Unprecedented sign change of Poisson’s ratio not only paves the way for diverse applications, but it provides a sense of deep understanding of ‘hidden’ mechanics, yet to be discovered. Stochastically distributed multi-walled carbon nanotubes in the form of buckypaper can possess negative Poisson’s ratio, but the underlying design principles are still unclear. Herein, we explored analytical approaches, namely, energy minimization, structural modeling, and force-balance as a means to target negative Poisson’s ratio in the buckypaper. Though ‘zero’ Poisson’s ratio is still achievable, the controlling parameters could not be identified. Guided by a ‘keyed-brick’ structure, a simple geometrical model is then constructed to account for sliding effects in carbon nanotubes for contemporary understanding of auxetic behavior (negative Poisson’s ratio). The alignment of carbon nanotubes plays a prominent role in augmenting the magnitude of negative Poisson’s ratio.

泊松比的前所未有的符号变化不仅为各种应用铺平了道路，而且还提供了对“隐藏”机制的深入了解，还有待发现。buckypaper形式的随机分布的多壁碳纳米管可以具有负的泊松比，但是基本的设计原理仍不清楚。在本文中，我们探索了分析方法，即最小化能量，结构建模和力平衡，以此作为针对巴基纸中负泊松比的一种方法。尽管仍然可以实现“零”泊松比，但是无法识别控制参数。然后，以“楔形砖”结构为指导，构建一个简单的几何模型，以解释碳纳米管中的滑动效应，以当代理解拉力行为（负泊松比）。