SOLUTE CLUSTERS IN AQUEOUS CITRIC-ACID SOLUTIONS

被引：29
|
作者：
OHGAKI, K [1 ]
MAKIHARA, Y [1 ]
MORISHITA, M [1 ]
UEDA, M [1 ]
HIROKAWA, N [1 ]
机构：
[1] KANEGAFUCHI CHEM IND CO LTD,TAKASAGO 676,JAPAN
来源：
CHEMICAL ENGINEERING SCIENCE | 1991年 / 46卷 / 12期
关键词：
D O I：
10.1016/0009-2509(91)85029-W
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Densities of aqueous citric acid monohydrate solutions are examined at three different concentrations. Two supersaturated solutions exhibit density gradients in a vertical column, but a saturated solution does not. The density gradients can be expressed satisfactorily by use of a theoretical model based on the Brownian diffusion equation for solute clusters under gravity. Electron microscopy also strongly suggests the existence of solute clusters in supersaturated solutions. The cluster size is estimated to be about 16 nm in diameter. Ultraviolet-ray scattering suggests a possible secondary structure of cluster aggregations.
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页码：3283 / 3287
页数：5
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