The University of Southampton
University of Southampton Institutional Repository

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.

This record has no associated files available for download.

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: 15 Mar 2024 02:47

Export record

Altmetrics

Contributors

Author: Ben P. Lloyd

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×