Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
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AU Yu, MA
Funke, HH
Falconer, JL
Noble, RD
AF Yu, Miao
Funke, Hans H.
Falconer, John L.
Noble, Richard D.
TI Gated Ion Transport through Dense Carbon Nanotube Membranes
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID WATER-ADSORPTION; CHANNEL; SELECTIVITY; CONDUCTION
AB 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 and 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.
C1 [Yu, Miao; Funke, Hans H.; Falconer, John L.; Noble, Richard D.] Univ Colorado, Dept Chem & Biol Engn, Boulder, CO 80309 USA.
RP Falconer, JL, Univ Colorado, Dept Chem & Biol Engn, Boulder, CO 80309
USA.
EM john.falconer@colorado.edu
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NR 22
TC 0
PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0002-7863
DI 10.1021/ja9091769
PD JUN 23
VL 132
IS 24
BP 8285
EP 8290
SC Chemistry, Multidisciplinary
GA 612NJ
UT ISI:000278905700026
ER
EF
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