TL;DR
This paper demonstrates that applying voltage can change the shape and contact angle of soap bubbles on surfaces, suggesting new possibilities for bubble manipulation in microfluidic systems.
Contribution
It introduces the first proof-of-concept of electrowetting on a soap bubble, expanding electrowetting techniques beyond droplets to bubbles.
Findings
Voltages below 40V alter bubble shape and contact angle.
Electrowetting enables bubble transport in microfluidic devices.
Potential for increased volume and speed in bubble-based systems.
Abstract
A proof-of-concept demonstration of the electrowetting-on-dielectric of a sessile soap bubble is reported here. The bubbles are generated using a commercial soap bubble mixture - the surfaces are composed of highly doped, commercial silicon wafers covered with nanometre thick films of Teflon. Voltages less than 40V are sufficient to observe the modification of the bubble shape and the apparent bubble contact angle. Such observations open the way to inter alia the possibility of bubble-transport, as opposed to droplet-transport, in fluidic microsystems (e.g. laboratory-on-a-chip) - the potential gains in terms of volume, speed and surface/volume ratio are non-negligible.
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