Superamphiphobic Surfaces with Controllable Adhesion Fabricated by Femtosecond Laser Bessel Beam on PTFE

Abstract

In this study, we present a facile method to fabricate superamphiphobic surfaces with controllable adhesion on PTFE, for the first time, using femtosecond laser Bessel beam. Compared to previous structures mostly based on 1D microstructure produced by Gaussian beam, our surfaces are characterized by highly uniform 2D periodic hill-groove structures covered with extensive porousmesh nanostructures. Most significantly, our 2D hill-groove structures has a very high-aspect-ratio since the energy distribution of the Bessel beam is more uniform over a longer focusing range along the beam propagation direction. Moreover, due to the spatial intensity distribution of the Bessel beam, the profile of the obtained microstructures is a nearly perfect semi-spherical shape. As a result, the processed surfaces become superamphiphobic, exhibiting a contact angle of 166° for water and 160° for oil, respectively. The water and oil droplets can easily roll off when the lasertreated surface is tilted by only 0.5°and 7°, respectively. Furthermore, the surface adhesion can be controlled from ultra-low to ultra-high by adjusting the period of the hill-groove 2D-patterned structures. We demonstrate that the ultra-low adhesion surfaces show excellent anti-fog and antiicing properties, while the ultra-high adhesion surfaces can be used for water and oil collection. Both surfaces have a good mechanical stability and are stable over a wide range of temperatures. Our This article is protected by copyright. All rights reserved.3 superamphiphobic PTFE surfaces with tunable adhesion can be used for self-cleaning, water transport pipelines, microfluidic systems and harsh environments.) Received: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

Structured Copper Mesh for Efficient Oil-Water Separation Processed by Picosecond Laser Combined With Chemical Treatment or Thermal Oxidation

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Water‐Based Robust Transparent Superamphiphobic Coatings for Resistance to Condensation, Frosting, Icing, and Fouling

“…Inspired by nature, [ 4–7 ] superhydrophobic surfaces with extreme repellency to water have attracted significant interest, owing to their potential applications in anti‐condensation, anti‐frosting, anti‐icing, anti‐fogging, and self‐cleaning activities. [ 8–20 ] Biomimetic superhydrophobic surfaces can be prepared via different approaches, including reactive ion etching, [ 21 ] chemical/physical processing, [ 22–25 ] lithographing, [ 26,27 ] and coating. [ 28–33 ] Among these approaches, the coating approach has been widely applied, owing to its simple preparation process, low equipment requirement, and wide application range.…”

Effect of Silica Size and Content on Superamphiphobic Properties of Silica-Fluoropolymer Core-Shell Coatings

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