Uniaxially Oriented and Polymerized Chromonic Nanocolumns for Redox-Responsive Smart Glass

Bandwidth-tunable anisotropic spatial light modulators are fabricated with redox-responsive dichroic mesogens. By introducing an ionic group and a polymerizable group into the chromophore, the programmed reactive mesogen (PDI-MA) exhibits a lyotropic chromonic liquid crystal (LCLC) phase. The PDI-MA...

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Published inChemistry of materials Vol. 32; no. 18; pp. 7630 - 7638
Main Authors Kang, Dong-Gue, Rim, Minwoo, Ko, Hyeyoon, Koo, Jahyeon, Lim, Seok-In, Park, Minwook, Yoon, Won-Jin, Choi, Yu-Jin, Jeong, Kwang-Un
Format Journal Article
LanguageEnglish
Published American Chemical Society 22.09.2020
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Summary:Bandwidth-tunable anisotropic spatial light modulators are fabricated with redox-responsive dichroic mesogens. By introducing an ionic group and a polymerizable group into the chromophore, the programmed reactive mesogen (PDI-MA) exhibits a lyotropic chromonic liquid crystal (LCLC) phase. The PDI-MA molecule forms a stable aromatic dianion state so that the absorption wavelengths of the dichroic mesogen can be reversibly tuned by redox reactions. Through a continuous process of coating, molecular self-assembly, and polymerization, redox-responsive and uniaxially oriented LCLC polymer films are fabricated. Because of the high dichroic ratio of PDI-MA, the uniaxially oriented LCLC network is capable of anisotropic light modulation in the visible-light spectrum. Uniaxially oriented LCLC films are applied to flexible multichromic smart windows and optical security filters for anticounterfeiting.
ISSN:0897-4756
1520-5002
DOI:10.1021/acs.chemmater.0c00669