Fig. 10. SEM images: (A and B) first-layer; (C and D) second-layer; (E and F) third-layer of a commercial three-layered surgical mask coated with 1% GS5. (A), (C) and (E) have a magnification of 150×. White boxes in (A), (C), and (E) is magnified by 1000×, as shown in (B), (D), and (F). This figure is reproduced from ref. 100 with permission from Taylor & Francis, copyright 2016.
