物理化学学报 >> 1994, Vol. 10 >> Issue (06): 532-535.doi: 10.3866/PKU.WHXB19940610

研究论文 上一篇    下一篇

乙醇在相转化中的抑制作用

张玉亭, 戴仲善, 于洺, 张国春   

  1. 天津纺织工学院纺化系,天津 300160
  • 收稿日期:1993-02-18 修回日期:1993-06-14 发布日期:1994-06-15
  • 通讯作者: 张玉亭

Alcohol as Inhibitor in Phase-transformation

Zhang Yu-Ting, Dai Zhong-Shan, Yu Ming, Zhang Guo-Chun   

  1. Tianjin College of Textile Technology, Tianjin 300160
  • Received:1993-02-18 Revised:1993-06-14 Published:1994-06-15
  • Contact: Zhang Yu-Ting

摘要:

实验表明在发生相转化的FeCl_3-HCl水解体系中,醇的存在起到了相转化抑制剂的作用,降低了α-Fe_2O_3沉淀组分的过饱和浓度,减少了成核数目,有利于形成较大的均匀胶体粒子.粒子尺寸随浓度的增加而加大,形状因球形趋变为立方体.

关键词: 相转化, 抑制剂, 过饱和浓度, 成核过程

Abstract:

Alcohol, presented in the hydrolysis of ferric chloride at elevated temperature, inhibits the phase transformation from β-FeOOH to α-Fe_2O_3, reduces the supersaturation of the precipitated species α-F_2O_3, decreases the number of nucleation and therefore favours the formation of much larger uniform α-F_2O_3 particles. With increasing amount of alcohol, the sizes of particles increase, while the shapes of them change gradually from sphere to cube.

Key words: Phase-transformation, Inhibitor, Supersaturation, Nucleation