Published in

National Academy of Sciences, Proceedings of the National Academy of Sciences, 46(118), 2021

DOI: 10.1073/pnas.2111291118

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Programmable droplet manipulation and wetting with soft magnetic carpets

This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

Significance A set of magnetically responsive, soft hairs, which form a soft magnetic carpet, can be infused with a liquid to achieve switchable wetting. Applying a pattern of magnetic field results in a reconfigurable wetting pattern on the soft magnetic carpet. Combining this switchable wetting with a travelling magnetic field wave can allow us to spatially manipulate droplets. The efficiency of the droplet manipulation depends on the size and the contact angle of the droplet, which allows a pathway to sort and separate different droplets. Temporal and spatial control over multiple droplets allows us to conduct droplet reactions, which has a potential to be used for automated analytical testing and screening.