Force Measurements between Silanated Silica Surfaces in Aqueous CuSO4 Solutions at Various pHs
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چکیده
It is well known that adsorption density of a multivalent metal ions (M) on a variety of substrates increases sharply only at pHs where the concentration of the singly-charged hydroxo complex (M(OH)(z-1)) is appreciable (1-4). In Chapter 4, a new mechanism was proposed to explain why adsorption of these hydroxo-complexes may be thermodynamically more favorable than that of the unhydrolyzed metal ions. This mechanism will be explained here briefly; for a more detailed description, the reader is referred to Chapter 4. We proposed that the free energy of adsorption (∆Gads) of a hydroxo-complex is given by the sum of coulombic (∆Gelec) and specific chemical (∆Gchem) contributions:
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