A novel method of measuring electrophoretic mobility of gas bubbles

Najafi, Aref Seyyed; Drelich, Jaroslaw; Yeung, Anthony; Xu, Zhenghe; Masliyah, Jacob H.

doi:10.1016/j.jcis.2007.01.014

Cited by 137 publications

(100 citation statements)

References 23 publications

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“…According to results presented in Figure 6, the isoelectric point of the argon/water interface was found to be pH iep = 3.9 at lower ionic strength of 10 -3 mol dm -3 and was shifted to pH iep = 3.4 at ionic strength of 10 -2 mol dm -3 . Bubbling potential results agree with the data obtained by the electrophoresis: Takahashi 5 found pH iep ≈ 4.3; Yang et al 6 measured pH iep ≈ 3.2 (at different concentrations of sodium chloride); Najafi et al 7 found that pH iep ≈ 2.3.…”

Section: Discussionsupporting

confidence: 85%

“…Comparison of measured bubbling potentials ( Figure 6) and electrokinetic data as found in literature 5,7,24,25 clearly suggests that the bubbling potentials is somehow related, to electrokinetic -potentials. The bubbling potential is zero at the isoelectric point and follows the pattern of electrokinetic potential being significantly lower in value.…”

Section: Discussionsupporting

confidence: 71%

“…However, an interface is never a simple system, especially when water is considered. [1][2][3][4] It is agreed that interfacial water at inert surfaces, such as gas, [5][6][7] ice, 8 hydrocarbon oil, 9 diamond 10 and Teflon, 11 exhibit electrical surface charge. Although the results of numerical simulations and calculations [12][13][14][15][16][17] suggest positive surface charge, the experimental results obtained with different experimental techniques i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Although the results of numerical simulations and calculations [12][13][14][15][16][17] suggest positive surface charge, the experimental results obtained with different experimental techniques i.e. electrophoresis, [5][6][7] surface tension, 18 spectroscopy, 19 indicate pH-dependent surface charge being negative in the pH region above pH = 4. This controversy is still not solved.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Bubbling on the Potential of Reference Electrode

Kallay¹,

Lovrak²,

Preočanin³

et al. 2013

Croat. Chem. Acta

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Abstract. The method for the examination of gas/water interface electrokinetic behavior is developed. "Bubbling potential", i.e. the difference in the potential of the indicator electrode in the absence and presence of gas bubbles was measured. The indicator electrode is a reference electrode with the porous plug exposed to gas bubbles. The charged bubble in contact with the porous plug would affect the potential of the indicator electrode. However, electrodes, whose potential depends on the reversible interfacial reaction, would be relaxed due to the interfacial ionic equilibration and their potential will not be affected by the presence of bubbles. Measured Bubbling potentials are directly related to electrokinetic -potentials.The proposed method is fast, accurate and reproducible so that it can be used for the examination of gas/water interfaces in different conditions. The isoelectric point of argon bubbles in the aqueous NaCl solution was obtained as pH iep = 3.9 and pH iep = 3.4 at ionic strength of 10 -3 and 10 -2 mol dm -3 , respectively. (doi: 10.5562/cca2235)

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Section: Discussionsupporting

confidence: 85%

Section: Discussionsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Bubbling on the Potential of Reference Electrode

Kallay¹,

Lovrak²,

Preočanin³

et al. 2013

Croat. Chem. Acta

View full text Add to dashboard Cite

show abstract

“…4 Tabe et al calculated the acid-base equilibrium constant (pKa) of trimethylamine at the water surface with quantum mechanics/molecular mechanics and thermodynamic integration calculations, and elucidated the observed pKa shift at the water surface. 5 Electrophoresis 6,7 and electrospray mass spectrometry 8 were also reported to show that at the air/water interface, pH is more basic than that in bulk solution.…”

Section: Introductionmentioning

confidence: 99%

Estimating pH at the Air/Water Interface with a Confocal Fluorescence Microscope

2015

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One way to determine the pH at the air/water interface with a confocal fluorescence microscope has been proposed. The relation between the pH at the air/water interface and that in a bulk solution has been formulated in connection with the adsorption equilibrium and the dissociation equilibrium of the dye adsorbed. Rhodamine B (RhB) is used as a surfaceactive fluorescent pH probe. The corrected fluorescence spectrum of RhB molecules at the air/water interface with the surface density of 1.0 nmol m -2 level shows pH-dependent shifts representing an acid-base equilibrium. Two ways to determine the unknown acid-base equilibrium constant of RhB molecules at the air/water interface have been discussed. With surface-tension measurements, the adsorption properties, maximum surface density, and adsorption equilibrium constants were estimated for both cationic and zwitterionic forms of RhB molecules at the air/water interface.

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Basic Characterization of Nanobubbles and their Potential Applications

Oshita¹,

Uchida²

2013

Bio‐Nanotechnology

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A novel method of measuring electrophoretic mobility of gas bubbles

Cited by 137 publications

References 23 publications

Effect of Bubbling on the Potential of Reference Electrode

Effect of Bubbling on the Potential of Reference Electrode

Estimating pH at the Air/Water Interface with a Confocal Fluorescence Microscope

Basic Characterization of Nanobubbles and their Potential Applications

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