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Issue 11, 2016
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Ultraporous superhydrophobic gas-permeable nano-layers by scalable solvent-free one-step self-assembly

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Abstract

Superhydrophobic materials with excellent humidity tolerance, high porosity and light transmittance are being investigated for numerous applications including moisture-sensitive catalysts and perovskite solar cells. Here, we report the one-step solvent-free synthesis of ultraporous superhydrophobic nano-layers by the on-the-fly functionalization of nanoparticle aerosols. Short exposure of surfaces to hot Mn3O4, ZnO and TiO2 aerosols results in ultraporous nanoparticle networks with repulsive dewetting state approaching ideal Cassie-Baxter superhydrophobicity. In addition to showcasing sliding angles of ca. 0° and very low contact angle hysteresis of 3° ± 2°, these optimal nano-layers have up to 98% porosity and pore size of several micrometres, a key feature to enable efficient penetration of gases to the substrate surface. The stability of this ultraporous superhydrophobic morphology is demonstrated by rapidly applying Moses effect-functionality to substrates that parts water up to 5 mm high. This scalable synthesis method offers a flexible and rapid approach for the production of numerous moisture-resistant devices including gas sensors, catalysts and perovskite solar cells.

Graphical abstract: Ultraporous superhydrophobic gas-permeable nano-layers by scalable solvent-free one-step self-assembly

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Publication details

The article was received on 18 Dec 2015, accepted on 23 Feb 2016 and first published on 24 Feb 2016


Article type: Paper
DOI: 10.1039/C5NR09000H
Nanoscale, 2016,8, 6085-6093

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    Ultraporous superhydrophobic gas-permeable nano-layers by scalable solvent-free one-step self-assembly

    G. Liu, W. S. Y. Wong, N. Nasiri and A. Tricoli, Nanoscale, 2016, 8, 6085
    DOI: 10.1039/C5NR09000H

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