Figure 24.

(A) The fabrication process of PDMS-COOH-Fe₃O₄ sample. Schematic diagram of the structure of PDMS-COOH and the preparation of PDMS-COOH-Fe₃O₄. (B) (i) the photograph of the sunflowers; (ii) the photograph of a bionic sunflower made by the composite film; (iii,iv) the actuation of the bionic sunflower with or without a magnet bar. (C) Digital photos showing a complete self-healing process of this film under an ambient condition. (D) self-healing display of the polymer film (30 × 6 × 0.9 mm³) under an ambient condition during the magnetic actuation. Adapted with permission from ref (234). Copyright 2022 John Wiley and Sons.