Cited Article: Majumder M. Nanoscale hydrodynamics - Enhanced flow in carbon nanotubes
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Title:
Ion exclusion by sub-2-nm carbon nanotube pores
Authors:
Fornasiero, F; Park, HG; Holt, JK; Stadermann, M; Grigoropoulos, CP; Noy, A; Bakajin, O
Author Full Names:
Fornasiero, Francesco; Park, Hyung Gyu; Holt, Jason K.; Stadermann, Michael; Grigoropoulos, Costas P.; Noy, Aleksandr; Bakajin, Olgica
Source:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 105 (45): 17250-17255 NOV 11 2008
Language:
English
Document Type:
Article
Author Keywords:
biomimetic platform; ion channel; ion transport; nanofiltration
Keywords Plus:
CHEMICAL FORCE MICROSCOPY; INORGANIC METAL-CATIONS; POTASSIUM CHANNEL; CRYSTAL-STRUCTURE; PROTON TRANSLOCATION; MEMBRANE EQUILIBRIA; EXTRACELLULAR LOOP; TRANSPORT; WATER; PERMEATION
Abstract:
Biological pores regulate the cellular traffic of a large variety of solutes, often with high selectivity and fast flow rates. These pores share several common structural features: the inner surface of the pore is frequently lined with hydrophobic residues, and the selectivity filter regions often contain charged functional groups. Hydrophobic, narrow-diameter carbon nanotubes can provide a simplified model of membrane channels by reproducing these critical features in a simpler and more robust platform. Previous studies demonstrated that carbon nanotube pores can support a water flux comparable to natural aquaporin channels. Here, we investigate ion transport through these pores using a sub-2-nm, aligned carbon nanotube membrane nanofluidic platform. To mimic the charged groups at the selectivity region, we introduce negatively charged groups at the opening of the carbon nanotubes by plasma treatment. Pressure-driven filtration experiments, coupled with capillary electropho!
resis analysis of the permeate and feed, are used to quantify ion exclusion in these membranes as a function of solution ionic strength, pH, and ion valence. We show that carbon nanotube membranes-exhibit significant ion exclusion that can be as high as 98% under certain conditions. Our results strongly support a Donnan-type rejection mechanism, dominated by electrostatic interactions between fixed membrane charges and mobile ions, whereas steric and hydrodynamic effects appear to be less important.
Reprint Address:
Bakajin, O, Lawrence Livermore Natl Lab, Chem Mat Earth & Life Sci Directorate, Livermore, CA 94550 USA.
Research Institution addresses:
[Fornasiero, Francesco; Holt, Jason K.; Stadermann, Michael; Noy, Aleksandr; Bakajin, Olgica] Lawrence Livermore Natl Lab, Chem Mat Earth & Life Sci Directorate, Livermore, CA 94550 USA; [Park, Hyung Gyu] Lawrence Livermore Natl Lab, Engn Directorate, Livermore, CA 94550 USA; [Grigoropoulos, Costas P.] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA; [Noy, Aleksandr] Univ Calif, Sch Nat Sci, Merced, CA 95344 USA; [Bakajin, Olgica] Univ Calif Davis, Natl Sci Fdn, Ctr Biophoton Sci & Technol, Sacramento, CA 95817 USA
E-mail Address:
bakajin1@llnl.gov
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Cited Reference Count:
53
Times Cited:
0
Publisher:
NATL ACAD SCIENCES; 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA
Subject Category:
Multidisciplinary Sciences
ISSN:
0027-8424
DOI:
10.1073/pnas.0710437105
IDS Number:
373OP
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