Comparison of colloidal effective charges from different experiments

Wette, Patrick; Schöpe, Hans Joachim; Palberg, Thomas

doi:10.1063/1.1480010

Cited by 87 publications

(115 citation statements)

References 41 publications

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“…However, the effective charge is a difficult quantity to measure directly in an experiment (see however the work reported in [24] confirming the scaling Z sat ∝ a/ℓ B for low ionic strength suspensions of spherical latex colloids). In order to assess the experimental relevance of the above ideas, we now turn to the computation of osmotic properties for spherical and rod-like macro-ions, easily accessible both experimentally and within our approach.…”

Section: Confrontation To Experimental and Numerical Resultsmentioning

confidence: 99%

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Effective charge saturation in colloidal suspensions

Bocquet

Trizac

Aubouy

2002

The Journal of Chemical Physics

141

182

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Because micro-ions accumulate around highly charged colloidal particles in electrolyte solutions, the relevant parameter to compute their interactions is not the bare charge, but an effective (or renormalized) quantity, whose value is sensitive to the geometry of the colloid, the temperature or the presence of added-salt. This non-linear screening effect is a central feature in the field of colloidal suspensions or polyelectrolyte solutions. We propose a simple method to predict effective charges of highly charged macro-ions, that is reliable for mono-valent electrolytes (and counter-ions) in the colloidal limit (large size compared to both screening length and Bjerrum length). Taking reference to the non linear Poisson-Boltzmann theory, the method is successfully tested against the geometry of the macro-ions, the possible confinement in a Wigner-Seitz cell, and the presence of added salt. Moreover, our results are corroborated by various experimental measures reported in the literature. This approach provides a useful route to incorporate the non-linear effects of charge renormalization within a linear theory for systems where electrostatic interactions play an important role.

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Section: Confrontation To Experimental and Numerical Resultsmentioning

confidence: 99%

“…In de-ionized solutions, this argument leads to the scaling Z sat eff ∝ a/ℓ B , which has been recently tested for various latex colloids [24].…”

Section: A Planar Casementioning

confidence: 99%

Effective charge saturation in colloidal suspensions

Bocquet

Trizac

Aubouy

2002

The Journal of Chemical Physics

141

182

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“…Recently, a comparison between the static and dynamic effective charges calculated from crystal shear moduli and suspension conductivity, respectively, was done. 23 The dynamic effective charge was found to be 40% larger than the static one for several sets of silica and latex particles in law-salt conditions. We expect that our system without added salt shows similar features as the hydrodynamic coupling of the ions to the particle is a very short-range effect.…”

Section: Resultsmentioning

confidence: 99%

Electrophoretic mobility of a charged colloidal particle: a computer simulation study

Lobaskin¹,

Dünweg

Holm

2004

J. Phys.: Condens. Matter

105

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Abstract. We study the mobility of a charged colloidal particle in a constant homogeneous electric field by means of computer simulations. The simulation method combines a lattice Boltzmann scheme for the fluid with standard Langevin dynamics for the colloidal particle, which is built up from a net of bonded particles forming the surface of the colloid. The coupling between the two subsystems is introduced via friction forces. In addition explicit counterions, also coupled to the fluid, are present. We observe a non-monotonous dependence of the electrophoretic mobility on the bare colloidal charge. At low surface charge density we observe a linear increase of the mobility with bare charge, whereas at higher charges, where more than half of the ions are co-moving with the colloid, the mobility decreases with increasing bare charge.

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“…During the last decades, a number of studies have focused on the phenomenon of counterion condensation, both experimental [31,32] and theoretical, and by simulations [33,34].…”

Section: Introductionmentioning

confidence: 99%

Does Electrical Conductivity of Linear Polyelectrolytes in Aqueous Solutions Follow the Dynamic Scaling Laws? A Critical Review and a Summary of the Key Relations

Cametti

2014

Polymers

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Abstract:In this review, we focus on the electrical conductivity of aqueous polyelectrolyte solutions in the light of the dynamic scaling laws, recently proposed by Dobrynin and Rubinstein, to take into account the polymer conformations in different concentration regimes, both in good and poor solvent conditions. This approach allows us to separate contributions due to polymer conformation from those due to the ionic character of the chain, and offers the possibility to extend the validity of the Manning conductivity model to dilute and semidilute regimes. The electrical conductivity in the light of the scaling approach compares reasonably well with the observed values for different polyelectrolytes in aqueous solutions, over an extended concentration range, from the dilute to the semidilute regime.

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Comparison of colloidal effective charges from different experiments

Cited by 87 publications

References 41 publications

Effective charge saturation in colloidal suspensions

Effective charge saturation in colloidal suspensions

Electrophoretic mobility of a charged colloidal particle: a computer simulation study

Does Electrical Conductivity of Linear Polyelectrolytes in Aqueous Solutions Follow the Dynamic Scaling Laws? A Critical Review and a Summary of the Key Relations

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