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The in vitro release of silver from PVA-silver films as a function of heat-curing tem- perature is illustrated in Figure 7, in which percent silver released is plotted against time The in vitro release of silver from PVA-silver films as a function of heat-curing tem- for films containing 5% w/w silver nitrate, which have been heated for 90 min at 80, 110, perature is illustrated in Figure 7, in which percent silver released is plotted against time 125 or 140 °C. As illustrated, films heated at 80 or 110 °C released about 90% of the silver for films containing 5% w/w silver nitrate, which have been heated for 90 min at 80, 110, Nanomaterials 2021, 11, 96 content very rapidly. When films were heated at 125 °C there was also a rapid initial re- 13 of 19 125 or 140 °C. As illustrated, films heated at 80 or 110 °C released about 90% of the silver lease of ~70% of the silver content. However, when films were heat cured at 140 °C, there content very rapidly. When films were heated at 125 °C there was also a rapid initial re- was an initial release of only ~20% of the silver content and then a gradual release of silver lease of ~70% of the silver content. However, when films were heat cured at 140 °C, there over the following two weeks. was an initial release of only ~20% of the silver content and then a gradual release of silver over the following two weeks. 140 140 120 120 100 100 80 800C 80 60 800C 60 1100C 40 1100C 40 1400C 20 1400C 20 0 00 5 10 15 0 5 Time(Days) 10 15 Time (Days) Figure 7. In vitro release of silver from PVA/silver nitrate films in water as a function of tempera- Figure 7. In vitro release of silver from PVA/silver nitrate films in water as a function of temperature after films with 5% ture after films with 5% silver nitrate loadin◦g have been heated at 80, 110 and 140 °C for 90 min. silver nitrate loaFdiginugreha7v. Ienbveietnrohreealteeadseato8f 0s,il1v1e0r afrnodm14P0VAC/sfiolvre9r0nmitirna.te films in water as a function of tempera- ture after films with 5% silver nitrate loading have been heated at 80, 110 and 140 °C for 90 min. The in vitro Trehleainsevoitfrosirlveleerafsreoomf sPilVvAer-sfrilovmerPfVilAm-sialvsear ffiulnmcstiaosnaoffuhnecatito-cnuorfinhgeattim-cuering temper- whenfilmscaotunrteaiinsiinllgu5st%rawte/dwinsiFlvigeurrneit7r,aitnewhericehhpeeartecednatts1il4v0er°CreilseadsepdicistepdlointteFdigaugraeinsttimefor The in vitro release of silver from PVA-silver films as a function of heat-curing time 8,inwhichfiplemrcsecnotnotafisniilnvger5%relwea/swedsilivseprlnoittreadtea,gwahinicshtthiamve.bTeheenpheloatsedfoflolorw90amsiinmaitla8r0,110,125or when films containing 5% w/w silver nitrate were heated at 140 °C is depicted in Figure 120 ◦◦ pattern to th1a4t0seCen. Ains iFlliugsutreaste6d,afinldm7s, hineattheadt atth8e0aomro1u1n0t oCf rseilevaesreidniatbiaolulyt 9re0l%eaosfedthde es-ilver content 8, in which percent of silver released is plotted against time. The plots follow a similar ◦ approximate~l7y0e%quoaflthineseialcvherccaosen.teTnhte.Hfinoawlepveerrc,ewnthesinlvfielrmrselweaesredhaefattercu1r4edayts1w40asC7,5t,herewasan creases as heat-curing time increases, but after about five days the rate of silver release is 60, 25 and 20in%itfioalrrfeilmeasseheoaftoednlfyo~r2105%, 30o,f4t5heorsi9lv0emr cinonretesnptecatnivdetlhye.n a gradual release of silver over approximately equal in each case. The final percent silver released after 14 days was 75, creases as hevaetr-ycurraipngidtliym. eWinhcerneafislems,sbwuetraeftheeratbeoduattfi1v2e5daCysthtehrerwataesoaflsiolvaerarpeliedaisneitisial release of pattern to that seen in Figures 6 and 7, in that the amount of silver initially released de- ◦ the following two weeks. 60, 25 and 20% for films heated for 15, 30, 45 or 90 min respectively. 120 100 100 80 80 15 minutes 60 15 minutes 60 30 minutes 40 30 minutes 40 45 minutes 45 minutes 20 90 minutes 20 0 00 2 4 6 8 10 0 2 Ti4me (Days)6 8 10 Time (Days) 90 minutes igure 8. In vitro release of silver from PVA/silver nitrate films in water as a function of he Fating time after films with 5% silver nitrate loading have been heated at 140 °C. Figure 8. In vitro release of silver from PVA/silver nitrate films in water as a function of heating Figure 8. In vitro release of silver from PVA/silver nitrate films in water as a function of heating time after films with 5% time after films with 5% silver◦nitrate loading have been heated at 140 °C. silver nitrate loading have been heated at 140 C. The in vitro release of silver from PVA-silver films as a function of heat-curing time when films containing 5% w/w silver nitrate were heated at 140 ◦C is depicted in Figure 8, in which percent of silver released is plotted against time. The plots follow a similar pattern to that seen in Figures 6 and 7, in that the amount of silver initially released decreases as heat-curing time increases, but after about five days the rate of silver release is % Silver released % Silver released % Silver released % Silver releasedPDF Image | Hydrogel Forming Dressings Containing Silver Nanoparticles
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