Surface properties and flow behavior of kaolinite. Part I: Electrophoretic mobility and stability of kaolinite sols

Hunter, Robert J.; Alexander, A. E.

doi:10.1016/0095-8522(63)90076-x

Cited by 51 publications

(7 citation statements)

References 28 publications

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“…Furthermore, if the number of aluminum atoms is less than that required (ϳ0.15%), the observed charge would be produced. Alternatively, if occasional aluminum atoms in the lattice are surrounded by oxygen atoms the disposition of which tends to be tetrahedral rather than octahedral, then the same effect would be produced (12).…”

Section: Resultsmentioning

confidence: 88%

“…The negative surface charge on oxides, originates from the acidic dissociation of the surface hydroxyl groups and leads, subsequently, to the adsorption of cations on oxides (11). However, the origin of negative changes on the surfaces of perlite can be explained as discussed by Hunter and Alexander for kaolinite (12). The charge at the surface cannot be completely accounted for by isomorphous replacement.…”

Section: Resultsmentioning

confidence: 96%

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Surface Titrations of Perlite Suspensions

Alkan

1998

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 88%

Section: Resultsmentioning

confidence: 96%

Surface Titrations of Perlite Suspensions

Alkan

1998

Journal of Colloid and Interface Science

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“…The major deviation from the theory is the non-logarithmic distribution of the accumulated material throughout the porous media. This deviation also applies to other theories developed including those of Ives (1960) and Hunter and Alexander (1963). These theories appear to be valid for combinations of large particle size media and suspensions, but do not hold for stable suspensions and relatively fine particle size suspensions.…”

Section: Discussionmentioning

confidence: 88%

“…Below the surface the removal mechanism more nearly follows the theory presented earlier in the paper and is probably a combination of diffusion and gravitational settling in the pore spaces where flow is restricted. It is unfortunate that none of the theories of Hall (1957), Ives (1960), or Hunter and Alexander (1963) held for this system. It appears that even though they held for the conditions under which they were tested, they are not the universally-applicable fundamental theory of flow of colloidal suspensions in porous media necessary to predict behavior over a wide range of conditions.…”

Section: Discussionmentioning

confidence: 99%

Deposition of Montmorillonite from Suspension During Flow Through Porous Media

Curry

1967

Clays and clay miner.

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SODIUI~-SATURATED montmorillonite was used to prepare aqueous suspensions of varying concentration between 0.06% and 3.0%. Compacted columns of glass beads and carborundum constituted the porous media. The system was maintained under saturated flow conditions at hydraulic gradients of 2 and 4. In order to study the relationship of clay properties to those of the porous media, the zeta potential of both suspension and media was determined. A mathematical model of the system was developed that would predict the deposition of clay at various depths in the columns, given concentration and flow rate of the suspensions. In order to test this model, a procedure was developed for tagging the clay with 46Sc, sampling the columns, and determining the amount of deposition using a single-channel gamma-ray spectrometer. Using an activity level of 0.15 microeurie per liter of a 1% suspension it was possible to detect reliably 10 mg of clay in a 40 g sample of the porous media. The results indicate two mechanisms operating in the process of removal of the clay from suspension. One of these, interstitial straining, operates at the surface of the porous media column; while the second, a combination of diffusion and gravitational settling, operates below the surface.The results of this research have potential applications in the solution of engineering problems relating to water resources conservation such as reservoir seepage control, infiltration of sediment-laden water into the soil, and ground water recharge. Also, the results may be important for answering questions concerning pollutant movement into the water supply through porous strata. All the above are examples in which a colloidal suspension is moving into or through porous media; therefore, an improved understanding of the principles of flow of colloidal suspensions in porous media can contribute to the solution of these engineering problems.

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“…It can be determined by zeta potential which is one of the electro-osmotic properties of clay minerals. Ion exchange capacity of kaolinite samples can be determined by this technique [4][5][6][7]. Other important application of electrokinetic properties is electrophoretic deposition (EPD).…”

Section: Introductionmentioning

confidence: 99%

Electrophoretic deposition of kaolin: effects of Al/(Al + Si) ratio, surface charge, mineral, structural and morphological properties

Ghasemi

Arabi

2015

J Mater Sci: Mater Electron

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Aluminosilicate compounds such as zeolite and kaolin and their coatings can be useful as a support of sensors and absorbers. In this study, electrophoretic deposition (EPD) of four types of kaolin has been reported. Various types of kaolin differ from each other in Al/ (Al ? Si) ratio, mineral compositions, surface charge and size of kaolinite flakes. EPD in aqueous and non-aqueous (ethanol) suspensions were compared. Quality of deposition and yield of non-aqueous suspension was higher due to the higher current density which can be resulted from lower polarity index of ethanol. It was found that the kaolin sample with the highest ability of ion extracts, higher zeta potential in the wide range of pH (-20 to -60 mV) and larger diameter of basal surfaces with respect to edge size of kaolinite flakes were essential factors to obtain completely coverage of aluminum substrate below 15 min. This kaolin coating can be useful in sensors and catalysts, because of high surface area in contact with gas molecules.

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Surface properties and flow behavior of kaolinite. Part I: Electrophoretic mobility and stability of kaolinite sols

Cited by 51 publications

References 28 publications

Surface Titrations of Perlite Suspensions

Surface Titrations of Perlite Suspensions

Deposition of Montmorillonite from Suspension During Flow Through Porous Media

Electrophoretic deposition of kaolin: effects of Al/(Al + Si) ratio, surface charge, mineral, structural and morphological properties

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