Heterostructured Antifogging Coatings: From Zwitter-Wettable to Wet-Style Superhydrophobic Films
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초록
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While transparent substrates are widely used in various optical applications including lenses, displays, and sensors, they often suffer from a variety of environmental challenges such as excessive fogging and surface contamination. In this work, we demonstrate that a heterostructured polymer thin film consisting a hydrophilic reservoir capped with various hydrophobic capping layer allows water molecules to preferentially condense into the underlying hydrophilic reservoir, while the hydrophobic capping layer resists wetting by water droplets. This concept of zwitter-wettability was further extended to wet-style superhydrophobic coatings which simultaneously exhibit antifogging, antireflective, and self-cleaning properties. By pattern transferring low-surface-energy microstructures onto a heterostructured nanoscale thin film, we achieve antifogging coatings that even allow contaminants adsorbed on the surface to be easily removed by rinsing with water.