Ion-Enrichment and Ion-Depletion Effect of Nanochannel Structures

Pu, Qiaosheng; Yun, Ji-Hoon; Temkin, H.; Liu, Shaorong

doi:10.1021/nl0494811

Cited by 499 publications

(490 citation statements)

References 16 publications

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“…For oxide walls, most prominently silica, numerous studies have shown how hydronium affects the electrical properties of the wall-electrolyte interface and leads to a wall surface charge that depends on salt concentration [33][34][35][36][37][38][39][40][41][42][43][44] including our own recent study [26]. Finally, at sufficiently low salt concentration, this surface charge is found to dominate the conductance of electrolyte-filled nanochannels [8,11,19,24,27,28,32,45]. Given these facts, it is remarkable that the role of hydronium ions is largely unexplored in the literature on nanochannel conductance at low salt concentrations in unbuffered solutions.…”

Section: Introductionmentioning

confidence: 50%

“…[19,24,28,45,46] of Table I as well as in Refs. [8,11,27] and summarized by Fig. 8 in a recent review paper [2].…”

Section: Modelmentioning

confidence: 99%

“…Of particular interest is the intricate interplay among surface chemistry, electrokinetics, and fluid dynamics spanning over molecular and continuum macroscopic length scales [4,5]. It has been demonstrated that the electrokinetic properties at this scale have enabled a range of innovations including those for chemical sensing and bioanalytics [6][7][8][9][10][11][12], energy harvesting systems, [13][14][15][16][17][18], and nanofluidic ion transport [19][20][21][22][23][24][25][26], including enrichment, depletion, and rectification effects [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hydronium-dominated ion transport in carbon-dioxide-saturated electrolytes at low salt concentrations in nanochannels

et al. 2011

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Section: Introductionmentioning

confidence: 50%

“…[19,24,28,45,46] of Table I as well as in Refs. [8,11,27] and summarized by Fig. 8 in a recent review paper [2].…”

Section: Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hydronium-dominated ion transport in carbon-dioxide-saturated electrolytes at low salt concentrations in nanochannels

et al. 2011

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“…These effects were first observed at the entrances of nanochannels by Pu et al ͑2004͒, and represent functionalities unique to preconcentrate molecules on a chip. This concept is promising for TAS, because a challenge of miniaturized systems resides in the detection of highly diluted analytes in small volumes of solutions ͑Lichtenberg et al, 2002͒.…”

Section: Preconcentration Of Moleculesmentioning

confidence: 97%

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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“…[1][2][3][4][5][6][7] Previously, researchers have demonstrated that the rectification effect is due to the asymmetric geometric nanopore shape and/or an inhomogeneous charge distribution on the pore wall. 5,[8][9][10][11] The current rectification behavior is correlated with the ionic transport properties inside nanopores, and thus much work has been devoted to study this behavior, in order for designing sophisticated functional nanofluidic devices.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of nanofluidic diodes with polymer nanopores modified by atomic layer deposition

Sheng

Wang

et al. 2014

Biomicrofluidics

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Surface charge distribution is a crucial factor for the ionic transport properties inside nanopores. Modifying the surface charge inside a single conical nanopore can greatly affect the rectification behavior of the ionic current through the nanopore and afford nanofluidic diodes. In this work, we describe a new method to fabricate nanofluidic diodes by atomic layer deposition (ALD) on conical tracketched nanopores. Thorough investigation of the ionic transport behavior through ALD-modified polyethylene terephthalate (PET) nanopores is carried out. Our results demonstrate that ALD is a simple and effective method to modify the inner surface of the polymer nanopores for fabricating nanofluidic devices. In addition, we also investigate the stability of the ALD-modified nanopores, and the results suggest that the long-time stability could be compromised by high voltage applied along the nanopore. V C 2014 AIP Publishing LLC.

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Ion-Enrichment and Ion-Depletion Effect of Nanochannel Structures

Cited by 499 publications

References 16 publications

Hydronium-dominated ion transport in carbon-dioxide-saturated electrolytes at low salt concentrations in nanochannels

Hydronium-dominated ion transport in carbon-dioxide-saturated electrolytes at low salt concentrations in nanochannels

Transport phenomena in nanofluidics

Fabrication of nanofluidic diodes with polymer nanopores modified by atomic layer deposition

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