温度对介孔二氧化硅形貌和介相结构有序性的影响

1992年Kresge等科学工作者首次报道了一种新颖的介孔二氧化硅材料,介孔二氧化硅的合成及其性能表征引起了广泛的研究兴趣1,2]。这种材料由于具有高比表面积(1000~1400m2·g-1)、孔道排列有序、孔径分布窄并可以在2~10nm范围内可调等优点,所以有望用于催化与吸附、化学传感、纳

Effect of Temperature on the Morphologies and the Mesostructure Ordering of Mesoporous Silica

Silica particles with rod-like and top-like morphologies have been controllably synthesized with a basic medium. The characteristics of the mesoporous silica particles were characterized by X-ray diffraction (XRD), nitrogen sorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). The results indicate that temperature affects the macrostructures and mesostructure ordering of mesoporous silica. At lower temperature highly ordered mesoporous silica with hexastyle and top structure could be obtained under different alkalinity. As the temperature increases, mesoporous silica transforms to a rod-like shape and the aspect ratio of length/diameter decreases with the decrease of the order of mesostructure. When the temperature is high enough, spherical particles could be prepared and there are still defects existing in mesostructure.