranging from coating flow technology to enhanced oil recovery. Despite the significant advancement describing processes surfactant-laden droplets, including exciting phenomena superspreading, features underlying mechanisms require further understanding. Here, we have carried out molecular dynamics simulations a coarse-grained model with force-field obtained statistical associating fluid theory study laden common and superspreading surfactants. We confirmed important elements mechanism, i.e. adsorption surfactant at contact line fast replenishment bulk. Through detailed comparison range different surfactants, our analysis has indicated that ability adsorb interfaces key feature mechanism. To this end, surfactants tend form aggregates strong hydrophobic attraction aggregated cores prevent interfaces, resulting reduced ability. also show various properties, such as diffusion architecture, play secondary role process. Moreover, discuss drop properties height, angle, surface concentration, highlighting differences between anticipate will provide insight for requiring control wetting.