Department of Applied Chemistry, College of Engineering , Chubu University , Matsumoto , Kasugai 487-8501 , Japan.
Department of Fibre and Polymer Technology , Royal Institute of Technology , SE-100 44 Stockholm , Sweden.
Biomacromolecules. 2018 Jul 9;19(7):2423-2431. doi: 10.1021/acs.biomac.8b00010. Epub 2018 May 1.
Although research on nanopaper structures from cellulose nanofibrils (CNFs) is well established, the mechanical behavior is not well understood, especially not when CNF is combined with hard nanoparticles. Cationic CNF (Q-CNF) was prepared and successfully decorated by anionic nanodiamond (ND) nanoparticles in hydrocolloidal form. The Q-CNF/ND nanocomposites were filtered from a hydrocolloid and dried. Unlike many other carbon nanocomposites, the Q-CNF/ND nanocomposites were optically transparent. Reinforcement effects from the nanodiamond were remarkable, such as Young's modulus (9.8 → 16.6 GPa) and tensile strength (209.5 → 277.5 MPa) at a content of only 1.9% v/v of ND, and the reinforcement mechanisms are discussed. Strong effects on CNF network deformation mechanisms were revealed by loading-unloading experiments. Scratch hardness also increased strongly with increased addition of ND.
尽管基于纤维素纳米纤维（CNF）的纳米纸结构的研究已经很成熟，但人们对其力学行为，特别是当 CNF 与硬质纳米颗粒结合时的力学行为仍了解甚少。本文成功制备了带正电荷的 CNF（Q-CNF）并对其进行了修饰，使其带有负电荷的纳米金刚石（ND）颗粒以水溶胶的形式存在。将 Q-CNF/ND 纳米复合材料从水溶胶中过滤出来并干燥。与许多其他碳纳米复合材料不同的是，Q-CNF/ND 纳米复合材料是光学透明的。纳米金刚石的增强效果非常显著，例如杨氏模量（从 9.8GPa 增加到 16.6GPa）和拉伸强度（从 209.5MPa 增加到 277.5MPa），仅需添加 1.9%v/v 的 ND，并且讨论了增强机制。通过加载-卸载实验揭示了对 CNF 网络变形机制的强烈影响。划痕硬度也随着 ND 添加量的增加而显著增加。
