Particle Zeta Potentials Remain Finite in Saturated Salt Solutions

Garg, Astha; Cartier, Charles A.; Bishop, Kyle J. M.; Velegol, Darrell

doi:10.1021/acs.langmuir.6b02824

Cited by 32 publications

(22 citation statements)

References 43 publications

(76 reference statements)

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“…The fit of the solid curve to the experimental data are quite good for C > 0.1 M, which is remarkable because the Gouy-Chapman equation used to derive [7] assumes a thermodynamically ideal solution; this is unlikely to be valid for such large concentrations of NaCl. A similar conclusion was reached by Garg et al (45).…”

Section: Resultssupporting

confidence: 87%

Diffusiophoresis of charged colloidal particles in the limit of very high salinity

Prieve

Malone

Khair

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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Diffusiophoresis is the migration of a colloidal particle through a viscous fluid, caused by a gradient in concentration of some molecular solute; a long-range physical interaction between the particle and solute molecules is required. In the case of a charged particle and an ionic solute (e.g., table salt, NaCl), previous studies have predicted and experimentally verified the speed for very low salt concentrations at which the salt solution behaves ideally. The current study presents a study of diffusiophoresis at much higher salt concentrations (approaching the solubility limit). At such large salt concentrations, electrostatic interactions are almost completely screened, thus eliminating the long-range interaction required for diffusiophoresis; moreover, the high volume fraction occupied by ions makes the solution highly nonideal. Diffusiophoretic speeds were found to be measurable, albeit much smaller than for the same gradient at low salt concentrations.

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Section: Resultssupporting

confidence: 87%

Diffusiophoresis of charged colloidal particles in the limit of very high salinity

Prieve

Malone

Khair

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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“…It shows that the zeta-potential increases with the increasing Na + concentration to about − 9 mV in the tested range. This is in consistent with the phenomenon that the zeta-potential of colloid at high salt concentration as a finite value 2 . The increase of zeta-potential in Na + solution is mainly due to the suppression of the double electric layer as the increase of ionic strength in the solution.…”

Section: Resultssupporting

confidence: 90%

“…As the surface charge is hard to be determined directly, zeta potential measurements are most commonly applied to quantify the electrostatic properties of carbonate rock surfaces and oil droplets in solutions. The quantitative changes in the magnitude of surface charge can result in correspondent changes in the zeta potentials 2 , 3 . It was reported that the zeta-potential of carbonate minerals was reported to show different trend from the clastic minerals in low salinity brines 4 .…”

Section: Introductionmentioning

confidence: 99%

Manipulation of surface charges of oil droplets and carbonate rocks to improve oil recovery

Hou¹,

Han

Wang

2021

Sci Rep

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This work investigates the effect of the surface charges of oil droplets and carbonate rocks in brine and in surfactant solutions on oil production. The influences of the cations in brine and the surfactant types on the zeta-potentials of both oil droplets and carbonate rock particles are studied. It is found that the addition of anionic and cationic surfactants in brine result in both negative or positive zeta-potentials of rock particles and oil droplets respectively, while the zwitterionic surfactant induces a positive charge on rock particles and a negative charge on oil droplets. Micromodels with a CaCO3 nanocrystal layer coated on the flow channels were used in the oil displacement tests. The results show that when the oil-water interfacial tension (IFT) was at 10−1 mN/m, the injection of an anionic surfactant (SDS-R1) solution achieved 21.0% incremental oil recovery, higher than the 12.6% increment by the injection of a zwitterionic surfactant (SB-A2) solution. When the IFT was lowered to 10−3 mM/m, the injection of anionic/non-ionic surfactant SMAN-l1 solution with higher absolute zeta potential value (ζoil + ζrock) of 34 mV has achieved higher incremental oil recovery (39.4%) than the application of an anionic/cationic surfactant SMAC-l1 solution with a lower absolute zeta-potential value of 22 mV (30.6%). This indicates that the same charge of rocks and oil droplets improves the transportation of charged oil/water emulsion in the porous media. This work reveals that the surface charge in surfactant flooding plays an important role in addition to the oil/water interfacial tension reduction and the rock wettability alteration.

