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    題名: A Self-Templated Route to Hollow Silica Microspheres
    作者: Zhang, Tierui;Zhang, Qiao;Ge, Jianping;Goebl, James;Sun, Min-wei;Yan, Yushan;Liu, Yi-sheng;張經霖;Chang, Ching-lin;Guo, Jinghua;Yin, Yadong
    貢獻者: 淡江大學物理學系
    日期: 2009-02
    上傳時間: 2010-08-09 15:46:34 (UTC+8)
    出版者: American Chemical Society (ACS)
    摘要: A simple, mild, and effective self-templated approach has been developed to directly convert solid SiO2 microspheres into hollow structures. The reaction involves initial partial dissolution of silica cores in a NaBH4 solution and subsequent shell formation due to the redeposition of the silicate species back onto the colloid surfaces. The increasing concentration of NaBO2 as the result of the slow decomposition of NaBH4 in water is found to be responsible for the regrowth of the silica shell. This method allows the production of hollow silica spheres with sizes ranging from 70 nanometers to several micrometers, largely determined by the size of the starting silica colloids. The solid-to-hollow transformation mechanism is investigated in detail by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier Transform Infrared (FTIR) spectrometry, X-ray absorption spectroscopy (XAS), N2 adsorption−desorption, and X-ray diffraction (XRD). We also study the reaction conditions that allow control over the wall thickness, surface morphology, and shell porosity.
    關聯: Journal of Physical Chemistry C 113(8), pp.3168-3175
    DOI: 10.1021/jp810360a
    顯示於類別:[物理學系暨研究所] 期刊論文

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