Synthesis of silica nanoboxes from inorganic precursor and template
This paper presents the synthesis of novel silica (SiO2) nanoparticles with cubical hollow interiors structure (denoted as SiO2 nanoboxes). This approach provides a quite low-cost route to prepare the silica nanoboxes by using cubic CaCO3 nanoparticles as template, and sodium silicate (Na2SiO3) as precursor. The silica shell was formed on the surface of the cubic CaCO3 nanoparticles, calcined at lower temperature to increase shell strength, and then the CaCO3 cores were dissolved in diluted HNO3 solution under sonication. The products were characterized by transmission electron microscopy (TEM), fourier transformation infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and Barret-Emmet-Teller measurements. The size of the hollow core and the wall thickness (from 5 to 10 nm) can be controlled by changing the size of cubic CaCO3 nanoparticles and the weight ratios of SiO2/CaCO3. The SiO2 nanoboxes have a large adsorption property. This synthesis route can fabricate stable SiO2 nanoboxes, and it may also be used to prepare various other hollow silica materials.
Silica Nanoboxes Calcium carbonate Core-shell Template
哈日巴拉 于艳辉 张义顺
河南理工大学材料科学与工程学院,焦作,454003
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）