Interplay between Nanochannel and Microchannel Resistances

Green, Yoav; Eshel, Ran; Park, Sinwook; Yossifon, Gilad

doi:10.1021/acs.nanolett.6b00429

Cited by 58 publications

(84 citation statements)

References 37 publications

(84 reference statements)

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“…Placing the electrodes much closer to the CSI would reduce this effect, as has been noted for simpler geometries29. These findings are also in line with the recent work of Green et al , who demonstrated the importance of the microchannel resistance for simpler microchannel/nanochannel geometries34.…”

Section: Resultssupporting

confidence: 85%

Observation and experimental investigation of confinement effects on ion transport and electrokinetic flows at the microscale

Benneker

Wood

Tsai

et al. 2016

Sci Rep

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Electrokinetic effects adjacent to charge-selective interfaces (CSI) have been experimentally investigated in microfluidic platforms in order to gain understanding on underlying phenomena of ion transport at elevated applied voltages. We experimentally investigate the influence of geometry and multiple array densities of the CSI on concentration and flow profiles in a microfluidic set-up using nanochannels as the CSI. Particle tracking obtained under chronoamperometric measurements show the development of vortices in the microchannel adjacent to the nanochannels. We found that the direction of the electric field and the potential drop inside the microchannel has a large influence on the ion transport through the interface, for example by inducing immediate wall electroosmotic flow. In microfluidic devices, the electric field may not be directed normal to the interface, which can result in an inefficient use of the CSI. Multiple vortices are observed adjacent to the CSI, growing in size and velocity as a function of time and dependent on their location in the microfluidic device. Local velocities inside the vortices are measured to be more than 1.5 mm/s. Vortex speed, as well as flow speed in the channel, are dependent on the geometry of the CSI and the distance from the electrode.

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Section: Resultssupporting

confidence: 85%

Observation and experimental investigation of confinement effects on ion transport and electrokinetic flows at the microscale

Benneker

Wood

Tsai

et al. 2016

Sci Rep

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“…It is all because the interfacial layer gets increasingly dominant in narrower channels. [126] Particularly, for a straight CNT with two reservoirs, the resistance can be divided into three parts, namely the entry, the exit, and the developed-flow region. As demonstrated by transport theories, the flow rate can be considered as the ratio of the pressure drop and the resistance.…”

Section: Theoretical Description For Nano-confined Water Flowsmentioning

confidence: 99%

“…in series. [126] Particularly, for a straight CNT with two reservoirs, the resistance can be divided into three parts, namely the entry, the exit, and the developed-flow region. Borg et al [40] proposed a resistance model as…”

Section: Theoretical Description For Nano-confined Water Flowsmentioning

confidence: 99%

Structure and Transport Properties of Water and Hydrated Ions in Nano‐Confined Channels

Zhu

Wang

Fan

et al. 2019

Advcd Theory and Sims

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Nano-confined flow is ubiquitous in modern engineering and biomedical applications. As the peculiar phenomena of nano-confined flow were continuously reported and traditional theories failed to describe them accurately, simulation efforts have been made to gain deeper insight. The objective of this paper is to provide an overview of the recent progress on nano-confined flow, including water flow and hydrated ions transport. This report starts with the water behavior under nano-confinement, summarizing the water structures, flow properties and their dependence on wall wettability, channel size, etc. The report also presents the efforts made to modify the existing theories to describe nano-confined flows. Then, the report goes to the hydrated ions. The dehydration process of hydrated ions and ions sieving are discussed in detail, and the effects of membrane surface charge, grafting functional groups, and external field on ions transport are reviewed. In this Progress Report, the transport properties of water and hydrated ions in nano-confined channels are highlighted, which is critical to the design and application of nanofluidic devices, such as nanofiltration membranes, biosensors, and other related fields.

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“…Passage of an Ohmic current through an ion‐selective medium leads to regions of enriched and depleted salt densities at the opposite interfaces of a permselective nanoporous membrane interfacing bulk electrolyte, a phenomenon known as “ion concentration polarization (ICP)” . This physical principle has been the focus of extensive researches since two decades ago, especially with respect to its potential applications in the microfluidic society, for example, on‐chip seawater desalination where the ICP layer is employed to facilitate a dynamic separation of brine and desalted water streams , or improved biomedical assay by electrokinetic preconcentration of charged analytes at the edge of the ion depletion layer due to a force balance between electrophoresis and electroosmosis .…”

Section: Introductionmentioning

confidence: 99%

On ion transport regulation with field‐effect nonlinear electroosmosis control in microfluidics embedding an ion‐selective medium

et al. 2020

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On ion transport regulation with field-effect nonlinear electroosmosis control in microfluidics embedding an ion-selective mediumWe study herein numerically the use of induced-charge electrokinetic phenomena to enable a flexible control of ion transport of dilute electrolyte in a straight ion concentration polarization system. The effect of three convection modes of induced-charge electrokinetic phenomena, including induced-charge electroosmosis, flow-field effect transistor, and alternating-current electroosmosis (ACEO), on convective arrestment of diffusive wave-front propagation is investigated by developing a cross-scale and fully coupled transient numerical simulation model, wherein multiple frequency electrochemical polarization and nonlinear diffuse charge dynamics in spatiotemporally varying solution conductivity are taken into account. We demonstrate by detailed comparative simulation studies that ACEO vortex flow field above a metal strip array arranged along the anodic chamber's bottom surface serves as the most efficient way for adjusting the salt density distribution at micrometer and even millimeter dimension, due to its high flexibility in controlling the stirring flow state with the introduction of two extra electrical parameters. The specific operating status is determined by whether the electrode array is floating in potential (induced-charge electroosmosis) or biased to ground (flow-field effect transistor) or forced to oscillate at another Fourier mode (ACEO). These results prove useful for on-chip electric current control with electroconvective stirring.

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Interplay between Nanochannel and Microchannel Resistances

Cited by 58 publications

References 37 publications

Observation and experimental investigation of confinement effects on ion transport and electrokinetic flows at the microscale

Observation and experimental investigation of confinement effects on ion transport and electrokinetic flows at the microscale

Structure and Transport Properties of Water and Hydrated Ions in Nano‐Confined Channels

On ion transport regulation with field‐effect nonlinear electroosmosis control in microfluidics embedding an ion‐selective medium

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