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

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Partial neutralization of FeCl_3 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^-1 FeCl_3 solution by instantaneous mixing with solid NaHCO_3 at a NaHCO_3/Fe mol ratio of 2.0 and immediately desaltation by dialysis was 30Å in width and 120Å 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 m^2 g^-1.
日本粘土学会の論文