无定形介孔SiO_2纳米粉体的仿生合成及表征(英文)

Biomimetic synthesis and characterization of amorphous mesoporous SiO_2

以酵母细胞为模板,采用共沉淀法制备了具有介孔结构的无定形SiO2纳米粉体。采用X射线衍射(XRD)测试出合成的材料为无定形结构,通过氮气吸附-脱附测试证明样品中含有介孔结构,并且样品的比表面积为443.18m2/g,BJH吸附平均孔径为6.24nm。样品的介孔结构也通过TEM得到证实。采用红光光谱测试分析了样品的化学键的键链情况。最后对其合成机理进行了分析,并画出了合成机理的简单模拟图。

Amorphous SiO2 materials with mesoporous structure were synthesized by co-precipitation method using yeast cells as a template. The X-ray diffraction (XRD) pattern indicated that the as-synthesized mesoporous SiO2 was an amorphous structure. The Barrett-Joyner-Halenda (BJH) models revealed the existence of mesostructure in the sample,which had a specific surface area of 443.18m2/g and a BJH adsorption average pore size of 6.24nm. Transmission electron microscopy (TEM) measurements confirmed the mesoporous structure of the resulting samples. The chemical bond linkages of the samples were performed by Fourier transform infrared (FT-IR) spectroscopy. A possible mechanism for the formation of biotemplated mesoporous SiO2 was proposed.