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“…Saturated zeta potential measurements have been reported using an ultrasound technique 40 but in prohibitively large volumes for valuable manufactured or field-collected samples. Imaging velocimetry under a microscope has been reported 41 but this technique measures small numbers of micron-scaled particles yielding a statistically poor sample from the parent population and missing the nano-scale completely. Further still, in order to detect the residual electrophoretic mobility in high molarities from which zeta potential is calculated and which, as we report in this work, tend to be rather low in magnitude, a potential difference across the cell must be applied for periods long enough that the images of the particles explore a region of the detector plane larger than the Rayleigh resolution of the imaging microscope.…”

mentioning

confidence: 99%

Routine, ensemble characterisation of electrophoretic mobility in high and saturated ionic dispersions

Austin¹,

Fernandes²,

Ruszala³

et al. 2020

Sci Rep

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With the industrialisation of nanoparticle manufacture, the pervasive incursion of nanoparticles into the environment, the need to characterise nano-scale pharmaceuticals and living systems in replicated in vivo conditions, the continuing development of new theories to describe the electro-kinetic behaviour of nano-particles in representative ionic strengths and numerous other applications, there is an urgent requirement to provide simple and effective experimental tools to validate these models and explore new systems. Micro-electrophoresis implemented with a diffusion barrier, which isolates the dispersed phase from the electrode surface, is demonstrated as enabling such measurements for the first time, preventing the catastrophic outgassing, precipitation and sample degradation observed when the dispersed phase is in close proximity to the electrode surface. Using a measurement of a few minute's duration in a standard laboratory light scattering instrument we reproduce the theoretically predicted phenomena of asymptotic, non-zero electrophoretic mobility with increasing ionic strength, the cationic Hofmeister series dependency, charge inversion and a continuously decreasing variation in mobility with pH as molarity increases. Standard operating procedures are developed and included to encourage further work. The action and interaction of colloidal or nano-scaled biological nano-or micro-scaled particles dispersed in a continuous liquid phase is of significant interest in a range of applications 1-8 and in particular there is urgent interest in the behaviour of bio-particles in living systems, such as proteins and lipids 9-12 , the targeted delivery of otherwise toxic pharmaceuticals by encapsulation to avoid a negative response from the immune system 13-16 , the behaviour of naturally occurring colloids 17-19 and the incursion and removal of manufactured nano-scale to micro-scale particles into the environment 20-24 and thence, also into living organisms 25-29. A key indicator of the stability of colloidal and protein dispersions is the particle zeta potential 30. On immersion into aqueous media, charged ionic species gather at the particle surface, creating a complex layer of charges known as the electrical double layer (EDL), comprising of a stationary layer of species adsorbed, chemically bound, to the particle surface and around this inner layer, a diffuse layer attracted via Coulombic interactions, which acts to minimise the total energy in the system by screening the first layer. The electric potential at the hydrodynamic slipping plane within the diffuse layer is defined as the zeta potential and is an indicator of how the dispersed phase is to interact with itself and its surroundings over time. For instance, DLVO theory 30 describes how dispersed particles interact with each other as their EDL's overlap with an attractive Van der Waals and repulsive Coulombic potential interaction assumed, whose sum creates a pair of sequentially deeper potential wells as the particles approach one another. Within the...

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Particle Zeta Potentials Remain Finite in Saturated Salt Solutions

Cited by 32 publications

References 43 publications

Diffusiophoresis of charged colloidal particles in the limit of very high salinity

Diffusiophoresis of charged colloidal particles in the limit of very high salinity

Manipulation of surface charges of oil droplets and carbonate rocks to improve oil recovery

Routine, ensemble characterisation of electrophoretic mobility in high and saturated ionic dispersions

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