How does a sessile drop capture a rolling solid sphere?

Anti-dusting, self-cleaning, and particle screening all require capturing rigid particles using liquid drops. However, few studies have examined the process and mechanism by which a sessile drop captures particles. Here, we experimentally investigated the ability of the sessile drop to capture the rolling solid sphere effectively after the impact. Using water and glycerol as the working fluids, we noted three resulting interaction stages: impacting, moving, and pulling. We determined the critical capture and escape velocities by analyzing the energy conversion. As We < 31.73, a higher capture success rate can be achieved with a smaller size ratio and increased viscosity. Introducing the deformation coefficient β, proportional to the Weber number, demonstrates that significant deformations can significantly influence the capture process. Additionally, we present an empirical correlation equation for critical velocity related to the size ratio α to evaluate the potential for capture. Our research could potentially lead to new applications in open microfluidics.