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Free-standing mesoporous silica films with tunable chiral nematic structures

机译：具有可调手性向列结构的自立介孔二氧化硅薄膜

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摘要

Chirality at the molecular level is found in diverse biological structures, such as polysaccharides, proteins and DNA, and is responsible for many of their unique properties. Introducing chirality into porous inorganic solids may produce new types of materials that could be useful for chiral separation, stereospecific catalysis, chiral recognition (sensing) and photonic materials. Template synthesis of inorganic solids using the self-assembly of lyotropic liquid crystals offers access to materials with well-defined porous structures, but only recently has chirality been introduced into hexagonal mesostructures through the use of a chiral surfactant. Efforts to impart chirality at a larger length scale using self-assembly are almost unknown. Here we describe the development of a photonic mesoporous inorganic solid that is a cast of a chiral nematic liquid crystal formed from nanocrystalline cellulose. These materials may be obtained as free-standing films with high surface area. The peak reflected wavelength of the films can be varied across the entire visible spectrum and into the near-infrared through simple changes in the synthetic conditions. To the best of our knowledge these are the first materials to combine mesoporosity with long-range chiral ordering that produces photonic properties. Our findings could lead to the development of new materials for applications in, for example, tuneable reflective filters and sensors. In addition, this type of material could be used as a hard template to generate other new materials with chiral nematic structures.
机译：在分子水平上的手性存在于多种生物结构中，例如多糖，蛋白质和DNA，并对其许多独特特性负责。将手性引入多孔无机固体中可能会产生新型材料，这些材料可用于手性分离，立体定向催化，手性识别（传感）和光子材料。使用溶致液晶的自组装进行无机固体的模板合成，可提供具有明确定义的多孔结构的材料，但直到最近才通过使用手性表面活性剂将手性引入六角形介孔结构中。使用自组装在更大的长度尺度上赋予手性的努力几乎是未知的。在这里，我们描述了光子介孔无机固体的发展，该固体是由纳米晶纤维素形成的手性向列液晶的铸件。这些材料可以作为具有高表面积的自支撑膜获得。薄膜的峰值反射波长可以在整个可见光谱范围内变化，并且可以通过合成条件的简单变化而变化为近红外光。据我们所知，这是第一种将介孔性与产生光子特性的远距离手性有序结合的材料。我们的发现可能会导致开发可调谐反射滤波器和传感器等应用中的新材料。另外，这种材料可用作硬模板，以生成具有手性向列结构的其他新材料。

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  • 来源
    《Nature》 |2010年第7322期|p.422-425|共4页
  • 作者

    Kevin E. Shopsowitz; Hao Qi; Wadood Y. Hamad; Mark J. MacLachlan;

  • 作者单位

    Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada;

    rnDepartment of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada;

    rnFPInnovations, 3800 Wesbrook Mall, Vancouver, British Columbia, V6S 2L9, Canada;

    rnDepartment of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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