title: Fluorine-free, liquid-repellent surfaces made from ionic liquid-infused nanostructured silicon.
abstract: Liquid-repellent surfaces based on slippery liquid-infused porous substrates (SLIPS) were prepared from porous, nanostructured silicon surfaces with different surface functionalization, infused with the polar ionic liquid 1-ethyl-3-methylimidazolium methylsulfate ([C2mim]MeSO4). Contrary to nonpolar SLIPS based on perfluorinated substrates and infusion liquids, [C2mim]MeSO4forms stable SLIPS with high energy surfaces like native silicon (Si-SiO2) or ionic liquid-functionalized silicon (Si-[C3mim]Cl), whose liquid-repellent properties against low surface tension liquids (toluene, cyclohexane) were demonstrated by very low sliding angles (α< 3°) and low contact angle hysteresis (Δθ< 10°). These polar, ionic liquid-based SLIPS present a promising, environmentally benign extension of liquid-infused substrates to natural, high-energy oxide surfaces.
authors.affiliation: Institute of Applied Synthetic Chemistry, Vienna University of Technology, Vienna, Austria.
authors.forename: Roland W
authors.initials: RW
authors.lastname: Bittner
authors.affiliation: Institute of Applied Synthetic Chemistry, Vienna University of Technology, Vienna, Austria.
authors.forename: Katharina
authors.initials: K
authors.lastname: Bica
authors.affiliation: Institute of Applied Synthetic Chemistry, Vienna University of Technology, Vienna, Austria.
authors.forename: Helmuth
authors.identifier: 0000-0001-6949-1731
authors.initials: H
authors.lastname: Hoffmann
keywords: Ionic liquids; Monolayers; Nanochemistry; Surface; Wetting