A. Saada et al., COMPARISON OF THE HYDROPHILICITY HYDROPHOBICITY OF ILLITES AND KAOLINITES/, Journal of colloid and interface science, 174(1), 1995, pp. 185-190
Asphaltene and water adsorption isotherms on clay surfaces have been d
etermined to approach the hydrophilic/hydrophobic character of several
samples of kaolinites and illites. It is shown that the nature and th
e genesis condition of the clays affect the adsorption of both asphalt
ene and water. A larger amount of asphaltene is adsorbed on kaolinites
while illites show more affinity for water. Cation hydration is shown
to be responsible for part of the total hydrophilicity of the clays.
It is also found that 25% of the kaolinite surface is hydrophilic, whe
reas this value extends to 40% for illite. Finally, it is shown that h
ydrophilicity decreases, whereas asphaltene adsorption increases. (C)
1995 Academic Press, Inc.