Guo Tianyu, Wan Zhangmin, Yu Yan, Chen Hui, Wang Zhifeng, Li Dagang, Song Junlong, Rojas Orlando J, Jin Yongcan
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, and Jiangsu Provincial Key Lab of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, P. R. China.
Bioproducts Institute, Department of Chemical and Biological Engineering, Department of Chemistry and Department of Wood Science, The University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada.
ACS Appl Mater Interfaces. 2022 Apr 13;14(14):16809-16819. doi: 10.1021/acsami.1c25227. Epub 2022 Mar 30.
We investigate the mechanism of binding of dopamine-conjugated carboxymethyl cellulose (DA-CMC) with carbon nanotubes (CNTs) and the strain-induced interfacial strengthening that takes place upon wet drawing and stretching filaments produced by wet-spinning. The filaments are known for their tensile strength (as high as 972 MPa and Young modulus of 84 GPa) and electrical conductivity (241 S cm). The role of axial orientation in the development of interfacial interactions and structural changes, enabling shear load bearing, is studied by molecular dynamics simulation, which further reveals the elasto-plasticity of the system. We propose that the reversible torsion of vicinal molecules and DA-CMC wrapping around CNTs are the main contributions to the interfacial strengthening of the filaments. Such effects play important roles in impacting the properties of filaments, including those related to electrothermal heating and sensing. Our findings contribute to a better understanding of high aspect nanoparticle assembly and alignment to achieve high-performance filaments.
我们研究了多巴胺共轭羧甲基纤维素（DA-CMC）与碳纳米管（CNT）的结合机制，以及湿法拉伸和湿纺生产的拉伸长丝时发生的应变诱导界面强化。这些长丝以其拉伸强度（高达972MPa，杨氏模量为84GPa）和电导率（241S/cm）而闻名。通过分子动力学模拟研究了轴向取向在界面相互作用发展和结构变化中的作用，这种变化能够承受剪切载荷，这进一步揭示了该系统的弹塑性。我们认为，邻近分子的可逆扭转和DA-CMC缠绕在碳纳米管上是长丝界面强化的主要原因。这些效应在影响长丝性能方面起着重要作用，包括与电热加热和传感相关的性能。我们的研究结果有助于更好地理解高纵横比纳米颗粒的组装和排列，以实现高性能长丝。
