Colloid and surface properties of clay suspensions

Swartzen-Allen, S.Lee; Matijević, Egon

doi:10.1016/0021-9797(75)90261-1

Cited by 63 publications

(13 citation statements)

References 20 publications

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“…As these data show, the Gouy model gives a much slower decay in the values of the potential as a function of the distance than the multimedia model presented in this paper. For example, at a distance of (Hauser and Le Beau, 1941;Oakes, 1960;Swartzen-Allen and Matijevic, 1975) represent the potential at a plane of shear separated by thicknesses of one or two water molecules from a clay surface, the values of the potential obtained from the present model are more in line with the experimental values of clays than the Gouy model.…”

Section: Non-interacting Systemsupporting

confidence: 67%

Effect of the Dielectric Constant on the Double Layer on Clays

Helmy

Natale

1985

Clays and clay miner.

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Abstract--Electric potentials as a function of distance were calculated for a model of the double layer on clays in which a surface zone a few water molecules thick has a low dielectric constant. This zone is followed by bulk water with a normal dielectric constant. The double layer potentials were found to be lower than those obtained from the Gouy model, in which water has a normal dielectric constant throughout the double layer.

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Section: Non-interacting Systemsupporting

confidence: 67%

Effect of the Dielectric Constant on the Double Layer on Clays

Helmy

Natale

1985

Clays and clay miner.

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“…The montmorillonite sample (from Almer~a, Spain, with cation exchange capacity -100 meq/g dry clay) was first analysed by X-ray diffraction and chemical methods, and was converted to the Ca-form following the method described in detail by SwartzenAllen and Matijevi8 [7]. Sufficient amount of homoionic clay was dispersed in 2-propanol (Merck, analytical grade) and then separated, via repeated settling and centrifugation, into four suspensions with particle sizes (equivalent spherical diameters) ranging, respectively, in the following intervals: a) 4-8 gin; b) 2-4 Fm; c) 1-2 btm, and d) < 1 t~m.…”

Section: Methodsmentioning

confidence: 99%

“…Electroosmosis and streaming potential [5,6], and particularly electrophoresis [2,7], are the electrokinetic techniques most frequently employed when dealing with clay systems. The liquid media used have very often been aqueous inorganic electrolyte solutions, and scant attention appears to have been paid to dispersions in organic liquids.…”

Section: Introductionmentioning

confidence: 99%

On the electrophoretic mobility and zeta potential of montmorillonite in non-aqueous media

Delgado

González‐Caballero

Bruque

1986

Colloid & Polymer Sci

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Experimental results on the electrophoretic velocity and mobility of Ca-montmorillonite in 2-propanol are reported. The variation of the electrophoretic velocity with the externally applied electric field and the particle size range, at constant volume fraction and temperature, is considered. Given the difficulties for determining the types and concentrations of ions present in these liquid media, two methods are discussed for the estimation of the double layer thickness and hence the product xa, necessary for the determination of the zeta potential (~) of the interface. Although both methods of calculation yield different values of xa, the results for the zeta potential are very similar in the regions of xce and ~ characteristic of our sEstems. The application to the experimental data of three theoretical relations between electrophoretic mobility and zeta potential is also discussed.

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“…Carriere et al (3) measured the X-ray photoelectron spectra of some silicon-oxygen compounds, and found that there was a difference in the Si 2p binding energy between quartz and silicates, such as feldspars and micas. Adsorption of Cr(NH 3 ) 6 and Cr(en) 3 3ϩ on clay minerals and characterization of chromium, measuring Cr 2p core level binding energies, were also performed (4) by XPS. It was concluded that Cr adsorbed as the Cr(III) aqua ion at pH Ͻ 4 and Cr(III) hydroxide at pH 6, 8, and 10.…”

Section: Introductionmentioning

confidence: 99%

“…With the help of XPS investigation, Knudson and McAtee (5) and Swartzen-Allen and Matijevic (6) reported on cobalt chelates with montmorillonite which exceeded the ion exchange capacity of the clay. Kopplemen and Dillard (7) found that the adsorption of Co(NH 3 ) 6 ϩ on chlorite proceeded by hydrolysis of the complex and reduction of Co(III) to Co(II). The valence state of Pb adsorbed on montmorillonite was studied by Counts et al (8) based on the binding energies of Pb 4f electrons.…”

Section: Introductionmentioning

confidence: 99%