Static and dynamic optical analysis of micro wrinkle formation on a liquid surface

Saxena, A., Tsakonas, C. ORCID: 0000-0002-7342-3405, Chappell, D. ORCID: 0000-0001-5819-0271, Cheung, C.S., Edwards, A.M.J., Liang, H. ORCID: 0000-0001-9496-406X, Sage, I.C. and Brown, C.V. ORCID: 0000-0002-1559-3238, 2021. Static and dynamic optical analysis of micro wrinkle formation on a liquid surface. Micromachines, 12 (12): 1583. ISSN 2072-666X

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Abstract

A spatially periodic voltage was used to create a dielectrophoresis induced periodic micro wrinkle deformation on the surface of a liquid film. Optical Coherence Tomography provided the equilibrium wrinkle profile at submicron accuracy. The dynamic wrinkle amplitude was derived from optical diffraction analysis during sub-millisecond wrinkle formation and decay, after abruptly increasing or reducing the voltage, respectively. The decay time constant closely followed the film thickness dependence expected for surface tension driven viscous levelling. Modelling of the system using numerical solution of the Stokes flow equations with electrostatic forcing predicted that wrinkle formation was faster than decay, in accord with observations.

Item Type: Journal article
Publication Title: Micromachines
Creators: Saxena, A., Tsakonas, C., Chappell, D., Cheung, C.S., Edwards, A.M.J., Liang, H., Sage, I.C. and Brown, C.V.
Publisher: MDPI
Date: 19 December 2021
Volume: 12
Number: 12
ISSN: 2072-666X
Identifiers:
NumberType
10.3390/mi12121583DOI
1504873Other
Rights: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Divisions: Schools > School of Science and Technology
Record created by: Laura Ward
Date Added: 07 Jan 2022 09:26
Last Modified: 07 Jan 2022 09:26
URI: http://irep.ntu.ac.uk/id/eprint/45181

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