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Scaling Laws of Polyelectrolyte Adsorption Itamar Borukhov and David Andelman*
 

Summary: Scaling Laws of Polyelectrolyte Adsorption
Itamar Borukhov and David Andelman*
School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences,
Tel-Aviv University, Ramat-Aviv 69978, Tel-Aviv, Israel
Henri Orland
Service de Physique The´orique, CE-Saclay, 91191 Gif-sur-Yvette Cedex, France
Received May 27, 1997; Revised Manuscript Received October 28, 1997
ABSTRACT: Adsorption of charged polymers (polyelectrolytes) from a semidilute solution to a charged
surface is investigated theoretically. We obtain simple scaling laws for (i) the amount of polymer
adsorbed to the surface and (ii) the width D of the adsorbed layer, as a function of the fractional charge
per monomer p and the salt concentration cb. For strongly charged polyelectrolytes (p j 1) in a low-salt
solution, both and D scale as p-1/2
. In high-salt solutions D cb
1/2
/p whereas the scaling behavior of
depends on the strength of the polymer charge. For weak polyelectrolytes (p , 1) we find that
p/cb
1/2
, and for strong polyelectrolytes cb
1/2

  

Source: Andelman, David - School of Physics and Astronomy, Tel Aviv University

 

Collections: Materials Science; Physics