物理化学学报 >> 1992, Vol. 8 >> Issue (06): 814-818.doi: 10.3866/PKU.WHXB19920619

研究简报 上一篇    下一篇

均匀球形α-Fe2O3胶体粒子的形成机理

张玉亭; 于洺   

  1. 天津纺织工学院纺化系,天津 300160
  • 收稿日期:1991-06-20 修回日期:1992-01-03 发布日期:1992-12-15
  • 通讯作者: 张玉亭

Mechanism of the Formation of Uniform Spherical Colloidal Hematite

Zhang Yu-Ting; Yu Ming   

  1. Tianjin College of Textile Technology, Tianjin 300160
  • Received:1991-06-20 Revised:1992-01-03 Published:1992-12-15
  • Contact: Zhang Yu-Ting

关键词: 相转化, 聚集, 再结晶, 临界过饱和度, 水解

Abstract: 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.

Key words: Phase transformation, Aggregation, Recrystallization, Critical supersaturation, Hydrolysis