Electrodeposited metal-organic framework films as self-assembled hierarchically superstructured supports for stable omniphobic surface coatings

Superhierarchically rough films are rapidly synthesised on metal substrates via electrochemically triggered self-assembly of meso/macroporous-structured metal-organic framework (MOF) crystals. These coatings are applied to immobilise a functional oil with low surface energy to provide stable coating...

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Bibliographic Details
Published in:Scientific reports 2018-10, Vol.8 (1), p.15400-11, Article 15400
Main Authors: Sablowski, Jakob, Linnemann, Julia, Hempel, Simone, Hoffmann, Volker, Unz, Simon, Beckmann, Michael, Giebeler, Lars
Format: Article
Language:English
Subjects:
140/133
639/301/357/551
639/301/923/1030
639/638/161
639/638/298/921
Acetone
Antifouling substances
Coatings
Copper
Crystals
Fabrication
Humanities and Social Sciences
Hydrophobicity
multidisciplinary
Oil
Scanning electron microscopy
Science
Science (multidisciplinary)
Self-assembly
Spraying
Surface properties
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Summary:Superhierarchically rough films are rapidly synthesised on metal substrates via electrochemically triggered self-assembly of meso/macroporous-structured metal-organic framework (MOF) crystals. These coatings are applied to immobilise a functional oil with low surface energy to provide stable coatings repellent to a wide range of hydrophobic as well as hydrophilic fluids. Such omniphobic surfaces are highly interesting for several applications such as anti-fouling, anti-icing, and dropwise condensation, and become easily scalable with the presented bottom-up fabrication approach. As investigated by environmental scanning electron microscopy (ESEM), the presented perfluorinated oil-infused Cu-BTC coating constitutes of a flat liquid-covered surface with protruding edges of octahedral superstructured MOF crystals. Water and non-polar diiodomethane droplets form considerably high contact angles and even low-surface-tension fluids, e.g. acetone, form droplets on the infused coating. The repellent properties towards the test fluids do not change upon extended water spraying in contrast to oil-infused porous copper oxide or native copper surfaces. It is discussed in detail, how the presented electrodeposited MOF films grow and provide a proficient surface morphology to stabilise the functional oil film due to hemiwicking.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-33542-4