Photopatterned Anchoring Stabilizing Monodomain Blue Phases

IF 8.3 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Sunqian Liu, Matevž Marinčič, Inge Nys, Miha Ravnik, Kristiaan Neyts
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引用次数: 0

Abstract

Blue phase liquid crystals (BPLCs) are chiral self-assembled three-dimensional (3D) periodic structures which have attracted a lot of attention due to their electro-optical properties, relevant for tunable soft photonic crystals and fast-response displays. However, to realize this application potential, controlling the BPLC alignment at the surfaces is crucial, and one way to obtain the desired alignment is by photoalignment patterning. In this article, monodomain BPLC samples with controlled orientation are achieved by imposing different alignment patterns that have a periodicity that is compatible with the size of the BPLC unit cell, using two-step photoalignment with polarized ultraviolet (UV) light. Experiments are complemented by numerical simulations to design striped surface alignment patterns, which induce specific director orientations on the boundary layer of the confined BPLC. By designing the patterns and matching the periodicity to a specific BP material, we can control the orientation of the blue phase unit cell lattice in the sample, including the azimuthal angle. The orientation is measured by the Kossel patterns and matches the optimal configuration predicted by stability analysis using Landau–de Gennes free energy modeling. The detailed structure and reduced symmetry of the BP near the surface are investigated, and the corresponding (meta)stable structures are demonstrated. Overall, we demonstrate that two-step photoalignment patterning is a reliable, relatively simple, and reconfigurable method to achieve a high-quality monodomain BP with controlled and tunable crystalline orientation.

Abstract Image

光模式锚定稳定单域蓝相
蓝相液晶(bplc)是一种手性自组装三维(3D)周期结构,由于其电光特性而受到广泛关注,与可调谐软光子晶体和快速响应显示有关。然而,为了实现这一应用潜力,控制BPLC在表面的对准是至关重要的,而获得所需对准的一种方法是通过光对准图图化。在这篇文章中,单畴BPLC样品控制的方向是通过施加不同的排列模式,具有周期性,是兼容的BPLC单元格的大小,使用偏振紫外线(UV)光两步光校准。实验与数值模拟相结合,设计出条纹表面排列模式,从而在受限BPLC边界层上诱导出特定的定向方向。通过设计图案并将周期性与特定的BP材料相匹配,我们可以控制样品中蓝色相单位晶格的方向,包括方位角。取向是通过科塞尔模式测量的,并与使用朗多-德-热纳自由能模型进行稳定性分析预测的最佳构型相匹配。研究了近地表BP的详细结构和减少的对称性,并证明了相应的(元)稳定结构。总的来说,我们证明了两步光对准图图化是一种可靠的、相对简单的、可重构的方法,可以实现具有可控和可调谐晶体取向的高质量单域BP。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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