According to the report of the Physicist Organization Network on May 11 (Beijing time), mechanical engineers at the University of Colorado at Boulder have recently developed a technique for folding objects with light of a specific wavelength. This kind of “photo-origami†is expected to Bring a new three-dimensional structure manufacturing technology. The related papers were published in the recently published Applied Physics Letters. In the experiment, the researchers demonstrated a new technology for this light-folding object using a planar two-dimensional polymer containing a photosensitizer. First, the polymer is stretched to produce a mechanical tension, and then irradiated with light to an area of ​​it, such as a broken line, which causes the photosensitizer to decompose into free radicals. The free radicals are highly reactive and cause reorganization of the polymer chain. To relieve tension in the area. In order to achieve mechanical equilibrium in the material itself, redistribution of the tension leads to deformation and the material is folded along the irradiation line. "This is a non-contact method that allows the polymer film to be accurately bent and folded through three-dimensional programming and computer simulation manipulation," explained Martin Dunn, a professor of mechanical engineering who led the study. The whole process is a folding process, and each time the folding is repeated, the irradiation and deformation steps are repeated. These steps are performed in a specific order and a complex shape can be created. This "photo paper origami" uses only light and mechanical tension to fold the material, and is expected to be a simpler, automatic, continuous folding process. According to researchers, there are many methods that can be used to fold materials according to a programming procedure. However, most methods require some operating devices to be applied to the material to apply operating pressure from the outside. This new technology that allows the material to fold itself without additional factors can greatly simplify the process for wider application. "In theory, this technology can produce complex structures composed of various bends and folds in any order in any direction." Dunn said, "We can design a lot of structures through computer simulation." The application of "photocopying" far exceeds the initial field of origami as a creative art. Researchers say that technical origami is critical when an item needs to be stored, transported, and then used again. Such as space solar batteries, automatic airbags, tissue engineering, packing boxes, and photovoltaic cells that maximize the capture of light energy. In addition to macroscopic fields, it can also be used in microscopic and nanoscopic fields. For example, folding a molecule to change its shape can change the molecular properties. "We also plan to make smaller, more precise, mass-produced structures that give them multiple physical capabilities," said Dunn. (Reporter Chang Lijun) tape measures for sewing,best tape measures,tape measures for sale,tape measures at screwfix Shangqiu Zhengtu Hardware Technology Co,.Ltd , https://www.ztlighter.com