【摘要】 在TritonX100/正己醇/环己烷/水体系中以钛酸正丁酯为原料,制备了粒径小,分散均匀的TiO2纳米粒子,研究了水与表面活性剂的摩尔比w(w=[H2O]/[表面活性剂])以及钛酸正丁酯浓度对粒径的影响.结果表明粒子平均粒径(D)与w存在明显的线性相关,可表示为:D=5.60+2.40w.而钛酸正丁酯浓度的影响较复杂,随着浓度从0.120mol/kg增加到0.246mol/kg,粒子粒径先减小,然后增大.此外,还采用激光粒度散射的方法表征了反相微乳体系水核的大小及分布,水核直径在5.5～8.8nm.更多还原

【Abstract】 By using titanium butoxide as reagent, Monodispersed TiO₂ nanoparticle with small size has been prepared in water-cylcohexane-hexanol-TritonX-100 microemulsion. The experiment shows that the molar ratio of water to surfactant （w=[H₂O]/[surfactant]） is the predominant factor to the particle size of TiO₂ and the concentration of titanium butoxide is in the next place. The relation between the average particle size （D） and the value of w can be shown: D=5.60+2.40w. On the other hand, the effect of titanium butoxide is complex. As the concentration of titanium butoxide increases from 0.120mol/kg to 0.246mol/kg, the TiO₂ particle size decreases firstly and increases subsequently. The size and distribution of water-cell in W/O microemulsion is investigated by laser scattering measurement. It can be shown from experimental results that the diameter of the droplet is between 5.5nm and 8.8nm and the average diameter is 7.0nm when the water-to-surfactant molar ratio is 6.1.更多还原