Abstract
Pre-commercial scale production experiments were carried out to obtain needlelike α-FeOOH fine particles using bubble column reactors in a batch-wise method.
The distribution of the particle length along the major axis (l) and minor axis (d) were measured by transmission electron micrographs.
From the arithmetic mean length on the major axis (la) and that on the minor axis (da), the aspect ratio (la/da) and the coefficient of variation (σl/la) in l were calculated.
The relations between specific surface area of the particles (Se) and la, la/ da, da and σl/la, were investigated respectively.
Further investigations were made concerning the uniformity of distribution of l graphically.
