Photoresponsive carbohydrate-based giant surfactants: automatic vertical alignment of nematic liquid crystal for the remote-controllable optical device

ACS Applied Materials & Interfaces
Dae-Yoon KimKwang-Un Jeong

Abstract

Photoresponsive carbohydrate-based giant surfactants (abbreviated as CELAnD-OH) were specifically designed and synthesized for the automatic vertical alignment (VA) layer of nematic (N) liquid crystal (LC), which can be applied for the fabrication of remote-controllable optical devices. Without the conventional polymer-based LC alignment process, a perfect VA layer was automatically constructed by directly adding the 0.1 wt % CELA1D-OH in the N-LC media. The programmed CELA1D-OH giant surfactants in the N-LC media gradually diffused onto the substrates of LC cell and self-assembled to the expanded monolayer structure, which can provide enough empty spaces for N-LC molecules to crawl into the empty zones for the construction of VA layer. On the other hand, the CELA3D-OH giant surfactants forming the condensed monolayer structure on the substrates exhibited a planar alignment (PA) rather than a VA. Upon tuning the wavelength of light, the N-LC alignments were reversibly switched between VA and PA in the remote-controllable LC optical devices. Based on the experimental results, it was realized that understanding the interactions between N-LC molecules and amphiphilic giant surfactants is critical to design the suitable materials f...Continue Reading

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Citations

Jun 13, 2015·Chemical Communications : Chem Comm·Dae-Yoon KimKwang-Un Jeong
Oct 26, 2016·Chemical Communications : Chem Comm·Dae-Yoon KimKwang-Un Jeong
Jun 13, 2018·Scientific Reports·B SivaranjiniS Umadevi
Dec 5, 2017·Journal of the American Chemical Society·Zhiwei LinStephen Z D Cheng

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