Cited Article: Majumder M. Nanoscale hydrodynamics - Enhanced flow in carbon nanotubes
Alert Expires: 09 NOV 2010
Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Analysis of pressure-driven electrokinetic flows in hydrophobic microchannels with slip-dependent zeta potential
Authors:
Soong, CY; Hwang, PW; Wang, JC
Author Full Names:
Soong, C. Y.; Hwang, P. W.; Wang, J. C.
Source:
MICROFLUIDICS AND NANOFLUIDICS 9 (2-3): 211-223 AUG 2010
Language:
English
Document Type:
Article
Author Keywords:
Microchannel flow; Electrokinetics; Hydrophobic channel; Slip effect; Apparent zeta potential
KeyWords Plus:
LIQUID FLOW; ELECTROOSMOTIC FLOW; MICROFLUIDICS
Abstract:
The present study is an analysis of pressure-driven electrokinetic flows in hydrophobic microchannels with emphasis on the slip effects under coupling of interfacial electric and fluid slippage phenomena. Commonly used linear model with slip-independent zeta potential and the nonlinear model at limiting (high-K) condition with slip-dependent zeta potential are solved analytically. Then, numerical solutions of the electrokinetic flow model with zeta potential varying with slip length are analyzed. Different from the general notion of "the more hydrophobic the channel wall, the higher the flowrate," the results with slip-independent and slip-dependent zeta potentials both disclose that flowrate becomes insensitive to the wall hydrophobicity or fluid slippage at sufficiently large slip lengths. Boundary slip not only assists fluid motion but also enhances counter-ions transport in EDL and, thus, results in strong streaming potential as well as electrokinetic retardation. With s!
lip-dependent zeta potential considered, flowrate varies non-monotonically with increasing slip length due to competition of the favorable and adverse effects with more complicated interactions. The influence of the slip on the electrokinetic flow is eventually nullified at large slip lengths for balance of the counter effects, and the flowrate becomes insensitive to further hydrophobicity of the microchannel. The occurrence of maximum, minimum, and insensitivity on the flowrate-slip curves can be premature at a higher zeta potential and/or larger electrokinetic separation distance.
Reprint Address:
Soong, CY, Feng Chia Univ, Dept Aerosp & Syst Engn, Taichung 40724, Taiwan.
Research Institution addresses:
[Soong, C. Y.; Hwang, P. W.; Wang, J. C.] Feng Chia Univ, Dept Aerosp & Syst Engn, Taichung 40724, Taiwan
E-mail Address:
cysoong@fcu.edu.tw
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Cited Reference Count:
25
Times Cited:
0
Publisher:
SPRINGER HEIDELBERG; TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY
Subject Category:
Nanoscience & Nanotechnology; Instruments & Instrumentation; Physics, Fluids & Plasmas
ISSN:
1613-4982
DOI:
10.1007/s10404-009-0536-0
IDS Number:
612VJ
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Title:
Gated Ion Transport through Dense Carbon Nanotube Membranes
Authors:
Yu, MA; Funke, HH; Falconer, JL; Noble, RD
Author Full Names:
Yu, Miao; Funke, Hans H.; Falconer, John L.; Noble, Richard D.
Source:
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 132 (24): 8285-8290 JUN 23 2010
Language:
English
Document Type:
Article
KeyWords Plus:
WATER-ADSORPTION; CHANNEL; SELECTIVITY; CONDUCTION
Abstract:
Gated ion diffusion is found widely in hydrophobic biological nanopores, upon changes in ligand binding, temperature, transmembrane voltage, and mechanical stress. Because water is the main media for ion diffusion in these hydrophobic biological pores, ion diffusion behavior through these nanochannels is expected to be influenced significantly when water wettability in hydrophobic biological nanopores is sensitive and changes upon small external changes. Here, we report for the first time that ion diffusion through highly hydrophobic nanopores (similar to 3 nm) showed a gated behavior due to change of water wettability on hydrophobic surface upon small temperature change or ultrasound. Dense carbon nanotube (CNT) membranes with both 3-nm CNTs and 3-nm interstitial pores were prepared by a solvent evaporation process and used as a model system to investigate ion diffusion behavior. Ion diffusion through these membranes exhibited a gated behavior. The ion flux was turned on an!
d off, apparently because the water wettability of CNTs changed. At 298 K, ion diffusion through dense CNT membranes stopped after a few hours, but it dramatically increased when the temperature was increased 20 K or the membrane was subjected to ultrasound. Likewise, water adsorption on dense CNT membranes increased dramatically at a water activity of 0.53 when the temperature increased from 293 to 306 K, indicating capillary condensation. Water adsorption isotherms of dense CNT membranes suggest that the adsorbed water forms a discontinuous phase at 293 K, but it probably forms a continuous layer, probably in the interstitial CNT regions, at higher temperatures. When the ion diffusion channel was opened by a temperature increase or ultrasound, ions diffused through the CNT membranes at a rate similar to bulk diffusion in water. This finding may have implications for using CNT membrane for desalination and water treatment.
Reprint Address:
Falconer, JL, Univ Colorado, Dept Chem & Biol Engn, Boulder, CO 80309 USA.
Research Institution addresses:
[Yu, Miao; Funke, Hans H.; Falconer, John L.; Noble, Richard D.] Univ Colorado, Dept Chem & Biol Engn, Boulder, CO 80309 USA
E-mail Address:
john.falconer@colorado.edu
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Cited Reference Count:
22
Times Cited:
0
Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
Chemistry, Multidisciplinary
ISSN:
0002-7863
DOI:
10.1021/ja9091769
IDS Number:
612NJ
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