基于绿色纳米涂层的多糖，用掺杂埃及高岭土的 ZnO 纳米粒子进行修饰，用于抗菌涂布纸。
Green nanocoating-based polysaccharides decorated with ZnONPs doped Egyptian kaolinite for antimicrobial coating paper.
机构信息
Cellulose and Paper Department, National Research Centre, Dokki, 12622, Cairo, Egypt.
Paper and Printing Lab., Chemistry Department, Faculty of Science, Helwan University, Helwan, Egypt.
出版信息
Sci Rep. 2023 Jul 15;13(1):11461. doi: 10.1038/s41598-023-38467-1.
Paper coating plays an important role in the paper properties, printability and application. The nanocoating is a multifunction layer that provides the paper with unique features. In this work, nanocoating formulas were prepared using a green method and component. The nanocoating formulas were based on biopolymers nanostarch NSt and nanochitosan NCh (NCS) decorated with Egyptian kaolinite Ka doped with zinc nanoparticles NCS@xka/ZnONPs (x represents different ratios) support for multifunctional uses. The nanocoating formulas were characterized using a physiochemical analysis as well as a topographical study. FTIR, XRD, SEM and TEM techniques were used. Additionally, the antimicrobial activity of the tested samples was assessed against six microorganisms including Gram-negative and Gram-positive bacteria. The prepared nanocoating formulas affirmed excellent antimicrobial activity as a broad-spectrum antimicrobial active agent with excellent activity against all representative microbial communities. The nanocoating with the highest ratio of Ka/ZnONPs (NCS@40 ka/ZnONPs) showed excellent antimicrobial activity with an inhibition percentage of more than 70% versus all microorganisms presented. The paper was coated with the prepared suspensions and characterized concerning optical, mechanical and physical properties. When Ka/ZnONPs were loaded into NCS in a variety of ratios, the characteristics of coated paper were enhanced compared to blank paper. The sample NCS@40 ka/ZnONPs increased tensile strength by 11%, reduced light scattering by 12%, and improved brightness and whiteness by 1%. Paper coated with NCh suspension had 35.32% less roughness and 188.6% less porosity. When coated with the sample NCS@10 ka/ZnONPs, the coated paper's porosity was reduced by 94% and its roughness was reduced by 10.85%. The greatest reduction in water absorptivity was attained by coating with the same sample, with a reduction percentage of 132%.
纸张涂层在纸张性能、印刷适性和应用中起着重要作用。纳米涂层是一种多功能层，可为纸张提供独特的特性。在这项工作中，使用绿色方法和成分制备了纳米涂层配方。纳米涂层配方基于生物聚合物纳米淀粉 NSt 和纳米壳聚糖 NCh（NCS），并用掺杂锌纳米粒子的埃及高岭土 Ka 修饰（NCS@xka/ZnONPs，其中 x 代表不同的比例），以支持多功能用途。使用物理化学分析和形貌研究对纳米涂层配方进行了表征。使用 FTIR、XRD、SEM 和 TEM 技术。此外，还评估了测试样品对包括革兰氏阴性和革兰氏阳性菌在内的六种微生物的抗菌活性。所制备的纳米涂层配方表现出优异的抗菌活性，作为一种广谱抗菌活性试剂，对所有代表性微生物群落均具有优异的活性。具有最高 Ka/ZnONPs 比例的纳米涂层（NCS@40 ka/ZnONPs）表现出优异的抗菌活性，对所有存在的微生物的抑制率超过 70%。用制备的悬浮液对纸张进行涂层，并就光学、机械和物理性能进行了表征。当 Ka/ZnONPs 以各种比例负载到 NCS 中时，与空白纸相比，涂层纸的特性得到了增强。与空白纸相比，负载有 NCS@40 ka/ZnONPs 的样品提高了 11%的拉伸强度，降低了 12%的光散射，提高了 1%的亮度和白度。用 NCh 悬浮液涂层的纸张的粗糙度降低了 35.32%，孔隙率降低了 188.6%。当用样品 NCS@10 ka/ZnONPs 进行涂层时，涂层纸的孔隙率降低了 94%，粗糙度降低了 10.85%。用相同的样品进行涂层时，吸湿性降低的幅度最大，降低了 132%。
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