Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
Department of System Design Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan.
Mater Horiz. 2023 Jun 6;10(6):2237-2244. doi: 10.1039/d3mh00188a.
Imaging and measurement of friction forces are required in a variety of fields. If the friction forces originating from the motions of professionals are quantitatively analyzed, the data can be applied to a motion-copying system by a robot. However, weak friction forces have not been visualized and quantified using conventional sensing materials and devices because of their low sensitivity. Here we present a highly sensitive friction-imaging device based on the cascading responses of stimuli-responsive materials, namely polydiacetylene (PDA) and dry liquid (DL). Weak friction forces disrupt the DL, which is composed of liquid droplets surrounded by solid particles. The outflowing liquid under chemical stress changes the color of PDA. The cascading responses enable colorimetric imaging and measurement of weak friction forces in the range of 0.006-0.080 N. Furthermore, the device visualizes the force distribution of handwriting in calligraphy depending on the individual characteristics of an expert, a practician, and a beginner. A high-sensitivity friction-imaging device can be used to understand various motions.
在各种领域都需要对摩擦力进行成像和测量。如果对专业人员运动产生的摩擦力进行定量分析，这些数据可以通过机器人应用于运动复制系统。然而，由于传统传感材料和设备的灵敏度较低，弱摩擦力尚未得到可视化和量化。在这里，我们提出了一种基于刺激响应材料级联响应的高灵敏度摩擦成像装置，即聚二乙炔（PDA）和干液体（DL）。弱摩擦力会破坏由液体滴周围的固体颗粒组成的 DL。在化学应力下流出的液体改变 PDA 的颜色。级联响应使在 0.006-0.080 N 的范围内进行弱摩擦力的比色成像和测量成为可能。此外，该装置根据专家、从业者和初学者的个人特点，可视化书法中的手写力分布。高灵敏度的摩擦成像装置可用于了解各种运动。
