Solute clusters in aqueous citric acid solutions
Solute clusters in aqueous citric acid solutions
复制标题
柠檬酸水溶液中的溶质簇
DOI：
10.1016/0009-2509(91)85029-w
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发表时间：
1991
影响因子：
4.7
通讯作者：
N. Hirokawa
中科院分区：
文献类型：
--
作者：
K. Ohgaki;Y. Makihara;M. Morishita;M. Ueda;N. Hirokawa
考察了三种不同浓度下柠檬酸一水溶液的密度。两种过饱和溶液在垂直柱中呈现密度梯度，而饱和溶液则没有。用重力作用下溶质团簇的布朗扩散方程的理论模型可以很好地表示密度梯度。电子显微镜也有力地表明在过饱和溶液中存在溶质团簇。据估计，该簇的直径约为16纳米。紫外线散射表明可能存在一种团簇的二级结构。
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.