Electrokinetics of the muscovite mica-aqueous solution interface

Scales, Peter J.; Grieser, Franz; Healy, Thomas W.

doi:10.1021/la00093a012

Cited by 175 publications

(192 citation statements)

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“…This is consistent with earlier findings that the limiting density of charges on silicon oxide is higher so that adsorption of polyelectrolyte is accompanied by additional ionization of SiOH groups to increase the charge density of the silicon oxide from an estimated 2 × 10 18 m -2 at pH 9.2 and low salt concentration. 18 At this pH, the mica has already reached 17,41,42 its maximum possible surface charge density, 2.1 × 10 18 m -2 . 43 It is apparent from the data in Table 1 that (i) at low concentration of salt, the mass adsorbed of 14% QPVP was approximately 1.5 times larger than the one of 98% QPVP, and (ii) the mass adsorbed of 98% QPVP increased with the salt concentration.…”

Section: Resultsmentioning

confidence: 94%

Static and Dynamic Forces between Adsorbed Polyelectrolyte Layers (Quaternized Poly-4-vinylpyridine)

2001

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Static forces (a combination of steric and electrostatic interactions) and dynamic shear forces (resulting from interactions between polymer chains) were measured between quaternized poly-4-vinylpyridine layers (QPVP) adsorbed onto mica from 1 mM borate buffer with or without added 0.25 M NaCl. At the polyelectrolyte concentration chosen, 0.4 mg mL -1 , extended layers were formed at all adsorption conditions. The adsorbed amount of 98% quaternized poly-4-vinylpyridine was lower at low ionic strength than of 14% quaternized, and increased with added salt. Layers formed by one-step adsorption showed a predominantly elastic response to small-amplitude oscillatory shear in the frequency range 0.13-130 Hz. In the case of two-step adsorption, the confined layers allowed viscous dissipation of similar magnitude as the elastic, which suggests that additional chains adsorbing at high salt concentration onto a preformed layer had fewer segments in contact with the solid surface.

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Section: Resultsmentioning

confidence: 94%

Static and Dynamic Forces between Adsorbed Polyelectrolyte Layers (Quaternized Poly-4-vinylpyridine)

2001

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“…This explains the often observed dependency of the surface charge on pH and the salt concentration. The charge regulation model is successfully applied to many materials, especially those where the surface charge is mainly determined by pH, such as oxides, silicon nitride [334,[413][414][415], mica [416][417][418][419] and biological materials.…”

Section: Electrostatic Double-layer Force and Dlvo Theorymentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,242

2,949

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“…Such information is most easily attained for particles with a smooth surface structure, but becomes increasingly difficult for poorly ordered structures [4]. In the absence of knowledge on the relative charges, the zeta potential The ambiguity around these parameters, for anisotropically charged minerals, requires their combined use for a comprehensive estimation of the degree of charge anisotropy.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…However, a charge dependency of this site has also been proposed, not inconsistent with the hydrolysis of silicon in the surface plane [4].…”

Section: Introductionmentioning

confidence: 99%

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Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

Ndlovu¹,

Farrokhpay²,

Forbes³

et al. 2015

Powder Technology

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Please cite this article as: Bulelwa Ndlovu, Saeed Farrokhpay, Elizaveta Forbes, Dee Bradshaw, Characterisation of kaolinite colloidal and flow behaviour using its crystallinity measurements, Powder Technology (2014Technology ( ), doi: 10.1016Technology ( /j.powtec.2014 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractThis study evaluates the possibility of predicting colloidal and flow behaviour of kaolinite suspensions by measuring kaolinite crystallinity. The Hinckley index of different samples was calculated from XRD spectra as an indicator of the crystallinity. Kaolinite samples with a high Hinckley index showed a defined platy morphology with smooth surfaces of low surface area, while progressively roughened basal planes with prevalent broken edges were observed in kaolinite samples of lower Hinckley indices. Despite similarity in the elemental composition, the kaolinite samples present different surface charge properties, likely due to variations in exposed pH dependent edge sites. Poorly crystallised kaolinite samples were characterised by higher yield stresses and viscosities. This study highlights the importance of crystallinity characterisation towards predicting colloidal behaviour and flow characteristics of kaolinite suspensions.

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Electrokinetics of the muscovite mica-aqueous solution interface

Cited by 175 publications

References 0 publications

Static and Dynamic Forces between Adsorbed Polyelectrolyte Layers (Quaternized Poly-4-vinylpyridine)

Static and Dynamic Forces between Adsorbed Polyelectrolyte Layers (Quaternized Poly-4-vinylpyridine)

Force measurements with the atomic force microscope: Technique, interpretation and applications

Characterisation of kaolinite colloidal and flow behaviour via crystallinity measurements

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