Abstract Recently, nanostructured cellulose materials have been taking great attention due to their excellent mechanical properties, nanostructure, and non-toxic nature. According to these amazing properties, nanocellulose has been suggested as an excellent reinforcement material to empower the carbon paper structure. In this study, experimental investigations were conducted to establish a comprehensive understanding of the fundamental characterizations of crystalline nanocellulose (CNC) material such as structure, morphology, crystallinity, dispersion characterizations, and thermal and electrical behavior. Moreover, the grinding effect on the CNC structure and morphology, the advantage of CNC reinforcement in carbon buckypaper (BP) properties and performances were investigated. As a result, structural and morphological studies indicated that the relative amount of crystal domain in the CNC is 66% which contains numerous sphere-shaped crystal nanoparticles composed of small crystallites with an approximate size of 42.33 nm. Therefore, the electrical conductivity of CNC aqueous dispersion was greatly improved with an increase of concentration but the opposite results found for the thermal conductivity. Compared to the non-ground and ground CNC structures, crystallinity and morphology were not able to maintain, dispersibility in aqueous media improved but not the dispersion stability. Moreover, the composite structure of obtained BP was revealed by TEM analysis, filtration, salt rejection and absorption ability of the fabricated buckypaper determined by UV–Vis spectral analysis and electrical conductivity measurement. The obtained nanocomposite CNT/CNC buckypaper exhibited 48% of improved salt rejection and excellent filtration and adsorption ability which can compete with traditional water filtration counterparts. Besides, the natural abundance and biodegradability of nanocellulose are the big-tickets to the low-cost and eco-friendly production of the nanocomposite paper substrate.

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结晶纳米纤维素和纳米纤维素增强碳巴克纸的结构表征

摘要 近年来，纳米结构纤维素材料由于其优异的机械性能、纳米结构和无毒性质而备受关注。根据这些惊人的特性，纳米纤维素被认为是增强复写纸结构的极好增强材料。在这项研究中，进行了实验研究以全面了解结晶纳米纤维素 (CNC) 材料的基本特征，例如结构、形态、结晶度、分散特征以及热和电行为。此外，还研究了研磨对 CNC 结构和形态的影响，以及 CNC 增强在碳巴克纸 (BP) 性能和性能方面的优势。因此，结构和形态研究表明，CNC 中晶体域的相对量为 66%，其中包含许多由大小约为 42.33 nm 的小微晶组成的球形晶体纳米粒子。因此，随着浓度的增加，CNC 水分散体的电导率大大提高，但热导率的结果相反。与未研磨和研磨的 CNC 结构相比，结晶度和形貌无法保持，在水性介质中的分散性提高，但分散稳定性没有提高。此外，通过紫外-可见光谱分析和电导率测量确定的制造巴克纸的透射电镜分析、过滤、脱盐和吸收能力揭示了所获得的 BP 的复合结构。所获得的纳米复合材料 CNT/CNC 巴克纸的脱盐率提高了 48%，并且具有可与传统水过滤对应物竞争的优异过滤和吸附能力。此外，纳米纤维素的天然丰度和可生物降解性是纳米复合纸基材低成本和环保生产的重要因素。