Water droplets self-propel along surfaces that are textured with silicone-oil-covered rails, because a liquid-on-liquid interface removes solid friction and the rail geometry provides a wettability gradient.
Motions of droplets on solid surfaces induced by chemical or thermal gradients
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Self-Propelled Droplet Transport on Shaped-Liquid Surfaces
Water droplets self-propel along surfaces that are textured with silicone-oil-covered rails, because a liquid-on-liquid interface removes solid friction and the rail geometry provides a wettability gradient.