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(A) Liquid-metal droplets (LMDs) floating in hydrogel with varied diameters; (a) 60 μm, (b) 90 μm, (c) 160 μm, (d) 210 μm. Reproduced with permission from [38]; (B) LMDs assembly fabricated through injection way. Reproduced with permission from [39]; (C) Microscopic image showing a single layer of liquid metal micro-droplets closely sitting together with thin interface between each other. Reproduced with permission from [39].
