Nacre-inspired layered composite gels with broad tunable mechanical strength and structural color for stress visualization

Abstract

The brick-and-mortar architecture of nacre shells brings radiant structural colors, high toughness and strength, inspiring numerous designs for structural and optical materials. However, constructing structural color is not always easy,...

A magnetically responsive photonic crystal of graphene oxide nanosheets

“…16,17 Recently, photonic crystals composed of colloidal nanosheets have attracted much attention as a new class of dynamic photonic crystals. 18–41 To manipulate their photonic properties, it is important to control the orientation of nanosheets by applying external stimuli, such as shear forces, 25,26,38 electric fields, 27,28,38–40 and magnetic fields. 29–34 Among these stimuli, a strong magnetic field serves as a promising tool because it can be applied (1) in any direction, (2) with no limitations on size and shape as long as a sample can be placed within a magnetic bore, and (3) in a non-contact manner, avoiding damage to a sample.…”

Photonic Crystals Based on ZIF-8 Nanoparticles with Embedded Carbon Dots for Optical Information Encryption

“…Photonic crystals (PCs), composed of periodic micro- or nanostructures, have received widespread attention due to their remarkable physical properties and structural color and have numerous applications in fields such as display, printing, , sensing, − and dye, especially in the field of information encryption and anti-counterfeiting. − The current anti-counterfeiting applications associated with PCs can be roughly divided into two methods: The first one is regarded as responsive PCs with the single-mode only containing one or multiphotonic band gaps (PBGs) and exhibit vivid structural colors with invisible or switchable patterns, which are sensitive to the environment, including pH, temperature, solvent, , angle-changing, mechanical force, , and so on. The other encryption method using PCs involves integrating fluorescence and PBG into a dual-mode system.…”

Magnetic field-responsive graphene oxide photonic liquids

“…4,24–26 In particular, these fish can abruptly change the tilt angles (like a venetian blind) or interlayer distances of the iridophores to create a fluid and flamboyant display of color in response to stimuli in a rapidly changing environment. 4,24–26 In a similar way, suspensions of nanosheets such as H 3 Sb 3 P 2 O 14 , 27–29 phosphate, 30–32 titanate, 33 niobate, 34 perovskites 35 and fluorohectorite clay 36–38 can also display fluidic photonic properties, as these nanoparticles can form lyotropic liquid crystalline lamellar phases in which the space between nanosheets is filled with solvent molecules. The spacings ( i.e.…”