Akamatsu Norihisa, Tashiro Wataru, Saito Keisuke, Mamiya Jun-ichi, Kinoshita Motoi, Ikeda Tomiki, Takeya Jun, Fujikawa Shigenori, Priimagi Arri, Shishido Atsushi
Chemical Resources Laboratory, Tokyo Institute of Technology, R1-12, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
1] Chemical Resources Laboratory, Tokyo Institute of Technology, R1-12, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan [2].
Sci Rep. 2014 Jun 20;4:5377. doi: 10.1038/srep05377.
Mechanical properties of flexible films, for example surface strain of largely bending films, are key to design of stretchable electronic devices, wearable biointegrated devices, and soft microactuators/robots. However, existing methods are mainly based on strain-gauge measurements that require miniaturized array sensors, lead wires, and complicated calibrations. Here we introduce a facile method, based on surface-labelled gratings, for two-dimensional evaluation of surface strains in largely bending films. With this technique, we demonstrate that soft-matter mechanics can be distinct from the mechanics of hard materials. In particular, liquid-crystalline elastomers may undergo unconventional bending in three dimensions, in which both the inner and outer surfaces of the bending film are compressed. We also show that this method can be applied to amorphous elastomeric films, which highlights the general importance of this new mechanical evaluation tool in designing soft-matter-based electronic/photonic as well as biointegrated materials.
柔性薄膜的机械性能，例如大幅弯曲薄膜的表面应变，是可拉伸电子器件、可穿戴生物集成器件以及软微致动器/机器人设计的关键。然而，现有方法主要基于应变计测量，这需要小型化阵列传感器、引线以及复杂的校准。在此，我们介绍一种基于表面标记光栅的简便方法，用于二维评估大幅弯曲薄膜中的表面应变。通过这项技术，我们证明软物质力学可能与硬材料力学不同。特别是，液晶弹性体可能会在三维空间中经历非常规弯曲，其中弯曲薄膜的内表面和外表面都会受到压缩。我们还表明，这种方法可以应用于非晶态弹性体薄膜，这突出了这种新型机械评估工具在设计基于软物质的电子/光子以及生物集成材料方面的普遍重要性。
