Conformal ZnO nanocomposite coatings on micro-patterned surfaces for superhydrophobicity

A conformal coating process is presented to transform surfaces with inherent micro-morphology into superhydrophobic surfaces with hierarchical surface structure using wet chemical spray casting. Nanocomposite coatings composed of zinc oxide nanoparticles and organosilane quaternary nitrogen compound...

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Bibliographic Details
Published in:Thin solid films 2010-07, Vol.518 (19), p.5426-5431
Main Authors: Steele, Adam, Bayer, Ilker, Moran, Stephen, Cannon, Andrew, King, William P., Loth, Eric
Format: Article
Language:English
Subjects:
Arrays
Coatings
Condensed matter: structure, mechanical and thermal properties
Contact angle
Cross-disciplinary physics: materials science
rheology
Droplets
Electron, ion, and scanning probe microscopy
Exact sciences and technology
Materials science
Micro-molding
Nanocomposite
Nanocomposites
Nanomaterials
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Other topics in nanoscale materials and structures
Physics
Polydimethylsiloxane
Scanning electron microscopy
Solid-fluid interfaces
Spray deposition
Structure and morphology
thickness
Structure of solids and liquids
crystallography
Superhydrophobicity
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Thin film structure and morphology
Wettability
Wetting
Zinc oxide
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Description
Summary:A conformal coating process is presented to transform surfaces with inherent micro-morphology into superhydrophobic surfaces with hierarchical surface structure using wet chemical spray casting. Nanocomposite coatings composed of zinc oxide nanoparticles and organosilane quaternary nitrogen compound are dispersed in solution for application. The coating is applied to a micro-patterned polydimethylsiloxane substrate with a regular array of cylindrical microposts as well as a surface with random micro-structure for the purpose of demonstrating improved non-wettability and a superhydrophobic state for water droplets. Coating surface morphology is investigated with an environmental scanning electron microscope and surface wettability performance is characterized by static and dynamic contact angle measurements.
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2010.03.084