The ζ-Potential of Glass Surface in Contact with Aqueous Solutions

Gu, Yongan; Li, Dongqing

doi:10.1006/jcis.2000.6827

Cited by 168 publications

(134 citation statements)

References 18 publications

(45 reference statements)

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“…Using Derjaguin approximation, the total double-layer energy, E T e , between the hemisphericalasperity-coated silica sphere and air bubble surface becomes [26]: [29][30][31][32][33]. It should be noted that Equation (4) works best when the closest distance (i.e., h − r) is greater than several Debye lengths due to the linear approximation treatment [26].…”

Section: Theoretical Modelmentioning

confidence: 99%

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

et al. 2017

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A theoretical analysis was conducted to study the role of collectors and depressants in flotation, based on the extended Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, where the hydrophobic force is considered. The collector-coated hydrophilic particle and the depressant-coated hydrophobic particle are simplified to a sphere uniformly covered with respectively hydrophobic and hydrophilic nanometer-sized hemispherical asperities of identical radius. Results show that the role of a collector in bubble-particle attachment is to create an attractive hydrophobic force and thus overcome the repulsive van der Waals and electrostatic forces. Moreover, increasing the length of the hydrophobic part of the collector molecule is a more effective way to enhance flotation recovery, compared to increasing the collector concentration. For a depressant, however, its function mechanism is to create a strong electrostatic double-layer force, while the suppression of the hydrophobic force plays a secondary role in decreasing the bubble-particle attachment barrier. The depressant molecule length is also a dominant parameter in designing a powerful depressant.

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Section: Theoretical Modelmentioning

confidence: 99%

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

et al. 2017

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“…The results of 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 10 these two models are compared to show the differences in concentration field, electric field and velocity field. In the constant model, the relative dielectric constant of pure water is set to be 78 at 25 , the zeta potential of the glass-water interface takes the value of 62.6mV as measured by Gu and Li [26]. The electric conductivity of pure water is 0.055…”

Section: Two Modelsmentioning

confidence: 99%

“…The higher the ionic concentration, the lower zeta potential value. Figure 4 by Gu and Li [26]. For the channel wall on the stream 2 side, the calculated zeta potential by Eq.…”

Section: Zeta Potentialmentioning

confidence: 99%

Effects of ionic concentration gradient on electroosmotic flow mixing in a microchannel

Peng

2015

Journal of Colloid and Interface Science

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Effects of ionic concentration gradient on electroosmotic flow (EOF) mixing of one stream of a high concentration electrolyte solution with a stream of a low concentration electrolyte solution in a micrichannel are investigated numerically. The concentration field, flow field and electric field are strongly coupled via concentration dependent zeta potential, dielectric constant and electric conductivity. The results show that the electric field and the flow velocity are nonuniform when the concentration dependence of these parameters is taken into consideration. It is also found that when the ionic concentration of the electrolyte solution is higher than 1M, the electrolyte solution essentially cannot enter the channel due to the extremely low electroosmotic flow mobility. The effects of the concentration dependence of zeta potential, dielectric constant and electric conductivity on electroosmotic flow mixing are studied.

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“…It is evident from Figure 2 that a point of zero charge (pzc) is not achieved over the pH range investigated. However this is not completely unexpected as work done by Gu et al [1] on calculating the Zeta potential of glass microscope slides reviled that even at a pH as low as 2.68 a pzc wasn't observed.…”

Section: Zeta Potential Of Glass Micorscope Slidementioning

confidence: 96%

“…Ions of opposite charge within the liquid medium are attracted to the surface in order to neutralize the surface charge creating what is commonly referred to as an electric double layer (EDL). The strength and polarity of the EDL is represented by the parameter known as the Zeta potential [1]. The Zeta potential is a useful parameter for determining electrokinetic chemical properties of both pristine and modified surfaces.…”

Section: Introductionmentioning

confidence: 99%

Streaming Zeta Potential Measurements Of Surface- Bound Organosilane Molecular Species

Wright

Flavel

Quinton

2006

2006 International Conference on Nanoscience and Nanotechnology

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Abstract-Surface modification is frequently adopted to alter a given objects ability to fit to its purpose. One such method is through modification by adsorbed molecular species, such as for self-assembled monolayers (SAMs). In this paper we present data showing how Streaming Zeta measurements can be used as a complimentary technique to Atomic Force Microscopy for characterisation of a surface that has been subject to molecular modification.

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The ζ-Potential of Glass Surface in Contact with Aqueous Solutions

Cited by 168 publications

References 18 publications

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

Role of Collectors and Depressants in Mineral Flotation: A Theoretical Analysis Based on Extended DLVO Theory

Effects of ionic concentration gradient on electroosmotic flow mixing in a microchannel

Streaming Zeta Potential Measurements Of Surface- Bound Organosilane Molecular Species

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