3 years ago

Mimicking the 'Rose Petal' and 'Lotus Leaf' Effects on Alumina by Surface Functionalization and Metal Ion Coordination

Rahul Dev Mukhopadhyay, Balaraman Vedhanarayanan, Ayyappanpillai Ajayaghosh
Functional difference of superhydrophobic surfaces such as lotus leaf and rose petals are due to the subtle architectural features created by Nature. Mimicry of these surfaces with synthetic molecules continues to be fascinating as well as challenging. Herein, we demonstrate how the wetting property of inherently hydrophilic alumina surface can be modified with two distinct superhydrophobic behaviors. Functionalization of alumina with an organic ligand resulted in a rose petal-like surface (water pinning) with a contact angle of 145° and a high contact angle hysteresis (± 69°). Subsequent interaction of the ligand with Zn2+ resulted in a lotus leaf-like surface with water rolling behavior due to high contact angle (165°) and low contact angle hysteresis (± 2°). In both cases, coating of an aromatic bis-aldehyde attached with alkoxy chains was necessary to emulate the nanowaxy cuticular feature of natural superhydrophobic materials.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201709463

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