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. 2021 Oct 18;14(20):6165. doi: 10.3390/ma14206165

Figure 2.

Figure 2

(a) Photos of the twisted HAPAA and HAG11 hydrogels at −20 °C. (b) The original and stretched HAG11 hydrogel at −70 °C. (c) Microscope images of HAG11 hydrogels: (i) original, (ii) cutting off and being contacted immediately, and (iii) self-healing for 3 days at −20 °C. (d) Photos of the original and the self-healed HAG11 hydrogels for 3 days at −20 °C.