A series of organosilane liquid crystals and their application for the preparation of structurally colored organic–inorganic hybrid silica films

Wei, Haohao; Wu, Limin; Sun, Wenjuan; Xu, Tao; Liu, Wei; Li, Baozong; Li, Yang; Yang, Yonggang

doi:10.1080/02678292.2021.1942255

Cited by 1 publication

(1 citation statement)

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“…It was reported previously that the helical pitch change caused by polycondensation could be controlled by tuning the cross-linking degree. [32] When the cross-linking degree is high enough, the helical pitch decreases after polycondensation. However, when the cross-linking degree is low, the helical pitch tends to increase after polycondensation.…”

Section: Resultsmentioning

confidence: 99%

Anti‐counterfeiting Behaviour of Organic‐Inorganic Hybrid Silica Film with a Chiral Smectic C Structure

Sun

Chen

et al. 2022

Chemistry An Asian Journal

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Artificial photonic materials based on chiral liquid‐crystalline nanostructures have attracted increasing interests for their wide applications as sensors, anti‐counterfeit measures, displays and colour filters. Although the structurally coloured films with chiral nematic structures or blue phases have been prepared, the ones fabricated by fixing chiral smectic C (SmC*) phases have been rarely reported. In this work, organic‐inorganic hybrid silica (OIHS) films with a SmC* structure were reported for the first time. An organosilane (CSC) with an enantiotropic SmC* phase was synthesized. The OIHS films with a SmC* structure were fabricated by the polycondensation of CSC under an acidic condition. The colour patterns can be observed in the oblique view, but not be observed in the vertical view, which is mainly due to the light scattering of the nanoparticles on film surface and the selective Bragg reflection of film inside. Therefore, such properties make the OIHS films promising candidates for anti‐counterfeiting applications.

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Section: Resultsmentioning

confidence: 99%