These two steel balls sit in a pool of octane, a component of
petroleum, that has been dyed yellow. Though the ball on the left has picked up
streaks of the oily liquid, the ball on the right has repelled the octane
thanks to a self-healing, superslippery coating called X-SLIPS. Researchers
developed this coating, which repels both water and oil, based on the slippery
interiors of Nepenthes pitcher plants
and the wax layer on plant leaves. To make the coating, the team applied a 2.5-
µm-thick layer of fluorinated silane to the sanded surface of the ball. A
spritz of DuPont’s Krytox lubricant, a perfluorinated oil similar to Teflon,
adheres tightly to the silane to create a surface that fends off water and oil.
After damaging the coating with blasts of oxygen plasma or abuse with 40-grit
sandpaper, the researchers could restore it by simply heating it, causing the
remaining silane to redistribute across the surface and re-adhere. The coating
could be useful on ships or in condiment packaging.
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