Observation of the Mobility Maximum Predicted by the Standard Electrokinetic Model for Highly Charged Amidine Latex Particles

Borkovec, Michal; Behrens, Sven H.; Semmler, Micha

doi:10.1021/la9916373

Cited by 62 publications

(77 citation statements)

References 21 publications

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“…Some of its conclusions have been already corroborated by new experiments (11,30,33), e.g., the prediction of a reversed mobility. This finding, suggested quite some time ago (34), in relation to overcharging of macroions, is relevant for the understanding of self-assembling materials, gene therapy, and nanostructured films (35,36).…”

Section: Introductionmentioning

confidence: 66%

“…Equations [10], [11], and [14] form our nonequilibrium framework from which the electrophoretic mobility will be extracted. To proceed, this coupled set of differential equations, subject to appropiate boundary conditions, must be integrated to evaluate the hydrodynamical fields: v(r), ρ i (r), and µ i (r).…”

Section: Hydrodynamic Equationsmentioning

confidence: 99%

“…[10], [11], and [14] results in the following linearized equations for δv(r) (or v(r)), δρ i (r), and δµ i (r):…”

Section: Hydrodynamic Equationsmentioning

confidence: 99%

“…At present, WOWT is considered the latest major development of the theory of electrophoresis. Its satisfactory comparison with experiments in the most common situations (i.e., low concentration univalent salts and not too high ζ , σ , and κ A (11)(12)(13)(14)) has fostered WOWT as the usual reference to interpret mobility data. However, there is experimental evidence that suggests possible limitations of WOWT: For instance, sometimes no unequivocal maxima are visible in the µ * -ζ * graphs (12,14,15), or, most frequently, the theoretical values of such maxima exhibit quantitative differences from the measured ones (12,(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25).…”

Section: Introductionmentioning

confidence: 97%

“…The vintage problem of establishing a quantitative relationship between the steadystate electrophoretic mobility, defined by |µ| = |U|/|E 0 |, and the zeta potential was pioneered by Smoluchowsky, Hückel, and Henry (7,8), and was evolved into the classical theory of the electrophoretic motion of a spherical macroion by Wiersema et al (9) and O'Brien and White (10). In all these theories, the employed "standard electrokinetic model" (4,11) is that corresponding to a hard macrosphere of radius R and hydrodyamical radius A, covered by a uniform charge density σ = eZ M /(4πR 2 ), and submerged in a binary point ion model (PIM) electrolyte. e is the protonic charge and Z M is the macroion valence.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Primitive Model Electrophoresis

Lozada‐Cassou

González‐Tovar

2001

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 66%

Section: Hydrodynamic Equationsmentioning

confidence: 99%

“…[10], [11], and [14] results in the following linearized equations for δv(r) (or v(r)), δρ i (r), and δµ i (r):…”

Section: Hydrodynamic Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Primitive Model Electrophoresis

Lozada‐Cassou

González‐Tovar

2001

Journal of Colloid and Interface Science

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Dispersion Characteristics and Aggregation in Titanate Nanowire Colloids

et al. 2014

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Titanate nanowires (TiONWs) are synthesized through the hydrothermal method and characterized in acidic aqueous dispersions by using electrophoresis, dynamic light scattering, and atomic force microscopy. The TiONWs have a rodlike shape with an average length of about 600 nm and a thickness of 35 nm. They are positively charged under the conditions used. Their surface charge properties and aggregation are investigated in the presence of oppositely charged poly(styrene sulfonate) (PSS) polyelectrolyte. Charge neutralization followed by a subsequent charge reversal process is observed, which is attributed to the adsorption of PSS. The colloids are unstable near the charge neutralization point and stable at lower and higher PSS doses, in good qualitative agreement with the theory developed by Derjaguin, Landau, Verwey, and Overbeek (DLVO). The nanowires prefer to align along the walls, leading to “spaghetti‐like” oriented aggregates. The aggregation processes of bare and PSS‐coated TiONWs are monitored at different concentrations of an inert electrolyte; slow aggregation is found at low salt levels, whereas aggregation is rapid beyond the critical coagulation concentration, as predicted by the DLVO theory, which describes the colloid stability of the TiONWs adequately in all the systems investigated. Coating of the nanowires with the polyelectrolyte leads to a critical coagulation concentration 75 times higher than that of the bare titanates, indicating the enormous stabilizing effect of PSS.

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Tuning Colloidal Stability of Layered Double Hydroxides: From Monovalent Ions to Polyelectrolytes

et al. 2016

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The growing number of applications of layered double hydroxide (LDH) colloids demands for detailed understanding of particle aggregation processes in such samples. Tuning the colloidal stability in aqueous suspensions is essential to design stable systems or to induce controlled aggregation of these elongated particles. In this review, recent progress in this field is summarized; in particular, the charging and aggregation of LDHs of various compositions and sizes in the presence of different aggregating agents are discussed. The review focuses on the effect of monovalent salts, multivalent ions, and polyelectrolytes on the suspension stability of LDHs. The provided information will help to better understand the origin of interparticle forces responsible for the colloidal stability and to design highly stable or aggregating LDH colloids according to the desired goals in certain applications. Moreover, potential future research directions to obtain a broader picture of LDH aggregation are also suggested.

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Observation of the Mobility Maximum Predicted by the Standard Electrokinetic Model for Highly Charged Amidine Latex Particles

Cited by 62 publications

References 21 publications

Primitive Model Electrophoresis

Primitive Model Electrophoresis

Dispersion Characteristics and Aggregation in Titanate Nanowire Colloids

Tuning Colloidal Stability of Layered Double Hydroxides: From Monovalent Ions to Polyelectrolytes

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