Jump to main content
Jump to site search


Anisotropic behaviours of droplets impacting on dielectrowetting substrates

Author affiliations

Abstract

The spreading of a sessile droplet on a solid substrate is enhanced if a non-uniform electric field is applied at the contact-line region. This so-called dielectrowetting effect holds great potential in controlling the spreading of droplets by varying the strength of the electric field. In this paper, we experimentally and theoretically study the effect of the dielectrowetting on the dynamics of droplets impacting on a solid surface having electrodes to impose the non-uniform electric field to the liquid. We experimentally study the anisotropic behaviours in both the spreading and retracting stages: the droplets spread more but retract with significantly smaller rates in the direction parallel to the electrodes. We provide a theoretical explanation for the spreading enhancement caused by dielectrowetting by decoupling it from inertia-induced spreading. We also theoretically account for the reduction in retraction rate using force balance at the contact line. The theoretical analysis in both the spreading and retracting stages is verified experimentally.

Graphical abstract: Anisotropic behaviours of droplets impacting on dielectrowetting substrates

Back to tab navigation

Article information


Submitted
25 Nov 2019
Accepted
07 Feb 2020
First published
13 Feb 2020

Soft Matter, 2020, Advance Article
Article type
Paper

Anisotropic behaviours of droplets impacting on dielectrowetting substrates

Q. Vo, Y. Fujita, Y. Tagawa and T. Tran, Soft Matter, 2020, Advance Article , DOI: 10.1039/C9SM02322D

Social activity

Search articles by author

Spotlight

Advertisements