Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA.
Soft Matter. 2018 Mar 28;14(12):2254-2266. doi: 10.1039/c7sm02555f. Epub 2018 Mar 8.
Adhesion plays an important role in the mechanics of nanoscale fibers such as various biological filaments, carbon nanotubes and artificial polymeric nanofibers. In this work we study assemblies of non-crosslinked filaments and characterize their adhesion-driven structural evolution and their final stable structure. The key parameters of the problem are the network density, the fiber length, the bending stiffness of fibers and the strength of adhesion. The system of fibers self-organizes in one of three types of structures: locked networks, in which fibers remain in the as-deposited state, cellular networks, in which fibers form bundles and these organize into a larger scale network, and disintegrated networks, in which the network of bundles becomes disconnected. We determine the parametric space corresponding to each of these structures. Further, we identify a triangular structure of bundles, similar to the Plateau triangle occurring in foams, which stabilizes the network of bundles and study in detail the stabilization mechanism. The analysis provides design guidelines and a physical picture of the stability and structure of random fiber networks with adhesion.
黏附在诸如各种生物纤维、碳纳米管和人工聚合纳米纤维等纳米尺度纤维的力学中起着重要作用。在这项工作中，我们研究了未交联纤维的组装体，并对其黏附驱动的结构演化及其最终稳定结构进行了表征。该问题的关键参数是网络密度、纤维长度、纤维的弯曲刚度和黏附强度。纤维系统自组织成以下三种结构之一：锁定网络，其中纤维保持在沉积状态；细胞网络，其中纤维形成束，这些束组织成更大规模的网络；以及瓦解网络，其中束的网络变得不连续。我们确定了对应于每种结构的参数空间。此外，我们确定了类似于泡沫中出现的 Plateau 三角形的束三角结构，该结构稳定了束的网络，并详细研究了稳定机制。该分析提供了具有黏附作用的随机纤维网络的稳定性和结构的设计指南和物理图像。
