Imaging of colloidal deposits in granular porous media by X‐ray difference micro‐tomography
Imaging of colloidal deposits in granular porous media by X‐ray difference micro‐tomography
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DOI：
10.1029/2007gl030514
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发表时间：
2007-09
影响因子：
5.2
通讯作者：
J. Gaillard;Cheng Chen;S. H. Stonedahl;B. Lau;D. Keane;A. Packman
中科院分区：
文献类型：
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作者：
J. Gaillard;Cheng Chen;S. H. Stonedahl;B. Lau;D. Keane;A. Packman
基于同步加速器的高分辨率X射线计算机微断层扫描（X - CMT）用于识别多孔介质中形成的胶体沉积物的形态。我们表明，通过吸收边缘进行断层扫描重建的差异显微断层扫描提供了关于胶体颗粒沉积形成的聚集体的性质和位置的有价值的信息。柱实验使用由玻璃珠组成的理想多孔介质进行，通过玻璃珠运输胶体ZrO2颗粒。多孔介质和聚集体结构的层析成像重建为观察胶体颗粒沉积及其形态提供了独特的机会。这些结果表明，局部孔隙几何形状控制着颗粒沉积，并且在多孔介质中沉积倾向于以相当不均匀的方式形成。
High resolution synchrotron‐based X‐ray computed microtomography (X‐CMT) was used to identify the morphology of colloidal deposits formed in porous media. We show that difference microtomography ‐ whereby a tomographic reconstruction is performed across an absorption edge ‐ provides valuable information on the nature and location of the aggregates formed by the deposition of colloidal particles. Column experiments were performed using an idealized porous medium consisting of glass beads through which colloidal ZrO2 particles were transported. Tomographic reconstructions of the porous medium and of the aggregate structure provide an unique opportunity to observe colloidal particle deposits and of their morphology. These results show that the local pore geometry controls particle deposition and that deposits tend to form in a rather heterogeneous manner in the porous medium.