Electrowetting of liquid marbles

Newton, M.I. ORCID: 0000-0003-4231-1002, Herbertson, D.L., Elliott, S.J., Shirtcliffe, N.J. and McHale, G., 2007. Electrowetting of liquid marbles. Journal of Physics D - Applied Physics, 40 (1), pp. 20-24. ISSN 0022-3727


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Electrowetting of water drops on structured superhydrophobic surfaces are known to cause an irreversible change from a slippy (Cassie-Baxter) to sticky (Wenzel) regime. An alternative approach to using a water drop on a super-hydrophobic surface to obtain a non-wetting system is to use a liquid marble on a smooth solid substrate. A liquid marble is a droplet coated in hydrophobic grains, which therefore carries its own solid surface structure as a conformal coating. Such droplets can be considered as perfect non-wetting systems having contact angles to smooth solid substrates of close to 180°. In this work we report the electrowetting of liquid marbles made of water coated with hydrophobic Lycopodium grains and show that the electrowetting is completely reversible. Marbles are shown to return to their initial contact angle for both ac and dc electrowetting and without requiring a threshold voltage to be exceeded. Furthermore, we provide a proof-of-principle demonstration that controlled motion of marbles on a finger electrode structure is possible.

Item Type: Journal article
Description: Post-print
Publication Title: Journal of Physics D - Applied Physics
Creators: Newton, M.I., Herbertson, D.L., Elliott, S.J., Shirtcliffe, N.J. and McHale, G.
Publisher: Institute of Physics Publishing
Place of Publication: Bristol
Date: 2007
Volume: 40
Number: 1
ISSN: 0022-3727
Rights: Copyright ©2007 IOP Publishing Ltd.
Divisions: Schools > School of Science and Technology
Record created by: EPrints Services
Date Added: 09 Oct 2015 09:59
Last Modified: 09 Jun 2017 13:16
URI: https://irep.ntu.ac.uk/id/eprint/5964

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