在材料化学中,有效地控制纳米化合物的尺寸和形状一直是人们追求的目标.但由于裸露在空气中的纳米粒子很容易团聚,因而难以对其尺寸进行有效控制.在多孔材料的体系中控制合成纳米粒子,以使其稳定存在是克服粒子团聚问题的一个有效方法.介孔硅材料由于具有较大的比表面积和孔容而被视为制备超微金属纳米结构的有效的纳米反应器.
Silver nanoparticles were prepared in the channels of mesoporous silica SBA-15 through silver mirror reaction. The results of X-ray diffraction (XRD) and transmission electron microscopy (TEM) reveal that Ag nanoparticles with uniform size about 2-3 nm were dispersed inside the channels of mesoporous SBA-15. UV-Vis absorption spectra indicate the quantum size effect of the Ag nanoparticles. Bacteriological tests were performed in Luria-Bertani (LB) medium on solid agar plates and in liquid systems supplemented with different concentrations of Ag/SBA-15. This nanocomposite was shown to be an effective bactericide against Staphylococcus.