Effect of gravity & interfacial tension on the dried pattern formation by an evaporation

Understanding the interaction between fluid dynamics, particularly capillary and Marangoni flows, and nanoscale colloidal interactions is crucial for controlling final deposition patterns. By managing the motion of the three-phase contact line (TPCL) during the evaporation of a colloidal droplet through repetitive pinning-depinning transitions, it possible to create various ring or stripe patterns. This study introduces a novel technique for patterning solid substrates with semi-circular stripe patterns by adjusting the stick-slip of the TPCL through gravity-induced droplet shape deformation. Our results indicate that as droplets evaporate on a substrate, their geometry changes, leading to curvature-driven particle transport along the interface and triggering the stick-slip behavior of the TPCL.