Electrophoretic mobility and primary electroviscous effect of dilute “hard” prolate ellipsoids

Allison, Stuart A.

doi:10.1016/j.jcis.2004.08.055

Cited by 16 publications

(21 citation statements)

References 33 publications

(98 reference statements)

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“…Although Ludox is spherical, goethite is not [14] as are many other metal oxide colloidal particles. Provided the particles are fairly large, particle shape is expected to have only a minor effect on electrophoretic mobility [60][61][62], but a far more significant effect on the viscosity [61]. Modeling of the PEV effect of nonspherical particles is more difficult than for spherical particles, but it is nonetheless possible even for structures that possess gel layers [24].…”

Section: Discussionmentioning

confidence: 99%

“…For large particles, (κd 1 where κ is the Debye-Huckel screening parameter (Eq. (29)) and d is the smallest linear dimension of the particle), the electrophoretic mobility, μ, of a prolate spheroid is comparable to that of a sphere of radius a = d provided the reduced potential, y(a), is the same for both [60][61][62]. Thus, modeling goethite as a sphere of roughly 30 nm radius should be a fairly good model for goethite with respect to μ.…”

Section: Goethitementioning

confidence: 99%

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Electrokinetic modeling of metal oxides

Allison

2009

Journal of Colloid and Interface Science

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Section: Discussionmentioning

confidence: 99%

Section: Goethitementioning

confidence: 99%

Electrokinetic modeling of metal oxides

Allison

2009

Journal of Colloid and Interface Science

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“…Given the discussion in Section 2.1, we rule out particle shape and distribution of charge as being responsible for the discrepancy. Although spherical models have been used to treat the relaxation effect, this procedure should also be fairly accurate when applied to ellipsoidal [47] and irregular, but globular particles in general [65]. Consequently, we shall next explore the possibility of multiple species due to complex formation, which has been proposed previously by independent investigators [13,14].…”

Section: An Examination Of the Relaxation Effect For Anions Salicylatmentioning

confidence: 98%

“…In an earlier study, straightforward polynomial fits were considered in three different BGEs [47]. Recently, we have found the following fitting function to be both simpler and more accurate,…”

mentioning

confidence: 99%

The dependence of the electrophoretic mobility of small organic ions on ionic strength and complex formation

et al. 2010

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The ionic strength dependence of the electrophoretic mobility of small organic anions with valencies up to -3 is investigated in this study. Provided the anions are not too aspherical, it is argued that shape and charge distribution have little influence on mobility. To a good approximation, the electrophoretic mobility of a small particle should be equal to that of a model sphere with the same hydrodynamic radius and same net charge. For small ions, the relaxation effect (distortion of the ion atmosphere from equilibrium due to external electric and flow fields) is significant even for monovalent ions. Alternative procedures of accounting for the relaxation effect are examined. In order to account for the ionic strength dependence of a specific set of nonaromatic and aromatic anions in aqueous solution, it is necessary to include complex formation between the anion with species in the BGE. A number of possible complexes are considered. When the BGE is Tris-acetate, the most important of these involves the complex formed between anion and Tris, the principle cation in the BGE. When the BGE is sodium borate, an anion-anion (borate) complex appears to be important, at least when the organic anion is monovalent. An algorithm is developed to analyze the ionic strength dependence of the electrophoretic mobility. This algorithm is applied to two sets of organic anions from two independent research groups.

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“…The theory of electrophoresis is best developed for free solution (no gel support present), particularly for spherical particles [3][4][5][6][7]. Free solution electrophoresis of rodlike [8], ellipsoidal [9][10][11], arbitrarily shaped [12,13], "hairy" [14][15][16][17][18], and particles containing special surface conductance properties [19,20] have also been treated theoretically.…”

Section: Introductionmentioning

confidence: 99%