A Model for the Shift of Isoelectric Points of Oxides in Concentrated and Mixed-Solvent Electrolyte Solutions

Yaroshchuk, Andriy

doi:10.1006/jcis.2001.7518

Cited by 13 publications

(8 citation statements)

References 6 publications

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“…10͒; this behavior is exploited in membrane science for filtration purposes. The Donnan effect can be enhanced using species with high ion valence ͑Chaufer et Yaroshchuk, 2001b͒ or specific surface coatings ͑Hollman and Bhattacharyya, 2004͒.…”

Section: ͑42͒mentioning

confidence: 99%

“…This could be a problem for nanometer-sized apertures, since 10 nm of glass are dissolved in 28 h. In fact, the interaction between water and the silica network is not limited to the surface, but can also occur behind the glass-water interface ͑Scholze, 1988͒, resulting in a loose, swelled, and unstructured layer at the surface of glass that is denoted as a silica gel. Compared to bulk glass, this gel layer has an enhanced ion mobility, lower electric resistance, different Si-O bond lengths, and faster dehydration ͑Wikby, 1974; Yaroshchuk, 2001a͒. The long-term stability and controllability of glass is therefore limited, but can be improved with surface pretreatment ͑Hench and Clark, 1978; Dilmore et al, 1979͒ or Schwarz and Schonhoff, 2002;Huebsch et al, 2004;Lulevich and Vinogradova, 2004;Poptoshev et al, 2004;Sui and Schlenoff, 2004;Lee et al, 2006͒.…”

Section: Fabrication Of Nanochannelsmentioning

confidence: 99%

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Transport phenomena in nanofluidics

2008

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The transport of fluid in and around nanometer-sized objects with at least one characteristic dimension below 100 nm enables the occurrence of phenomena that are impossible at bigger length scales. This research field was only recently termed nanofluidics, but it has deep roots in science and technology. Nanofluidics has experienced considerable growth in recent years, as is confirmed by significant scientific and practical achievements. This review focuses on the physical properties and operational mechanisms of the most common structures, such as nanometer-sized openings and nanowires in solution on a chip. Since the surface-to-volume ratio increases with miniaturization, this ratio is high in nanochannels, resulting in surface-charge-governed transport, which allows ion separation and is described by a comprehensive electrokinetic theory. The charge selectivity is most pronounced if the Debye screening length is comparable to the smallest dimension of the nanochannel cross section, leading to a predominantly counterion containing nanometer-sized aperture. These unique properties contribute to the charge-based partitioning of biomolecules at the microchannel-nanochannel interface. Additionally, at this free-energy barrier, size-based partitioning can be achieved when biomolecules and nanoconstrictions have similar dimensions. Furthermore, nanopores and nanowires are rooted in interesting physical concepts, and since these structures demonstrate sensitive, label-free, and real-time electrical detection of biomolecules, the technologies hold great promise for the life sciences. The purpose of this review is to describe physical mechanisms on the nanometer scale where new phenomena occur, in order to exploit these unique properties and realize integrated sample preparation and analysis systems.

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Section: ͑42͒mentioning

confidence: 99%

Section: Fabrication Of Nanochannelsmentioning

confidence: 99%

Transport phenomena in nanofluidics

2008

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“…On the other hand, a shift in the IEP of metal oxides was observed experimentally even for indifferent electrolytes [5] at high ionic strengths. This behavior was explained theoretically by Yaroshchuk [6]. It was reported that the variation of the rheological properties of slurry, for example, viscosity and shear stress, has a local maximum as pH varied, and this maximum occurs at IEP under pristine conditions [7][8][9].…”

Section: Introductionmentioning

confidence: 94%

An experimental study on the rheological properties of aqueous ceria dispersions

Hsu

Nacu

2004

Journal of Colloid and Interface Science

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“…Namely, the ability of particular salts to induce a shift in the IEP of oxides is correlated with Marcus' structure breaking and making scale of anions and cations (13). This was experimentally observed for anatase (also for alumina and zirconia, but with only a few salts) and confirmed by recent theoretical analysis (14).…”

Section: Introductionmentioning

confidence: 65%