Excluded-volume polymer-induced depletion interaction between parallel flat plates

Tuinier, Remco; Lekkerkerker, H.N.W.

doi:10.1007/s101890170013

Cited by 18 publications

(36 citation statements)

References 30 publications

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“…These results are also compared to direct computer simulations of L = 100 SAW polymers 38,39 . Even though the L = 100 simulations have not quite reached the scaling limit, the well-depths at contact are remarkably well reproduced, a result also found by Tuinier and Lekkerkerker 25 with a similar theory. 9), while the dot-dashed line shows the naive improvement obtained by substituting the true polymer osmotic pressure for the ideal polymer pressure.…”

Section: Depletion Potential Between Two Wallssupporting

confidence: 79%

Polymer induced depletion potentials in polymer-colloid mixtures

Louis

Bolhuis

Meijer

et al. 2002

The Journal of Chemical Physics

137

151

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The depletion interactions between two colloidal plates or between two colloidal spheres, induced by interacting polymers in a good solvent, are calculated theoretically and by computer simulations. A simple analytical theory is shown to be quantitatively accurate for case of two plates. A related depletion potential is derived for two spheres; it also agrees very well with direct computer simulations. Theories based on ideal polymers show important deviations with increasing polymer concentration: They overestimate the range of the depletion potential between two plates or two spheres at all densities, with the largest relative change occurring in the dilute regime. They underestimate the well depth at contact for the case of two plates, but overestimate it for two spheres. Depletion potentials are also calculated using a coarse graining approach which represents the polymers as "soft colloids": good agreement is found in the dilute regime. Finally, the effect of the polymers on colloid-colloid osmotic virial coefficients is related to phase behavior of polymer-colloid mixtures.

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Section: Depletion Potential Between Two Wallssupporting

confidence: 79%

Polymer induced depletion potentials in polymer-colloid mixtures

Louis

Bolhuis

Meijer

et al. 2002

The Journal of Chemical Physics

137

151

View full text Add to dashboard Cite

show abstract

“…If the layer thickness were constant for all polymer concentrations and the osmotic pressure difference linear in concentration, this positive free energy would be P dV, where P continuously passes from P b at the colloid particle surface to zero in the surrounding solution. Since this is not the case, the energy is found by integration over volume and concentration [17]…”

Section: A Depletion Attractionmentioning

confidence: 99%

“…Two analytical treatments have been proposed recently to calculate the correlation length ξ and osmotic pressure P in the semidilute regime. The renormalization group theory [14] yields expressions [17,18] for ξ and P as functions of polymer concentration and molecular weight. A second treatment has been developed by Schweizer and co-workers [10,19], which employs the polymer reference interaction site model (PRISM).…”

Section: Introductionmentioning

confidence: 99%

Polymer-induced bundling ofFactin and the depletion force

Hošek

Tang

2004

Phys. Rev. E

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The inert polymer polyethylene glycol (PEG) induces a "bundling" phenomenon in F actin solutions when its concentration exceeds a critical onset value C(o). Over a limited range of PEG molecular weight and ionic strength, C(o) can be expressed as a function of these two variables. The process is reversible, but hysteresis is also observed in the dissolution of the bundles, with ionic strength having a large influence. Additional actin filaments are able to join the previously formed bundles. PEG polymers are not incorporated into the actin bundles. Estimates of the Asakura-Oosawa depletion force, Coulomb repulsion, and van der Waals potential are combined in order to explain the bundling effect and hysteresis. Conjectures are presented concerning the apparent limit in bundle size.

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“…Depletion forces, polymer crowding, and phase behavior in colloid-polymer mixtures and polymer-nanoparticle composite materials have been probed by a diverse array of experimental methods, including neutron scattering [51][52][53][54][55][56][57][58], atomic force microscopy [59], total internal reflection microscopy [60], optical trapping [61][62][63], and turbidity measurements [64][65][66]. Related modeling approaches have been based on mean-field and scaling theories [5,[67][68][69][70], free-volume theories [71][72][73][74], force-balance theory [75], perturbation theory [76,77], polymer field theory [78][79][80][81][82][83][84], integral-equation theory [85][86][87], densityfunctional theory [88][89][90][91][92], adsorption theory [93][94][95]…”

Section: Introductionmentioning

confidence: 99%

Depletion-induced forces and crowding in polymer-nanoparticle mixtures: Role of polymer shape fluctuations and penetrability

Lim

Denton

2016

The Journal of Chemical Physics

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Depletion forces and macromolecular crowding govern the structure and function of biopolymers in biological cells and the properties of polymer nanocomposite materials. To isolate and analyze the influence of polymer shape fluctuations and penetrability on depletion-induced interactions and crowding by nanoparticles, we model polymers as effective penetrable ellipsoids, whose shapes fluctuate according to the probability distributions of the eigenvalues of the gyration tensor of an ideal random walk. Within this model, we apply Monte Carlo simulation methods to compute the depletion-induced potential of mean force between hard nanospheres and crowding-induced shape distributions of polymers in the protein limit, in which polymer coils can be easily penetrated by smaller nanospheres. By comparing depletion potentials from simulations of ellipsoidal and spherical polymer models with predictions of polymer field theory and free-volume theory, we show that polymer depletion-induced interactions and crowding depend sensitively on polymer shapes and penetrability, with important implications for bulk thermodynamic phase behavior.

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Excluded-volume polymer-induced depletion interaction between parallel flat plates

Cited by 18 publications

References 30 publications

Polymer induced depletion potentials in polymer-colloid mixtures

Polymer induced depletion potentials in polymer-colloid mixtures

Polymer-induced bundling ofFactin and the depletion force

Depletion-induced forces and crowding in polymer-nanoparticle mixtures: Role of polymer shape fluctuations and penetrability

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