Figure 4.

Self-healing magnetic polymer composites (3/3). (a) Self-healing polymer based on Fe₃O₄ coated with N-Vinyl-2-pyrroldone (NVP) and vivinylbenzene (DVB), and reacted with fatty acid dimer (reproduced with permission from ChemNanoMat, ACES) [28]. (b) Illustration of the self-healing of a ferrogel prepared from glycol chitosan, oxidized hyaluronate, and iron oxide nanoparticles. The ferrogel was fabricated using a cylindrical-shaped mold (10 mm in diameter, 10 mm in height), and the gels were ground into pieces using a mortar and pestle and placed into the mold for reassembly; after 10 min, self-healed cylinders were obtained (reproduced with permission from Carbohydrate polymers, Elsevier) [29]. (c) Self-healing composite made of Fe₃O₄/cellulose nanocrystals in a 3,4-dihydroxyphenylacetic acid (DOPAC) and polyurethane (PU) matrix (reproduced with permission from Advanced Functional Materials, Wiley) [30].