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首页> 外文期刊>Angewandte Chemie >A Shear Stress Regulated Assembly Route to Silica Nanotubes and Their Closely Packed Hollow Mesostructures
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A Shear Stress Regulated Assembly Route to Silica Nanotubes and Their Closely Packed Hollow Mesostructures

机译:剪切应力调节的组装路线到二氧化硅纳米管及其紧密堆积的空心介观结构。

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摘要

Self-assembly of amphiphilic molecules has enabled the fabrication of abundant nanostructured materials for different applications. Since the discovery of M41S family ordered mesoporous silicates numerous ordered mesopo-rous materials have been synthesized. Huo et al. have intensively investigated structure-directing roles of various quaternary ammonium surfactants, and phase transition between different silica-based mesophases. To date, different mechanisms for the formation of mesostructures have been proposed, like true liquid-crystal templating (LCT) and cooperative self-assembly (CSA), wherein the surfactant micelles are encapsulated in the frameworks of the other components as the consolidated phases. Particularly, Davis and co-workers have firstly suggested a "silicate rod assembly" route, where randomly ordered surfactant/silicate composite nanorods can spontaneously pack into a long-range ordered hexagonal arrangement. This mechanism, although it provides an explicit picture of the whole assembly process, still calls for more convincing evidences.
机译:两性分子的自组装使得能够制造用于不同应用的丰富的纳米结构材料。自从发现M41S族有序介孔硅酸盐以来,已经合成了许多有序介孔材料。霍等人。已经深入研究了各种季铵表面活性剂的结构指导作用,以及不同的基于二氧化硅的中间相之间的相变。迄今为止,已经提出了形成介观结构的不同机理,例如真正的液晶模板(LCT)和协同自组装(CSA),其中表面活性剂胶束被包裹在其他组分的框架中作为固相。特别是,戴维斯(Davis)和他的同事首先提出了“硅酸盐棒组装”路线,其中随机排列的表面活性剂/硅酸盐复合纳米棒可以自发堆积成长程有序六边形排列。这种机制尽管提供了整个组装过程的清晰画面,但仍需要更有说服力的证据。

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