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(a) PET-based surgical mask developed in this work (top) and a commercial surgical mask (bottom). (b) Macroscopic detail of the layers that make up the PET-based mask and (c) SEM views of the external layers and (d) the filter. (e) Macroscopic detail of the layers that make up the commercial surgical mask and (f) SEM views of the external layers and (g) the filter placed in the middle.
