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Transparent Superhydrophobic and Self-Cleaning Coating.

Binbin Zhang1,2, Xiaochen Xue1,2, Lixia Zhao1

  • 1Key Laboratory of Advanced Marine Materials, Key Laboratory of Marine Environmental Corrosion and Bio-Fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.

Polymers
|July 13, 2024
PubMed
Summary

Researchers developed a transparent superhydrophobic coating using hydrophobic fumed silica (HF-SiO2) and waterborne polyurethane (WPU). This coating achieves high transparency and excellent water repellency for advanced applications.

Keywords:
self-cleaningsuperhydrophobictransparentwater repellency

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Superhydrophobic materials require surface roughness and low surface energy for artificial preparation.
  • Micro-/nanostructures increase roughness but can reduce transparency due to light scattering.
  • Achieving both superhydrophobicity and high transparency in surfaces is a significant research challenge.

Purpose of the Study:

  • To design and construct a transparent superhydrophobic coating with excellent water repellency and high transparency.
  • To investigate the structural and surface properties of the developed coating.
  • To evaluate the functional characteristics and potential applications of the transparent superhydrophobic surface.

Main Methods:

  • Fabrication of a transparent superhydrophobic coating on glass substrates using hydrophobic fumed silica (HF-SiO2) and waterborne polyurethane (WPU).
  • Application of a simple spray-coating technique.
  • Characterization using Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray Spectroscopy (EDS), Laser Scanning Confocal Microscopy (LSCM), Fourier-Transform Infrared Spectroscopy (FTIR), and X-ray Photoelectron Spectroscopy (XPS).

Main Results:

  • The coating exhibited a water contact angle (WCA) of 158.7 ± 1.5° and a sliding angle (SA) of 6.2 ± 1.8°.
  • Characterization revealed a composite structure with micron-scale protrusions and a nano-scale porous network.
  • The coated glass achieved a light transmittance of 96.1% compared to bare glass, alongside excellent water repellency, low interfacial adhesion, and self-cleaning properties.

Conclusions:

  • A transparent superhydrophobic coating combining superhydrophobicity and high transparency was successfully constructed using HF-SiO2 and WPU via spray-coating.
  • The developed coating possesses a unique hierarchical structure contributing to its functional properties.
  • This transparent superhydrophobic coating shows significant potential for applications in underwater observation windows, architectural glass, automotive glass, and protective eyewear.