Density of Water on Kaolinite Surface

The density of water at kaolinite-water interface was estimated by measuring the volumetric change of a clay-organic system which occurred when clay-organic liquid interface was converted into clay-water interface. A definite amount of drops of water which had been previously introduced to the clay-water interface. A definite amount of drops of water which had been previously introduced to the clay-organic system was spread over the clay surface by stirring. The thickness of the layer of the abnormal water molecule on kaolinite was compared with that of pyrophyllite.It was confirmed that the density of water from one to several molecular layers on kaolinite surface was less than that of ordinary water, indicating a looser structure. The density of the abnormal water was the lowest at the completion of coverage on kaolinite and amounted to a few percent less than that of ordinary water. The abnormal water was detected on pyrophyllite, but the thickness of it was shown to be smaller than that of kaolinite.