Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
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AU Song, C
Corry, B
AF Song, Chen
Corry, Ben
TI Intrinsic Ion Selectivity of Narrow Hydrophobic Pores
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID CARBON NANOTUBE MEMBRANES; FREE-ENERGY CALCULATIONS;
MOLECULAR-DYNAMICS; MEAN FORCE; ACETYLCHOLINE-RECEPTOR; POTASSIUM
CHANNEL; PEPTIDE NANOTUBE; WATER TRANSPORT; MASS-TRANSPORT; K+ ION
AB We show that narrow hydrophobic pores have an intrinsic ion selectivity
by using single-walled carbon nanotube membranes as a model. We
examined pores of radius 3.4-6.1 angstrom, and conducted molecular
dynamics simulations to show that Na+, K+, and Cl- face different free
energy barriers when entering hydrophobic pores. Most of the
differences result from the different dehydration energies of the ions;
however, changes in the solvation shell structure in the confined
nanotube interior and van der Waals interactions in the small tubes can
both play a role. Molecular dynamics simulations conducted under
hydrostatic pressure show that carbon nanotube membranes can act as ion
sieves, with the pore radius and pressure determining which ions will
permeate through the membrane. This work suggests that the intrinsic
ion selectivity of biological pores of differing radii might also play
a role in determining their selectivity, in addition to the more common
explanations based on electrostatic effects. In addition, "hydrophobic
gating" can arise in continuous water-filled pores.
C1 [Song, Chen; Corry, Ben] Univ Western Australia, Sch Biomed Biomol & Chem Sci, Crawley, WA 6009, Australia.
RP Corry, B, Univ Western Australia, Sch Biomed Biomol & Chem Sci,
Crawley, WA 6009, Australia.
EM ben.corry@uwa.edu.au
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NR 52
TC 0
PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1520-6106
DI 10.1021/jp810102u
PD MAY 28
VL 113
IS 21
BP 7642
EP 7649
SC Chemistry, Physical
GA 448YA
UT ISI:000266296700032
ER
PT J
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AU Sae-Khow, O
Mitra, S
AF Sae-Khow, Ornthida
Mitra, Somenath
TI Fabrication and characterization of carbon nanotubes immobilized in
porous polymeric membranes
SO JOURNAL OF MATERIALS CHEMISTRY
LA English
DT Article
ID MIXED MATRIX MEMBRANES; HOLLOW-FIBER MEMBRANES; GAS SEPARATION;
BENZENE/CYCLOHEXANE MIXTURES; PERVAPORATION SEPARATION; POLY(VINYL
ALCOHOL); HYBRID MEMBRANES; BARRIER FILM; EXTRACTION; CHROMATOGRAPHY
AB We demonstrate that the incorporation of carbon nanotubes (CNTs) in the
pores of a membrane can offer several advantages. A dispersion of CNTs
in polyvinylidene fluoride was injected through a porous membrane,
which immobilized the nanotubes in the pore structure. The CNTs served
as a sorbent facilitating solute exchange between the two phases
leading to enhancement of the enrichment factor by as much as 93%. The
presence of CNTs also developed a diffusion barrier by sorbing solvent
on its surface, which led to higher retention of the extractant within
the membrane.
C1 [Sae-Khow, Ornthida; Mitra, Somenath] New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ 07102 USA.
RP Mitra, S, New Jersey Inst Technol, Dept Chem & Environm Sci, Newark, NJ
07102 USA.
EM Mitra@njit.edu
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NR 30
TC 0
PU ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD,
CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 0959-9428
DI 10.1039/b822879e
VL 19
IS 22
BP 3713
EP 3718
SC Chemistry, Physical; Materials Science, Multidisciplinary
GA 450OO
UT ISI:000266410900023
ER
EF
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