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Abstract：
Developing green and simple methods for the preparation of cellulose nanofibrils (CNFs) is of great significance. Herein, a green deep eutectic solvent (DES) system based on choline chloride (ChCl) and citric acid (CA) is employed to pretreat cellulose fibers for the preparation of CNFs. The effect of the pretreatment temperature on the chemo-physical properties of the CNFs is comprehensively investigated. A high CNFs yield of up to 84.19% can be achieved under optimized conditions. The optimal CNFs show a narrow diameter distribution and length up to several microns, high crystallinity and thermal stability, as well as excellent dispersibility in water. Furthermore, semi-transparent and flexible cellulose nanopaper (CNP) was fabricated through a facile vacuum filtration process. The optimal CNP shows high tensile strength (175.15 MPa) and toughness (7.51 MJ/m3). Therefore, this work provides a sustainable and facile approach to fabricate CNFs and CNP, which can be potentially used for various high-tech applications.
摘要：
开发绿色和简单的制备纤维素纳米原纤维（CNFs）的方法具有重要意义。在这里，使用基于氯化胆碱（ChCl）和柠檬酸（CA）的绿色深共熔溶剂（DES）系统来预处理纤维素纤维以制备CNF。全面研究了预处理温度对CNFs化学物理性质的影响。在优化条件下可以实现高达84.19%的高CNF产率。最佳的CNF显示出窄的直径分布和长度达几微米，高结晶度和热稳定性，以及在水中优异的分散性。此外，半透明和柔性纤维素纳米纸（CNP）是通过一个简单的真空过滤工艺制造的。最佳的CNP显示出高的拉伸强度(175.15MPa)和韧性(7.51MJ/m3)。因此,这项工作提供了一种可持续和容易的方法来制造CNF和CNP，可用于各种高科技应用。
