Hollow poly(SEBS) fibers (Kraton G1643) were created by melt spinning, and subsequently, their hollow cores were filled fully with molten gallium via injection with a plastic needle-tipped syringe at ambient pressure. In this way, the gallium core matched the inner dimensions of the polymer fiber (0.85 mm) as closely as possible. Previous studies have discussed the adhesion of molten metal with polymeric substrates (41). The gallium was then solidified at room temperature by insertion of a copper wire (previously sanded with sandpaper and dipped in 0.1 M hydrocholoric acid) into the molten gallium at one end of the fiber while the fiber was held straight by taping each end lightly to cardstock. The ends of the fiber were sealed with NOA 63 optical adhesive.

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