Adsorption of a Polyampholyte Chain on a Charged Surface | Zendy

Andrey V. Dobrynin | Zendy; Michael Rubinstein | Zendy; JeanFrançois Joanny | Zendy

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Adsorption of a Polyampholyte Chain on a Charged Surface

Author(s) -

Andrey V. Dobrynin,

Michael Rubinstein,

JeanFrançois Joanny

Publication year - 1997

Publication title -

macromolecules

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.994

H-Index - 313

eISSN - 1520-5835

pISSN - 0024-9297

DOI - 10.1021/ma9703057

Subject(s) - adsorption , chemistry , charge density , surface charge , dipole , electrostatics , charge (physics) , chemical physics , degree of polymerization , polarization (electrochemistry) , polymerization , polymer , organic chemistry , physics , quantum mechanics

X ABSTRACT: We discuss the adsorption of a single polyampholyte chain with degree of polymerization N carrying Nf charges, (Nf+ positive and Nf- negative charges) on a charged surface with Û charges per unit area. The adsorption is due to the electrostatic polarization of the polyampholyte chain, which acquires a dipole moment in the surface electric field. Symmetric Gaussian polyampholytes with equal numbers of positive and negative charges adsorb if the surface charge density Û is larger than (1/alBN)‚ (1/f 1/2 )( l Bis the Bjerrum length and a is the bond size). Polyampholyte chains carrying a charge of the same sign as the surface can also adsorb if the surface charge is large enough. For a typical asymmetry jf- - f+j ( f / N )1/2, the adsorption threshold is Û > (1/alBN3/4)(1/f 1/4). The effect of the added salt on the adsorption is considered. Finally, we determine the adsorption threshold of a collapsed polyampholyte globule.

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