Hydrology and Land Surface Studies
Imaging of colloidal deposits in granular porous media by X-ray difference micro-tomography
Article first published online: 21 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 18, September 2007
How to Cite
2007), Imaging of colloidal deposits in granular porous media by X-ray difference micro-tomography, Geophys. Res. Lett., 34, L18404, doi:10.1029/2007GL030514., , , , , and (
- Issue published online: 21 SEP 2007
- Article first published online: 21 SEP 2007
- Manuscript Accepted: 30 JUL 2007
- Manuscript Revised: 12 JUL 2007
- Manuscript Received: 27 APR 2007
- porous media
 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.