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Citation: Zhang Yu-Ting, Yu Ming. Mechanism of the Formation of Uniform Spherical Colloidal Hematite[J]. Acta Physico-Chimica Sinica, ;1992, 8(06): 814-818. doi: 10.3866/PKU.WHXB19920619 shu

Mechanism of the Formation of Uniform Spherical Colloidal Hematite

Zhang Yu-Ting ,
Yu Ming

1.
Tianjin College of Textile Technology, Tianjin 300160

Received Date: 20 June 1991
Available Online: 15 December 1992

The formation of uniform spherical hematite particles, obtained by hydrolysis of ferric chloride at elevated temperatures, follows the mechanism of phase transformation from β-FeOOH to α-Fe_2O_3 and recrystallization from tiny α-Fe_2O_3 particles to spherical colliodal α-Fe_2O_3 uniform particles. A new viewpoint on the formation of uniform colloidal particles is suggested, that is, if uniform particles are to be formed by the mechanism of phase transformation-aggregation recrystallizationt, the secondary aggregations of tiny particles must be avoided after the first burst of aggregates. The relationship between initial time of reaching critical supersaturation with the aging temperature, pH and concentration of ferric chloride can be described by a three-parameter logarithmic linear equation.
- Phase transformation; Aggregation; Recrystallization; Critical supersaturation; Hydrolysis
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