The titania hollow microspheres with incontinuous multicavities were successfully fabricated via an oil/ water （O/W） emulsion process accompanied by sol-gel reaction in the presence of polyvinylpyrrolidone （PVP）. ...The titania hollow microspheres with incontinuous multicavities were successfully fabricated via an oil/ water （O/W） emulsion process accompanied by sol-gel reaction in the presence of polyvinylpyrrolidone （PVP）. In the one-step route, the addition of PVP to the tetrabutyl titanate （TBT） 1-octano] solution as the oil phase of the O/W emulsion clearly expands the size of the cavities inside the microspheres. The n- propanol and atoleine alters the polarity of the oil phase to affect the interior structure significantly. The Span 80 is used as a stabilizer to preserve spherical shape. A preliminary mechanism based on phase- separation for the structural evolution of titania hollow microspheres with multicavities is suggested. Zirconia and alumina hollow microspheres with incontinuous multicavities can also be prepared by this one-step route successfully.展开更多
基金supported by the National Natural Science Foundation of China (No. 51372225)Zhejiang Provincial Natural Science Foundation of China (No. LY13B010001)
文摘The titania hollow microspheres with incontinuous multicavities were successfully fabricated via an oil/ water （O/W） emulsion process accompanied by sol-gel reaction in the presence of polyvinylpyrrolidone （PVP）. In the one-step route, the addition of PVP to the tetrabutyl titanate （TBT） 1-octano] solution as the oil phase of the O/W emulsion clearly expands the size of the cavities inside the microspheres. The n- propanol and atoleine alters the polarity of the oil phase to affect the interior structure significantly. The Span 80 is used as a stabilizer to preserve spherical shape. A preliminary mechanism based on phase- separation for the structural evolution of titania hollow microspheres with multicavities is suggested. Zirconia and alumina hollow microspheres with incontinuous multicavities can also be prepared by this one-step route successfully.
