白色顔料開発を目指したチタニア被覆シリカ複合中空粒子の合成.

Titania coated silica hollow particles were developed as a white pigment to prevent their sedimentation during storage. The hollow silica particles used in this study have porous structure, which is expected to have both scatter and transmit visible light to help to improve the titania's covering power. The template for such porous structure was prepared by gathering nano-sized calcium carbonate via CO₂ gas bubbling method. For the titania coating, acetic acid was used to control too quick chemical reaction of titania precursor by forming chelate compound. The molar ratios of water/titania and reaction temperature were optimized. The obtained titania coated hollow silica particles exhibited higher whiteness than the commercial TiO₂. [ABSTRACT FROM AUTHOR]