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Issue 1, 2017
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Apparent contact angle and contact angle hysteresis on liquid infused surfaces

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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.

Graphical abstract: Apparent contact angle and contact angle hysteresis on liquid infused surfaces

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Publication details

The article was received on 18 Apr 2016, accepted on 18 May 2016 and first published on 18 May 2016


Article type: Paper
DOI: 10.1039/C6SM00920D
Author version available: Download Author version (PDF)
Citation: Soft Matter, 2017,13, 101-110
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    Apparent contact angle and contact angle hysteresis on liquid infused surfaces

    C. Semprebon, G. McHale and H. Kusumaatmaja, Soft Matter, 2017, 13, 101
    DOI: 10.1039/C6SM00920D

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