Static and Dynamic Optical Analysis of Micro Wrinkle Formation on a Liquid Surface.

Static and Dynamic Optical Analysis of Micro Wrinkle Formation on a Liquid Surface.
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DOI:
10.3390/mi12121583
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发表时间:
2021-12-19
期刊:
影响因子:
3.4
通讯作者:
Brown CV
Brown CV
中科院分区:
工程技术3区
文献类型:
--
作者:
Saxena A;Tsakonas C;Chappell D;Cheung CS;Edwards AMJ;Liang H;Sage IC;Brown CV

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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.
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