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. 2019 Nov 28;9:17773. doi: 10.1038/s41598-019-54242-7

Figure 1.

Figure 1

Schematic of the self-healing process using embedded microcapsules. (a) A crack forms in the matrix due to damage; (b) the growing crack ruptures microcapsules in its path, thereby releasing the healing agent into the crack plane; (c) polymerization occurs and the crack faces are bonded closed3.