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. 2021 Jan 30;24(2):102121. doi: 10.1016/j.isci.2021.102121

Figure 12.

Figure 12

Real-time visual monitoring with the artificial structural colors

(A) Schematic illustration to the shrinkage or expansion of colloidal microcrystals as the electric field is increased or decreased.

(B and C) Practical device for the pixel printing of number 1, 2, and 4 in a 5 × 7 array of electric cells. Reprinted with permission from Chen et al. (2017). Copyright 2017, John Wiley & Sons, Inc.

(D) Schematic illustrations and optical microscopy images for the magnetochromatic effect caused by rotating the chain-like photonic structures in magnetic fields. Reprinted with permission from Ge et al. (2009). Copyright 2009, American Chemical Society.

(E) Schematic illustration of the periodic structure change of photonic crystal hydrogel before and after fully wetted in water.

(F) UV-vis spectra of the films under various humidity conditions.

(G) Photographs of the as-prepared PC hydrogel corresponding to relative humidities of 20%, 50%, 70%, 80%, 90% and 100%, respectively. Reprinted with permission from Tian et al. (2008). Copyright 2008, Royal Society of Chemistry.