Influence of an Imposed Network on One- and Three-Dimensional Photonic Liquid Crystal Structures through the Polymer Template Technique.

IF 2.8 2区 化学 Q3 CHEMISTRY, PHYSICAL
The Journal of Physical Chemistry B Pub Date : 2024-12-26 Epub Date: 2024-12-12 DOI:10.1021/acs.jpcb.4c06196
Rajalaxmi Sahoo, Gayathri R Pisharody, D S Shankar Rao, C V Yelamaggad, S Krishna Prasad
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引用次数: 0

Abstract

We describe the first investigations on the influence of an imposed network on the photonic band gap (PBG) structure of the liquid crystal (LC) phase through the polymer template technique. The technique consists of using a cholesteric (Ch) phase as a base for photopolymerizing a difunctional monomer, which is then removed after polymerization, leaving only the polymer scaffold template. The templated structure obtained is utilized to adjust the PBG structure of the filled LC material, exhibiting both a one-dimensional PBG (Ch phase) and a three-dimensional PBG structure (TGBC* phase with smectic C* blocks). Selective reflection measurements indicate that the imprint polymer network of the template impacts the pitch of the Ch and TGBC* phases. The absorption peaks are visible because of two distinct twisted arrangements, one originating from the template and the other from the refilled chiral substance. In the templated cell, the central wavelength (λmin) of PBG of the refilled sample red-shifts, as well as the width of the PBG gets enhanced compared to that for the sample in the regular (nontemplated) cell. For example, in the TGBC* phase, the λmin value red-shifts by 369 nm, and the width of the PBG enlarges by 50%. Additionally, the lattice spacing arising due to the periodicity of the SmC* helix in 2-dimension in the TGBC* phase gets enhanced. These findings demonstrate the polymer template method's effectiveness in tuning the mesophase's PBG in all three dimensions.

聚合物模板技术对一维和三维光子液晶结构的影响。
本文首次利用聚合物模板技术研究了施加网络对液晶(LC)相光子带隙(PBG)结构的影响。该技术包括使用胆甾相(Ch)作为光聚合双功能单体的基础,然后在聚合后将其去除,只留下聚合物支架模板。利用得到的模板结构对填充LC材料的PBG结构进行调整,得到一维PBG (Ch相)和三维PBG结构(具有近晶C*块的TGBC*相)。选择性反射测量表明,模板的压印聚合物网络影响Ch和TGBC*相的节距。由于两种不同的扭曲排列,吸收峰是可见的,一种来自模板,另一种来自重新填充的手性物质。在模板池中,再填充样品的PBG的中心波长(λmin)发生了红移,PBG的宽度也比在常规(非模板)池中得到了增强。例如,在TGBC*相中,λmin值红移了369 nm, PBG的宽度增大了50%。此外,由于SmC*螺旋在二维中在TGBC*相中的周期性而产生的晶格间距得到了增强。这些发现证明了聚合物模板方法在调整中间相PBG的所有三个维度上的有效性。
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
CiteScore
5.80
自引率
9.10%
发文量
965
审稿时长
1.6 months
期刊介绍: An essential criterion for acceptance of research articles in the journal is that they provide new physical insight. Please refer to the New Physical Insights virtual issue on what constitutes new physical insight. Manuscripts that are essentially reporting data or applications of data are, in general, not suitable for publication in JPC B.
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