Abstract
Wetting contact angles were measured for glycerol and diiodome-thane drops on pellets made of bentonite samples exchanged with Li +, Na +, K +, Mg 2+, Ca 2+, Sr 2+ and Ba 2+ cations. Based on the contact angle values, the dispersion and nondispersion components of the homoionic bentonite surface free energy were calculated using a modified Young equation. The exchangable cations did not cause a great difference in the dispersion components of the surface free energy and the values were similar to those for natural bentonite. However,the nondispersion components differed markedly among themselves and also from the value for natural bentonite. A linear relationship was also found between the nondispersion components of the surface free energy and the entropy of hydration of the exchanged cations, except K + and Ba 2+.
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