Michels-Brito Paulo H, Dudko Volodymyr, Wagner Daniel, Markus Paul, Papastavrou Georg, Michels Leander, Breu Josef, Fossum Jon Otto
Department of Physics, Norwegian University of Science and Technology (NTNU), Trondheim, Norway.
Department of Inorganic Chemistry I and Bavarian Polymer Institute, University of Bayreuth, Bayreuth, Germany.
Sci Adv. 2022 Jan 28;8(4):eabl8147. doi: 10.1126/sciadv.abl8147. Epub 2022 Jan 26.
Structural colors originate by constructive interference following reflection and scattering of light from nanostructures with periodicity comparable to visible light wavelengths. Bright and noniridescent structural colorations are highly desirable. Here, we demonstrate that bright noniridescence structural coloration can be easily and rapidly achieved from suspended two-dimensional nanosheets of a clay mineral. We show that brightness is enormously improved by using double clay nanosheets, thus optimizing the clay refractive index that otherwise hampers structural coloration from such systems. Intralayer distances, and thus the structural colors, can be precisely and reproducibly controlled by clay concentration and ionic strength independently, and noniridescence is readily and effortlessly obtained in this system. Embedding such clay-designed nanosheets in recyclable solid matrices could provide tunable vivid coloration and mechanical strength and stability at the same time, thus opening a previously unknown venue for sustainable structural coloration.
结构色源于光从具有与可见光波长相当的周期性的纳米结构反射和散射后的相长干涉。明亮且无虹彩的结构色是非常理想的。在此，我们证明了可以从粘土矿物的悬浮二维纳米片轻松快速地实现明亮的无虹彩结构色。我们表明，通过使用双层粘土纳米片可极大地提高亮度，从而优化了粘土的折射率，否则该折射率会妨碍此类系统产生结构色。层内间距以及由此产生的结构色可分别通过粘土浓度和离子强度精确且可重复地控制，并且在该系统中很容易就能获得无虹彩效果。将这种经过设计的粘土纳米片嵌入可回收的固体基质中，可同时提供可调节的鲜艳颜色以及机械强度和稳定性，从而为可持续结构色开辟了一个前所未有的途径。
