Magnetoresponsive Discoidal Photonic Crystals Toward Active Color Pigments

Abstract

Photonic microdisks with a multilayered structure are designed from photocurable suspensions by step-by-step photolithography. In each step of photolithography, either a colloidal photonic crystal or a magnetic-particle-laden layer is stacked over the windows of a photomask. Sequential photolithography enables the creation of multilayered photonic microdisks that have brilliant structural colors that can be switched by an external magnetic field.

Bio-inspired self-healing structural color hydrogel

“…colloidal crystal | self-healing | inverse opal | structural color | hydrogel S tructural colors, arising from intrinsic periodic nanostructures and resulting in the interaction of light with these photonic nanostructures, have attracted much interest because of the fascination associated with the display of various brilliant examples (1)(2)(3)(4)(5)(6). The creatures displaying brilliant structural colors are prevalent in nature, and their life, including communication, shielding, and other biological functions, is closely linked with these structural colors (7).…”

Patterned Colloidal Photonic Crystals

“…Another strategy starts from well-assembled PC films.U sing selective UV-exposure,Y ang and coworkers constructed aseries of patterned PC devices for anticounterfeiting measures, [48] displays, [49] and sensors. [50] Selective modification can be used to produce PC patterns simply but efficiently.Aizenberg and co-workers reported an inverse opal (i-opal) PC sensor for the colorimetric determination of solvents based on patterned wetting on the selectively modified PC film ( Figure 3b). [51] I-opal PCs have am uch higher volume percentage of air than opal PCs,s o alarger effective refractive index change can be obtained and much more remarkable colorimetric transformation can be observed if the space is filled by other materials.When this PC sensor was immersed into liquids with various surface tensions,t he liquid would infiltrate into the space with matching surface tension.…”

Metal ion-responsive photonic colloidal crystalline micro-beads with electrochemically tunable photonic diffraction colours

“…If the distance separating the composing particles within a PCC material can be varied by an external influence, the material can produce specific photonic responses upon stimulation. Such a concept of stimulus-responsive photonic colloidal crystalline arrays (SRPCCAs) has spawned a wide variety of promising sensors for temperature [7,8], pH [9,10], magnetic and electric fields [11][12][13], small molecules and biomolecular analytes [14][15][16][17].…”

“…12 Bio TWIN transmission electron microscope (TEM), respectively. Photographs of the PCC micro-beads were taken with an optical microscope (Olympus BX60) equipped with a CCD camera (AxioCam MRc 5).…”