Water activity in aqueous solutions of inhomogeneous electrolytes

被引:17
作者
Dutkiewicz, E [1 ]
Jakubowska, A [1 ]
机构
[1] Adam Mickiewicz Univ, Dept Phys Chem, PL-60780 Poznan, Poland
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 45期
关键词
D O I
10.1021/jp991632e
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The activity of water in the bulk aqueous and surface regions of inhomogeneous solutions of electrolytes was determined by the method based on hydration of aldehydes. The inhomogeneous solutions of electrolytes used in the study were those of spherical and rodlike SDS micelles. It was established that in the bulk aqueous phase of the micellar SDS solution the change of the water properties was mainly determined by the anions of the electrolyte. Chloride and perchlorate ions were found to decrease the water activity. The change of water properties in the surface micellar phase of SDS solution is mainly determined by the cations of the electrolyte; sodium and ammonium ions decrease a(Ws), while potassium and magnesium ions increase it. From an analysis of the electrolyte concentration effect on the water activity the micellar sphere-rod transition has been estimated.
引用
收藏
页码:9898 / 9902
页数:5
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