Document Detail


Ion correlations in nanofluidic channels: effects of ion size, valence, and concentration on voltage- and pressure-driven currents.
MedLine Citation:
PMID:  23286510     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The effects of ion-ion and ion-wall correlations in nanochannels are explored, specifically how they influence voltage- and pressure-driven currents and pressure-to-voltage energy conversion. Cations of different diameters (0.15, 0.3, and 0.9 nm) and different valences (+1, +2, and +3) at concentrations ranging from 10(-6) M to 1 M are considered in 50-nm- and 100-nm-wide nanoslits with wall surface charges ranging from 0 C/m(2) to -0.3 C/m(2). These parameters are typical of nanofluidic devices. Ion correlations have significant effects on device properties over large parts of this parameter space. These effects are the result of ion layering (oscillatory concentration profiles) for large monovalent cations and charge inversion (more cations in the first layer near the wall than necessary to neutralize the surface charge) for the multivalent cations. The ions were modeled as charged, hard spheres using density functional theory of fluids, and current was computed with the Navier-Stokes equations with two different no-slip conditions.
Authors:
Jordan Hoffmann; Dirk Gillespie
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2013-01-15
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  29     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-01-29     Completed Date:  2013-07-08     Revised Date:  2014-03-19    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1303-17     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Calcium / chemistry*
Cations, Divalent
Cations, Monovalent
Computer Simulation
Electric Conductivity
Hydrogen-Ion Concentration
Microfluidics*
Models, Chemical
Nanotechnology*
Pressure
Quantum Theory
Sodium / chemistry*
Static Electricity
Thermodynamics
Grant Support
ID/Acronym/Agency:
R01 AR054098/AR/NIAMS NIH HHS; R01-AR054098/AR/NIAMS NIH HHS
Chemical
Reg. No./Substance:
0/Cations, Divalent; 0/Cations, Monovalent; 9NEZ333N27/Sodium; SY7Q814VUP/Calcium
Comments/Corrections

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