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Issue 24, 2013
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Bioinspired hierarchical superhydrophobic structures formed by n-paraffin waxes of varying chain lengths

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Abstract

Nature demonstrates beautiful examples of superhydrophobic surfaces, which always exhibit hierarchical roughness. We demonstrate a simple biomimetic route to the formation of hierarchical roughness on paraffin wax surfaces by the successive deposition of waxes of increasing molecular weight (Mw). By means of this procedure the lower Mw waxes grow larger crystals, forming higher micro-roughness, the subsequently deposited higher Mw waxes produce lower submicron/nano-roughness, and the overall result is roughness of a higher hierarchical order. We show that, compared to unary wax crystal surfaces, these hierarchical structures have the advantage of increased surface stability expressed by the ability to maintain smaller drops in the Cassie-state, as well as the ability to support liquids having lower surface tensions with contact angles exceeding 150°.

Graphical abstract: Bioinspired hierarchical superhydrophobic structures formed by n-paraffin waxes of varying chain lengths

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Article information


Submitted
28 Oct 2012
Accepted
12 Apr 2013
First published
13 May 2013

Soft Matter, 2013,9, 5710-5715
Article type
Paper

Bioinspired hierarchical superhydrophobic structures formed by n-paraffin waxes of varying chain lengths

S. Pechook and B. Pokroy, Soft Matter, 2013, 9, 5710
DOI: 10.1039/C3SM27484E

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