Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
4 years ago

Magnetic actuation of discrete liquid entities with a deformable paramagnetic liquid substrate

Masayuki Hayakawa, Jacopo Vialetto, Nikita Kavokine, Mathieu Morel, Manos Anyfantakis, Damien Baigl, Sergii Rudiuk, Subramanyan Namboodiri Varanakkottu, Masahiro Takinoue
Magnetic actuation of drops has mainly relied on volume forces exerted on the liquid to be transported, which is poorly efficient with conventional diamagnetic liquids such as water or oil, unless magnetosensitive particles are added. Here, we describe a new way to magnetically control the motion of discrete liquid entities, in an additive-free and surface tension-independent manner. Our strategy consists of using a paramagnetic liquid as a deformable substrate to direct, using a magnet, the motion of various floating liquid entities, ranging from naked drops to liquid marbles. We show that a broad variety of liquids, including diamagnetic (water, oil) and nonmagnetic ones can be efficiently transported using the moderate magnetic field (≈ 50 mT) produced by a cost-effective, cm-sized permanent magnet. Complex trajectories can be achieved in a reliable manner and multiplexing potential is demonstrated through on-demand drop fusion.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201710668

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