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Wetting of surfaces made of hydrophobic cavities

Wetting of surfaces made of hydrophobic cavities
Wetting of surfaces made of hydrophobic cavities
Templated electrodeposition through a close packed, monolayer array of 3 ?m polystyrene spheres followed by removal of the template by dissolution in an organic solvent was used to fabricate sphere segment void (SSV) surfaces in gold with heights up to 1.5 ?m. These surfaces were made hydrophobic by treating with 1-dodecanethiol. Contact angle measurements show that the wetting behavior of these surfaces change significantly with film thickness. The apparent advancing contact angle increases from 110° for the flat 1-dodecanethiol-coated gold surface to 150° for the film with a close-packed array of hemispherical cavities, in good agreement with the behavior predicted by the simple Cassie–Baxter equation. In contrast, the apparent receding angles have significantly smaller values in all cases, and water droplets are strongly pinned at the surface. Thus, these surfaces demonstrate “rose petal” behavior, in which a large apparent advancing contact angle, typical of a superhydrophobic surface, is accompanied by significant contact angle hysteresis. Observation of the shapes of drops on the surface during evaporation-driven recession shows that the drops adopt a dodecagonal shape, in which the drop perimeter is selectively pinned along the ?10? and ?11? directions on the hexagonally close-packed surface.
Wetting, Superhydrophobic, Petal Effect, Pinning
0743-7463
9325-9330
Lloyd, Ben P.
5da27ca4-ad70-4280-8000-e15ece365b13
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Wood, Robert J. K.
d9523d31-41a8-459a-8831-70e29ffe8a73
Lloyd, Ben P.
5da27ca4-ad70-4280-8000-e15ece365b13
Bartlett, Philip N.
d99446db-a59d-4f89-96eb-f64b5d8bb075
Wood, Robert J. K.
d9523d31-41a8-459a-8831-70e29ffe8a73

Lloyd, Ben P., Bartlett, Philip N. and Wood, Robert J. K. (2015) Wetting of surfaces made of hydrophobic cavities. Langmuir, 31 (34), 9325-9330. (doi:10.1021/acs.langmuir.5b02107).

Record type: Article

Abstract

Templated electrodeposition through a close packed, monolayer array of 3 ?m polystyrene spheres followed by removal of the template by dissolution in an organic solvent was used to fabricate sphere segment void (SSV) surfaces in gold with heights up to 1.5 ?m. These surfaces were made hydrophobic by treating with 1-dodecanethiol. Contact angle measurements show that the wetting behavior of these surfaces change significantly with film thickness. The apparent advancing contact angle increases from 110° for the flat 1-dodecanethiol-coated gold surface to 150° for the film with a close-packed array of hemispherical cavities, in good agreement with the behavior predicted by the simple Cassie–Baxter equation. In contrast, the apparent receding angles have significantly smaller values in all cases, and water droplets are strongly pinned at the surface. Thus, these surfaces demonstrate “rose petal” behavior, in which a large apparent advancing contact angle, typical of a superhydrophobic surface, is accompanied by significant contact angle hysteresis. Observation of the shapes of drops on the surface during evaporation-driven recession shows that the drops adopt a dodecagonal shape, in which the drop perimeter is selectively pinned along the ?10? and ?11? directions on the hexagonally close-packed surface.

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More information

Published date: 12 August 2015
Keywords: Wetting, Superhydrophobic, Petal Effect, Pinning
Organisations: Chemistry, Engineering Science Unit, Electrochemistry, nCATS Group, Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 381435
URI: http://eprints.soton.ac.uk/id/eprint/381435
ISSN: 0743-7463
PURE UUID: c62ef055-2632-4407-9e7d-f3119b51db91
ORCID for Philip N. Bartlett: ORCID iD orcid.org/0000-0002-7300-6900
ORCID for Robert J. K. Wood: ORCID iD orcid.org/0000-0003-0681-9239

Catalogue record

Date deposited: 30 Sep 2015 15:33
Last modified: 18 Feb 2021 16:43

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Author: Ben P. Lloyd

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