PREPARATION AND CHARACTERIZATION OF THICK AND STABLE SOL OF β-FeOOH NANO-PARTICLES

抄録

Partial neutralization of FeCl₃ solution gives sol of akaganeite (β-FeOOH). We examined the effects of neutralization rare and salt concentration during aging on the size and stability of formed particles. We found that instantaneous neutralization and immediate desaltation is the necessary condition to obtain stable sol of nano-particles of akaganeite. The approximate size of particles obtained by neutralizing 1 mol L^-1FeCl₃ solution by instantaneous mixing with solid NaHCO₃ at a NaHCO₃/Fe mol ratio of 2.0 and immediately desaltation by dialysis was 30 Å in width and 120 Å in length. The size of the particles in the sol did not change even after 6 months. The sol particles had a specific surface area of 380 m² g^-1.