Wettability Contrasts in Kaolinite and Illite Clays : Characterization by Infrared and X-ray Absorption Spectroscopies J.-L. Bantignies, C. Cartier Dit Moulin et H. Dexpert J. Phys. IV France, 7 C2 (1997) C2-867-C2-869 DOI: 10.1051/jp4:1997261