An Improved Method for Calculating Zeta-Potentials from Measurements of the Electrokinetic Sonic Amplitude

Löbbus, Mario; Sonnfeld, Jürgen; Leeuwen, Herman P. van; Vogelsberger, Wolfram; Lyklema, J.

doi:10.1006/jcis.2000.6980

Cited by 37 publications

(22 citation statements)

References 34 publications

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“…The value of 2.4 for q shown by the 1 mM system at 23.5°C corresponds to K s i /K s d ) 1.4, and if there is more charge inside than outside the shear surface in the diffuse layer, then this is in general agreement with the results obtained in previous studies in which the conductivity of the inner-layer ions is somewhat lower than that of the ions in the diffuse double layer. 24 For the 10 mM system, K s i /K s d ) 0.5, suggesting again that the mobility of the inner-layer ions is not as high as those in the diffuse part of the double layer.…”

Section: Discussionmentioning

confidence: 94%

Electroacoustic Study of the Crystallization of n-Eicosane Oil-in-Water Emulsions

2003

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When sodium dodecyl sulfate-stabilized emulsions of n-eicosane are supercooled from about 40°C, solidification of the droplets occurs below 24°C; reheating the suspension causes the particles to melt at the normal melting point of 36-37°C, and the emulsion returns to its initial state without any aggregation or coalescence observed. The crystallization changes the density of the particles and the volume fraction of the suspension. When this is properly considered, the dynamic mobility spectra obtained from electroacoustic measurements can be readily interpreted in terms of the particle size and potential of the droplets with very low fit errors. The droplet size appears, however, to be significantly different at different salt concentrations. This anomalous result is an indication of stagnant layer conduction on the emulsion drops. When this effect is also taken into account, the droplet size becomes independent of the salt concentration. The results then become entirely self-consistent and indicate that the theory, which is used to describe the dynamic mobility, appropriately describes the effect for both solid particles and surfactant-stabilized oil droplets.

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Section: Discussionmentioning

confidence: 94%

Electroacoustic Study of the Crystallization of n-Eicosane Oil-in-Water Emulsions

2003

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“…The calculated Levine number is b = 7.47. The Stern layer conductance is assumed to be s Stern = 1 nS, as measured by Löbbus et al [30] in a 1 mM KCl solution at pH 7.4. A MATLAB program (see the Supporting Information) was written to implement the calculations.…”

Section: Resultsmentioning

confidence: 99%

“…It is acknowledged that our Dukhin number is different from the traditional definition in which the numerator is the total surface conductance (i.e., the conductance through both the inner Stern layer and outer diffuse layer) instead of the current Stern layer conductance [29,30]. Combining Eqs.…”

Section: Thermodynamic Analysismentioning

confidence: 99%

Effects of Stern layer conductance on electrokinetic energy conversion in nanofluidic channels

Davidson

Xuan

2008

Electrophoresis

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A thermo-electro-hydro-dynamic model is developed to analytically account for the effects of Stern layer conductance on electrokinetic energy conversion in nanofluidic channels. The optimum electrokinetic devices performance is dependent on a figure of merit, in which the Stern layer conductance appears as a nondimensional Dukhin number. Such surface conductance is found to significantly reduce the figure of merit and thus the efficiency and power output. This finding may explain why the recently measured electrokinetic devices performances are far below the theoretical predictions where the effects of Stern layer conductance have been ignored.

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“…However, according to many experimental results, the zeta potential has poor reproducibility [40], particularly because there is an important contribution of the hydrodynamic conditions to the ζ values [39,41]. An important factor is the control of the experimental mixing conditions and the particle size [42], due to charge transport resulting from the flux dynamics [43].…”

Section: Surface Chargementioning

confidence: 97%

“…The zeta potential (ζ ) is the most appropriate variable to describe systems consisting of charged particles and ionic species in solution [39]. However, according to many experimental results, the zeta potential has poor reproducibility [40], particularly because there is an important contribution of the hydrodynamic conditions to the ζ values [39,41].…”

Section: Surface Chargementioning

confidence: 99%

Passivation of the calcite surface with phenylmalonate and benzylmalonate ions

Salinas-Nolasco

Méndez-Vivar

Lara

et al. 2005

Journal of Colloid and Interface Science

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An Improved Method for Calculating Zeta-Potentials from Measurements of the Electrokinetic Sonic Amplitude

Cited by 37 publications

References 34 publications

Electroacoustic Study of the Crystallization of n-Eicosane Oil-in-Water Emulsions

Electroacoustic Study of the Crystallization of n-Eicosane Oil-in-Water Emulsions

Effects of Stern layer conductance on electrokinetic energy conversion in nanofluidic channels

Passivation of the calcite surface with phenylmalonate and benzylmalonate ions

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