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Colorful patterned organic–inorganic hybrid silica films with a cholesteric structure

Abstract

Structural colors have been widely found in nature. Herein, structural colored organic–inorganic hybrid silica (OIHS) films were prepared using a mixture of an organosilane with an enantiotropic nematic phase and a chiral dopant under an acidic condition. After the polycondensation of organosilane, the selective Bragg reflection band of the obtained OIHS film shifted to short wavelength. Due to the E-Z photoisomerization of the chiral dopant, the liquid crystalline mixture showed a photochromic behavior, whose color changed from purple to red with extending UV irradiation time. Then, colorful patterns were prepared using masks.

Graphical abstract

Highlights

  • Photochromic liquid crytalline mixtures were prepared.

  • Structural colored organic–inorganic hybrid silica films were prepared.

  • The colorful patterns can be programmable.

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Funding

This work was supported by the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (20KJA430009) and the Project of Scientific and Technologic Infrastructure of Suzhou (SZS201905).

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Authors

Contributions

TX: data curation, formal analysis, writing—original draft. RY: data curation. WL: formal analysis. HL: formal analysis, writing—review and editing. YL: formal analysis, funding acquisition. YY: supervision, project administration, writing—review and editing.

Corresponding author

Correspondence to Yonggang Yang.

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The authors declare no competing interests.

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Xu, T., Yu, R., Liu, W. et al. Colorful patterned organic–inorganic hybrid silica films with a cholesteric structure. J Sol-Gel Sci Technol 104, 91–96 (2022). https://doi.org/10.1007/s10971-022-05926-6

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  • DOI: https://doi.org/10.1007/s10971-022-05926-6

Keywords

  • Organic–inorganic hybrid silica
  • Helix
  • Cholesteric phase
  • Liquid crystal
  • Structural color