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Marangoni self-contracted droplets are formed by a mixture of two liquids,one of larger surface tension and larger evaporation rate than the other. Dueto evaporation, the droplets contract to a stable contact angle instead ofspreading on a wetting substrate. This gives them unique properties, includingabsence of pinning force and ability to move under vapor gradients, self- andexternally imposed. We first model the dynamics of attraction in an unconfinedgeometry and then study the effects of confinement on the attraction range anddynamics, going from minimal confinement (vertical boundary), to mediumconfinement (2-D vapor diffusion) and eventually strong confinement (1-D)."Self-induced" motion is observed when single droplets are placed close to avapor boundary toward which they are attracted, the boundary acting as an imagedroplet with respect to itself. When two droplets are confined between twohorizontal plates, they interact at a longer distance with modified dynamics.Finally, confining the droplet in a tunnel, the range of attraction is greatlyenhanced, as the droplet moves all the way up the tunnel when an externalhumidity gradient is imposed. "Self-induced" motion is also observed, as thedroplet can move by itself towards the center of the tunnel. Confinementgreatly increase the range at which droplets interact as well as their lifetimeand thus greatly expands the control and design possibilities for applicationsoffered by self-contracted droplets.

Two-component self-contracted droplets: long-range attraction and confinement effects