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The scheme of Ag‐NPs growth and cross‐link with cellulose in film‐forming process were summarized as shown in Figure 4b. The average size of Ag‐NPs calculated by XRD patterns (Figure 5) is larger than the average particle size of Ag‐NPs in Ag‐NPs/PVP solution, demonstrating that Ag‐ NPs continued to grow within film formation process. The –SH group in MPTS reacted with Ag to form a better bonding structure (Figure 4a), and the siloxane group of MPTS was bonded to cellulose Polymers 2020, 12, 440 7 of 15 [37,38]. The chemical bonding effect of MPTS makes cellulose and Ag‐NPs more easily cross‐linked. It can be seen that some nanoparticles exist on the cross‐section of the CANF0.04 compared with RCF cros(sF-liignukred4es,tfr)u. Tchtuerse,paanrdtictlheesrceomwbeirneesdowmiethocfehllyudlorsoegfeonrmboingdasmbeutlwtileaeynercAelglu‐MloPsTeSc‐hCaeilnlusltohsaetcwroesrse‐ not brokleinkbedy tshtreucrtuosres,-lainkdetdhesrtreuwcteurree.soTmheroefohryed, rthogeetnwboopnrdoscebsestewseoefnAcegl-lNulPosegcrohwainths athnadt cwroerses-nliontking broken by the cross‐linked structure. Therefore, the two processes of Ag‐NPs growth and cross‐ with cellulose during the one-pot synthesis were conducted simultaneously. Ag-NPs-MPTS existed on linking with cellulose during the one‐pot synthesis were conducted simultaneously. Ag‐NPs‐MPTS the surface and partly formed an agglomeration structure. This can be proven because the RCF surface existed on the surface and partly formed an agglomeration structure. This can be proven because the was smooth, whereas a mass of spherical nanoparticles appeared on the CANF0.04 surface (Figure 4c,d), RCF surface was smooth, whereas a mass of spherical nanoparticles appeared on the CANF0.04 surface and some of them agglomerated into larger particles. However, a uniform cellulose-Ag-NPs composite (Figure 4c,d), and some of them agglomerated into larger particles. However, a uniform cellulose‐ film was successfully prepared before Ag-NPs-MPTS agglomerated excessively. Ag‐NPs composite film was successfully prepared before Ag‐NPs‐MPTS agglomerated excessively. OCH3 Si OCH3 OCH3 Figure 4. Reaction process and surface morphology of films: (a) Reaction scheme of Ag-MPTS-Cellulose cross-linked structure; (b) Reaction process of films; (c,e) SEM graphs of RCF and CANF0.04 surface; (d,f) SEM graphs of RCF and CANF0.04 cross-section. The crystal lattice of the obtained cellulose films was type II (Figure 5), and more silver crystal peaks appeared in the spectrum. The average particle size of the Ag-NPs in CANF0.01 to CANF0.08 was increased by calculation, whereas the cellulose crystallinity was declined. There is a correlation between the two tendencies: the increase of Ag-NPs concentration in film fabrication process caused the nanosilver particles more easily to agglomerate, and the average particle size increased. In addition, (a) OCH3 Ag + HS Si OCH3 Ag S Cellulose Chain AgS SiO* OCH3 O + OH * O AgS O O * O OH OH * O * * OH HOPDF Image | One-Pot Synthesis of Antibacterial Silver Nanoparticle
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