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首页> 外文期刊>Advanced Functional Materials >Smectic Liquid Crystalline Titanium Dioxide Nanorods: Reducing Attractions by Optimizing Ligand Density
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Smectic Liquid Crystalline Titanium Dioxide Nanorods: Reducing Attractions by Optimizing Ligand Density

机译：近晶液晶二氧化钛纳米棒：通过优化配体密度来降低景点

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摘要

Crystalline titanium dioxide (TiO2) semiconductor nanorods (NRs) feature several optical properties, such as birefringence combined with high refractive indexes and a wide bandgap precluding optical absorption in visible-light spectrum, making them attractive for many applications such as optoelectronics. Dispersing these NRs in suitable solvents creates inorganic liquid crystals (LCs) offering enhanced collective and orientation-dependent properties, which can additionally be utilized to manipulate optical behavior. Herein, a synthetic procedure from literature is scaled up and coupled with an important post-synthesis-treatment step such that self-assembled NRs dried onto a liquid interface and in bulk can be investigated. Comprehensive characterizations confirm the vital role of surface ligand density of the NRs in reducing the effects of attractions between them and thus increasing the range of volume fractions in which these dispersions can be exploited. Various symmetries (hexagonal or tetragonal) can be achieved in the smectic layers of NRs by tuning the aspect ratios of the NRs from 4.8 to 8.5. Experiments show that external fields such as shear flow or electric fields can easily either induce a reversible nematic order in isotropic dispersions or order existing LC phases over much longer regions, opening many opportunities to manipulate light for optical applications.
机译：结晶二氧化钛（TiO 2）半导体纳米棒（NRS）具有几种光学性质，例如双折射与高折射率合并，并且在可见光光谱中排除光学吸收的宽带隙，使它们对诸如光电子的许多应用具有吸引力。将这些NRS分散在合适的溶剂中产生无机液晶（LC），其提供增强的集体和取向依赖性属性，其可另外用于操纵光学行为。这里，来自文献的合成方法被缩放并与重要的合成后处理步骤相结合，使得可以研究将自组装的NR干燥到液体界面和块状上。综合表征证实了NRS在降低它们之间的吸引力的影响中的表面配体密度的重要作用，从而增加了可以利用这些分散体的体积分数的范围。通过将NRS的纵横比从4.8至8.5调节偏心比，可以在NRS的椎间目层中实现各种对称性（六边形或四方）。实验表明，诸如剪切流或电场之类的外部领域可以容易地在各向同性分散体中诱导可逆的向志性顺序或在更长的区域上排列现有的LC阶段，打开许多机会来操纵光学应用的光。

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  • 来源
    《Advanced Functional Materials》 |2020年第52期|2005491.1-2005491.11|共11页
  • 作者

    Hosseini Seyed Naveed; Grau-Carbonell Albert; Nikolaenkova Anna G.; Xie Xiaobin; Chen Xiaodan; Imhof Arnout; van Blaaderen Alfons; Baesjou Patrick J.;

  • 作者单位

    Univ Utrecht Soft Condensed Matter Debye Inst Nanomat Sci Princetonpl 5 NL-3584 CC Utrecht Netherlands;

    Univ Utrecht Soft Condensed Matter Debye Inst Nanomat Sci Princetonpl 5 NL-3584 CC Utrecht Netherlands;

    Univ Utrecht Soft Condensed Matter Debye Inst Nanomat Sci Princetonpl 5 NL-3584 CC Utrecht Netherlands;

    Univ Utrecht Soft Condensed Matter Debye Inst Nanomat Sci Princetonpl 5 NL-3584 CC Utrecht Netherlands;

    Univ Utrecht Soft Condensed Matter Debye Inst Nanomat Sci Princetonpl 5 NL-3584 CC Utrecht Netherlands;

    Univ Utrecht Soft Condensed Matter Debye Inst Nanomat Sci Princetonpl 5 NL-3584 CC Utrecht Netherlands;

    Univ Utrecht Soft Condensed Matter Debye Inst Nanomat Sci Princetonpl 5 NL-3584 CC Utrecht Netherlands;

    Univ Utrecht Soft Condensed Matter Debye Inst Nanomat Sci Princetonpl 5 NL-3584 CC Utrecht Netherlands;

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  • 正文语种 eng
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  • 关键词

    brookite titanium dioxide; liquid crystals; nanorods; self-assembly; surface ligands;

    机译：Brookite二氧化钛;液晶;纳米棒;自组装;表面配体;

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