Influence of polarization on contact angle saturation during electrowetting
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Publication Date
2016-11-21Journal Title
Applied Physics Letters
ISSN
0003-6951
Publisher
AIP Publishing
Volume
109
Issue
21
Language
English
Type
Article
This Version
AM
Metadata
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Jiang, C., Ma, H., Hasko, D., & Nathan, A. (2016). Influence of polarization on contact angle saturation during electrowetting. Applied Physics Letters, 109 (21)https://doi.org/10.1063/1.4968189
Abstract
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.
Sponsorship
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (645760)
European Commission Horizon 2020 (H2020) Research Infrastructures (RI) (692373)
Isaac Newton Trust (Minute 1338(i))
EPSRC (EP/M013650/1)
Identifiers
External DOI: https://doi.org/10.1063/1.4968189
This record's URL: https://www.repository.cam.ac.uk/handle/1810/262294
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