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

Chem. J. Chinese Universities ›› 1991, Vol. 12 ›› Issue (2): 259.

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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

Department of Chemistry, Jilin University, Changchun, 130023

Received:1989-05-09 Online:1991-02-24 Published:1991-02-24

Abstract

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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Wang Zi-chen, Zhang Li-hua, Yang Yong-hua, Zhao Mu-yu . Studies on the Characteristics of Metastable Zone of the Aqueous K₂SO₄Solution (Ⅲ)--The Induction Period of Nucleation[J]. Chem. J. Chinese Universities, 1991, 12(2): 259.

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

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