Colloidal Particles at Water-Glass Interface: Analyzing Videomicroscopic Data

Lüthi, Yves; Rička, J.

doi:10.1006/jcis.1998.5662

Cited by 20 publications

(21 citation statements)

References 18 publications

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“…This is the probability for a particle arriving at the surface in an infinitesimal time interval ␦t at t to remain adsorbed at least until t ϩ . Our experimental findings, reported in (15), indicate that the surface properties do not change during the experiment and thus P( /t) ϭ P(). Our results on release kinetics are discussed in more detail in Refs.…”

Section: The Observablesmentioning

confidence: 63%

“…Similarly large c at comparably high ionic strength have been reported previously (11,13,19), but interpreted as the result of blocking. In our case this large c is an artefact resulting from the limited optical pair resolution (15). When using 1 m as the upper limit of the effective blocking diameter d B in the RSA-model, we would expect saturation at s ϭ 0.55 ϫ 4/(d B 2 ) Ϸ 70 ϫ 10 10 particles/ m 2 .…”

Section: ϫ2mentioning

confidence: 96%

“…From the micrographs one can determine not only the number of adhering particles but also their distribution on the surface (9 -13). With an adequate image processing software one can easily achieve a position resolution of few tens of nanometers (14,15). The particle pair resolution is, unfortunately, still limited to the order of the light wavelength, i.e., considerably poorer than with today's scanning probe techniques such as atomic force microscopy (16).…”

Section: Introductionmentioning

confidence: 99%

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Colloidal Particles at Water-Glass Interface: Deposition Kinetics and Surface Heterogeneity

Lüthi

Rička

Borkovec

1998

Journal of Colloid and Interface Science

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Section: The Observablesmentioning

confidence: 63%

Section: ϫ2mentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Colloidal Particles at Water-Glass Interface: Deposition Kinetics and Surface Heterogeneity

Lüthi

Rička

Borkovec

1998

Journal of Colloid and Interface Science

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“…The parallel-flow channel and the impinging jet cell are two widely used techniques for particle deposition experiment owing to their numerous advantages such as well possessing controlled and characterized hydrodynamic flow, allowing direct observation of the deposition process by videomicroscopes, etc. Experiments on particle deposition in a parallel-plate channel pressure-driven flow were performed by Fattah et al [16], Lüthi and Rička [17] and Lüthi et al [18] using latex particles and glass collector surfaces. These experimental works [16][17][18] studied the spatial and temporal distributions of the deposited colloids that were obtained by optical microscopic imaging followed by detailed image processing and data extraction routines.…”

Section: Introductionmentioning

confidence: 99%

“…Experiments on particle deposition in a parallel-plate channel pressure-driven flow were performed by Fattah et al [16], Lüthi and Rička [17] and Lüthi et al [18] using latex particles and glass collector surfaces. These experimental works [16][17][18] studied the spatial and temporal distributions of the deposited colloids that were obtained by optical microscopic imaging followed by detailed image processing and data extraction routines. Lettieri et al [19] studied the transport and trapping of particles in microfluidic recirculatory flows generated by a combination of electrosmosis and applied pressure.…”

Section: Introductionmentioning

confidence: 99%

Colloidal particle deposition from electrokinetic flow in a microfluidic channel

Unni¹,

Yang²

2009

Electrophoresis

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This study reports a theoretical and experimental study on the irreversible deposition of colloidal particles from electrokinetic microfluidic flow. The electrokinetic particle transport model presented in this study is based on the stochastic Langevin equation, incorporating the electrical, hydrodynamic, Derjaguin-Landau-Verwey-Overbeek colloidal interactions and random Brownian motion of colloidal particles. Brownian dynamics simulation is used to compute the particle deposition in terms of the surface coverage. Direct videomicroscopic observation using the parallel-plate flow cell technique is employed to determine the deposition kinetics of polystyrene latex particles in NaCl electrolytes. The theoretical predictions are compared with experimental results, and a reasonable agreement is found.

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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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Colloidal Particles at Water-Glass Interface: Analyzing Videomicroscopic Data

Cited by 20 publications

References 18 publications

Colloidal Particles at Water-Glass Interface: Deposition Kinetics and Surface Heterogeneity

Colloidal Particles at Water-Glass Interface: Deposition Kinetics and Surface Heterogeneity

Colloidal particle deposition from electrokinetic flow in a microfluidic channel

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

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