University of Sfax, LMSE-Faculty of Science-BP, 802-3018 Sfax, Tunisia.
Univ. Grenoble Alpes, CNRS, Grenoble INP, LRP, F-38000 Grenoble, France.
Mater Sci Eng C Mater Biol Appl. 2019 Dec;105:110044. doi: 10.1016/j.msec.2019.110044. Epub 2019 Jul 31.
Cellulose (Cel) nanofibrils (CNFs) produced by periodate oxidation of native cellulose fibers were functionalized with silver (Ag) nanoparticles (NPs) using Tollens' reaction. The morphology and chemical composition of the resulting Cel-Aghybrid nanofibrils were characterized using transmission electron microscopy (TEM), X-ray diffraction (XRD), as well as Fourier-transform infrared (FTIR) and UV-Vis spectroscopies. To check whether the hybridization with Ag affected the reinforcing potential of the CNFs, nanocomposite films based on an acrylic matrix filled with the as-prepared Cel-Ag nanofibrils at different contents were processed by film casting. Their mechanical properties were investigated by dynamic thermomechanical analysis (DMTA). The hybrid Cel-Ag nanofibrils exhibited good bactericidal properties against Gram and Gram bacteria. Interestingly, the presence of Ag NPs did not seem to affect the reinforcing potential of the nanocellulose, and the amount of Ag leached out from films was below the permissible limit of 12 ppb. Nanocomposites based on this hybrid Cel-Ag nanofiller thus have a great potential in the field of active packaging films, coating and adhesives with enhanced antibacterial activity.
用过氧化氢对天然纤维素纤维进行 periodate 氧化制备的纤维素（Cel）纳米原纤维（CNFs），使用 Tollens 反应将其功能化，接上银（Ag）纳米颗粒（NPs）。采用透射电子显微镜（TEM）、X 射线衍射（XRD）、傅里叶变换红外（FTIR）和紫外-可见光谱对所得 Cel-Aghybrid 纳米原纤维的形貌和化学组成进行了表征。为了检查与 Ag 的杂交是否影响 CNFs 的增强潜力，通过浇铸法制备了以丙烯酸基质为基础、填充不同含量的 Cel-Ag 纳米原纤维的纳米复合材料薄膜，并通过动态热机械分析（DMTA）研究了它们的机械性能。杂交 Cel-Ag 纳米原纤维对革兰氏阳性和革兰氏阴性细菌均具有良好的杀菌性能。有趣的是，Ag NPs 的存在似乎并不影响纳米纤维素的增强潜力，而且从薄膜中浸出的 Ag 量低于 12ppb 的允许限值。因此，基于这种杂交 Cel-Ag 纳米纤维的纳米复合材料在具有增强抗菌活性的活性包装薄膜、涂料和胶黏剂领域具有很大的潜力。
