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. 2019 Oct 29;9:15520. doi: 10.1038/s41598-019-51642-7

Figure 4.

Figure 4

SEM images of PVA and PVA-Ag nanofibrous webs demonstrate the influence of decreasing applied voltage on fiber structure. Micrographs (a) to (l) show the applied voltage decreases from initial 40 to 15 kV in 5 kV steps.