Channel-Free Control of Eutectic Gallium-Indium Droplets by Magnetically Active Microwall Arrays

다국어 초록 (Multilingual Abstract)

Eutectic Gallium-Indium (EGaIn) is quickly emerging as wirelessly controlled conducting material for alternatives to mercury since it remains in a liquid state at room temperature without toxicity. In this presentation, we suggest a novel method to spatially control EGaIn droplet by contactless magnetic actuation of magnetically responsive microwall arrays. The microwalls consisted with polydimethylsiloxane (PDMS) and iron particles have a large aspect ratio (＞7). Since the bottom part of the microwall is fixed by magnetically inert neat PDMS substrate, the top part of the microwall bends upon response to an external magnetic field. To implement effective EGaIn droplet transportation, we will discuss various parameter studies related to the bending actuation of microwall arrays throughout iterative bending cycles. Furthermore, merger of two EGaIn droplets was demonstrated by managing transportation direction of the droplets.