title: Mechanically Tunable Slippery Behavior on Soft Poly(dimethylsiloxane)-Based Anisotropic Wrinkles Infused with Lubricating Fluid.
abstract: We demonstrate a novel technique to fabricate mechanically tunable slippery surfaces using one-dimensional (anisotropic) elastic wrinkles. Such wrinkles show tunable topography (amplitude) on the application of mechanical strain. Following Nepenthes pitcher plants, lubricating fluid infused solid surfaces show excellent slippery behavior for test liquid drops. Therefore, combining the above two, that is, infusing suitable lubricating fluid on elastic wrinkles, would enable us to fabricate mechanically tunable slippery surfaces. Completely stretched (flat) wrinkles have uniform coating of lubricating fluid, whereas completely relaxed (full amplitude) wrinkles have most of the lubricating oil in the wrinkle grooves. Therefore, water drops on completely stretched surface show excellent slippery behavior, whereas on completely relaxed surface they show reduced slippery behavior. Therefore, continuous variation of wrinkle stretching provides reversibly tunable slippery behavior on such a system. Because the wrinkles are one-dimensional, they show anisotropic tunability of slippery behavior depending upon whether test liquid drops slip parallel or perpendicular to the wrinkles.
authors.affiliation: Department of Physics, Indian Institute of Technology Kanpur , Kanpur 208016, India.
authors.forename: Pritam Kumar
authors.initials: PK
authors.lastname: Roy
authors.affiliation: Department of Physics, Indian Institute of Technology Kanpur , Kanpur 208016, India.
authors.forename: Reeta
authors.initials: R
authors.lastname: Pant
authors.affiliation: Hindustan Unilever Research Centre , Bangalore 560066, India.
authors.forename: Arun Kumar
authors.initials: AK
authors.lastname: Nagarajan
authors.affiliation: Department of Physics, Indian Institute of Technology Kanpur , Kanpur 208016, India.
authors.forename: Krishnacharya
authors.initials: K
authors.lastname: Khare