2005/09/10 by Yves Méheust, Y. Meheust, Bjørnar Sandnes +22
Engineering · Materials Science · Physics and Astronomy · #Clay minerals and soil interactions #FOS: Physical sciences #Geotechnical and construction materials studies #Soft Condensed Matter (cond-mat.soft) #Soil and Unsaturated Flow #cond-mat.soft
paper · pdf · doi:10.48550/arxiv.cond-mat/0509267
5 pages, 7 figures
arxiv created 2005/09/10 · openalex publication_date 2005/09/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the diffusion of water in weakly-hydrated samples of the smectite clay Na-fluorohectorite. The quasi one-dimensional samples are dry compounds of nano-layered particles consisting of ~ 80 silicate platelets. Water diffuses into a sample through the mesoporosity in between the particles, and can subsequently intercalate into the adjacent particles. The samples are placed under controlled temperature. They are initially under low humidity conditions, with all particles in a 1WL intercalation state. We then impose a high humidity at one sample end, triggering water penetration along the sample length. We monitor the progression of the humidity front by monitoring the intercalation state of the particles in space and time. This is done by determining the characteristic spacing of the nano-layered particles in situ, from synchrotron wide-angle X-ray scattering measurements. The spatial width of the intercalation front is observed to be smaller than 2mm, while its velocity decreases with time, as expected from a diffusion process.