Uetani Kojiro, Uto Takuya
Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science 6-3-1 Niijuku, Katsushika-ku Tokyo 125-8585 Japan
Graduate School of Engineering, University of Miyazaki Nishi 1-1 Gakuen Kibanadai Miyazaki 889-2192 Japan
RSC Adv. 2023 May 31;13(24):16387-16395. doi: 10.1039/d3ra01784b. eCollection 2023 May 30.
Analysis of the attractive interaction between intrinsically twisted cellulose nanofibers (CNFs) is essential to control the physical properties of the higher-order structures of CNFs, such as paper and spun fiber. In this study, a finite element model reflecting the typical morphology of a twisted CNF was used to analyze the attractive interaction forces between multiple approaching CNF models. For two parallel CNF models, when one of the CNF models was rotated 90° around the long-axis direction, the twisting periods meshed, giving the maximum attraction force. Conversely, when the two CNF models were approaching diagonally, the CNF models were closest at an angle of -3.2° (, in left-handed chirality) to give the most stable structure owing to the right-handed twist of the CNF models themselves. Furthermore, the two nematic layers were closest when one nematic layer was approached at an angle of -2° (, in left-handed accumulation chirality), resulting in the greatest attraction. The results characterize the unique distribution of the attractive interaction forces between twisted CNF models, and they underscore the importance of chiral management in CNF aggregates, especially intermeshing of twists.
分析本征扭曲纤维素纳米纤维（CNFs）之间的吸引相互作用对于控制CNFs高阶结构（如纸张和纺丝纤维）的物理性能至关重要。在本研究中，使用反映扭曲CNF典型形态的有限元模型来分析多个接近的CNF模型之间的吸引相互作用力。对于两个平行的CNF模型，当其中一个CNF模型绕长轴方向旋转90°时，扭曲周期相互啮合，产生最大吸引力。相反，当两个CNF模型对角接近时，由于CNF模型本身的右旋扭曲，CNF模型在-3.2°（左手螺旋）角度时最接近，从而形成最稳定的结构。此外，当一个向列层以-2°（左手堆积螺旋）角度接近时，两个向列层最接近，产生最大吸引力。这些结果表征了扭曲CNF模型之间吸引相互作用力的独特分布，并强调了在CNF聚集体中进行手性管理的重要性，特别是扭曲的相互啮合。
