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Water contact angles of SS/PVA (a), PDA-SS/PVA (b), and AgNPs-PDA-SS/PVA (c). Swelling ratio of these films (d) (n = 3 per group; * indicates significant differences compared with SS/PVA film at p < 0.05, ** indicates significant differences compared with SS/PVA film at p < 0.01).
