Abstract
The affinity of clay minerals for water has been investigated by determining their heat of immersion. Clay samples chosen are unground or ground kaolinite and dickite from the two layered-minerals, and ground pyrophyllite and talc from the three layered-minerals. The two layered-minerals showed higher heat of immersion values than the three layered-minerals, which probably results from the higher negative charge densities and the exposed OH ions in the structure of the former.Ground dickite, dry-ground one in particular, exhibited a markedly higher heat of immersion value than unground samples, suggesting that the newly produced edge surfaces have the highest affinity for water.Preadsorption of water reduced steeply the surface energies of Na-dickite and Na-pyrophyllite toward the surface energy of free water where nearly two molecular adsorption had been completed.
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