Lee Seonjin, Bang Doyeon, Park Jong-Oh, Choi Eunpyo
School of Mechanical Engineering, Chonnam National University, Gwangju 61186, Korea.
Korea Institute of Medical Microrobotics, Gwangju 61011, Korea.
Micromachines (Basel). 2022 Jan 31;13(2):243. doi: 10.3390/mi13020243.
The single-layer 4D printing technology that can be controllable in response to external stimuli is a tremendous challenge in many areas, including smart materials, robotics, and drug delivery systems. The single-layer 4D printing technique was enabled by light-focusing, which results in the difference of mechanical properties such as the coefficient of thermal expansion or Young's modulus between focused and unfocused regions. However, 4D printing to the desired shape using single-layered material is challenging. In this paper, we demonstrate the programmed shape morphing by patterning both the static and shape-morphing layers using a single-layer 4D printing system. A shape-morphing layer is formulated by short-time (<3 s) illumination in UV light. Then a static layer is formulated by longer-time (>3 s) illumination in UV light. We expect this technique to lead to the development of micro-scale soft robots.
能够响应外部刺激进行可控的单层4D打印技术在包括智能材料、机器人技术和药物输送系统在内的许多领域都是一项巨大的挑战。单层4D打印技术是通过光聚焦实现的，这导致了聚焦区域和未聚焦区域之间机械性能的差异，如热膨胀系数或杨氏模量。然而，使用单层材料打印出所需形状具有挑战性。在本文中，我们展示了通过使用单层4D打印系统对静态层和形状变形层进行图案化处理来实现编程形状变形。形状变形层是通过在紫外线下短时间（<3秒）照射形成的。然后，通过在紫外线下长时间（>3秒）照射形成静态层。我们期望这项技术能够推动微尺度软机器人的发展。
