高等学校化学学报 ›› 1991, Vol. 12 ›› Issue (2): 259.

• 论文 • 上一篇    下一篇

硫酸钾水溶液亚稳区性质的研究(Ⅲ)--成核诱导期

王子忱, 张丽华, 杨永华, 赵慕愚   

  1. 吉林大学化学系, 130023
  • 收稿日期:1989-05-09 出版日期:1991-02-24 发布日期:1991-02-24
  • 通讯作者: 王子忱
  • 基金资助:

    国家自然科学基金

Studies on the Characteristics of Metastable Zone of the Aqueous K2SO4Solution (Ⅲ)--The Induction Period of Nucleation

Wang Zi-chen, Zhang Li-hua, Yang Yong-hua, Zhao Mu-yu   

  1. Department of Chemistry, Jilin University, Changchun, 130023
  • Received:1989-05-09 Online:1991-02-24 Published:1991-02-24

摘要: 按照过饱和溶液产生的方式,研究其亚稳态行为可分为两种类型:一是研究亚稳区宽度随过饱和度(或过冷度)的变化;二是测量恒定过饱和度下的诱导期。前者在前文中已进行了分析讨论。本文旨在测定K2SO4水溶液诱导期的基础上,进行理论分析和成核特征值的计算,并将两种方法加以比较。

关键词: 硫酸钾水溶液, 成核, 诱导期

Abstract: The induction periods of nucleation for the aqueous K2SO4solution were measured. It can be concluded that the value of nucieation kinetics exponent m provided by the measurements of metastable zone widths is in better agreement with that obtained by measuring the induction periods of nucleation. At the low supersaturation region, experimental results deviate from the theoretical characteristics of homogeneous nucleation. The results seem to indicate that at low supersaturation region(S<1. 08), the heterogeneous nucteation mechanism is dominant. In the high supersaturation region(S>1.1),the homogeneous nucleation becomes the rate-controlling step.

Key words: Aqueous K2SO4solution, Nucleation, Induction period

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