Action-mass relationships, adsorption

Absorbance, relative, flocculation of silica hydrosols, 368-73 Acetyl groups, hydrophobic, PVA on PS latex particles, 89 Action-mass relationships, adsorption of soluble polymers, 29 Adsorbance... 

This is the important Hill-Langmuir equation. A. V. Hill was the first (in 1909) to apply the law of mass action to the relationship between ligand concentration and receptor occupancy at equilibrium and to the rate at which this equilibrium is approached. The physical chemist I. Langmuir showed a few years later that a similar equation (the Langmuir adsorption isotherm) applies to the adsorption of gases at a surface (e g., of a metal or of charcoal). 

The adsorption of the solutes by discrete one-to-one complexes was discussed by Soczewinski (77, 78). In this simple model equations for k value are derived by the application of the law of mass action to the competitive adsorption equilibria between solute and solvent molecules for the active sites of the adsorbent. It follows then that with an eluent mixture containing a polar solvent in an inert" nonpolar diluent, a linear relationship holds so that... 

While there are similar mass-balance and mass-action equations in all surface complexation models, there are a great number of ways to formulate the electrostatic energy associated with adsorption on charged surfaces. Customarily the electrostatic energy of an adsorbed ion of formal charge 2 at a plane of potential is taken by Coulomb s law to be zFt/r, but the relationships used to define surface potential t/r as a function of surface charge a, or any other experimentally observable variable, are different. In addition, different descriptions of the surface/solution interface have been used, that is, division of the interface into different layers, or planes, to which different ions are assigned formally. 

TABLE 19 Relationship Among Proton and Cation Adsorption Mass Action Constants Found in the Literature... 

---