The mechanical stability of colloidal dispersions

Stamberger, Paul

doi:10.1016/0095-8522(62)90005-3

Cited by 18 publications

(3 citation statements)

References 7 publications

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“…Therefore, at higher ionic strength (κ –1 = 2.2–1.3 nm), higher shear is required for primary minimum coagulation to take place; therefore, no reversal in the trend is observed. None of the previous works , on stability analysis have observed this trend reversal, probably because they did not involve low ionic strength calculations (κ –1 > 20 nm). Furthermore, the work of Melik and Fogler , on gravity-induced settling did not report the effect of particle size on stability.…”

Section: Resultsmentioning

confidence: 83%

“…Similarly, Zaccone et al studied the effects of surfactant adsorption and association on the colloidal stability with a light-scattering study. Though flow-induced coagulation has been experimentally investigated by many researchers, − theoretical investigation did not receive much attention in comparison to Brownian coagulation . van de Van and Mason were the first to study the stability of a colloidal dispersion by considering the behavior of two equally sized spheres in a simple shear flow.…”

Section: Introductionmentioning

confidence: 99%

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Stability Characteristics of Nanoparticles in a Laminar Linear Shear Flow in the Presence of DLVO and Non-DLVO Forces

Bal

2019

Langmuir

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Stability characteristics of colloids in a laminar flow have been studied by solving the Fokker−Plank equation for the pair probability density function. This was done by simultaneously incorporating, for the first time, the effects of (i) Brownian motion, (ii) fluid convection, (iii) the van der Waals force, and (iv) double-layer repulsion. Furthermore, this work, for the first time, studies the effects of solvation and steric repulsion on a colloid's stability. This work interestingly finds that the stability of colloids initially increases with an increase in particle size followed by a decrease. In contrast to that, stability is observed to increase in an accelerating manner with an increase in surface potential. Similarly, it is found that stability shows a relatively stronger dependence on the solvation potential pre-exponential coefficient as compared to that found with the solvation potential decay length or surface potential. In the case of the coating thickness, though stability shows increasing behavior, the rate of increase is decelerating. The coating density is found to be the single most important parameter in controlling stability as observed by even higher selfaccelerating rate of increase of stability as compared to that observed with particle size or the surface or solvation potential. Importantly, analysis reveals that stability to secondary minimum coagulation is not affected by either solvation or steric potential.

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Section: Resultsmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Stability Characteristics of Nanoparticles in a Laminar Linear Shear Flow in the Presence of DLVO and Non-DLVO Forces

Bal

2019

Langmuir

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“…Also, the particles appear to deposit in patches both in the grooves and on the fins on the twisted fiber, whereas on the structured fiber and the round fiber (images not shown here) the particles appear more randomly distributed over the whole surface. This aggregation can be due to the shear induced by secondary flows due to the twist [40][41][42]. It can also explain the better reversibility of fouling for the twisted fibers observed during the flux-cycling experiments, as clusters of particles are more easily swept away by the cross-flow as compared to individual particle deposits [27,43].…”

Section: Direct Visual Observation Of Yeast Depositionmentioning

confidence: 96%

Fouling behavior of microstructured hollow fibers in cross-flow filtrations: Critical flux determination and direct visual observation of particle deposition

Culfaz

Haddad

Weßling

et al. 2011

Journal of Membrane Science

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Use of trajectory analysis to study stability of colloidal dispersions in flow fields

1977

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Trajectories have been computed for two equal sized spherical particles in simple laminar shearing and in uniaxial extensional flows. Effects of interparticle attraction, electrostatic repulsion, and hydrodynamics were included. The results are pertinent to questions of colloidal stability under various conditions of flow. Particulate dispersions can react in several different ways as the intensity of shearing is increased from zero: the dispersion can remain stable; it can be redispersed, if it had been initially flocculated into a weak secondary minimum in the interparticle potential curve; it can be flocculated into a strong primary minimum in the potential curve; or, in extreme cases, it can be redispersed from the primary minimum. Results are presented which illustrate criteria for flocculation or stability to both laminar shearing and extensional flow. It is shown that hydrodynamic effects can significantly alter the criteria developed for stability of dispersions to Brownian coagulation.

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The mechanical stability of colloidal dispersions

Cited by 18 publications

References 7 publications

Stability Characteristics of Nanoparticles in a Laminar Linear Shear Flow in the Presence of DLVO and Non-DLVO Forces

Stability Characteristics of Nanoparticles in a Laminar Linear Shear Flow in the Presence of DLVO and Non-DLVO Forces

Fouling behavior of microstructured hollow fibers in cross-flow filtrations: Critical flux determination and direct visual observation of particle deposition

Use of trajectory analysis to study stability of colloidal dispersions in flow fields

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