Azizi Susan, Ahmad Mansor Bin, Hussein Mohd Zobir, Ibrahim Nor Azowa, Namvar Farideh
Department of Chemistry, Faculty of Science, University Putra Malaysia, Selangor, Malaysia.
Institute of Tropical Forestry and Forest Products, University Putra Malaysia, Selangor, Malaysia ; Mashhad Branch, Islamic Azad University, Mashhad, Iran.
Int J Nanomedicine. 2014 Apr 23;9:1909-17. doi: 10.2147/IJN.S60274. eCollection 2014.
A series of novel bionanocomposites were cast using different contents of zinc oxide-silver nanoparticles (ZnO-AgNPs) stabilized by cellulose nanocrystals (CNC) as multifunctional nanosized fillers in poly(vinyl alcohol)/chitosan (PVA/Cs) matrices. The morphological structure, mechanical properties, ultraviolet-visible absorption, and antimicrobial properties of the prepared films were investigated as a function of their CNC/ZnO-AgNP content and compared with PVA/chitosan/CNC bionanocomposite films. X-ray diffraction and field emission scanning electron microscopic analyses showed that the CNC/ZnO-AgNPs were homogeneously dispersed in the PVA/Cs matrix and the crystallinity increased with increasing nanosized filler content. Compared with pure PVA/Cs, the tensile strength and modulus in the films increased from 0.055 to 0.205 GPa and from 0.395 to 1.20 GPa, respectively. Ultraviolet and visible light can be efficiently absorbed by incorporating ZnO-AgNPs into a PVA/Cs matrix, suggesting that these bionanocomposite films show good visibility and ultraviolet-shielding effects. The bionanocomposite films had excellent antimicrobial properties, killing both Gram-negative Salmonella choleraesuis and Gram-positive Staphylococcus aureus. The enhanced physical properties achieved by incorporating CNC/ZnO-AgNPs could be beneficial in various applications.
使用不同含量的由纤维素纳米晶体（CNC）稳定的氧化锌-银纳米颗粒（ZnO-AgNPs）作为多功能纳米填料，在聚乙烯醇/壳聚糖（PVA/Cs）基质中浇铸了一系列新型生物纳米复合材料。研究了制备薄膜的形态结构、力学性能、紫外-可见吸收和抗菌性能与其CNC/ZnO-AgNP含量的关系，并与PVA/壳聚糖/CNC生物纳米复合薄膜进行了比较。X射线衍射和场发射扫描电子显微镜分析表明，CNC/ZnO-AgNPs均匀分散在PVA/Cs基质中，且结晶度随纳米填料含量的增加而提高。与纯PVA/Cs相比，薄膜的拉伸强度和模量分别从0.055 GPa提高到0.205 GPa和从0.395 GPa提高到1.20 GPa。通过将ZnO-AgNPs掺入PVA/Cs基质中可以有效吸收紫外光和可见光，这表明这些生物纳米复合薄膜具有良好的透明度和紫外屏蔽效果。生物纳米复合薄膜具有优异的抗菌性能，能杀死革兰氏阴性菌猪霍乱沙门氏菌和革兰氏阳性菌金黄色葡萄球菌。通过掺入CNC/ZnO-AgNPs实现的增强物理性能在各种应用中可能是有益的。
