Primitive Model Electrophoresis

Lozada‐Cassou, Marcelo; González‐Tovar, Enrique

doi:10.1006/jcis.2001.7680

Cited by 54 publications

(65 citation statements)

References 63 publications

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“…at 70% ionization of all carboxyl groups), which implies that the mobility does not follow the increase of charge amount but becomes nonmonotonic at a critical surface charge density, as predicted by many theories. [1][2][3][4][5][6][7] The surface potential ψ 0 can be determined experimentally according to pK a -pK 0 ) 0.434eψ 0 (R)/kT (4) where K a and K 0 are the apparent and the intrinsic dissociation constants respectively, e is the electron charge, k is Boltzmann's constant, and T is absolute temperature. K a can be deduced from where pK 0 is obtained by extrapolating pK a to R ) 0.…”

Section: Resultsmentioning

confidence: 99%

“…In the case of low ionic strength, low σ, and negligible counterion size, PME reduces to WOW. 1 While extensive theoretical investigations of the relationship between the electrophoretic mobility and the surface charge density of spheres have been reported, [1][2][3][4][5][6][7] experimental data to confirm e.g. the maximum in µ-σ curves are rare.…”

Section: Introductionmentioning

confidence: 99%

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Carboxylated Ficolls: Preparation, Characterization, and Electrophoretic Behavior of Model Charged Nanospheres

2006

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Carboxylated ficolls were prepared as model spherical colloids of variable charge and size, with radii ranging from 3.0 to 19.3 nm. Capillary electrophoresis (CE), electrophoretic light scattering (ELS), and potentiometric titration were used to determine mobilities as a function of pH, degree of ionization R, and surface potential ψ 0 . Measured mobilities typically display a plateau at high pH, corresponding to high R and ψ 0 , confirming the general nature of this effect for charged spheres, seen also for charged dendrimers and charged latex particles. This result is examined in the context of a discontinuity in mobility predicted by the Wiersema, O'Brien, and White (WOW) theory and a more recent primitive model electrophoresis (PME) theory, in which bound counterions are considered either as point charges or as hard spheres. While no mobility maximum can be determined as expected by these two theories, our data seem more to support Belloni's theoretical expectations on charged polymers and spheres. Here we explain the mobility plateaus in terms of counterions accumulated close to the surface (surface potential-determining ions) or within the shear plane (mobilitydetermining ions).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carboxylated Ficolls: Preparation, Characterization, and Electrophoretic Behavior of Model Charged Nanospheres

2006

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“…By using the HNC/MSA integral equations theory, they observed also the charge inversion (CI) or charge reversal (CR) under certain conditions determined by the particle volume fraction η = (π/6) i ρ i a 3 i with a i being the diameter of the i-species ions, and the Coulomb coupling correlation factor ξ ij = (βq i q j )/( a ij ) with a ij = (a i + a j )/2 and q i the charge of the ions of the species i. In view of that CI or CR are involved in many physical processes such as self-assembling polyelectrolytes layers on a charged substrate [10], reverse mobility experiments [20][21][22][23], anomalous macroion adsorption on a Langmuir film [24], it is thus important to understand the mechanisms of CI, CR, and OC in inhomogeneous electrolytes near a uniformly charged plate as well as in other confined geometries.…”

Section: Introductionmentioning

confidence: 99%

The effects of unequal ionic sizes for an electrolyte in a charged slit

Jiang

Aguilar-Pineda

Antillón

et al. 2006

Journal of Colloid and Interface Science

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“…For instance, the stability of colloidal dispersion depends on the distribution of small ions around the colloid. The electrophoretic mobility of the solution also can be rationalized in terms of the ion distribution [9,10,11,12] and most of the electrochemical reactions occur in this interfacial region [13].…”

Section: Introductionmentioning

confidence: 99%

Incorporation of excluded-volume correlations into Poisson-Boltzmann theory

2005

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We investigate the effect of excluded volume interactions on the electrolyte distribution around a charged macroion. First, we introduce a criterion for determining when hard-core effects should be taken into account beyond standard mean field Poisson-Boltzmann (PB) theory. Next, we demonstrate that several commonly proposed local density functional approaches for excluded volume interactions cannot be used for this purpose. Instead, we employ a non-local excess free energy by using a simple constant weight approach. We compare the ion distribution and osmotic pressure predicted by this theory with Monte Carlo simulations. They agree very well for weakly developed correlations and give the correct layering effect for stronger ones. In all investigated cases our simple weighted density theory yields more realistic results than the standard PB approach, whereas all local density theories do not improve on the PB density profiles but on the contrary, deviate even more from the simulation results.

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Primitive Model Electrophoresis

Cited by 54 publications

References 63 publications

Carboxylated Ficolls: Preparation, Characterization, and Electrophoretic Behavior of Model Charged Nanospheres

Carboxylated Ficolls: Preparation, Characterization, and Electrophoretic Behavior of Model Charged Nanospheres

The effects of unequal ionic sizes for an electrolyte in a charged slit

Incorporation of excluded-volume correlations into Poisson-Boltzmann theory

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