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We demonstrate a novel technique to fabricate mechanically tunable slipperysurfaces using one dimensional (anisotropic) elastic wrinkles. Such wrinklesshow tunable topography (amplitude) on the application of mechanical strain.Following Nepenthes pitcher plants, lubricating fluid infused solid surfacesshow excellent slippery behavior for test liquid drops. Therefore combining theabove two i.e. infusing suitable lubricating fluid on elastic wrinkles wouldenable us to fabricate mechanically tunable slippery surfaces. Completelystretched (flat) wrinkles have uniform coating of lubricating fluid whereascompletely relaxed (full amplitude) wrinkles have most of the lubricating oilin the wrinkle grooves. Therefore water drops on completely stretched surfaceshow excellent slippery behavior whereas on completely relaxed surface theyshow very poor slippery behavior. Therefore continuous variation of wrinklestretching provide reversibly tunable slippery behavior on such system. Sincethe winkles are one dimensional, they show anisotropic tunability of slipperybehavior depending upon whether test liquid drops slip parallel orperpendicular to the wrinkles.

Mechanically Tunable Slippery Behavior on Soft Poly(dimethylsiloxane) (PDMS) Based Anisotropic Wrinkles Infused with Lubricating Fluid