This chapter discusses recent trends in the development, fabrication, and characterization of superamphiphobic surfaces. An amphiphobic surface repels both polar liquids, such as water, and nonpolar (oily) liquids, and has therefore useful technological application in microfluidics devices, protective coatings, and medical and food industries. Superamphiphobic surfaces are defined in analogy with superhydrophobic ones: on a superamphiphobic surface, both polar and nonpolar drops exhibit large (>150°) static contact angles and small contact angle hysteresis (limited to few degrees). Different approaches can be used to achieve these properties. First, we describe the use of overhanging microstructures. These patterns support a heterogeneous Cassie–Baxter wetting state, even if the intrinsic contact angle of the liquid with the substrate is smaller than 90°, which is the case for many common oils. We then discuss liquid-infused porous films, a new concept for nonadhesive, liquid-repellent surfaces that became popular under the acronym SLIPS (slippery liquid-infused porous surfaces) and are characterized by a microscopic, rough texture imbued with a lubricant film, which significantly reduces the adhesion of drops.
|Title of host publication||Droplet Wetting and Evaporation: from pure to complex fluids|
|Place of Publication||Amsterdam|
|Number of pages||256|
|Publication status||Published - 2015|