“…Recently, gallium-based liquid metal alloys have been of interest in various science and engineering fields due to their favorable material properties such as non-toxicity, high thermal and electrical conductivity as well as their liquid property at room temperature [7,8]. Based on these preferable properties, gallium-based liquid metal alloys have been utilized for various applications including heat transfer [9], flexible electrodes [10][11][12][13], interconnects [14][15][16], tunable/ stretchable antennas [17][18][19][20][21], reconfigurable metamaterials [22,23] and filter [24]. Most of these works were demonstrated using a ternary alloy Galinstan ® or a binary alloy GaIn [25,26] filled in microfluidic channels made of an elastomer (PDMS or Ecoflex ® ).…”