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(a) Photographs showing the self-healing ability of the PTFe-2 (pH 3.3) hydrogel. The bright-green hydrogel was doped with pyranine, and the photographs were taken under UV light (wavelength 365 nm). (b) Quantitative tests of the self-healing properties of the PTFe-2 hydrogel (pH 3.3). Strain was increased from 1 to 1000% at 1 Hz, and the recovery was monitored at 1% strain with 1 Hz.
