Department of Graphic Design and Engineering Projects, Bilbao Faculty of Engineering , University of the Basque Country (UPV/EHU) , Bilbao 48013 , Spain.
Macromolecular Chemistry Research Group, Deptartment of Physical Chemistry, Faculty of Science and Technology , University of the Basque Country (UPV/EHU) , Leioa 48940 , Spain.
Biomacromolecules. 2018 Jul 9;19(7):2618-2628. doi: 10.1021/acs.biomac.8b00243. Epub 2018 Apr 25.
The dispersion of nanoparticles having different size-, shape-, and composition-dependent properties is an exciting approach to design and synthesize multifunctional materials and devices. This work shows a detailed investigation of the preparation and properties of free-standing nanocomposite films based on cellulose nanocrystals (CNC) loaded with three different types of metal nanoparticles. CNC-based nanocomposites having zinc oxide (ZnO), titanium dioxide (TiO), and silver oxide (AgO) have been obtained through evaporation-induced self-assembly (EISA) in acqueous solution. Morphological and optical characteristics, chemical properties, wettability, and antimicrobial assays of the produced films were conducted. Furthermore, disintegrability in composting condition of CNC based nanocomposites was here investigated for the first time. The morphological observations revealed the formation of a chiral nematic structure with uniformly distributed nanoparticles. The bionanocomposite films based on the metal nanoparticles had effective antimicrobial activity, killing both Escherichia coli RB ( E. coli RB) and Staphylococcus aureus 8325-4 ( S. aureus 8325-4). The simplicity method of film preparation, the large quantity of cellulose in the world, and the free-standing nature of the nanocomposite films offer highly advantageous characteristics that can for the new development of multifunctional materials.
具有不同尺寸、形状和组成依赖性的纳米粒子的分散是设计和合成多功能材料和器件的一种令人兴奋的方法。这项工作详细研究了基于纤维素纳米晶体（CNC）负载三种不同类型金属纳米粒子的独立纳米复合材料薄膜的制备和性能。通过在水溶液中的蒸发诱导自组装（EISA）获得了基于 CNC 的纳米复合材料，其中含有氧化锌（ZnO）、二氧化钛（TiO）和氧化银（AgO）。对所制备的薄膜进行了形态和光学特性、化学性质、润湿性和抗菌试验。此外，首次在这里研究了 CNC 基纳米复合材料在堆肥条件下的可分解性。形态观察显示形成了具有均匀分布纳米粒子的手性向列结构。基于金属纳米粒子的生物纳米复合材料薄膜具有有效的抗菌活性，可杀死大肠杆菌 RB（E. coli RB）和金黄色葡萄球菌 8325-4（S. aureus 8325-4）。薄膜制备方法简单、世界上纤维素含量丰富以及纳米复合材料薄膜的独立性质提供了高度有利的特性，可以为多功能材料的新发展提供条件。
