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Capsule-based self-healing systems: (A) single capsules, (B) capsule (green)/dispersed catalyst (orange), (C) phase-separated droplet/capsules (green), (D) double-capsule (blue capsules with hardener, red capsules with healing agent) and (E) all-in-one microcapsules (multiple shell walls depicted with different colors) (Adapted with permission from Elsevier [170]).
