Effective force between colloidal particles with end-grafted long polymer chains dissolved in a high-molecular weight solvent

Himmi, M.; Benhamou, M.; Bettachy, A.

doi:10.1016/j.molliq.2004.01.002

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…1 Due to fundamental importance, the effective forces for different systems have been worked out in details via experiments, theoretical studies, and computer simulations in various systems. [1][2][3][4][5][6][7][8][9] The medium generated forces on the dispersed particles arise from the free energy cost of distributing the dispersing particles around them. In a homogeneous liquid of uniform density, the distribution of the medium particles around the dispersed particles does not depend on the position of the latter.…”

Section: Introductionmentioning

confidence: 99%

Cross-over between central and non-central conservative effective forces in a modulated colloidal fluid

Chaudhuri¹,

Chakrabarty²,

Chakrabarti

2013

The Journal of Chemical Physics

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We study by Monte Carlo simulations the effective forces between two particles dispersed in a two-dimensional colloidal fluid, modulated in one direction by a spatially periodic external potential. When the modulation strength exceeds the strength of interaction between the dispersed and dispersing particles, the anisotropic effective forces, show cross-over between central and non-central nature, although the effective forces remain conservative. The non-central nature of the effective forces depends on the orientation of the separation vector between the dispersed particles with respect to the modulation direction.

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Section: Introductionmentioning

confidence: 99%

Cross-over between central and non-central conservative effective forces in a modulated colloidal fluid

Chaudhuri¹,

Chakrabarty²,

Chakrabarti

2013

The Journal of Chemical Physics

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Extensive Study of Interaction Force Between Spherical Colloids and Star Polymers

Himmi

Mohammadi

2012

Int. J. Mod. Phys. B

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We consider a system consisting of very small colloidal particles clothed each by f end-grafted flexible polymer chains we regarded as star polymers, and hard spherical colloidal particles in a good solvent. Our main objective is to determine the expression of the interaction force between a spherical colloid and a star polymer as a function of distance between them. We limit ourselves to the case where the star polymer is smaller than the colloid. In the first part, the system is dissolved in a melt of short linear chains of polymerization degree P<N, where N denotes the polymerization degree of grafted chains. To compute the expected force, we consider two regimes: (1) high-grafting density [Formula: see text] and (2) small-grafting density (f < f*). For (f > f*), we show that the expression of the expected force coincides exactly with that of the case of a small molecular weight solvent. For (f < f*), we show that there is a change in behavior. In the second part, we assume that the lengths of the f grafted chains were randomly distributed and there is talk of a polydisperse star polymer. We show that the computation of the expected force depends on the relative values of the polymerization degree of longest grafted chain, N, when it is compared to the typical one Nc ~ f1/(α-1). Here α is the polydispersity exponent. We distinguish two regimes depending on whether N < Nc or N > Nc. For the regime with N < Nc, and comparing the expression of the force obtained for the monodisperse case, we can say that the polydispersity of grafted chains induce a drastic change of the force expression. For the regime with N > Nc, we found the existence of two distance-ranges. For small distances, the effective force expression is identical to that relative to the above case (N < Nc). But for high distances, the effective force expression is similar to the monodisperse case.

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Effective force between colloidal particles with end-grafted long polymer chains dissolved in a high-molecular weight solvent

Cited by 2 publications

References 14 publications

Cross-over between central and non-central conservative effective forces in a modulated colloidal fluid

Cross-over between central and non-central conservative effective forces in a modulated colloidal fluid

Extensive Study of Interaction Force Between Spherical Colloids and Star Polymers

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