ACS Appl Mater Interfaces. 2010 Apr;2(4):957-60. doi: 10.1021/am100051z.
Monodispersed SiO(2)-shell/ZnO-core composite nanospheres have been prepared in an oil-in-water microemulsion system. By using cyclohexane as the oil phase and Triton X-100 as the surfactant, composite nanospheres with high core loading levels and tunable shell thickness were obtained. Utilization of PVP capping agent on ZnO allowed the synthesis of composite nanospheres without forming any coreless SiO(2) spheres or shell-less ZnO particles. The photoactivity of ZnO nanoparticles was greatly reduced by SiO(2)-coating, which enables their applications as durable, safe, and nonreactive UV blockers in plastics, coating, and other products.
单分散二氧化硅（SiO2）-壳/氧化锌（ZnO）核复合纳米球已在油包水微乳液体系中制备。以环己烷为油相，Triton X-100 为表面活性剂，得到了具有高核负载水平和可调壳厚的复合纳米球。利用 PVP 封端剂对 ZnO 的修饰作用，可在不形成任何无核 SiO2 球或无壳 ZnO 颗粒的情况下合成复合纳米球。SiO2 涂层大大降低了 ZnO 纳米颗粒的光活性，使其能够作为耐用、安全、无反应性的 UV 阻滞剂应用于塑料、涂料和其他产品中。
