超音波分散した酸化チタンナノ粒子スラリーの安定性 Stability of Ultrasonicated TiO_2 Nanoparticles Slurry
Dispersion behavior of aqueous suspensions of TiO<SUB>2</SUB> nanoparticles were investigated by putting polyacrylic acids, PAA, with various molecular weights ranging from 1200 to 30000. Suspensions with solid fraction of 15 vol% were prepared by ultrasonication and milling with 5-mm balls. The dispersion stability was evaluated by sedimentation test and re-dispersion behavior of sediment as well as mesurement of slurry viscosity and aggregate size. The dispersion stability in suspensions after ultrasonic treatment was much higher than those by ball milling. Sediments from ultrasonicated slurry could easily return to the condition of original slurry even by slow stirring, however, sediments from ball milled one could not recover. The optimum molecular weight of PAA for re-dispersion behavior of the sediment by ultrasonic treatment was 8000 g/mol.
粉体および粉末冶金 55(4), 263-269, 2008-04-15
Japan Society of Powder and Powder Metallurgy