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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Colloidal quasicrystals with 12-fold and 18-fold diffraction symmetry
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Colloidal quasicrystals with 12-fold and 18-fold diffraction symmetry

机译：具有12倍和18倍衍射对称性的胶体准晶体

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摘要

Micelles are the simplest example of self-assembly found in nature. As many other colloids, they can self-assemble in aqueous solution to form ordered periodic structures. These structures so far all exhibited classical crystallographic symmetries. Here we report that micelles in solution can self-assemble into quasicrystalline phases. We observe phases with 12-fold and 18-fold diffraction symmetry. Colloidal water-based quasicrystals are physically and chemically very simple systems. Macroscopic monodomain samples of centimeter dimension can be easily prepared. Phase transitions between the fcc phase and the two quasicrystalline phases can be easily followed in situ by time-resolved diffraction experiments. The discovery of quasicrystalline colloidal solutions advances the theoretical understanding of quasicrystals considerably, as for these systems the stability of quasicrystalline states has been theoretically predicted for the concentration and temperature range, where they are experimentally observed. Also for the use of quasicrystals in advanced materials this discovery is of particular importance, as it opens the route to quasicrystalline photonic band gap materials via established water-based colloidal self-assembly techniques.
机译：胶束是自然界中最简单的自我组装的例子。与许多其他胶体一样，它们可以在水溶液中自组装以形成有序的周期性结构。到目前为止，这些结构都表现出经典的晶体对称性。在这里我们报道溶液中的胶束可以自组装成准结晶相。我们观察到具有12倍和18倍衍射对称性的相。胶态水准晶体是物理和化学非常简单的系统。厘米尺寸的宏观单畴样品可以轻松制备。 fcc相和两个准晶相之间的相变可通过时间分辨衍射实验轻松地就地追踪。准晶体胶体溶液的发现极大地促进了准晶体的理论理解，因为对于这些系统，已经在浓度和温度范围内从理论上预测了准晶体状态的稳定性，并通过实验观察了它们。对于在高级材料中使用准晶体这一发现也特别重要，因为它通过已建立的水基胶体自组装技术为准晶体光子带隙材料开辟了道路。

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    Steffen Fischer; Alexander Exner; Kathrin Zielske; Jan Perlich; Sofia Deloudi; Walter Steurer; Peter Lindner; Stephan Foerster;

  • 作者单位

    Institut fur Physikalische Chemie, Universitaet Hamburg, D-20146 Hamburg, Germany;

    Institut fur Physikalische Chemie, Universitaet Hamburg, D-20146 Hamburg, Germany;

    Institut fur Physikalische Chemie, Universitaet Hamburg, D-20146 Hamburg, Germany;

    Hamburger Synchrotronstrahlungslabor/Deutsches Elektronen Synchrotron, D-22607 Hamburg, Germany;

    Laboratory of Crystallography, Department of Materials, Eidgenoessiche Technische Hochschule Zuerich,CH-8093 Zuerich, Switzerland;

    Laboratory of Crystallography, Department of Materials, Eidgenoessiche Technische Hochschule Zuerich,CH-8093 Zuerich, Switzerland;

    lnstitut Laue Langevin, F-38042 Grenoble Cedex 9, France;

    Physikalische Chemie I, University of Bayreuth,D-95447 Bayreuth, Germany;

  • 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);
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