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. 2020 Mar 9;12(3):625. doi: 10.3390/polym12030625

Figure 1.

Figure 1

(A) Photograph of a crystal opal gemstone from South Australia; (B) illustration of the diffraction from the (111) planes of the opal that follows Bragg’s law; (C) opaline non-close-packed (NCP) colloidal photonic crystals (CPCs) self-assembled from polystyrene (PS) colloids that were stored in jars; schematic illustration of (D) hexagonal-close-packed (HCP), (E) face-centered-cubic (FCC), and (F) body-centered-cubic (BCC) structures; SEM images of (G) HCP [24] (scale bar is 1 μm), (H) slightly NCP FCC, and (I) BCC structures [25].