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SEM images of hydrogels: (a) PVA_L-arg:CS 90:10; (b) PVA_L-arg:CS 75:25; (c) PVA_L-arg:CS 60:40; (d) PVA_Caff:CS 90:10; (e) PVA_Caff:CS 75:25; (f) PVA_Caff:CS 60:40; (g) PVA_L-arg_Caff:CS 90:10; (h) PVA_L-arg_Caff:CS 75:25; (i) PVA_L-arg_Caff:CS 60:40; (j) PVA_Z_L-arg:CS 75:25; (k) PVA_Z_Caff:CS 75:25; (l) PVA_Z_L-arg_Caff:CS 75:25.
