Conformation of weakly charged polyelectrolytes at a solid–liquid interface

Varoqui, R.; Johner, A.; Elaı̈ssari, A.

doi:10.1063/1.460267

Cited by 46 publications

(68 citation statements)

References 19 publications

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“…The electrostatic potential is determined self-consistently (meanfield theory) together with the concentration profiles of the polymer and the small ions. In another approach, the electrostatic potential and the PE concentration are treated as continuous functions [155,191,201,202,203,204,205,206]. These quantities are obtained from two coupled differential equations derived from the total free energy of the system.…”

Section: Adsorption Of Polyelectrolytes -Mean Fieldmentioning

confidence: 99%

Neutral and charged polymers at interfaces

2003

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Chain-like macromolecules (polymers) show characteristic adsorption properties due to their flexibility and internal degrees of freedom, when attracted to surfaces and interfaces. In this review we discuss concepts and features that are relevant to the adsorption of neutral and charged polymers at equilibrium, including the type of polymer/surface interaction, the solvent quality, the characteristics of the surface, and the polymer structure. We pay special attention to the case of charged polymers (polyelectrolytes) that have a special importance due to their water solubility. We present a summary of recent progress in this rapidly evolving field. Because many experimental studies are performed with rather stiff biopolymers, we discuss in detail the case of semi-flexible polymers in addition to flexible ones. We first review the behavior of neutral and charged chains in solution. Then, the adsorption of a single polymer chain is considered. Next, the adsorption and depletion processes in the many-chain case are reviewed. Profiles, changes in the surface tension and polymer surface excess are presented. Mean-field and corrections due to fluctuations and lateral correlations are discussed. The force of interaction between two adsorbed layers, which is important in understanding colloidal stability, is characterized. The behavior of grafted polymers is also reviewed, both for neutral and charged polymer brushes.

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Section: Adsorption Of Polyelectrolytes -Mean Fieldmentioning

confidence: 99%

Neutral and charged polymers at interfaces

2003

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“…Using a self-consistent field theory, Varoqui et al [46] calculated the segment density profile of polyelectrolyte molecules adsorbed on one plate and Podgornik [9] extended the procedure to the interaction between two plates.…”

Section: Introductionmentioning

confidence: 99%

The bridging force between two plates by polyelectrolyte chains

Huang

Ruckenstein

2004

Advances in Colloid and Interface Science

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“…The relation between the polymer order parameter and the monomer concentration is analogous to the relation between the wave function and the probability density of a particle in quantum mechanics. The excess free energy with respect to the bulk can be divided into three contributions [22][23][24][25]:…”

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confidence: 99%

Effect of Polyelectrolyte Adsorption on Intercolloidal Forces

1999

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The behavior of polyelectrolytes between charged surfaces immersed in semi-dilute solutions is investigated theoretically. A continuum mean field approach is used for calculating numerically concentration profiles between two electrodes held at a constant potential. A generalized contact theorem relates the inter-surface forces to the concentration profiles. The numerical results show that over-compensation of the surface charges by adsorbing polyelectrolytes can lead to effective attraction between equally charged surfaces. Simple scaling arguments enable us to characterize qualitatively the inter-surface interactions as function of the fraction of charged monomers p and the salt concentration c b . In the low salt regime we find strong repulsion at short distances, where the polymers are depleted from the inter-surface gap, followed by strong attraction when the two adsorbed layers overlap. The magnitude of this attraction scales as p 1/2 and its dominant length scale is proportional to a/p 1/2 , where a is the monomer size. At larger distances the two adsorbing surfaces interact via a weak electrostatic repulsion. For strong polyelectrolytes at high salt concentration the polymer contribution to attraction at short distances scales as p/c 1/2 b and the length scale is proportional to κsa 2 /p, where κ −1 s is the Debye-Hückel screening length. For weak polyelectrolytes at high salt concentration the interaction is repulsive for all surface separations and decays exponentially with a decay length equal to κ −1 s . The effect of irreversible adsorption is discussed as well and it is shown that inter-surface attraction can be obtained in this case as well. 61.25.H, 68.10, 36.20, 41.10D

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Conformation of weakly charged polyelectrolytes at a solid–liquid interface

Cited by 46 publications

References 19 publications

Neutral and charged polymers at interfaces

Neutral and charged polymers at interfaces

The bridging force between two plates by polyelectrolyte chains

Effect of Polyelectrolyte Adsorption on Intercolloidal Forces

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