H2O self-diffusion restricted by clay platelets with immobilized bound H2O layers: PGSE NMR study of water-rich saponite gels

MRI profiles over very wide concentration ranges: Application to swelling of a bentonite clay

“…Spin relaxation times provide very sensitive probes of the bentonite content in clay/water suspensions [8,9,20]. Hence, clay density maps can be acquired using T 1 -imaging techniques if there exists a monotonic calibration function that relates T 1 times to clay content.…”

Diffusive transport of water in porous feldspars from granitic saprolites: In situ experiments using FTIR spectroscopy

“…Physical and chemical interaction of water with pore walls is restricted to a narrow zone of <1 nm at the wall (e.g., Kemper, 1960;Kemper et al, 1964;Marchesi, 1983;Barabino et al, 1984;Smith et al, 2004;Nakashima and Mitsumori, 2005). Considering the large ratio of pore diameters to the diameters of the transported species, a continuum description of diffusive transport of water solutes through the porous medium is valid if the pore size is greater than 5-10 nm (Sato, 1999 and references therein;Smith et al, 2004).…”

Typology, morphology and connectivity of pore space in claystones from reference site for research using BIB, FIB and cryo-SEM methods

“…In our samples and based on segmented porosity, the evolution of the effective porosity in function of the bound-water layer thickness shows that increasing the thickness of bound-water layer results in decreasing of the effective porosity as a semi-linear function, which suggests that with increasing bound-water layer thickness pores usually do not segment into smaller ones. Following ( [15], [16]) typical bound water is 2-6 nm thick. Thus, we estimated that the effective porosity represents between 90 and 70% of the porosity imaged in this contribution.…”