4.8 Article

Effervescence-Inspired Self-Healing Plastrons for Long-Term Immersion Stability

Journal

ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 4, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202107831

Keywords

bubbles; Cassie-Wenzel; reactive-wetting; superhydrophobic; superoleophobic

Funding

  1. European Union's Horizon 2020 research and innovation program LubISS [722497]
  2. ERC [340391]
  3. German Research Foundation (DFG)
  4. Projekt DEAL
  5. European Research Council (ERC) [340391] Funding Source: European Research Council (ERC)

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This study presents the concept of passive on-demand recovery of the plastron through a chemical reaction (effervescence), offering a new approach for intervention-free and immersion-durable superhydrophobic/superamphiphobic surfaces.
The use of superhydrophobic/superamphiphobic surfaces demands the presence of a stable plastron, i.e., a film of air between micro- and nanostructures. Without actively replenishing the plastron with gases, it eventually disappears during immersion. The air diffuses into the immersion liquid, i.e., water. Current methods for sustaining the plastron under immersion remain limited to techniques such as electrocatalysis, electrolysis, boiling, and air-refilling. These methods are difficult to implement at scale, are either energy-consuming, or require continuous monitoring of the plastron (and subsequent intervention). Here, the concept of passive on-demand recovery of the plastron via the use of a chemical reaction (effervescence) is presented. A superhydrophobic nanostructured surface is layered onto a wetting-reactive, gas-forming (effervescent) sublayer. During extended exposure to moisture, the effervescent layer must be protected by a moisture-absorbent, water-soluble polymer. Under prolonged immersion, partial collapse of the Cassie-state induces contact of water with the effervescent layer. This induces the local formation of gases from effervescence, which restores the Cassie-state. These facile and scalable design principles offer a new route toward intervention-free and immersion-durable superhydrophobic/superamphiphobic surfaces.

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