Direct Measurement of Infinitesimal Depletion Force in a Colloid-Polymer Mixture by Laser Radiation Pressure

Ohshima, Yuichi N.; Sakagami, Hiroyuki; Okumoto, Kenji; Tokoyoda, A.; Igarashi, T.; Shintaku, K.; Toride, S.; Sekino, Hideo; Kabuto, K.; Nishio, Izumi

doi:10.1103/physrevlett.78.3963

Cited by 106 publications

(88 citation statements)

References 11 publications

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“…Experiments on the phase behavior 9,10 and structure 11,12 of polymer colloid mixtures also show deviations from the simple AO model 13,14 , as do direct measurements of the depletion potentials [15][16][17] . Theoretical attempts to directly calculate the depletion potentials for interacting polymers include scaling theory 18 , self-consistent field theory 19 , perturbation theory 20,21 , direct simulations 22 , RG theory 23,24 , as well an interesting new "overlap approximation" method 25 .…”

Section: Introductionmentioning

confidence: 99%

Polymer induced depletion potentials in polymer-colloid mixtures

Louis

Bolhuis

Meijer

et al. 2002

The Journal of Chemical Physics

138

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: Introductionmentioning

confidence: 99%

Polymer induced depletion potentials in polymer-colloid mixtures

Louis

Bolhuis

Meijer

et al. 2002

The Journal of Chemical Physics

138

151

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“…26,27 The free energy F 1,hs of immersion of a small particle in a polymer solution in a half space ͑hs͒ bounded by a planar wall can also be obtained by using Eq. ͑1.1͒.…”

Section: Interaction Between a Particle And A Wallmentioning

confidence: 99%

Small mesoscopic particles in dilute and semidilute solutions of nonadsorbing polymers

Eisenriegler

2000

The Journal of Chemical Physics

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Polymer-induced interactions between two small mesoscopic particles of radius R and between a particle and a wall are investigated for dilute or semidilute embedding solutions of long flexible nonadsorbing polymer chains with radius of gyration R g . Asymptotically exact predictions are obtained using a ''small radius expansion,'' to express the interactions in terms of properties of the polymer solution without particles. The nonmonotonic dependence of the second virial coefficient B 2 CC of a dilute suspension of particles on the interchain overlap is discussed in detail. The magnitude of the minimum of B 2 CC /R 3 increases as a power law in R g /R. The exponent and amplitude are quite different from the earlier prediction of an integral-equation approach. For dilute polymers in two dimensions outside two circular disks in contact, exact results are given for the monomer-density depletion profile, the pressure variation along the perimeter of, and the polymer-induced force between the two disks.

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“…For example, in binary hard-sphere mixtures, the larger particles can be attracted to flat, hard walls [5][6][7][8] and the highly charged polyelectrolyte, cytoskeletal filamentous actins and cationic lipid membranes can self-assemble into stacked three-layer tubule networks [9].…”

Section: Introductionmentioning

confidence: 99%

Depletion effect and biomembrane budding

et al. 2013

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Depletion effects are well known to lead to phase separation in microsystems consisting of large and small particles with short-range repulsive interactions that act over macromolecular length scales. The equilibrium mechanics between an enveloped colloidal particle and a biomembrane caused by entropy is investigated by using a continuum model. We show that the favorable contact energy stems from entropy, which is sufficient to drive engulfment of the colloidal particle, and deformation of the biomembrane determines the resistance to the engulfment of the colloidal particle. The engulfment process depends on the ratio of the radii of the larger particle and smaller particles and the bending rigidity. The results show insights into the effects of depletion on biomembrane budding and nanoparticle transportation by a vesicle.

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Direct Measurement of Infinitesimal Depletion Force in a Colloid-Polymer Mixture by Laser Radiation Pressure

Cited by 106 publications

References 11 publications

Polymer induced depletion potentials in polymer-colloid mixtures

Polymer induced depletion potentials in polymer-colloid mixtures

Small mesoscopic particles in dilute and semidilute solutions of nonadsorbing polymers

Depletion effect and biomembrane budding

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