Bals Sara, Batenburg K Joost, Liang Duoduo, Lebedev Oleg, Van Tendeloo Gustaaf, Aerts Alexander, Martens Johan A, Kirschhock Christine E A
EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
J Am Chem Soc. 2009 Apr 8;131(13):4769-73. doi: 10.1021/ja8089125.
Discrete electron tomography is a new approach for three-dimensional reconstruction of nanoscale objects. The technique exploits prior knowledge of the object to be reconstructed, which results in an improvement of the quality of the reconstructions. Through the combination of conventional transmission electron microscopy and discrete electron tomography with a model-based approach, quantitative structure determination becomes possible. In the present work, this approach is used to unravel the building scheme of Zeotile-4, a silica material with two levels of structural order. The layer sequence of slab-shaped building units could be identified. Successive layers were found to be related by a rotation of 120 degrees, resulting in a hexagonal space group. The Zeotile-4 material is a demonstration of the concept of successive structuring of silica at two levels. At the first level, the colloid chemical properties of Silicalite-1 precursors are exploited to create building units with a slablike geometry. At the second level, the slablike units are tiled using a triblock copolymer to serve as a mesoscale structuring agent.
离散电子断层扫描是一种用于纳米级物体三维重建的新方法。该技术利用待重建物体的先验知识，从而提高重建质量。通过将传统透射电子显微镜与离散电子断层扫描以及基于模型的方法相结合，实现了定量结构测定。在本工作中，该方法用于揭示Zeotile-4的构建方案，Zeotile-4是一种具有两级结构有序性的二氧化硅材料。可以识别板状构建单元的层序。发现连续的层通过120度的旋转相关联，形成一个六方空间群。Zeotile-4材料证明了二氧化硅在两个层次上连续结构化的概念。在第一个层次上，利用Silicalite-1前驱体的胶体化学性质来创建具有板状几何形状的构建单元。在第二个层次上，使用三嵌段共聚物作为介观结构剂将板状单元拼接起来。
