Flow-Induced Surface Blocking Effects in Adsorption of Colloid Particles

Adamczyk, Zbǐgniew; Siwek, Barbara; Szyk, Lilianna

doi:10.1006/jcis.1995.1374

Cited by 60 publications

(83 citation statements)

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“…With purely electrostatic interactions c should equal the effective particle diameter d B ϭ 2(a ϩ l D ), where a is the geometrical particle radius and l D is in the order of the Debye length. The concept of the effective particle diameter, introduced by Adamczyk and Warszyński (16), has been verified in simulation (16) (19,20). However, this should result in an elongated shape of the correlation hole (19,20), while our g*() exhibits circular symmetry.…”

Section: Figmentioning

confidence: 91%

Colloidal Particles at Water-Glass Interface: Analyzing Videomicroscopic Data

Lüthi

Rička

1998

Journal of Colloid and Interface Science

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Section: Figmentioning

confidence: 91%

Colloidal Particles at Water-Glass Interface: Analyzing Videomicroscopic Data

Lüthi

Rička

1998

Journal of Colloid and Interface Science

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“…Under steady-state conditions, the value of S max can be determined by direct microscopic observations in simplified systems (Adamczyk et al, 1992), inverse optimization of experimental breakthrough curve data that exhibit blocking behavior (Adamczyk et al, 1994;Johnson and Elimelech, 1995), or theoretically estimated from torque balance calculations . Experimental and theoretical results demonstrate that S max is sensitive to the solution chemistry and hydrodynamic conditions (Adamczyk et al, 1995;Sasidharan et al, 2014). Such changes in S max with physicochemical conditions have been related to the amount of colloid release during transient conditions (Bedrikovetsky et al, 2011;.…”

Section: Introductionmentioning

confidence: 98%

Equilibrium and kinetic models for colloid release under transient solution chemistry conditions

Bradford

Torkzaban

Leij

et al. 2015

Journal of Contaminant Hydrology

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We present continuum models to describe colloid release in the subsurface during transient physicochemical conditions. Our modeling approach relates the amount of colloid release to changes in the fraction of the solid surface area that contributes to retention. Equilibrium, kinetic, equilibrium and kinetic, and two-site kinetic models were developed to describe various rates of colloid release. These models were subsequently applied to experimental colloid release datasets to investigate the influence of variations in ionic strength (IS), pH, cation exchange, colloid size, and water velocity on release. Various combinations of equilibrium and/or kinetic release models were needed to describe the experimental data depending on the transient conditions and colloid type. Release of Escherichia coli D21g was promoted by a decrease in solution IS and an increase in pH, similar to expected trends for a reduction in the secondary minimum and nanoscale chemical heterogeneity. The retention and release of 20 nm carboxyl modified latex nanoparticles (NPs) were demonstrated to be more sensitive to the presence of Ca 2+ than D21g. Specifically, retention of NPs was greater than D21g in the presence of 2 mM CaCl 2 solution, and release of NPs only occurred after exchange of Ca 2+ by Na + and then a reduction in the solution IS. These findings highlight the limitations of conventional interaction energy calculations to describe colloid retention and release, and point to the need to consider other interactions (e.g., Born, steric, and/ or hydration forces) and/or nanoscale heterogeneity. Temporal changes in the water velocity did not have a large influence on the release of D21g for the examined conditions. This insensitivity was likely due to factors that reduce the applied hydrodynamic torque and/or increase the resisting adhesive torque; e.g., macroscopic roughness and grain-grain contacts. Our analysis and models improve our understanding and ability to describe the amounts and rates of colloid release and indicate that episodic colloid transport is expected under transient physicochemical conditions. Published by Elsevier B.V.

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“…There are two cases in particle deposition studies that should be mentioned in this regard; (i) favourable deposition where the combined van der Waals and EDL interactions between the particle and wall are attractive, (ii) unfavourable deposition where a repulsive energy barrier exists in the interaction energy profile. In the literature, good agreement between theory and experiment has been reported when deposition occurs under favourable conditions (Adamczyk et al, 1995;Elimelech et al, 1991). In contrast, large discrepancies are usually found between theoretical and experimental deposition rates under unfavourable deposition conditions (Sjollema and Busscher, 1989;Elimelech and O'Meila, 1990).…”

Section: Comparison Of Theoretical Predictions With Experimental Resultsmentioning

confidence: 87%

Kinetics of Colloidal Particle Deposition to a Solid Surface from Pressure Driven Microchannel Flows

Unni

Yang

2007

Can J Chem Eng

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by conducting deposition experiments with model colloids and collectors under controlled chemical conditions in a well-defined experimental system. To investigate the effect of particle size on deposition under attractive double layer interactions, the particle mass transport equation was formulated incorporating van der Waals, electrical and hydrodynamic interactions and was solved numerically (Elimelech, 1991(Elimelech, , 1994Elimelech et al., 1995). The theoretical predictions were in good agreement with the experimental data. Yang et al. (1998) provided in-depth theoretical analyses of the kinetics of particle deposition in an impinging jet cell system. The mass transport equation incorporating van der Waals, electrostatic double layer (EDL) interactions and gravity was solved numerically. The results demonstrated that the asymmetric EDL interaction, which has been ignored in previous studies, has a pronounced influence on particle deposition.Kinetics of colloidal particles deposition onto a solid surface in hydrodynamic flows was studied. A phenomenological mathematical model was presented to analyze the particle deposition from pressure-driven flows in a parallel-plate microchannel. The two-dimensional mass transport equation incorporating hydrodynamic convection, particle diffusion, gravity force and DLVO colloidal forces (i.e., the van der Waals and electrical double-layer forces) was solved numerically using a finite difference method to obtain the dimensionless particle deposition rates expressed by the Sherwood number. The numerical predictions of the Sherwood number were compared with the results of videomicroscopic experiments conducted under various physicochemical conditions including electrolyte concentration, particle size and hydrodynamic flow intensity in terms of the Reynolds number, and reasonable good agreement was found.On a étudié la cinétique de la déposition de particules colloïdales en écoulement sur une surface solide. Un modèle mathématique phénoménologique est présenté pour analyser la déposition des particules pour des écoulements sous pression dans un micro-canal à plateaux parallèles. L'équation de transport de matière bidimensionnelle incorporant la convection hydrodynamique, la diffusion des particules, la force de gravité et les forces colloïdales DLVO (à savoir la force de van der Waals et la force électrique à double-couche), a été résolue numériquement à l'aide d'une méthode de différences finies afin d'obtenir les vitesses de déposition des particules adimensionnelles exprimées par le nombre de Sherwood. Les prédictions numériques du nombre de Sherwood ont été comparées aux résultats des expériences par vidéo-microscopie menées dans des conditions physicochimiques variées, dont la concentration d'électrolytes, la taille des particules et l'intensité de l'écoulement hydrodynamique relativement au nombre de Reynolds. Un accord raisonnable a été trouvé.

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Flow-Induced Surface Blocking Effects in Adsorption of Colloid Particles

Cited by 60 publications

References 0 publications

Colloidal Particles at Water-Glass Interface: Analyzing Videomicroscopic Data

Colloidal Particles at Water-Glass Interface: Analyzing Videomicroscopic Data

Equilibrium and kinetic models for colloid release under transient solution chemistry conditions

Kinetics of Colloidal Particle Deposition to a Solid Surface from Pressure Driven Microchannel Flows

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