Hahm Min Jeong, Cho Woongbi, Jeon Jisoo, Kim Hak-Rin, Zhang Teng, Wie Jeong Jae
Department of Organic and Nano Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
Human-Tech Convergence Program, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea.
Sci Adv. 2025 Aug 29;11(35):eadx8301. doi: 10.1126/sciadv.adx8301.
The nonlinear strain response of soft material-based snap-through systems enables amplified and accelerated force output. However, efficiency of snap-through energy release is challenging to improve because of the inherent trade-off between initial curvature and stiffness. Here, spatial programming of stiffness variation in the azobenzene-functionalized liquid-crystalline polymer (Azo-LCP) addresses this limitation and achieves efficient photomechanical jumping. Introduction of stiffness mismatch induced localized curvature, which preserved the initial curvature and simultaneously enhanced photomechanical strain responsivity. By programming for symmetry of stiffness variation, we achieved directional or vertical jumping via strategic placement of the rigid region, with corresponding stress accumulation behaviors corroborated by finite element simulations. Integration of patterned stiffness variation with geometric asymmetry enabled both vertical and horizontal jumping within a single structure, without compromising performance. This dual-mode jumper also demonstrated sequential and consecutive jumps under continuous light exposure.
基于软材料的快速翻转系统的非线性应变响应能够实现放大且加速的力输出。然而，由于初始曲率和刚度之间存在固有的权衡关系，提高快速翻转能量释放的效率具有挑战性。在此，通过对偶氮苯功能化液晶聚合物（Azo-LCP）的刚度变化进行空间编程，解决了这一限制并实现了高效的光机械跳跃。引入刚度失配会引起局部曲率，这既保留了初始曲率，同时又增强了光机械应变响应性。通过对刚度变化的对称性进行编程，我们通过刚性区域的策略性放置实现了定向或垂直跳跃，有限元模拟证实了相应的应力积累行为。将图案化的刚度变化与几何不对称性相结合，能够在单个结构内实现垂直和水平跳跃，而不影响性能。这种双模式跳跃器在连续光照下还展示了连续和相继的跳跃。
