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Mathematical analysis of effects on the electrostatic double layer of nanoscale surfaces in microfluidic channels
Author(s) -
Aston D. E.,
Berven C. A.,
Williams B. C.,
Basu A.
Publication year - 2012
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20475
Subject(s) - nanopillar , nanowire , microchannel , nanostructure , materials science , microfluidics , electrode , nanofluidics , nanotechnology , nanoscopic scale , substrate (aquarium) , layer (electronics) , fluidics , perpendicular , flow (mathematics) , mechanics , chemistry , physics , geometry , mathematics , aerospace engineering , geology , engineering , oceanography
The effects of microfluidics on the electrostatic double layer (EDL) of a nano‐structured electrode are investigated through numerical modelling. The parameters of interest are the height and spacing of nanostructures, specifically, nanowire and “nanopillar” pairs rising from an idealised sensor substrate perpendicular to the fluid flow. A direct comparison of the EDL thicknesses at the peaks and valleys of this nanostructure are reported for variations in fluid velocity, nanowire spacing, and height under fixed conditions of combined pressure‐driven and electro‐osmotic driving forces. In a microchannel based on the Navier–Stokes and Helmholtz–Smoluchoswki flow models, numerical simulations provide insight into the practical design of chemically selective nanomaterial electrodes for potentiometric detection of ions in water.