Sessile drops in weightlessness: an ideal playground for challenging Young’s equation

Abstract Sessile drop creation in weightlessness is critical for designing scientific instruments space applications and manipulating organic or biological liquids, such as whole human blood DNA drops. It requires perfect control of injection, spreading, wetting; however, the simple act creating a on substrate more complex than it appears. A new macroscopic model derived to better understand this related behavior. We find that, given set substrate, liquid, surrounding gas properties, when ratio surface free energies contact line energy scale, angle can vary at static equilibrium over broad volume range. increase decrease against depending sign up an asymptotic value. Consequently, our aims explore configurations that challenge faithful representativity classical Young’s equation extends present understanding wetting.