纳米纤维素
化学工程
脱水
材料科学
纤维素
水溶液
集聚经济
纳米颗粒
化学
纳米技术
聚合物
热分解
悬挂(拓扑)
复合材料
有机化学
生物化学
数学
同伦
纯数学
工程类
作者
Deqian Huang,Min Wu,Chao Wang,Shigenori Kuga,Yong Huang
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2020-07-09
卷期号:8 (30): 11389-11395
被引量:49
标识
DOI:10.1021/acssuschemeng.0c03688
摘要
The study on low-cost drying–redispersion process for the storage and transport of nanocellulose has been a great challenge in practical applications. The existence of abundant hydroxyl groups on the nanocellulose surface causes a strong tendency of agglomeration of the nanoparticles in the dry state. In this paper, we propose a new method to solve this problem by controlling the solid content of cellulose suspension to obtain a well-dispersed nanocellulose with reduced fibrillar alignment in the following freeze-drying treatment. The results show that when the solid content in the original suspension varied between 4 and 10 wt %, the morphology of the aerogel transformed from the membranous to fibrillar network with increasing specific surface area and redispersibility, and further dehydration was detrimental. This phenomenon is mainly attributed to the entanglement of cellulose fibrils in the cellulose network, which suppressed the growth of ice crystal during the dry-freezing process. In addition, the interaction between intra-/intermolecular hydrogen bonds is also proved to be responsible for the variation of the cellulose morphologies and the thermal decomposition temperature. This research will provide an effective and convenient way for the transportation and storage of nanocellulose, aiming at its large-scale industrial applications.
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