Nonlinear effects in the electrophoresis of a spherical colloidal particle

Lozada‐Cassou, Marcelo; González‐Tovar, Enrique; Olivares, Wilmer

doi:10.1103/physreve.60.r17

Cited by 78 publications

(107 citation statements)

References 21 publications

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“…This mobility reversal has been experimentally observed [27,28,29,30]. This effect has been taken into account in the electrophoresis theory by Lozada-Cassou et al [31]. An excellent qualitative agreement with experimental results [20,28,30] is found.…”

Section: Introductionsupporting

confidence: 77%

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Overcharging of DNA in the Presence of Salt: Theory and Simulation

et al. 2001

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A study of a model rod-like polyelectrolyte molecule immersed into a monovalent or divalent electrolyte is presented. Results for the local concentration profile, mean electrostatic potential, charge distribution function and ζ−potential are obtained from hypernetted-chain/mean spherical approximation (HNC/MSA) theory and compared with molecular dynamics (MD) simulations. As a particular case, the parameters of the polyelectrolyte molecule are mapped to those of a DNA molecule. Both, HNC/MSA and MD, predict the occurrence of overcharging, which is not present in the Poisson-Boltzmann theory. Futher an excellent qualitative, and in some cases quantitative, agreement between HNC/MSA and MD is found. Oscillations observed in the mean electrostatic potential, local concentration profiles, as well as the curvature of the ζ-potential are discussed in terms of the observed overcharging effect. Particularly interesting results are a very non-monotonic behavior of the ζ-potential, as a function of the rod charge density, and the overcharging by monovalent counterions.

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Section: Introductionsupporting

confidence: 77%

“…which can be identified with the zeta-potential of electrophoresis and which is of importance in the computation of electrophoretic mobilities [31,46]. In the PB theory for a charged rod immersed into an ionic solution, and its linearized version, ζ depends monotonically on ξ [18].…”

Section: Resultsmentioning

confidence: 99%

Overcharging of DNA in the Presence of Salt: Theory and Simulation

et al. 2001

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“…A very spectacular effect which has attracted great attention these last years is the phenomenon of overcharging [1][2][3][4][5][6][7][8]. This situation occurs when the number of counterions in the vicinity of the macroion surface is so high that the macro-particle bare charge is overcompensated (charge inversion).…”

Section: Introductionmentioning

confidence: 99%

Charge inversion in colloidal systems

Messina

Holm

Kremer

2002

Computer Physics Communications

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We investigate spherical macroions in the strong Coulomb coupling regime within the primitive model in salt-free environment. Molecular dynamics (MD) simulations are used to elucidate the effect of discrete macroion charge distribution on charge inversion. A systematic comparison is made with the charge inversion obtained in the conventional continuous charge distribution. Furthermore the effect of multivalent counterions is reported.

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“…More recently, it also attracted a significant attention of physicists [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. Charge inversion is now understood to be the generic phenomenon that occurs in strongly correlated charged systems.…”

Section: Introductionmentioning

confidence: 99%

Effects of asymmetric salt and a cylindrical macroion on charge inversion: Electrophoresis by molecular dynamics simulations

Tanaka

2003

Phys. Rev. E

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The charge inversion phenomenon is studied by molecular dynamics simulations, focusing on size and valence asymmetric salts, and a threshold of surface charge density for charge inversion. The charge inversion criteria by the electrophoretic mobility and the radial distribution functions of ions coincide except around the charge inversion threshold. The reversed electrophoretic mobility increases with the ratio of coion to counterion radii a − /a + , while it decreases with the ratio of coion to counterion valences Z − /Z + . The monovalent salt enhances charge inversion of a strongly charged macroion at small salt ionic strength, while it reduces reversed mobility otherwise. A cylindrical macroion is more persistent to monovalent salt than a spherical macroion of the same radius and surface charge density.

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Nonlinear effects in the electrophoresis of a spherical colloidal particle

Cited by 78 publications

References 21 publications

Overcharging of DNA in the Presence of Salt: Theory and Simulation

Overcharging of DNA in the Presence of Salt: Theory and Simulation

Charge inversion in colloidal systems

Effects of asymmetric salt and a cylindrical macroion on charge inversion: Electrophoresis by molecular dynamics simulations

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