Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, GlasgowG4 0RE, U.K.
EPSRC Future Manufacturing Research Hub for Continuous Manufacturing and Advanced Crystallisation (CMAC), University of Strathclyde, Technology and Innovation Centre, 99 George Street, GlasgowG1 1RD, U.K.
ACS Appl Bio Mater. 2022 Aug 15;5(8):3658-3666. doi: 10.1021/acsabm.2c00023. Epub 2022 May 16.
Origami folding is an easy, cost-effective, and scalable fabrication method for changing a flat material into a complex 3D functional shape. Here, we created semicrystalline silk films doped with iron oxide particles by mold casting and annealing. The flat silk films could be loaded with natural dyes and folded into 3D geometries using origami principles following plasticization. They performed locomotion under a magnetic field, were reusable, and displayed colorimetric stability. The critical parameters for the design of the semi-autonomous silk film, including ease of folding, shape preservation, and locomotion in the presence of a magnetic field, were characterized, and pH detection was achieved by eye and by digital image colorimetry with a response time below 1 min. We demonstrate a practical application─a battery-free origami silk boat─as a colorimetric sensor for waterborne pollutants, which was reusable at least five times. This work introduces silk eco-sensors and merges responsive actuation and origami techniques.
折纸是一种简单、经济且具有扩展性的制造方法，可以将平面材料变成复杂的 3D 功能形状。在这里，我们通过模具铸造和退火的方法，制造了掺杂氧化铁颗粒的半结晶丝膜。这些扁平的丝膜可以负载天然染料，然后通过折纸原理折叠成 3D 几何形状，在塑化后进行运动。它们在磁场下可以进行运动，具有可重复使用性，并显示出比色稳定性。对半自主式丝膜设计的关键参数（包括易于折叠、形状保持和在磁场中运动）进行了表征，并通过肉眼和数字图像比色法检测 pH 值，响应时间低于 1 分钟。我们展示了一个实际应用，即无电池折纸丝船，作为水污染物的比色传感器，它至少可以重复使用五次。这项工作介绍了丝绸生态传感器，并将响应驱动和折纸技术结合在一起。
