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Hydrogel Forming Dressings Containing Silver Nanoparticles

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Hydrogel Forming Dressings Containing Silver Nanoparticles ( hydrogel-forming-dressings-containing-silver-nanoparticles )

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Nanomaterials 2021, 11, x FOR PEER REVIEW 8 of 20 Nanomaterials 2021, 11, 96 8 of 19 nitrate loading. (Figure 5A,B). A similar swelling profile was observed for films cured at 110 °C, except that the films dissolved more slowly than the films cured at 80 °C (Figure ◦ 5FCo,rDe)x.aFmorpelex,aamftpelrec,uarftinergcautr1in1g0 aCt 1f1o0r°2C.5fho,rt2h.e5 2h0,0thμem20-t0hμicmk -fitlhmicskcfoilnmtasincoingta1in%insgilv1e%r nitrate or 5% silver nitrate remained approximately 60% and 300% swollen respectively silver nitrate or 5% silver nitrate remained approximately 60% and 300% swollen respec- (Figure 5D). Furthermore, for films cured at 110 ◦C the degree of swelling was larger when tively (Figure 5D). Furthermore, for films cured at 110 °C the degree of swelling was larger these films were loaded with 5% silver nitrate (only) and when the films were thicker when these films were loaded with 5% silver nitrate (only) and when the films were (200 μm). The 5% silver nitrate/110 ◦C/200 μm-thick films failed to fully dissolve and thicker (200 μm). The 5% silver nitrate/110 °C/200 μm-thick films failed to fully dissolve remained 200% swollen after five hours and 50% swollen after 24 h. Curing at 140 ◦C in the and remained 200% swollen after five hours and 50% swollen after 24 h. Curing at 140 °C case of both 3% and 5% silver loadings resulted in films that swelled slowly after 2.5 h by in the case of both 3% and 5% silver loadings resulted in films that swelled slowly after approximately 1400% and 2600% in 100 and 200 μm-thick films respectively (Figure 5E,F). 2.5 h by approximately 1400% and 2600% in 100 and 200 μm-thick films respectively (Fig- These films remained very swollen and had only dissolved to a ~600% swollen level after ure 5E,F). These films remained very swollen and had only dissolved to a ~600% swollen 100 h, remaining swollen to almost the same extent after 250 h. However, films cured at level after 100 h, remaining swollen to almost the same extent after 250 h. However, films 140 ◦C with 1% silver loading swelled quickly and dissolved to approximately the original cured at 140 °C with 1% silver loading swelled quickly and dissolved to approximately dry weight after four hours. the original dry weight after four hours. 500 400 300 200 100 0 0 5 10 15 20 25 30 no heat 5% silver nitrate 1% silver nitrate 3% silver nitrate 5% silver nitrate -100 -200 Time (hours) (A) Figure 5. Cont. Weight of film (% of original)

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