以聚苯乙烯(PS)乳液为模板，首先合成了PS/TiO2复合微球，采用回流溶解出PS模板的方法，制备出纳米级 TiO2中空球.探讨了不同单体浓度、引发剂用量、乳化剂用量以及反应温度对聚苯乙烯乳液的影响.利用XRD、TG、BET、IR和UV-Vis手段对合成的纳米颗粒进行了表征.研究发现80℃下，单体浓度占总质量的20％、引发剂和乳化剂分别为单体质量的0．3％和3％、回流时间为12 h时，可以得到外径为180 nm、比表面积为283．4 m2/g的TiO2中空球，且中空球的壳层由大量粒径为8~10 nm的TiO2颗粒紧密堆积而成.
PS/TiO2 microspheres were synthesized with PS emulsion as templates.Nano hollow TiO2 micro-spheres was formed through refluxing the nano emulsion and dissolving the PS template in the PS/TiO2 micro-spheres.The effects of different monomer concentration,the dosage of initiator and emulsifier,the reaction temperature on the performance of PS emulsion were discussed.X-ray diffraction (XRD),thermogravimetric analyzer (TG),specific surface area tester (BET),infrared spectrum (IR)and ultraviolet-visible spectroscopy (UV-Vis)were used to characterize the microspheres.The optimal conditions were as follows,the concentra-tion of monomer was 20%,the ratios of the initiator and emulsifier to the monomer mass were 0.3% and 3%, respectively,the reflux time was 12 h at 80 ℃.The nano TiO2 hollow spheres with the external diameter and specific surface area about 180 nm and 283.4 m2/g were synthesized,respectively.The thin shell was composed of closely packed TiO2 nanoparticles with the diameter of 8-10 nm.
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