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Biomimetic Coating-free Superomniphobicity.

Ratul Das1,2, Zain Ahmad1, Jamilya Nauruzbayeva1

  • 1King Abdullah University of Science and Technology (KAUST), Water Desalination and Reuse Center (WDRC), and Biological and Environmental Science and Engineering (BESE) Division, Thuwal, 23955-6900, Saudi Arabia.

Scientific Reports
|May 15, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed bio-inspired gas-entrapping microtextured surfaces (GEMS) that repel liquids in air and trap air underwater. This innovation offers a durable, environmentally friendly alternative to traditional superomniphobic surfaces.

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Biomimetics

Background:

  • Superomniphobic surfaces repel polar and apolar liquids, finding use in drag reduction, electronics, food packaging, and separation.
  • Current superomniphobic surfaces often rely on expensive, environmentally persistent perfluorocarbons and are vulnerable to physical damage.
  • Doubly reentrant pillars (DRPs) repel liquids in air but fail upon submersion due to lateral liquid imbibition.

Purpose of the Study:

  • To develop novel microtextures that overcome the submersion limitations of existing superomniphobic surfaces.
  • To create surfaces that exhibit both superomniphobicity in air and robust air-trapping capabilities underwater.
  • To explore bio-inspired designs for advanced surface functionalities.

Main Methods:

  • Bio-inspiration from the cuticles of Dicyrtomina ornata, featuring cuboidal secondary granules with mushroom-shaped caps.
  • Fabrication of gas-entrapping microtextured surfaces (GEMS) using two-photon polymerization, incorporating biomimicking pillars around DRP arrays.
  • Investigation of a GEMS variation with a short wall beneath the secondary pillar caps.

Main Results:

  • The developed GEMS robustly entrap air when submerged in wetting liquids.
  • The GEMS surfaces demonstrate superomniphobicity in air, repelling both polar and apolar liquid droplets.
  • This represents the first microtexture enabling intrinsically wetting materials to achieve simultaneous superomniphobicity in air and robust underwater air entrapment.

Conclusions:

  • Bio-inspired GEMS offer a breakthrough in surface engineering, addressing the limitations of previous superomniphobic designs.
  • These surfaces provide a durable, coating-free solution for ultra-repellent applications.
  • The findings pave the way for the rational design of advanced surfaces with enhanced liquid-repellent properties in diverse environments.