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(a) The resistance values of the hydrogel under bending and relaxing states; the bending radius was 5 mm. (b) Resistance of the hydrogel changes as a function of repeated healing cycles. The inset photographs showed that the hydrogel conductor can self-heal in the circuit. The tested hydrogel in (a,b) was PTFe-2 (pH 3.3). (c) PDDA/TA/Fe3O4 magnetic gel as a power switch in the circuit.
