Interaction of unequal double layers at constant charge

Gregory, John

doi:10.1016/0021-9797(75)90081-8

Cited by 407 publications

(241 citation statements)

References 15 publications

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“…sphere---sphere, and sphere---plate system based on constant potentials (CP), constant charge (CC), and linear superposition approximation (LSA) assumptions (Hogg, Healy et al 1966;Wiese and Healy 1970;Gregory 1975). Among equations based on three different assumptions, the LSA---based expression was considered as the one that would…”

Section: Electrical Double Layer Interactionmentioning

confidence: 99%

Deposition of Silver Nanoparticles in Geochemically Heterogeneous Porous Media: Predicting Affinity from Surface Composition Analysis

Lin

Cheng

Bobcombe

et al. 2011

Environ. Sci. Technol.

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This study focused on the effect of surface heterogeneity on the affinity of nanoparticle (for that surface) and the viability of using surface composition analysis to facilitate the prediction of such an affinity. The transport of the uncoated silver nanoparticles (AgNPs) in a porous medium composed of silica glass beads partially covered with iron oxide was studied and compared to that in a porous medium composed of unmodified glass beads (GB). It was found that at relative high pH (8.3) there existed only a small difference in AgNPs mobility in both porous media unless the ionic strength was sufficiently high while at lower pH (5) AgNPs had considerably lower affinity for the GB collectors compared to that of the iron oxide coated glass beads (FeO---GB) collectors, even at relative low ionic strengths. There was a linear correlation between the average nanoparticle affinity for media composed of mixtures of FeO---GB and GB collectors and the relative composition of those media as quantified by the mixing mass ratios of the two types of collectors, so that the average AgNPs affinity for these media is readily predicted from the mass (or surface) weighted average of affinities for each of the surface types. Using X---ray Photoelectron Spectroscopy (XPS) to quantify the composition of the collector surface appears to be a viable means to predict the affinity between the nanoparticles and a collector surface with known composition provided that a relevant correlation curve could be established from measured affinity between v the nanoparticles and collector surfaces with similar but different composition (i.e. surfaces with the same components but different proportion of each component). vi ContentsAbstract

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Section: Electrical Double Layer Interactionmentioning

confidence: 99%

Deposition of Silver Nanoparticles in Geochemically Heterogeneous Porous Media: Predicting Affinity from Surface Composition Analysis

Lin

Cheng

Bobcombe

et al. 2011

Environ. Sci. Technol.

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“…A simple expression for the interaction energy between charged flat plates in an electrolyte solution is obtained [18] based on the assumptions that the potential in the region of the minimum (at the midpoint position between two overlapping double layers) is sufficiently small and is just the sum of the contributions from the isolated plates. This linear superposition approximation leads to the following expression for the potential energy of interaction [14]:…”

Section: Interactions Between Spherical Double Layersmentioning

confidence: 99%

Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow

Georgieva

Dijkstra

Fricke

et al. 2010

Journal of Colloid and Interface Science

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We have investigated the phenomenon of flow-induced aggregation in highly concentrated colloidal dispersions exposed to strongly converging flow fields. This phenomenon is relevant not only for classical technical operations like coating, pumping or filtration, but also for the application of concentrated suspensions in upcoming processing technologies based on microfluidic devices. A ring-slit device (gap height 10 micrometers to 25 micrometers), which allows for a variation of flow kinematics in a wide range, has been developed in order to investigate this phenomenon. Various polymer dispersions with different particle surface properties have been used as model systems. Our experiments exclude, that channel clogging is due to retention of pre-existing aggregates, fouling or hydrodynamic bridging. Instead, we demonstrate that clogging of the microchannel is induced by hetero-coagulation between primary colloidal particles and micron-sized impurities present at concentrations on the order of 100 ppm to 1000 ppm. Clogging can occur even if the diameter of these impurities is less than a tenth of the gap height. Aggregation takes place in the converging flow field at the channel entrance, but not in the shear field within the slit. It can be suppressed by appropriate stabilization of the primary particles

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“…The DLVO profiles for the colloids and their interaction with the glass surface were calculated according to [35]:…”

Section: Dlvo Forcesmentioning

confidence: 99%

Geological Disposal of Nuclear Waste: Fate and Transport of Radioactive Materials

Sharma¹

2012

Nuclear Power- Practical Aspects

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Interaction of unequal double layers at constant charge

Cited by 407 publications

References 15 publications

Deposition of Silver Nanoparticles in Geochemically Heterogeneous Porous Media: Predicting Affinity from Surface Composition Analysis

Deposition of Silver Nanoparticles in Geochemically Heterogeneous Porous Media: Predicting Affinity from Surface Composition Analysis

Clogging of microchannels by nano-particles due to hetero-coagulation in elongational flow

Geological Disposal of Nuclear Waste: Fate and Transport of Radioactive Materials

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