Apparent contact angle and contact angle hysteresis on liquid infused surfaces

Semprebon, Ciro, McHale, Glen and Kusumaatmaja, Halim (2017) Apparent contact angle and contact angle hysteresis on liquid infused surfaces. Soft Matter, 13 (1). pp. 101-110. ISSN 1744-6848

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Official URL: http://dx.doi.org/10.1039/C6SM00920D

Abstract

We theoretically investigate the apparent contact angle and contact angle hysteresis of a droplet placed on a liquid infused surface. We show that the apparent contact angle is not uniquely defined by material parameters, but also has a dependence on the relative size between the droplet and its surrounding wetting ridge formed by the infusing liquid. We derive a closed form expression for the contact angle in the limit of vanishing wetting ridge, and compute the correction for small but finite ridge, which corresponds to an effective line tension term. We also predict contact angle hysteresis on liquid infused surfaces generated by the pinning of the contact lines by the surface corrugations. Our analytical expressions for both the apparent contact angle and contact angle hysteresis can be interpreted as ‘weighted sums’ between the contact angles of the infusing liquid relative to the droplet and surrounding gas phases, where the weighting coefficients are given by ratios of the fluid surface tensions.

Item Type: Article
Subjects: F100 Chemistry
F200 Materials Science
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Nicola King
Date Deposited: 26 May 2016 10:36
Last Modified: 01 Nov 2017 20:05
URI: http://nrl.northumbria.ac.uk/id/eprint/26954

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