Electrokinetics of the silica and aqueous electrolyte solution interface: Viscoelectric effects

Hsu, Wei-Lun; Daiguji, Hirofumi; Dunstan, Dave E.; Davidson, Malcolm R.; Harvie, Dalton J. E.

doi:10.1016/j.cis.2016.05.001

Cited by 42 publications

(51 citation statements)

References 143 publications

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“…Hsu et al. [18] considered viscoelectric effects in EDL models via computational simulations, following the viscoelectic coefficient estimated by Lyklema and Overbeek, and quantitatively obtained experimental measurements of four classical electrokinetic phenomena: electrophoresis, electroosmosis, streaming potential, and streaming current [18]. They reached a consistent conclusion for streaming potential and streaming current: the measured electrokinetic quantities are independent of the surface charge (potential) as the electric field at the interface is higher than a critical value.…”

Section: History and Backgroundmentioning

confidence: 99%

“…v , E , and ρ e denote the velocity, electric field in EDL, and space charge density, respectively. The figure has been reprinted from [18].…”

Section: History and Backgroundmentioning

confidence: 99%

“…The key role in this pumping phenomenon is played by the electrically charged solid-liquid interface, the so-called electrical double layer (EDL). The EDL, which is a composition of charged solid surface and a very tiny layer of counter-charges in an aqueous solution (around a few nanometers), was first investigated in the 19th century [12], and has been further studied in the 20th century [13][14][15] and in contemporary times [16][17][18][19][20]. Consequently, it is of utmost importance to enhance our understanding of the configuration of water and ionic species in the vicinity of an electrically charged solid surface.…”

Section: Introductionmentioning

confidence: 99%

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Electroosmotic flow: From microfluidics to nanofluidics

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Electroosmotic flow (EOF), a consequence of an imposed electric field onto an electrolyte solution in the tangential direction of a charged surface, has emerged as an important phenomenon in electrokinetic transport at the micro/nanoscale. Because of their ability to efficiently pump liquids in miniaturized systems without incorporating any mechanical parts, electroosmotic methods for fluid pumping have been adopted in versatile applications—from biotechnology to environmental science. To understand the electrokinetic pumping mechanism, it is crucial to identify the role of an ionically polarized layer, the so‐called electrical double layer (EDL), which forms in the vicinity of a charged solid–liquid interface, as well as the characteristic length scale of the conducting media. Therefore, in this tutorial review, we summarize the development of electrical double layer models from a historical point of view to elucidate the interplay and configuration of water molecules and ions in the vicinity of a solid–liquid interface. Moreover, we discuss the physicochemical phenomena owing to the interaction of electrical double layer when the characteristic length of the conducting media is decreased from the microscale to the nanoscale. Finally, we highlight the pioneering studies and the most recent works on electro osmotic flow devoted to both theoretical and experimental aspects.

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Section: History and Backgroundmentioning

confidence: 99%

“…v , E , and ρ e denote the velocity, electric field in EDL, and space charge density, respectively. The figure has been reprinted from [18].…”

Section: History and Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electroosmotic flow: From microfluidics to nanofluidics

et al. 2021

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“…p values are available in different solvents for a number of surface groups: different elements coordinating to the surface hydroxide affect its acidity/basicity, although different measurement methods may measure different parameters, leading to apparent variation in the p values. 31 One of the best-studied cases, that of silanol groups on silica surfaces, is complex: there can be a number of differently coordinated groups present, 55 and the p values range from 4.5 to 9.2. [56][57][58][59] Singly coordinated aluminium hydroxide groups, 'Al-OH' are reported to have a p value of 10 in gibbsite or 7 in kaolinite.…”

Section: Acid-base Titrationsmentioning

confidence: 99%

Surface Chemistry of Almandine Garnet

et al. 2020

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Almandine garnet is commonly used in abrasive blasting processes to prepare metallic surfaces for painting. However, there is evidence that the process leads to significant amounts of abrasive embedded in the 'cleaned' surface, and hence the surface chemistry of garnet will affect the binding of any coatings subsequently applied. In addition, in marine environments seawater aerosol droplets are expected to impact the exposed surface prior to coating application, depositing both water and dissolved inorganic ions. In this work, we provide in-depth analysis of the chemistry of the almandine garnet surface using angle-resolved X-ray photoelectron spectroscopy (XPS) and note a correlation for several elemental oxides between literature values of the binding energy of the surface oxygen 1s XPS peak and the basicity of the hydroxyl group that forms on the surface.We also consider the adsorption to almandine garnet powder of seawater-relevant inorganic ions (sodium, magnesium, and calcium): Binding constants have been determined using titration measurements, solution-depletion isotherms, and numerical modelling, with calcium observed to bind more strongly than magnesium. The relevance of Langmuir-type fits to constant-pH adsorption isotherms is discussed. By contrast, sodium either binds very weakly or is effectively inert towards 2 the garnet surface under the experimental conditions. The complex adsorption behaviour observed emphasizes the necessity of using multiple techniques to characterize mineral surfaces.

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“…This implies that the surface charge density is a prescribed parameter, instead of being obtained as functions of the material and solution properties. However, it is known that the surface charge density of the nanopore membrane is highly pH dependent due to the chemical equilibrium reactions on the pore wall . Solution pH is a key parameter used for regulation of the nanopore surface charge density in nanofluidic applications .…”

Section: Introductionmentioning

confidence: 99%

Anomalous pH‐Dependent Nanofluidic Salinity Gradient Power

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Chen

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et al. 2017

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Previous studies on nanofluidic salinity gradient power (NSGP), where energy associated with the salinity gradient can be harvested with ion-selective nanopores, all suggest that nanofluidic devices having higher surface charge density should have higher performance, including osmotic power and conversion efficiency. In this manuscript, this viewpoint is challenged and anomalous counterintuitive pH-dependent NSGP behaviors are reported. For example, with equal pH deviation from its isoelectric point (IEP), the nanopore at pH < IEP is shown to have smaller surface charge density but remarkably higher NSGP performance than that at pH > IEP. Moreover, for sufficiently low pH, the NSGP performance decreases with lowering pH (increasing nanopore charge density). As a result, a maximum osmotic power density as high as 5.85 kW m can be generated along with a conversion efficiency of 26.3% achieved for a single alumina nanopore at pH 3.5 under a 1000-fold concentration ratio. Using the rigorous model with considering the surface equilibrium reactions on the pore wall, it is proved that these counterintuitive surface-charge-dependent NSGP behaviors result from the pH-dependent ion concentration polarization effect, which yields the degradation in effective concentration ratio across the nanopore. These findings provide significant insight for the design of next-generation, high-performance NSGP devices.

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Electrokinetics of the silica and aqueous electrolyte solution interface: Viscoelectric effects

Cited by 42 publications

References 143 publications

Electroosmotic flow: From microfluidics to nanofluidics

Electroosmotic flow: From microfluidics to nanofluidics

Surface Chemistry of Almandine Garnet

Anomalous pH‐Dependent Nanofluidic Salinity Gradient Power

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