213 アルコキシド法によるチタニア微粒子の合成と形状制御

抄録

The control of nucleation and growth rates of spherical titania particles has been examined for the alkoxide method using surfactant, Hydroxypropyl cellulose. The synthesis is performed in a BtOH solvent containing a co-solvent, Acetonitrile, Dimethylacetamide(DMA) or Dimethylformamide(DMF). DMA and DMF with the high hydrogen-bond ability are strongly adsorbed on the surface of titania particles to reduce its growth rate. The finest particle size and narrow distribution of resultant titania can be attained by a newly developed "Urea-method", where the homogeneous nucleation is provided by way of uniform increase in pH through the hydrolysis of urea after the dispersion of H_2O inside the reactant solutions.