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聚乙烯吡咯烷酮(PVP)功能化的聚苯乙烯(PS)粒子在SiO2包覆的同时被乙醇/氨水介质溶解,得到了单分散空心SiO2纳米微球.该空心SiO2纳米微球的尺寸和形态可以通过PVP,NH4OH和正硅酸乙酯(TEOS)的用量来调节.PVP用量增加导致PS粒子变小,从而得到较小的空心SiO2纳米微球;NH4OH用量增加,空心SiO2纳米微球表面变得粗糙;TEOS用量增加,空心SiO2纳米微球的壳层厚度增加.包覆(溶解)温度是控制空心SiO2纳米微球形成的最有效手段.在70℃的包覆(溶解)温度下可以获得全部空心的SiO2纳米微球。
Polyvinylpyrrolidone (PVP) functionalized polystyrene (PS) particles were dissolved in ethanol / aqueous ammonia while being coated with SiO2 to obtain monodisperse hollow SiO2 nanospheres. The size and morphology of the hollow SiO2 nanospheres can be The content of PVP, NH4OH and TEOS was adjusted, and the increase of the amount of PVP led to the decrease of PS particles, which led to the smaller hollow SiO2 nanospheres. The amount of NH4OH increased and the surface of hollow SiO2 nanospheres became rough ; The amount of TEOS increases and the shell thickness of hollow SiO2 nanospheres increases.The coating (dissolution) temperature is the most effective method to control the formation of hollow SiO2 nanospheres.All hollows can be obtained at the coating (dissolution) temperature of 70 ℃ Of SiO2 nanospheres.