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Interaction with the Interface Attachment and Detachment

FIGURE 14.2 Molecule interacting with an interface through adsorption and desorption. [Pg.260]

The forward flux responds to c. and the fraction of unoccupied sorbent surface area [Pg.260]

9 = Tniax being the adsorbed amount when the sorbent surface is saturated with adsorbate [Pg.260]

dr/dtl+ varies linearly with d9/dll+. This definition of 0 holds for molecules that do not change their conformation when they adsorb. This is the case for small, rigid molecules. Polymers, including proteins, may show adsorption-induced conformational changes. The relation between T and 0 then usually is more intricate this is discussed in Section 15.1. [Pg.260]

The value of is lowered by any repulsive barrier to attachment. The origin of such a barrier might be electrostatic repulsion, solvation effects, or it could be that the residence time at the sorbent surface for a fraction of the molecules is too short for attachment. Because the repulsive barrier may be affected by the degree of coverage of the surface by the adsorbate, k may vary with 9 and, hence, with time. [Pg.260]


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