Multi-droplets non-coalescence on open-chip electrowetting platform
Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore, India
Accepted: 15 August 2022
Published online: 15 September 2022
The droplet non-coalescence is an interesting phenomenon that is observed in nature. This phenomenon of non-coalescence is slightly counter-intuitive as we expect liquid interfaces of the same surface tension to merge when they come in contact. However, with the help of modulating oil film in between the liquid interface, non-coalescence is observed for long durations. In this work, we have achieved the non-coalescence of multiple compound droplets on a coplanar EWOD device. The effect of droplet volume on the non-coalescence phenomenon has been studied in two-droplet systems. We have obtained the non-coalescence regime map for different operating parameters of applied voltage and frequency. We have also explored three-droplet systems and obtained a non-coalescence regime. This open-chip coplanar EWOD device configuration can be used to scale up this phenomenon to multiple droplets.
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