Characterization of nanocellulose-graphene electric heating membranes prepared via ultrasonic dispersion
Characterization of nanocellulose-graphene electric heating membranes prepared via ultrasonic dispersion
复制标题
超声分散制备纳米纤维素-石墨烯电热膜的表征
DOI：
10.1007/s10853-019-04006-5
复制
发表时间：
2020
影响因子：
4.5
通讯作者：
Quanping Yuan
中科院分区：
文献类型：
--
作者：
Chuang Shao;Xinpu Li;Shangui Lin;Bing Zhuo;Sheng Yang;Quanping Yuan
纳米纤维纤维(NFC)可以提高石墨烯复合材料的柔韧性和力学性能，但很少有人通过不同的分散条件来研究复合材料的分散性，这主要决定了其关键性能。本文主要研究了超声功率和超声时间对NFC悬浮液、石墨烯悬浮液和复合膜性能的影响。随着超声条件的增加，NFC悬浮液的粒径减小，石墨烯悬浮液的静态稳定性提高。NFC-石墨烯悬浮液由于NFC之间的静电排斥和粘合作用，即使在低超声条件下也表现出良好的静稳定性。经超声波和空化增强剪切力后，石墨烯薄膜能够有效地分离和分散，从而使NFC-石墨烯薄膜的平面均匀性和结构完整性变得更好，这一点通过形貌、化学、热和相结构分析得到了表征和证实。随着超声功率和时间以及力学性能的增加，膜上七点的电导率均匀度呈增加趋势，而由于石墨烯具有良好的导热性能，加热温度均匀度没有明显变化。较高的超声条件有利于电加热性能的稳定。因此，不同条件下的超声处理影响了石墨烯在NFC基质中的掺杂率。本文的研究结果将为复合材料在各个领域的改进提供可行的参考。
Nanofibrillated cellulose (NFC) can enhance the flexibility and mechanical performance of graphene composite, but there are few researches focusing on dispersibility of the composite via different dispersion conditions, which mainly determine their key properties. This presented work concentrated on the influence of ultrasonic power and time on the property of NFC suspension, graphene suspension, and the composite membrane. With the increase in the ultrasonic conditions, particle size of NFC suspension decreased and the static stability of graphene suspension was improved. NFC–graphene suspension exhibited excellent static stability even adopting the low ultrasonic conditions due to the electrostatic repulsive and adhesive effect among NFCs. After enhancing shearing force induced from ultrasonic waves and cavitation, graphene sheets could be effectively detached and dispersed, and then, the planar uniformity and structural integrity of NFC–graphene membrane tended to be better, which was characterized and confirmed by morphology, chemical, and thermal and phase structure analysis. Conductivity uniformity of the seven points on the membrane exhibited an increasing trend with the increase in the ultrasonic power and time, as well as the mechanical performance, while the heating temperature uniformity had no distinct change due to the excellent thermal conductivity of the graphene. The higher ultrasonic condition was conducive to the stability of electric heating performance. Consequently, the ultrasonic treatment with different conditions had impacted the incorporation of graphene into the NFC matrix. This study’s results would be a feasible reference for the improvement of the composite used in various areas.