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首页> 外文期刊>International Journal of Quantum Chemistry >Needle-like calcium carbonate assisted self-assembly of mesostructured hollow silica nanotubes
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Needle-like calcium carbonate assisted self-assembly of mesostructured hollow silica nanotubes

机译：针状碳酸钙辅助介孔结构空心二氧化硅纳米管的自组装

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Mesostructured hollow, silica nanotubes (MHSNTs) were successfully produced via the self-assembly of C(16)TMABr and silica species on the surface of needle-like calcium carbonate nanoparticles in an alkaline medium at room temperature. The characterization of MHSNTs by transmission electron microscopy (TEM), scanning electron microscopy (SEM), pore size distribution (PSD) and Brunauer-Emmett-Teller (BET) indicated that MHSNTs had uniform tubular hollow structures with big openings, a length of 1.5-2.0 mu m, an inner diameter of 150-200nm at the open end and 50-60 nm at the closed end, and a wall thickness of 20-30 nm, as well as a narrow PSD around 2.3 nm in the shells and a BET surface area as high as similar to 975.3 m(2)/g. By small-angle X-ray diffraction (XRD), BET and pore structure analysis, it was found that more uniformly structured mesopores could be formed by the method of removing the double templates simultaneously through a solvent extraction process, as compared to the separate removal of the double templates by calcinating and then etching in an acidic solution, and the amount of C16TMABr affected the mesoporous structures of MHSNTs greatly. The formation processes of MHSNTs were also studied with XRD and FTIR. (c) 2005 Elsevier Inc. All rights reserved.
机译：介孔结构空心二氧化硅纳米管（MHSNTs）是通过在室温下在碱性介质中通过在针状碳酸钙纳米颗粒表面上自组装C（16）TMABr和二氧化硅物种而成功生产的。通过透射电子显微镜（TEM），扫描电子显微镜（SEM），孔径分布（PSD）和Brunauer-Emmett-Teller（BET）对MHSNT进行表征，结果表明MHSNT具有均匀的管状空心结构，开口大，长度为1.5 -2.0微米，开口端的内径为150-200nm，封闭端的内径为50-60 nm，壁厚为20-30 nm，以及壳中约2.3 nm的窄PSD和BET表面积高达975.3 m（2）/ g。通过小角度X射线衍射（XRD），BET和孔结构分析，发现与通过单独的方法通过溶剂萃取工艺同时去除双模板的方法相比，可以形成更均匀结构的中孔通过在酸性溶液中煅烧然后蚀刻来制备双模板，C16TMABr的量极大地影响了MHSNT的介孔结构。还利用XRD和FTIR研究了MHSNT的形成过程。 （c）2005 Elsevier Inc.保留所有权利。

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