Fig. 4From: Synthesis and characterisation of microcapsules for self-healing dental resin composites(A) SEM image of ≤150 μm microcapsules, also a ruptured microcapsule can be seen. (B) A higher magnification SEM image of the capsular shell, demonstrating a smooth outer shell with deposits of poly(urea-formaldehyde) nanoparticlesBack to article page