Evaporation-Induced Transition from <i>Nepenthes</i> Pitcher-Inspired Slippery Surfaces to Lotus Leaf-Inspired Superoleophobic
Surfaces
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Abstract
The newly developed <i>Nepenthes</i> pitcher (NP)-inspired
slippery surfaces, formed by immobilizing fluoroliquids on lotus leaf
(LL)-inspired superoleophobic surfaces, are of great general interest,
whereas there are many interesting phenomena and fundamental scientific
issues remaining to be unveiled. Here we present our findings of the
effects of evaporation of the fluoroliquid, an inevitable process
in most cases, -induced transition from NP-inspired to LL-inspired
surfaces on the wettability, transparency, and self-cleaning property
of the surfaces. The transition is controlled by regulating the evaporation
temperature of the model fluoroliquid, Krytox100. The evaporation
of Krytox100 has great a influence on the wettability, transparency,
and self-cleaning property. An intermediate “sticky”
state is observed in the transition process. We believe that our findings
in the transition process are helpful in understanding the similarities
and differences between the NP-inspired and LL-inspired surfaces and
in designing new bioinspired antiwetting surfaces and exploring their
potential applications