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Wednesday, 18 September 2019
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Raw materials & technologies, Technologies, Functional coatings

Functional coatings: Maintaining self-healing superhydrophobic surfaces

Tuesday, 2 September 2014

Maintaining hierarchical roughness and a low surface energy property are keys to long lasting superhydrophobic surfaces.

The superhydrophobicity of a damaged surface could be automatically restored

Source: Uni Zürich

The superhydrophobicity of a damaged surface could be automatically restored

Source: Uni Zürich

By spraying polystyrene/SiO2core/shell nanoparticles as a coating skeleton and polydimethylsiloxane as hydrophobic interconnection, lasting and self-healing superhydrophobic surfaces were fabricated.

Spray coating is a simple process

The coating exposed new roughening structures during the rubbing process, thus maintaining a suitable hierarchical roughness, favouring a superhydrophobic property of the surface. Also, the superhydrophobicity of a damaged surface from an air plasma treatment could be automatically restored in 12h at room temperature or by heat curing and tetrahydrofuran treatment, which helped with the release of hydrophobic polystyrene. This strategy may find practical applications in all kinds of substrates because spray coating is a simple process, and the obtained surfaces possess lasting superhydrophobicity.

The study is published in: Journal of Materials Chemistry A, Issue 36, 2014.

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