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. 2019 Apr 4;11(4):627. doi: 10.3390/polym11040627

Figure 4.

Figure 4

Surface morphology of fibers with PDA coating. (a) A blank PP nonwoven; (b) Ag-coated PP nonwoven; (c) PDA-treated (3 h) Ag-coated PP nonwoven; (d) PDA-treated (6 h) Ag-coated PP nonwoven; (e) PDA-treated (9 h) Ag-coated PP nonwoven; and (f) PDA-treated (12 h) Ag-coated PP nonwoven.