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SEM images of the unloaded (A-1–A-8) hydrogel beads. Figures A-1 and A-2 display CS-TPP particles and their surface details. Layered CS-TPP beads with kCG for 1 h, 3 h, and 6 h are illustrated in figures A-3, A-5 and A-7, respectively, while their detailed surface textures are depicted in figures A-4, A-6 and A-8.
