Figure 2.

a) Schematic illustration showing the preparation of thin cross‐sectional metallic wires via local phase manipulation of liquid metal and subsequent stretching of the fiber, b) plot of the average cross‐sectional diameter of solidified gallium wires as a function of the strain applied to the fiber over five measurements, c) optical microscope image of the thinnest cross‐sectional metallic wire, and d) tensile stress–strain plots of the polymeric fibers with variable stiffness depending on phase of the metallic core. Tensile stress–strain plots of an empty SEBS fiber and liquid Ga filled fiber are nearly identical, as shown in Figure S1 of the Supporting Information.