Polymer adsorption on colloidal particles

Pincus, P.; Sandroff, C. J.; Witten, Thomas A.

doi:10.1051/jphys:01984004504072500

Cited by 94 publications

(92 citation statements)

References 22 publications

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“…Pincus et al 19 and recently by Nguyen and Shklovskii. 16 We restrict our study to highly charged chains for which the Manning parameter b l B ≡ ξ is much larger than one.…”

Section: Complexation Of a Chain And A Single Spherementioning

confidence: 99%

Electrostatic complexation of spheres and chains under elastic stress

Schiessel

Bruinsma

Gelbart

2001

The Journal of Chemical Physics

128

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We consider the complexation of highly charged semiflexible polyelectrolytes with oppositely charged macroions. On the basis of scaling arguments we discuss how the resulting complexes depend on the persistence length of the polyelectrolyte, the salt concentration, and the sizes and charges of the chain and the macroions. We study first the case of complexation with a single sphere and calculate the wrapping length of the chain. We then extend our considerations to complexes involving many wrapped spheres and study cooperative effects. The mechanical properties of such a complex under an external deformation are evaluated.

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“…Pincus et al 19 and recently by Nguyen and Shklovskii. 16 We restrict our study to highly charged chains for which the Manning parameter b l B ≡ ξ is much larger than one.…”

Section: Complexation Of a Chain And A Single Spherementioning

confidence: 99%

Electrostatic complexation of spheres and chains under elastic stress

Schiessel

Bruinsma

Gelbart

2001

The Journal of Chemical Physics

128

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“…The adsorption on macroscopically curved bodies, such as spheres and cylinders, leads to modified adsorption profiles [258]. Of considerable interest is the effective interaction between two colloidal particles covered by adsorption layers [259]. Another application is obtained for the adsorption of polymers on flexible interfaces or membranes [243,260,261].…”

Section: Neutral Polymersmentioning

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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“…The average size of the loops, denoted as D, is a measure for the strength of adsorption: D decreases with increasing adsorption strength [34]. We assume the affinity of the polymer for the particle surface to be large, so that D is significantly smaller than R p , The sum of train and loop segments is the number of polymer segments per complex, N ad .…”

Section: Estimation Of Parametersmentioning

confidence: 99%

Stuffed brushes: theory and experiment

Currie¹,

Gucht²,

Borisov³

et al. 1999

Pure and Applied Chemistry

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Abstract:The interaction between polymer brushes and mesoscopic particles is investigated both theoretically and experimentally. We present an analytical mean-field theory for a polymer brush (a layer of long polymer chains end-grafted to a substrate) with varying excluded volume interactions between monomer units. This system mimics the reversible adsorption of mesoscopic particles, such as surfactant micelles or proteins, on the grafted chains. The equilibrium structural properties of the brush (the brush thickness and overall degree of complexation) as well as the number of adsorbed particles per unit area, ⌫, are analysed as functions of the affinity between particle and chain, grafting density and excluded volume interactions. In our model ⌫ is found to have a maximum as a function of . Experimentally the adsorption of BSA on a hydrophobic substrate with grafted PEO chains is measured with reflectometry. In the case of short grafted chains the adsorbed amount of BSA, ⌫, decreases continuously with increasing , which agrees with previous results and model calculations in the literature. In the case of long PEO chains, however, ⌫ is found to have a maximum as a function of . Qualitatively the experimental dependence of ⌫ on is found to agree with the results of our mean-field model. PEO chains show no affinity for BSA in the bulk, whereas in a grafted conformation an effective attraction is found. Some comments are made on the nature of this affinity, which is not yet fully understood.

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Polymer adsorption on colloidal particles

Cited by 94 publications

References 22 publications

Electrostatic complexation of spheres and chains under elastic stress

Electrostatic complexation of spheres and chains under elastic stress

Neutral and charged polymers at interfaces

Stuffed brushes: theory and experiment

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