CUED Publications database

Influence of polarization on contact angle saturation during electrowetting

Jiang, C and Ma, H and Hasko, DG and Nathan, A (2016) Influence of polarization on contact angle saturation during electrowetting. Applied Physics Letters, 109. ISSN 0003-6951

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© 2016 Author(s). Electrowetting is widely used to manipulate liquids on a dielectric surface by changing the wettability of the solid-liquid interface using an externally applied electric field. While the contact angle can be adequately predicted at low fields using Lippmann's model, there is a large disagreement with experimental behavior at high fields, where the contact angle saturates. Previous attempts to explain this saturation effect (by considering a range of different mechanisms) have led to models that are applicable only to limited field ranges. Here, we use a model for the solid-liquid interfacial surface energy (based on a dipole-dipole interaction) to describe electrowetting and find that this explains the contact angle change at both low (continuous change) and high (saturation) fields. The model is compared with measured contact angle changes for both water and ethylene glycol liquids, with good agreement over the whole field range.

Item Type: Article
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:30
Last Modified: 19 Jul 2018 06:47