Dispersion control of Fe_2O_3 nanoparticles using a mixed type of mechanical and ultrasonic milling

摘要

α-Fe_2O_3 nanoparticles with controlled dispersion were obtained by using a mixed type of mechanical and ultrasonic milling with the addition of surfactant, in which particle refinement was done mechanically, and dispersion was done physically and chemically. The particle refinement and dispersion degree of the α-Fe_2O_3 were examined by TEM observation and analyses of turbidity as well as FT-IR spectra of the particle-dispersed solution. Smaller particle size and addition of 1 % n-octyl alcohol surfactant make the dispersion effect better. This improved dispersion of the nanoparticles was attributable to increased adsorption of hydroxide ions on α-Fe_2O_3 nanoparticle surfaces as its area increased.