Electrooptic study of an experimental synthetic clay in aqueous dispersion

Jennings, B. R.; Brown, B. L.; Plummer, H. C.

doi:10.1016/0021-9797(70)90153-0

Cited by 14 publications

(7 citation statements)

References 32 publications

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“…Here C is the capacitance and V is the applied voltage. It should be noted that the saturation effects observed in other studies at field strengths of several hunlreds V/cm [2,10,Ll. ] were obtained for a longer duration of the electric pulse.…”

Section: Introductionmentioning

confidence: 78%

“…Pulsed light-scattering exper1ments have been reported for several clay ndnerals suspended in dilute electrolyte solutions [2,10]. In the present note we report on a study of changes in scattered light of sodium-montroorillonite suspended in sodium chloride, am sodium chloride-sodium phosphate solutions, resulting from the application of very short am strong electrical fields.…”

Section: Introductionmentioning

confidence: 82%

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Light Scattering of Montmorillonite in NaCl and Na‐Phosphate Solutions Subjected to Pulsed Electric Fields

Lahav

Raziel

Pecht

1971

Israel Journal of Chemistry

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Changes in scattered light of fresh and aged sodium montmorillonite, suspended in sodium chloride and phosphate solutions after application of very short and strong electrical fields, was studied. Montmorillonite suspensions behave like polydispersed systems. Results of phosphate treated montmorillonite were compared with phosphate‐free montmorillonite, in which a flocculation process took place. The range of particle size for the phosphate treated montmorillonite was calculated.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 82%

Light Scattering of Montmorillonite in NaCl and Na‐Phosphate Solutions Subjected to Pulsed Electric Fields

Lahav

Raziel

Pecht

1971

Israel Journal of Chemistry

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“…Previous work has shown that for bentonite particles (Shah, 1963) and for its synthetic analogue, laponite (Jennings et aL, 1970), the orientation in an electric field is due to the interaction of the field with a permanent dipole directed across the clay platelet and an induced dipole which is in quadrature with this.…”

Section: Pulsed Electric Fieldsmentioning

confidence: 99%

“…Many birefringence studies on clays, however, have shown anomalous behaviour (Jennings et al, 1970;Brown & Jennings, 1973), often without satisfactory explanation. In particular, peculiar transients of bentonite sols in pulsed dc electric fields have been * Now at the Department of Physics, University of Zambia, P.O.…”

Section: Introductionmentioning

confidence: 99%

A study of the birefringence exhibited by celadonite solutions subjected to electric fields

Baily

1977

Clay miner.

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This paper reports an electric birefringence study on dilute solutions of the clay mineral, celadonite. The results show that celadonite particles in solution have the form of rectangular platelets and are characterized by a permanent dipole-moment perpendicular to the plane of the platelet and an induced dipole-moment in the plane of the platelet along the longest dimension. It is suggested that the permanent dipole-moment is an inherent property of the atomic structure of the platelet, whilst the induced dipole-moment is a consequence of the ion-atmosphere surrounding the celadonite particles. The paper also demonstrates the usefulness of electro-optic techniques in studyirig problems in clay minerology.

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“…The relaxation upon removal of the electric field follows the Benoit equation * Present address: Agriculture Experiment Station, CollegeofAgriculture, U niversityofldaho, Moscow, Idaho 83843, U.S.A. (Benoit, 1951;Brown, 1971;Jennings et al, 1970;Kahn and LewiS, 1954;Mehta, 1973;O'Konski and Haltner, 1957;O'Konski et al, 1959;Shah, 1963) which relates the birefringence decay with time after initiation of relaxation.…”

Section: Introductionmentioning

confidence: 99%

Electro-Optic Investigation of the Permanent and Induced Dipoles of Montmorillonite as Affected by Electrolyte Concentration

Schepers

1974

Clays and clay miner.

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Abstrae~An electro-optic birefringence technique was employed to study the orientation mechanism of montmorillonite in an electric field. The instantaneous reversal of the field polarity produced evidence of a low voltage permanent dipole and a high voltage induced dipole. This technique was used to study the effect o felectrolyte concentration on the rotational diffusion coefficient, a measure of the rate at which the particles rotate or relax, within the solution, from a preferred orientation. Thus, a measure of the immediate environment of the particles was obtained that is not an average effect for the whole system, yet allows for the full development of the clay-cation-water interactions under the experimental conditions. It was found that particle rotation could be accounted for using the measured particle size and normal water viscosity only when the double layer was fully developed, with no free ions or other perturbations. As soon as perturbations were applied, either by adding salts or applying an electric field, the measured particle size and normal viscosity would not account for the data. Either the rotating moiety has to be larger, that is, be a particle plus a water hull, or the viscosity greater, or in some cases both.

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Electrooptic study of an experimental synthetic clay in aqueous dispersion

Cited by 14 publications

References 32 publications

Light Scattering of Montmorillonite in NaCl and Na‐Phosphate Solutions Subjected to Pulsed Electric Fields

Light Scattering of Montmorillonite in NaCl and Na‐Phosphate Solutions Subjected to Pulsed Electric Fields

A study of the birefringence exhibited by celadonite solutions subjected to electric fields

Electro-Optic Investigation of the Permanent and Induced Dipoles of Montmorillonite as Affected by Electrolyte Concentration

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