Figure 4.

(A) Difference between bulk heating and light-induced local heating on the healing performance. (B) Sequentially triggering the optical healing and the light-controlled shape recovery process for a film of cross-linked PEO/AuNP. (i) Original film with the permanent shape; (ii) temporary shape obtained by folding the film along the lines a₁, a₂, a₃ at 80 °C followed by cooling to room temperature, then two cuts were made as indicated by red arrows (b₁ and b₂ in photo (i); (iii) the b₁ cut was healed by exposing the crack to laser (12 W/cm²) for 5 s; (iv) the first unbending after 10 s laser scanning along the fold a₁ at a power of 6 W/cm², followed by the second unbending under the same condition along the fold a₂; (v) the other cut b₂ remained in the film of an intermediate temporary shape; (vi) the cut b₂ was optically healed under the same condition as for the cut b₁; (vii) the third light-triggered unbending along the fold a₃ completed the permanent shape recovery. Adapted with permission from ref (125). Copyright 2013 American Chemical Society.