Effect of hydrodynamic interaction on the coagulation rate of hydrophobic colloids

Honig, E. P.; Roebersen, G.J; Wiersema, P.H

doi:10.1016/0021-9797(71)90245-1

Cited by 391 publications

(216 citation statements)

References 17 publications

Supporting

Mentioning

207

Contrasting

Unclassified

Order By: Relevance

“…Though there is no complete agreement for different particle sizes, there is no clear dependence between kn and a. This is in agreement with the coagulation theory, which predicts that kll is independent of a, even when hydrodynamic interaction is considered (11,12).…”

Section: Resultssupporting

confidence: 67%

“…When van der Waals attraction and hydrodynamic interaction are taken into account (11,12), kll is found to be 40-65% of the von Smoluchowski value, dependent on the Hamaker constant (A). Double layer repulsion does not affect the rate of rapid coagulation, which follows from the observation that increasing the electrolyte concentration does not increase the rate of coagulation.…”

Section: Discussionmentioning

confidence: 99%

“…Detailed theoretical predictions are available only for the rate constant of this process. The theory considers brownian motion (9), interparticle forces (lb, 10), and hydrodynamic interaction (11,12).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rapid coagulation of polystyrene latex in a stopped-flow spectrophotometer

Lichtenbelt

Pathmamanoharan

Wiersema

1974

Journal of Colloid and Interface Science

Self Cite

102

View full text Add to dashboard Cite

With a stopped-flow method the rapid coagulation by electrolyte of several polystyrene latices is measured. By extrapolating back to zero time the initial process of two single particles forming a doublet is observed. We find an average rate constant kn = 6.0 ;< l0 -12 p-1 cm a sec-1 at 20°C, where p is the number of particles; this constant is lowered to 4.9 ;< 10 -1~ p-1 cm a sec -1 when we assume that the particle diameters are 5% lower than the Dow values. These values are equal to 56 and 46%, respectively, of the yon Smoluehowski values. Using the theory of hydrodynamic interaction, this gives Hamaker constants A = 7.0 X 10 -21 J or 1.5 X 10 -21 J, respectively, in good agreement with theoretical predictions.

show abstract

Section: Resultssupporting

confidence: 67%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Rapid coagulation of polystyrene latex in a stopped-flow spectrophotometer

Lichtenbelt

Pathmamanoharan

Wiersema

1974

Journal of Colloid and Interface Science

Self Cite

102

View full text Add to dashboard Cite

show abstract

“…During the initial stage of coagulation, the formation of doublets from singlets dominates Copyright 9 1984, The Clay Minerals Society the process. Detailed theoretical predictions for doublet formation are available which consider Brownian motion (von Smoluchowski, 1917), interparticle forces (Tambour and Sienfeld, 1980;Marmur, 1979), and hydrodynamic interactions (Spielman, 1970;Honig et aL, 1971). The present study employed photon correlation spectroscopy to measure the rate of doublet formation in coagulating suspensions.…”

Section: Introductionmentioning

confidence: 99%

Colloid Stability of Clays Using Photon Correlation Spectroscopy

Novich

Ring

1984

Clays and clay miner.

100

View full text Add to dashboard Cite

Abstract--Photon correlation spectroscopy (PCS), a dynamic light-scattering technique for particle size measurement, was used to determine the coagulation rates of aqueous dispersions of relatively monodisperse South Carolina Peerless kaolinite, Silver Hill, Montana, illite, Wyoming montmorillonite, and Florida palygorskite. This technique allows quantitative measurement of the rate of coagulation for clay particles where the traditional turbidity method gives only a qualitative measure. The critical coagulation concentrations for KC1 at pH = 10.0 were: 0.199 M for kaolinite, 0.202 M for illite, 0.290 M for montmorillonite, and 0.034 M for palygorskite. The effective Hamaker constants, calculated using DerjaguinLandau-Verwey-Overbeek theory, were: 3.1 • 10 -20 J for kaolinite, 2.5 x 10 -2o J for illite, 2.2 x 10 -20 J for montmorillonite, and i.63 x 10 -19 J for palygorskite. Stern potentials at the critical coagulation concentration at pH 10.0 were: -42.7 mV for kaolinite, -40.7 mV for illite, -21.2 mV for montmorillonite, and -66.9 mV for palygorskite.

show abstract

“…In this case, combination with the condition 9 > 4 X 10 -4 will allow workable optical densities, but only for large wavelengths (near 800 rim) and for a rather limited range of particle sizes (radius about 250 nm) (19). 3 We conclude this discussion with a few more general remarks on the diffusion model used in the computations, considering especially the question to which extent the application of the computed results is restricted by the use of the boundary conditions [2]- [4]. Strictly speaking, the assumption of a completely random initial particle distribution (Eq.…”

Section: Discussionmentioning

confidence: 99%

Calculation of the rate of coagulation of hydrophobic colloids in the non-steady state

Roebersen¹,

Wiersema²

1974

Journal of Colloid and Interface Science

Self Cite

View full text Add to dashboard Cite

In accurate coagulation measurements, the observed coagulation rate should be extrapolated to time zero to find the rate of formation of doublets from singlet particles. In the theoretical calculation of coagulation rates, generally a steady state is assumed. At the onset of coagulation, however, a transient state is present. The results are given of numerical computations of the transient-state coagulation rate for the cases of Van der Waals attraction only and of Van der Waals attraction combined with double layer repulsion. The duration of the non-steady state is about tile same as the one calculated by Von Smoluchowski for the case of no long-range interaction. It is expected that no transient effects will be found in classical coagulation experiments, but they may interfere with rapid (stopped-flow) measurements of the rate of rapid coagulation.

show abstract

Effect of hydrodynamic interaction on the coagulation rate of hydrophobic colloids

Cited by 391 publications

References 17 publications

Rapid coagulation of polystyrene latex in a stopped-flow spectrophotometer

Rapid coagulation of polystyrene latex in a stopped-flow spectrophotometer

Colloid Stability of Clays Using Photon Correlation Spectroscopy

Calculation of the rate of coagulation of hydrophobic colloids in the non-steady state

Contact Info

Product

Resources

About