Mobility of Water Adjacent to Mineral Surfaces
1964
Kemper, W. D. | Maasland, D. E. L. | Porter, L. K.
Mobility of water adjacent to Na- and Ca-saturated bentonite surfaces was estimated from diffusion rates of deuterium hydroxide in oriented clay pastes at several moisture contents. The first molecular layer of adsorbed water on Na- and Ca-clays had mobilities which were 30 and 5%, respectively, of the mobility of water molecules in bulk water. There was an indication of a slight reduction in mobility of water as far as 40Å. From the sodium-saturated clay. However, water more than three molecular layers from the solid surface had mobilities which were 60% of the mobility in bulk water. The mobility data indicate that water outside the first adsorbed molecular layer does not have viscosities more than 2.5 times the viscosity of bulk water.
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