Spatial and temporal in situ evolution of the concentration profile during casein micelle ultrafiltration probed by small-angle x-ray scattering

被引：36

作者：

David, C. ^{[1
]}

Pignon, F. ^{[1
]}

Narayanan, T. ^{[2
]}

Sztucki, M. ^{[2
]}

Gesan-Guiziou, G. ^{[3
]}

Magnin, A. ^{[1
]}

机构：

[1] UFJ Grenoble 1, CNRS, Lab Rheol, INPG,UMR 5520, F-38041 Grenoble 9, France

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[3] INRA, UMR Sci & Technol Lait & Euf 1253, F-35042 Rennes, France

来源：

LANGMUIR | 2008年 / 24卷 / 09期

关键词：

D O I：

10.1021/la703256s

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Understanding the mechanisms involved in structural development in the vicinity of membrane constitutes a considerable challenge in the improvement of ultrafiltration process in industrial applications. In situ small-angle X-ray scattering (SAXS) performed with custom-made ultrafiltration cell has permitted the structural arrangement to be probed and concentration profiles to be obtained in deposited layers during frontal filtration of casein micelle suspension. SAXS allowed the structure of the accumulated layers of casein micelles between 280 mu m and I mm from the membrane surface to be followed at length scales from a few nanometers to about 100 nm. These results have been combined with hydrodynamic measurements (permeation flux) and theological investigations. Under frontal filtration, the time dependence of concentration at different distances from the membrane surface has been obtained. This temporal evolution is marked by an exponential increase of the concentration followed by a slower growth which has been associated with a change in the theological behavior of the suspension from Newtonian to shear thinning behavior.

引用

页码：4523 / 4529

页数：7

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