Polyelectrolytes, adsorption strongly/weakly charged

Strong and Weak Polyelectrolyte Adsorption onto Oppositely Charged Curved. 

Strong and Weak Polyelectrolyte Adsorption onto Oppositely Charged Curved... the equation for the radial dependence ... 

Synthetic polymers are widely applied to modify the surface properties of materials, and their adsorption mechanism is very different from small ions or molecules discussed in previous sections. Moreover, special methods are applied to study polymer adsorption, thus, polymer adsorption became a separate branch of colloid chemistry. Polymers that carry ionizable groups are referred to as polyelectrolytes. Their adsorption behavior is more sensitive to surface charging than adsorption of neutral polymers. Polyelectrolytes are strong or weak electrolytes, and the dissociation degree of weak polyelectrolytes is a function of the pH. The small counterions form a diffuse layer similar to that formed around a micelle of ionic surfactant. 

Blaakmeer J, Bohmer MR, Cohen Stuart MA, Fleer GJ. Adsorption of weak polyelectrolytes on highly charged surfaces. Poly(acrylic acid) on polystyrene latex with strong cationic groups. Macromolecules 1990 23 2301-2309. 

The majority of LbL systems employ oppositely charged polyelectrolytes for the adsorption of polymer layers driven by electrostatic forces (Fig. 1). The assembly relies on the sequential reversal of charge upon the adsorption of oppositely charged polyelectrolytes. Polyelectrolytes may be classified as either strong or weak, with the former maintaining its charge independent of the pH, while the latter exhibits pH-dependent charge due to the presence of ionizable moieties. One of the most... 

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