Tough and Variable-Band-Gap Photonic Hydrogel Displaying Programmable Angle-Dependent Colors.

ABSTRACT: One-dimensional photonic crystals or multilayer films produce colors that change depending on viewing and light illumination angles because of the periodic refractive index variation in alternating layers that satisfy Bragg's law. Recently, we have developed multilayered photonic hydrogels of two distinct bulk geometries that possess an alternating structure of a rigid polymeric lamellar bilayer and a ductile polyacrylamide (PAAm) matrix. In this paper, we focus on fabrication of composite gels with variable photonic band gaps by controlling the PAAm layer thickness. We report programmable angle-dependent and angle-independent structural colors produced by composite hydrogels, which is achieved by varying bulk and internal geometries. In the sheet geometry, where the lamellae are aligned p

SUBMITTER: Haque MA 

PROVIDER: S-EPMC6641405 | biostudies-literature | 2018 Jan

REPOSITORIES: biostudies-literature