School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, China.
School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai 200240, China
Proc Natl Acad Sci U S A. 2021 Nov 30;118(48). doi: 10.1073/pnas.2114345118.
Camouflage is widespread in nature, engineering, and the military. Dynamic surface wrinkles enable a material the on-demand control of the reflected optical signal and may provide an alternative to achieve adaptive camouflage. Here, we demonstrate a feasible strategy for adaptive visible camouflage based on light-driven dynamic surface wrinkles using a bilayer system comprising an anthracene-containing copolymer (PAN) and pigment-containing poly (dimethylsiloxane) (pigment-PDMS). In this system, the photothermal effect-induced thermal expansion of pigment-PDMS could eliminate the wrinkles. The multiwavelength light-driven dynamic surface wrinkles could tune the scattering of light and the visibility of the PAN film interference color. Consequently, the color captured by the observer could switch between the exposure state that is distinguished from the background and the camouflage state that is similar to the surroundings. The bilayer wrinkling system toward adaptive visible camouflage is simple to configure, easy to operate, versatile, and exhibits in situ dynamic characteristics without any external sensors and extra stimuli.
伪装在自然界、工程学和军事领域都非常普遍。动态表面皱纹使材料能够按需控制反射的光学信号，并可能提供一种实现自适应伪装的替代方法。在这里，我们展示了一种基于光驱动动态表面皱纹的自适应可见伪装的可行策略，该策略使用包含蒽的共聚物 (PAN) 和含颜料的聚二甲基硅氧烷 (颜料-PDMS) 的双层系统。在该系统中，颜料-PDMS 的光热效应诱导的热膨胀可以消除皱纹。多波长光驱动的动态表面皱纹可以调节光的散射和 PAN 膜干涉色的可见度。因此，观察者捕捉到的颜色可以在与背景明显区分的暴露状态和与周围环境相似的伪装状态之间切换。这种双层褶皱系统具有简单的配置、易于操作、多功能和原位动态特性，无需任何外部传感器和额外的刺激。
