Spontaneous Formation and Characterization of Silica Mesoporous Crystal Spheres with Reverse Multiply Twinned Polyhedral Hollows
Spontaneous Formation and Characterization of Silica Mesoporous Crystal Spheres with Reverse Multiply Twinned Polyhedral Hollows
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DOI：
10.1021/ja110443a
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发表时间：
2011-04-27
影响因子：
15
通讯作者：
Che, Shunai
中科院分区：
文献类型：
--
作者：
Han, Lu;Long, Ping;Che, Shunai
晶体是具有平移对称性的物体。新材料的基础研究和生产需要制备具有特定形貌和明确定义的晶体缺陷的晶体。在这项工作中，我们发现了具有多面体空洞(二十面体，如病毒衣壳蛋白、十面体、Wulff多面体等)的新型二氧化硅介孔晶球。由反向倍增孪生双连续双金刚石介观结构形成。在非离子表面活性剂存在下，两亲性羧酸分子通过自组装形成具有低曲率片层结构的囊泡，然后经历结构转变过程，在保持中空形状的同时获得反向多孪晶介孔壳层。这些多面体空心晶体相对于入射声信号表现出增强的背向散射信号的对比度，因此可以作为一种潜在的造影剂用于医学超声中载药在介孔中。
A crystal is an object with translational symmetry. Basic research into and production of new materials necessitates the preparation of crystals of a particular morphology and with well-defined crystal defects. In this work, we found novel silica mesoporous crystal spheres with polyhedral hollows (icosahedral, such as those observed for proteins of virus capsids, decahedral, Wulff polyhedral, etc.) formed by the reverse multiply twinned bicontinuous double diamond mesostructure. Vesicles with a low-curvature lamellar structure were first formed by the self-assembly of amphiphilic carboxylic acid molecules in the presence of a nonionic surfactant and then underwent a structural transformation process that gave a reverse multiply twinned mesoporous shell while maintaining the hollow shape. These polyhedral hollow crystals showed an enhanced contrast of backscattering signatures relative to the incident acoustic signals and thus could be used as a potential contrast agent in medical ultrasonography with drug loadings in the mesopores.