Calculation of Zeta Potential from Electrokinetic Measurements on Titania Plugs

Spanos, N.; Koutsoukos, Petros G.

doi:10.1006/jcis.1999.6169

Cited by 17 publications

(14 citation statements)

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“…It may be observed that, as in the case of Ref. 47, ζ Smol is underestimated, especially at low ionic strength values, where the effect of surface conductivity is more pronounced. At high ionic strength values, where the contribution of surface conductivity to the conductivity of the entire plug is negligible (Du ≪ 1), it is anticipated that the ζ‐potentials calculated are almost identical, regardless of the theory according to which they were calculated.…”

Section: Resultsmentioning

confidence: 62%

“…In the present work, a combined study of the ‘anatase/electrolyte solution’ interface, both in suspension and in densely packed particles of synthetic and well characterized anatase, was undertaken. In the case of the densely packed particles, this work accomplishes the study reported in Refs 46 and 47 by elucidating the role of the degree of packing and of pH to the above mentioned parameters, i.e. ζ‐potential, surface conductivity and mobility of the counter ions behind the shear plane.…”

Section: Introductionmentioning

confidence: 65%

“…However, studies addressing issues such as the properties of the electrical double layer (EDL) in closely packed particles of titania are rather rare. The considerable progress over the past decades in electrokinetics,42–45 contributed significantly to the better interpretation of the results of electrokinetic measurements on titania plugs made of densely packed particles 46, 47. Electrokinetic measurements in porous plugs made of densely packed particles, have the advantage of yielding measurements of the ζ‐potential over a wide range of ionic strength values of the surface conductivity, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Oxygen Capture by Lithiated Organozinc Reagents Containing Aromatic 2-Pyridylamide Ligands

et al. 2001

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The sequential reaction of ZnMe2 with a 2-pyridylamine (HN(2-C5H4N)R, R = Ph: 1; 3,5-Xy (=3,5-xylyl): 2; 2,6-Xy: 3; Bz (=benzyl): 4; Me: 5), tBuLi and thereafter with oxygen affords various lithium zincate species, the solid-state structures of which reveal a diversity of oxo-capture modes. Amine 1 reacts to give both dimeric THF [Li(Me)OZn[N(2-C5H4N)Ph]2] (6), wherein oxygen has inserted into the Zn-C bond of a [MeZn[N(2-C5H4N)-Ph]2] ion, and the trigonal Li2Zn complex, bis(OtBu)-capped (THF x Li)2-[[(mu3-O)tBu]2Zn[N(2-C5H4N)Ph]2] (7). The structural analogue of 6 (8) results from the employment of 2, while the use of more sterically congested 3 yields a pseudo-cubane dimer [(THF x [Li(tBu)OZn(OtBu)Me]]2] (9) notable for the retention of labile Zn-C(Me). Amines 4 and 5 afford the oxo-encapsulation products [mu4-O)Zn4[(2-C5H4N)-NBz]6] (10b), and [tBu(mu3-O)-Li3(mu6-O)Zn3[(2-C5H4N)NMe]6] (11), respectively, with concomitant oxo-insertion into a Li-C interaction resulting in capping of the fac-isomeric (mu6-O)M3M'3 distorted octahedral core of the latter complex by a tert-butoxide group.

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Section: Resultsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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Oxygen Capture by Lithiated Organozinc Reagents Containing Aromatic 2-Pyridylamide Ligands

et al. 2001

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“…or, equivalently, (54) where K DC is the direct-current (zero frequency) conductivity of the system.…”

Section: Operational Definitions; Recommended Symbols and Terminologymentioning

confidence: 99%

Measurement and Interpretation of Electrokinetic Phenomena (IUPAC Technical Report)

2006

Chemistry International -- Newsmagazine for IUPAC

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Republication or reproduction of this report or its storage and/or dissemination by electronic means is permitted without the Measurement and interpretation of electrokinetic phenomena (IUPAC Technical Report)Abstract: In this report, the status quo and recent progress in electrokinetics are reviewed. Practical rules are recommended for performing electrokinetic measurements and interpreting their results in terms of well-defined quantities, the most familiar being the ζ-potential or electrokinetic potential. This potential is a property of charged interfaces, and it should be independent of the technique used for its determination. However, often the ζ-potential is not the only property electrokinetically characterizing the electrical state of the interfacial region; the excess conductivity of the stagnant layer is an additional parameter. The requirement to obtain the ζ-potential is that electrokinetic theories be correctly used and applied within their range of validity. Basic theories and their application ranges are discussed. A thorough description of the main electrokinetic methods is given; special attention is paid to their ranges of applicability as well as to the validity of the underlying theoretical models. Electrokinetic consistency tests are proposed in order to assess the validity of the ζ-potentials obtained. The recommendations given in the report apply mainly to smooth and homogeneous solid particles and plugs in aqueous systems; some attention is paid to nonaqueous media and less ideal surfaces.

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“…Many studies have focused on electrokinetic behavior in aqueous systems [11][12][13][14][15], but very few works have studied electrokinetic properties of consolidated reservoir rocks in petroleum fluids [3,16]. When electrokinetic measurements are made on reservoir rock cores in low-permittivity liquids, such as hydrocarbon solvents, the ζ -potentials cannot be derived without considering the surface conductivity in the stagnant layer behind the shear plane.…”

Section: Introductionmentioning

confidence: 98%