Electric field induced reversible spreading of droplets into films on lubricant impregnated surfaces

Brabcova, Zuzana, McHale, Glen, Wells, Gary, Brown, Carl and Newton, Michael (2017) Electric field induced reversible spreading of droplets into films on lubricant impregnated surfaces. Applied Physics Letters, 110 (12). p. 121603. ISSN 0003-6951

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Official URL: http://dx.doi.org/10.1063/1.4978859


Electric fields can be used to force a droplet to wet a solid surface using an applied voltage. However, significant hysteresis usually occurs associated with pinning forces at the contact line. Here we report the forced spreading and subsequent retraction of droplets into liquid films in air on lubricant impregnated surfaces (also known as slippery liquid infused porous surfaces, SLIPS) where the contact line is completely mobile. We first confirm that we achieve a complete removal of hysteresis for the electrowetting of droplets above the saturation voltage. We then show that contact angle hysteresis can be reduced to less than 4° whilst retaining the ability to fully spread a droplet into a liquid film using an interface localized from of liquid dielectrophoresis (dielectrowetting). In both cases, we find that the cosine of the contact angle has a quadratic dependence on applied voltage, consistent with previous theoretical expectations. Thus, our work demonstrates that fully reversible spreading encompassing a wide range of partial wetting droplet states and a film state can be achieved in air in a controllable manner with very low levels of hysteresis.

Item Type: Article
Uncontrolled Keywords: Electrowetting, dielectrowetting, droplets, contact angles, lubricant impregnated surface, SLIPS
Subjects: H600 Electronic and Electrical Engineering
J500 Materials Technology not otherwise specified
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Paul Burns
Date Deposited: 08 Mar 2017 10:38
Last Modified: 01 Aug 2021 05:18
URI: http://nrl.northumbria.ac.uk/id/eprint/30059

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