扫描电子显微镜
傅里叶变换红外光谱
透射电子显微镜
溶解
材料科学
多孔性
胶体
化学工程
纳米
解吸
吸附
吸收(声学)
胶体二氧化硅
纳米技术
化学
复合材料
工程类
有机化学
涂层
作者
Tierui Zhang,Qiao Zhang,Jianping Ge,James Goebl,Minwei Sun,Yushan Yan,Yi‐Sheng Liu,C. L. Chang,Jinghua Guo,Yadong Yin
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.
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