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Conventional slippery surfaces show isotropic drop mobility in alldirections, but many applications require directional drop motion along aparticular path only. In previous studies, researchers used topographicsubstrates, together with different external stimuli, to demonstrateanisotropic drop motion, which is not very efficient and cost-effective.Herein, we report a novel approach to smartly control drop motion onlubricating fluid coated chemically heterogeneous surfaces composed ofalternating hydrophobic and hydrophilic stripes. Upon depositing an aqueousdrop on such a surface, the underneath lubricating fluid dewets from thehydrophilic regions but remains intact on the hydrophobic ones, providingsticky and slippery areas for the drop. This results in remarkable anisotropicdrop sliding behavior, from uniform motion along parallel to stripes tostick-slip motion along the perpendicular to them. Furthermore, we alsodemonstrate a phase diagram summarizing different dynamic situations exhibitedby drops, sticking, or moving in one or both directions.

Anisotropic Stick-Slip Behavior of Aqueous Drops on Lubricated Chemically Heterogeneous Slippery Surfaces