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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Three-dimensional colloidal crystals in liquid crystalline blue phases
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Three-dimensional colloidal crystals in liquid crystalline blue phases

机译：液晶蓝相中的三维胶体晶体

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摘要

Applications for photonic crystals and metamaterials put stringent requirements on the characteristics of advanced optical materials, demanding tunability, high Q factors, applicability in visible range, and large-scale self-assembly. Exploiting the interplay between structural and optical properties, colloidal lattices embedded in liquid crystals (LC_s) are promising candidates for such materials. Recently, stable two-dimensional colloidal configurations were demonstrated in nematic LC_s. However, the question as to whether stable 3D colloidal structures can exist in an LC had remained unanswered. We show, by means of computer modeling, that colloidal particles can self-assemble into stable, 3D, periodic structures in blue phase LCs. The assembly is based on blue phases providing a 3D template of trapping sites for colloidal particles. The particle configuration is determined by the orientational order of the LC molecules: Specifically, face-centered cubic colloidal crystals form in type-l blue phases, whereas body-centered crystals form in type-ll blue phases. For typical particle diameters (approximately 100 nm) the effective binding energy can reach up to a few 100 k_BT, implying robustness against mechanical stress and temperature fluctuations. Moreover, the colloidal particles substantially increase the thermal stability range of the blue phases, for a factor of two and more. The LC-supported colloidal structure is one or two orders of magnitude stronger bound than, e.g., water-based colloidal crystals.
机译：光子晶体和超材料的应用对高级光学材料的特性，苛刻的可调谐性，高Q因子，在可见光范围内的适用性以及大规模自组装提出了严格要求。利用结构和光学性质之间的相互作用，嵌入液晶（LC_s）中的胶体晶格是此类材料的有希望的候选者。近来，在向列LC_s中证明了稳定的二维胶体构型。但是，关于LC中是否可以存在稳定的3D胶体结构的问题尚未得到解答。我们通过计算机建模显示，胶体颗粒可以在蓝相LC中自组装成稳定的3D周期性结构。该组件基于蓝相，为胶体颗粒提供了捕获位置的3D模板。颗粒的构型由LC分子的取向顺序决定：具体来说，面心立方胶体晶体形成为I型蓝相，而体心晶体则形成为II型蓝相。对于典型的粒径（大约100 nm），有效的结合能可以达到几百k_BT，这意味着可以抵抗机械应力和温度波动。而且，胶体颗粒基本上增加了蓝相的热稳定性范围，为两倍或更多。 LC支撑的胶体结构的结合力比例如水基胶体晶体强一到两个数量级。

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  • 作者

    Miha Ravnik; Gareth P. Alexander; Julia M. Yeomans; Slobodan ZEumer;

  • 作者单位

    Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia,Rudolf Peierls Centre for Theoretical Physics, University of Oxford,Oxford OX1 3NP, United Kingdom;

    Rudolf Peierls Centre for Theoretical Physics, University of Oxford,Oxford OX1 3NP, United Kingdom,Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104;

    Rudolf Peierls Centre for Theoretical Physics, University of Oxford,Oxford OX1 3NP, United Kingdom;

    Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia,Rudolf Peierls Centre for Theoretical Physics, University of Oxford,Oxford OX1 3NP, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    3d self-assembly; colloids; chirality; mesoscopic modeling;

    机译：3d自组装;胶体;手性;介观建模;

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