Abstract
Nuclear magnetic resonance (NMR) measurements of water intercalated into kaolinite identify two types of interlayer water, one of which is more mobile than the other. This is consistent with previous work by P. M. Constanzo, R. F. Giese, and M. Lipsicas [ Clays Clay Miner. 32, 419 (1984)], and suggests that the less mobile water is attached to the tetrahedral surface (hole water) and that the more mobile water (associated water) is less strongly bonded to the clay surface. Both types of water are found in a 10-Å hydrate while only hole water is present in 8.4- and 8.6-Å hydrates. Motions of both types of water are slower than bulk water. Above 260 K, an anomaly in the specific heat of the water in the 10-Å hydrate is observed. The NMR measurements suggest that this is associated with a transition involving two-dimensional melting.
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