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Liquid metals for microscale conductive features. (a) Direct printing of EGaIn liquid metal, a eutectic alloy of gallium (Ga) and indium (In) with a melting point of 15.5 °C; (b) 3D microfluidic channels with 3D-printed liquid metal as the sacrificial template, reprinted from [24] with the permission of John Wiley and Sons, Copyright 2013; (c,d) 3D conductive features directly printed from liquid metals, reprinted from [25] with the permission of John Wiley and Sons, Copyright 2013.
