Projects per year
Abstract
Programmable fluidic systems on curved and flexible substrates are of increasing interest. One approach to achieving programmability is the controlled sequential wetting and dewetting on a surface using voltage actuation. In particular, liquid dielectrophoresis techniques have recently been shown to provide the ability to form a spread liquid film on a normally liquid repellent, but rigid, substrate via applying a spatially periodic electrical potential underneath an initial sessile droplet. In this work, we demonstrate the creation of thin, rectangular shaped, films of electrically insulating liquid on the side of a curved and flexible, liquid repellant substrate using dielectrophoresis forces. We find that the experimental threshold voltage VT(κs) for film formation has a monotonic dependence on the value of the substrate curvature κs in the range –0.4 mm-1< κs < 0.26 mm-1. By considering the balance of stresses acting on the films, including the LaPlace pressure and the Maxwell stress, we develop an analytical theoretical expression that is in excellent quantitative agreement with our curvature dependent experimental threshold voltage measurements. The resulting physical insights and demonstration of programmable wettability on curved and flexible substrates with both positive and negative curvature provides the foundations for applications in imaging, displays, and biochemical analysis.
Original language | English |
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Article number | 191601 |
Journal | Applied Physics Letters |
Volume | 120 |
Issue number | 19 |
Early online date | 10 May 2022 |
DOIs | |
Publication status | E-pub ahead of print - 10 May 2022 |
Keywords / Materials (for Non-textual outputs)
- LIQUID DROPLETS
- Wetting
- Dielectrophoresis
- Maxwell stress
- LaPlace pressure
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Dive into the research topics of 'Dielectrowetting on curved surfaces'. Together they form a unique fingerprint.Projects
- 2 Finished
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Dynamic Dewetting: Designing and Breaking Novel Morphologies of Liquid Films
McHale, G., Ledesma Aguilar, R. & Wells, G.
27/07/20 → 26/02/22
Project: Research
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Dynamic Dewetting: Designing and Breaking Novel Morphologies of Liquid Films
McHale, G., Wells, G. & Ledesma Aguilar, R.
26/11/18 → 26/07/20
Project: Project from a former institution