Time-dependent friction on a charged tracer in a Brownian multicomponent plasma

León, G. Cruz de; Medina‐Noyola, Magdaleno; Alarcón-Waess, O.; Ruiz-Estrada, H.

doi:10.1016/0009-2614(93)89003-z

Cited by 23 publications

(6 citation statements)

References 17 publications

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“…However, no systematic investigation of semiflexible polymer diffusion over the whole range of ionic strengths has been conducted. For charged colloidal spheres, the diffusion constant is known to exhibit a shallow minimum at intermediate salt concentrations where the screening length κ −1 is of the order of the sphere radius R. This was shown in experiments [8] and theoretically with [9,10] and without hydrodynamic interactions [11,12]. Rod-like particles show similar effects, as demonstrated experimentally with tobacco mosaic viruses [13] and in model calculations for ellipsoidal particles [14].…”

supporting

confidence: 54%

Diffusion of a single semiflexible charged polymer

Schlagberger¹,

Bayer²,

Rädler³

et al. 2006

Europhys. Lett.

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The diffusion of charged semiflexible polymers is studied by hydrodynamic simulations. The salt-dependent diffusion constant exhibits a shallow minimum at a screening length comparable to the polymer length. Fluorescence correlation spectroscopy data for 394 bp ds-DNA fragments confirm the relative insensitivity of diffusion over a wide range of salt concentrations. A scaling expression for the diffusion constant of a neutral semiflexible chain encompassing the rod, the intermediate ideal and the asymptotic swollen regime is constructed.

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supporting

confidence: 54%

Diffusion of a single semiflexible charged polymer

Schlagberger¹,

Bayer²,

Rädler³

et al. 2006

Europhys. Lett.

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“…The friction effect of the solvent is included already in ζ 0 T . Our finding that HI are essential for a consistent physical description of electrolyte friction should be compared with earlier approaches of Schurr [20] and Medina-Noyola et al [19,21], the latter approach based on a generalised Langevin equation description, where it has been attempted to explain the observed maximum of ∆ζ T (κ) in terms of direct forces only.…”

mentioning

confidence: 82%

The role of hydrodynamic interactions in colloidal electrolyte friction and sedimentation

Kollmann

Nägele

2000

Europhys. Lett.

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Based on a recently formulated mode coupling scheme for Brownian systems, new analytical expressions are derived for the time-resolved tracer-diffusion, electrolyte friction coefficient and sedimentation velocity of a colloidal macroion suspended in a many-component electrolyte solution. Use of these expressions yields good agreement with experimental data and Booth's theory of macroion sedimentation. Our theoretical expressions allow for a separate assessment of the influence of hydrodynamic and potential forces on the relaxation of the electrolyte atmosphere. Inclusion of hydrodynamic interactions (HI) effects is shown to be essential for a proper description of colloidal electrolyte friction and sedimentation.

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“…Therefore, it could also be used to address dynamical questions in equilibrium and nonequilibrium. Important examples concern the motion of poly-and counterions under the influence of an external electric field including effects as the electrophoretic mobility [46][47][48][49], ion migration [50], electro-kinetic properties [51] and electrolyte friction [52,53]. Our approach produces both diffusive motion and hydrodynamic interactions mediated by the solvent as an output.…”

Section: Discussionmentioning

confidence: 99%

Influence of solvent granularity on the effective interaction between charged colloidal suspensions

Allahyarov

Löwen

2001

Phys. Rev. E

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We study the effect of solvent granularity on the effective force between two charged colloidal particles by computer simulations of the primitive model of strongly asymmetric electrolytes with an explicitly added hard sphere solvent. Apart from molecular oscillating forces for nearly touching colloids which arise from solvent and counterion layering, the counterions are attracted towards the colloidal surfaces by solvent depletion providing a simple statistical description of hydration. This, in turn, has an important influence on the effective forces for larger distances which are considerably reduced as compared to the prediction based on the primitive model. When these forces are repulsive, the long-distance behaviour can be described by an effective Yukawa pair potential with a solvent-renormalized charge. As a function of colloidal volume fraction and added salt concentration, this solvent-renormalized charge behaves qualitatively similar to that obtained via the Poisson-Boltzmann cell model but there are quantitative differences. For divalent counterions and nano-sized colloids, on the other hand, the hydration may lead to overscreened colloids with mutual attraction while the primitive model yields repulsive forces. All these new effects can be accounted for through a solvent-averaged primitive model (SPM) which is obtained from the full model by integrating out the solvent degrees of freedom. The SPM was used to access larger colloidal particles without simulating the solvent explicitly.

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Time-dependent friction on a charged tracer in a Brownian multicomponent plasma

Cited by 23 publications

References 17 publications

Diffusion of a single semiflexible charged polymer

Diffusion of a single semiflexible charged polymer

The role of hydrodynamic interactions in colloidal electrolyte friction and sedimentation

Influence of solvent granularity on the effective interaction between charged colloidal suspensions

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