Sedimentation of Concentrated Spherical Particles with a Charge-Regulated Surface

Lee, Eric; Tong, Tsai-Shih; Chih, Ming-Hui; Hsu, Jyh‐Ping

doi:10.1006/jcis.2002.8393

Cited by 6 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Constant surface potential and constant surface charge models would correspond, respectively, to the cases when the dissociation reactions of the functional groups are infinitely fast and infinitely slow [44]. Also, some authors have derived an hybrid surface charge model to account for the electrical state of the particles [45], which is a generalization of the conventional constant surface potential and constant surface-charged density models. Our model can be modified to include charge regulation mechanisms at the particle surface.…”

Section: B Finite Size Of the Ionsmentioning

confidence: 99%

Ion size effects on the electric double layer of a spherical particle in a realistic salt-free concentrated suspension

Roa

Carrique

2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

A new modified Poisson-Boltzmann equation accounting for the finite size of the ions valid for realistic salt-free concentrated suspensions has been derived, extending the formalism developed for pure salt-free suspensions [Roa et al., Phys. Chem. Chem. Phys., 2011, 13, 3960-3968] to real experimental conditions. These realistic suspensions include water dissociation ions and those generated by atmospheric carbon dioxide contamination, in addition to the added counterions released by the particles to the solution. The electric potential at the particle surface will be calculated for different ion sizes and compared with classical Poisson-Boltzmann predictions for point-like ions, as a function of particle charge and volume fraction. The realistic predictions turn out to be essential to achieve a closer picture of real salt-free suspensions, and even more important when ionic size effects are incorporated to the electric double layer description. We think that both corrections have to be taken into account when developing new realistic electrokinetic models, and surely will help in the comparison with experiments for low-salt or realistic salt-free systems.

show abstract

Section: B Finite Size Of the Ionsmentioning

confidence: 99%

Ion size effects on the electric double layer of a spherical particle in a realistic salt-free concentrated suspension

Roa

Carrique

2011

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…A number of studies [21][22][23][24] of sedimentation under both electrostatic and hydrodynamic particle-particle interactions have been performed using cellular methods to obtain the hydrodynamic component, either with the free-surface boundary condition by Happel [25] or the zero vorticity condition by Kuwabara [26]. While experimental results confirm the cell models as adequate to calculate the sedimentation potential [27], both the method by Happel and that of Kuwabara fail to correctly reproduce the sedimentation behaviour of non-interacting particles in the dilute limit found by Batchelor about 14 years after the introduction of the method [9,25,26].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic simulations of sedimenting dilute particle suspensions under repulsive DLVO interactions

Jung¹,

Uttinger²,

Peukert³

et al. 2022

Soft Matter

View full text Add to dashboard Cite

show abstract

“…In addition, the shape of a polyelectrolyte is capable of influencing its behavior through affecting the amount of counterions attracted into its interior. Adopting a cell model, Lee et al 17 analyzed the sedimentation of a concentrated dispersion of charge-regulated colloidal particles focusing on the effects of the density of the dissociable functional groups on the particle surface, the degree of their dissociation, and the volume fraction of the particle.…”

Section: ■ Introductionmentioning

confidence: 99%

Sedimentation of a pH-Regulated Nanoparticle in a Generalized Gravitational Field

2017

Self Cite

View full text Add to dashboard Cite

Taking account of the effect of double-layer polarization, we modeled the sedimentation of a pH-regulated nanoparticle in a generalized field. The influences of the radius and the density of the functional groups of the particle, the pH, and the bulk salt concentration of the liquid phase and the Reynolds number Re on the sedimentation behavior of the particle are examined in detail. We found that as Re increases, because more counterions are dragged away from the particle surface, its averaged charge density decreases accordingly. The smaller the particle, the thicker the double layer so that double-layer polarization is more significant and the distribution of the surface charge density is more nonuniform. Interestingly, the smaller the particle, the higher the averaged surface charge density, but the smaller the electric force acting on it. If the particle is sufficiently large (300 nm in radius), its averaged surface charge density is insensitive to Re as it varies from 0.0025 to 0.04 but can have an appreciable difference (ca. 10%) if it is small (75 nm).

show abstract

Sedimentation of Concentrated Spherical Particles with a Charge-Regulated Surface

Cited by 6 publications

References 22 publications

Ion size effects on the electric double layer of a spherical particle in a realistic salt-free concentrated suspension

Ion size effects on the electric double layer of a spherical particle in a realistic salt-free concentrated suspension

Hydrodynamic simulations of sedimenting dilute particle suspensions under repulsive DLVO interactions

Sedimentation of a pH-Regulated Nanoparticle in a Generalized Gravitational Field

Contact Info

Product

Resources

About