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Polymers 2020, 12, 440 5 of 15 showed that the increase of the reaction time lead to part of Ag+ continues to be reduced in situ in existing nanoparticles, deepen the austenitic maturity of Ag-NPs [34], thereby the Ag-NPs size enlarged. The distribution curve of Ag-NPs reacted for 4 h was closer to the normal distribution, and Polymers 2020, 12, 440 5 of 15 the amount of silver nanoparticles increased remarkably within the visible range, indicating that more Ag+ was reduced to Ag-NPs. When PVP formed a coating on the surface of Ag-NPs, the agglomeration indicating that more Ag+ was reduced to Ag‐NPs. When PVP formed a coating on the surface of Ag‐ process effectively reduced, thus the size of the silver nanoparticles was stabilized within a certain NPs, the agglomeration process effectively reduced, thus the size of the silver nanoparticles was range and closer to the normal distribution. stabilized within a certain range and closer to the normal distribution. (a) (b) 60 50 40 30 20 10 0 140 120 100 80 60 40 20 2.75 4.25 5.75 Diameter range (nm) 10.25 90.79% 7.25 8.75 0 6.75 10.25 13.75 17.25 20.75 24.25 27.75 31.25 34.75 Diameter range (nm) 82.29% (c) Figure 1. Morphology of Ag‐NPs: (a,b) TEM graph and particle size distribution of Ag‐NPs reacted 1 (d) Figure 1. Morphology of Ag-NPs: (a,b) TEM graph and particle size distribution of Ag-NPs reacted 1hh;;(c(c,d,d))TTEEMggrraapphhaannddppaarrtitciclelessizizeeddisisttrribibuttioionnooffAgg‐-NPssrreeacctteed4h.. ThheeFTFITRIRspescptreucmtrusm(Fsigu(Freig2uar)esh2oaw)esdhtohwePedVPtshteretPcVhiPngsvtribertcahtiionngpevaibkroafti–oOnHpaetakpporofx–imOaHtelayt −1 sbtroetthchliinegs.vTibhreatCio=nOpsetraektschaitnPgVvPibsrpaeticotnrupmeawksasat1P65V5Pcsmpec,trwuhmerweast1h6e55pecmako,fwshilevrerawstahsespliegahktloyf bsliulveesrhwifat sinslAiggh-tNlyPbs/lPueVPsh, wifthiinchAigs‐sNimPsi/laPrVtPo, twhahticdhesiscrsiibmeidlairntroetlahtaetddleitsecraibtuedrein[35re].laTtehdislistuergagteusrte t[h3e5]c.oTohrdisinsuagtigoenstotfhOecaotomrdiinaPtiVonPoafnOdaAtogmationmPVonPtahnedsAurgfacteomofoAngt-hNePssu,rlfeaacdeionfgAtgo‐bNlPuse,slehaifdtionfg −1 −1 −1 −1 3a4p3p0rcomximantedlyth3e4s3t0rectcmhinganvdibtrhaetiosntrpetecahkisnogfv–iCbHraatitoanppreoaxkismoafte–lCyH295a0t campproinxibmoathtelliyne2s9.5T0hcemC=Oin −1 tthoebPluVePsahbifstoorpftihoenPpVePakabtoso1r6p6t9iocnmpea(kshtow16n69incmFigu(sreho2wb)n. TinheFilgauctraem2bg)r.oTuhpeolafcPtaVmPgarto1u4p23ocfmPVP −1 aantd1412389cmcmanwde1r2e8s9licgmhtlywredre-sshligfthetdlywrheedn‐sbhlieftnedewdhweinthbAlegn-dNePdsw,tihtherAegas‐NonPsw,athseNreaatosomnownatshNe −1 −1 −1 lactotamognrotuhpe claocotradminagtreoduopnctohoeredminpatyedorobnitathl oefetmhepAtygoartboimta.lTohfethexeisAtegnacetoomf .thTehcehemxisicteanl bceonodfinthge Nch:Aemg:OicaalnbdoOnd:Aing:ONw:Aitgh:Oin athnedPOV:PAgm:OakwesithienAthg-eNPPVsP/PmVPaksetasbtlheeaAndg‐hNaPrds/tPoVaPggsltoambleranted[3h6a]r.d to agglTomheerXaRteD[3p6a].tterns (Figure 3) showed 2θ at approximately 22◦ were the diffuse peaks of PVP and Ag-NPs/PVP samples. The diffraction peaks at 2θ = 38◦, 44◦, 64.3◦, and 77.3◦ in Ag-NPs/PVP curve correspond to the face-centered cubic (FCC) silver plane (111), (200), and (220), respectively. The average crystal size of Ag-NPs estimated by Scherrer formula was 14.88 nm, which was consistent with the actual silver nanoparticles size range (13–28 nm) observed by TEM. The analysis results show that the small size Ag-NPs protected by PVP exist stably in DMAc solution. −1 −1 Count (a.u.) Count (a.u.)PDF Image | One-Pot Synthesis of Antibacterial Silver Nanoparticle
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