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通过Stber法制备粒径约100 nm的SiO2纳米粒子,并以非离子表面活性剂嵌段共聚物为模板剂在纳米粒子表面再合成介孔SiO2层。在磷酸盐诱导剂的作用下可使核/壳结构的纳米粒子快速沉淀出来。再通过煅烧除去表面活性剂获得粒径均匀的球形介孔纳米载体。通过动态光散射(DLS)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)、比表面积测定(BET)和氮气吸附脱附测定等技术对材料进行表征。纳米载体的平均有效粒径约为183 nm,介孔孔道为5.5 nm,具有良好的分散性(PDI:0.076),比表面积高达158.6 m2/g,孔容积0.22 cm3/g。结果表明,该法可以简单快速地制备纳米载体。
The SiO2 nanoparticles with a diameter of about 100 nm were prepared by Stöber method and the mesoporous SiO2 layer was synthesized on the surface of the nanoparticles by using the nonionic surfactant block copolymer as a template. Under the action of phosphate inducer, the nanoparticles of core / shell structure can be quickly precipitated. And then remove the surfactant by calcination to obtain spherical mesoporous nanocarriers with uniform particle size. The materials were characterized by DLS, SEM, TEM, XRD, BET and N2 adsorption desorption. The nanocarrier has an average effective diameter of about 183 nm and a mesoporous channel of 5.5 nm with good PDI (0.076), a specific surface area of 158.6 m2 / g and a pore volume of 0.22 cm3 / g. The results show that this method can be used to prepare nanocarriers easily and rapidly.