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Light-Induced Shape Morphing of Thin Films
摘要： Shape transformation of thin two-dimensional sheets into three-dimensional structures using light is of great interest for remotely-controlled fabrication, surface modulation, and actuation. Over the last few decades, significant efforts have been made to develop materials systems incorporating photochemical or photothermal elements to drive deformation in response to illumination. However, the full extent of the interplay between chemistry, optics, and mechanics in these materials is poorly understood. In this Review, we introduce principles of shape morphing in these systems by considering the underlying physics of photo-induced stresses and how these have been used in recent literature. In addition, we provide a critical overview of the important design characteristics of both photochemical and photothermal system and offer our view on the open opportunities and challenges in this rapidly growing field.
关键词： soft materials,thin film mechanics,Photomechanics,polymers,light responsive materials,shape morphing,actuators
更新于2025-09-19 17:15:36
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Rewritable Optical Patterns in Light Responsive Ultra High Molecular Weight Polyethylene
摘要： Spiropyran is used as a photochromic dye to create colored patterns in highly drawn ultra high molecular weight polyethylene (UHMW PE) films. The dye is incorporated in highly crystalline, drawn UHMW PE tapes and fibers and isomerizes to its merocyanine state upon UV light irradiation, resulting in a color change from transparent to purple. The isomerization from merocyanine to spiropyran to erase the color can be simply induced using heat or a green LED light. The combination of the use of a mask and the reversibility of the isomerization results in colored patterns which can be written, erased and re-written using UV light and heat or green LED light.
关键词： Polymer fibers,ultra high molecular weight polyethylene,photochromism,light responsive materials,rewritable optical materials,spiropyran
更新于2025-09-19 17:15:36