Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
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AU Tawfick, S
Deng, XP
Hart, AJ
Lahann, J
AF Tawfick, Sameh
Deng, Xiaopei
Hart, A. John
Lahann, Joerg
TI Nanocomposite microstructures with tunable mechanical and chemical
properties
SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS
LA English
DT Article
ID ALIGNED CARBON NANOTUBES; VAPOR-DEPOSITION POLYMERIZATION;
POLY-P-XYLYLENES; AREAL DENSITY; COATINGS; FABRICATION; COMPOSITES;
ARRAYS; MORPHOLOGY; SURFACES
AB We report a two-step chemical vapor deposition (CVD) method for
fabrication of hierarchical polymer-coated carbon nanotube (CNT)
microstructures having tunable mechanical properties and accessible
chemical functionality. Diverse geometries of vertically aligned CNTs
were grown from lithographically patterned catalyst films, and the CNT
microstructures were chemically functionalized via
poly[4-trifluoroacetyl-p-xylylene-co-p-xylylene] made by chemical vapor
deposition polymerization. The polymer coating conformally coated the
individual CNTs and CNT bundles within the CNT "forest''. The chemical
structure of the polymer films was verified by X-ray photoelectron
spectroscopy (XPS) and Fourier transform infrared spectroscopy ( FTIR).
Simple control of the mechanical properties of the nanocomposite
structures can be achieved by adjusting the deposition times during CVD
polymerization. Increasing the polymer film thickness from 10 nm to 27
nm resulted in a change of the Young's modulus from 65 to 80 MPa. These
values are substantially higher than the 36 MPa measured for the
as-grown CNTs without polymer coating. The effect of the polymer
coating in reinforcing the connectivity among CNTs within the
structures has been understood using an analytical model. Finally,
chemical functionality of the CNT composite structures after CVD
polymerization was verified by a 4-fold fluorescence enhancement after
binding of a dye to the coated CNT microstructures. This technique can
be adapted to a wide variety of reactive coatings and facilitates
attachment of chemical groups and functional nanostructures on the
surfaces of the CNTs; therefore, this material could serve as a tunable
platform for coupling mechanical and chemical responses in materials
for environmental and biological sensing.
C1 [Tawfick, Sameh; Hart, A. John] Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA.
[Deng, Xiaopei; Lahann, Joerg] Univ Michigan, Dept Macromol Sci & Engn, Ann Arbor, MI 48109 USA.
[Lahann, Joerg] Univ Michigan, Dept Chem Engn Mat Sci & Engn, Ann Arbor, MI 48109 USA.
RP Hart, AJ, Univ Michigan, Dept Mech Engn, Ann Arbor, MI 48109 USA.
EM ajohnh@umich.edu
lahann@umich.edu
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NR 55
TC 0
PU ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD,
CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1463-9076
DI 10.1039/c000304m
VL 12
IS 17
BP 4446
EP 4451
SC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
GA 586HB
UT ISI:000276896000025
ER
PT J
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AU Das, P
Zhou, RH
AF Das, Payel
Zhou, Ruhong
TI Urea-Induced Drying of Carbon Nanotubes Suggests Existence of a Dry
Globule-like Transient State During Chemical Denaturation of Proteins
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID DISPERSION INTERACTIONS; HYDROPHOBIC COLLAPSE; WATER; GUANIDINIUM;
TRANSPORT; MECHANISM; CHANNEL; MODEL
AB Atomistic dynamics simulations of purely hydrophobic carbon nanotubes
in 8 M urea are performed to dissect the role of dispersion
interactions in the denaturing power of urea. The enhanced population
of urea and a paucity of water in proximity of nanotubes suggest that
the stronger dispersion interaction of urea than water with nanotube
triggers drying of its interior. The preferential intrusion of urea
over water within nanotube interiors irrespective of their diameters
directly implies a "dry globule"-like transient intermediate formation
in the initial stage of protein unfolding in urea.
C1 [Das, Payel; Zhou, Ruhong] IBM Corp, Thomas J Watson Res Ctr, Computat Biol Ctr, Yorktown Hts, NY 10598 USA.
RP Zhou, RH, IBM Corp, Thomas J Watson Res Ctr, Computat Biol Ctr, 1101
Kitchawan Rd, Yorktown Hts, NY 10598 USA.
EM ruhongz@us.ibm.com
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NR 27
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PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1520-6106
DI 10.1021/jp911444q
PD APR 29
VL 114
IS 16
BP 5427
EP 5430
SC Chemistry, Physical
GA 586FO
UT ISI:000276889100028
ER
PT J
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AU Goldsmith, J
Martens, CC
AF Goldsmith, Jacob
Martens, Craig C.
TI Molecular Dynamics Simulation of Salt Rejection in Model
Surface-Modified Nanopores
SO JOURNAL OF PHYSICAL CHEMISTRY LETTERS
LA English
DT Article
ID CARBON NANOTUBE MEMBRANES; WATER PERMEATION; BROWNIAN MOTORS;
TRANSPORT; CHANNEL; FUNCTIONALIZATION; NANOFILTRATION; AQUAPORIN-1;
ENERGETICS; MECHANISM
AB This Letter describes molecular dynamics simulations of pressure
induced flow of water and aqueous salt solutions through model
nanopores. The systems studied are comprised of (n,n) carbon nanotubes
(CNT) that span a membrane constructed of parallel graphene walls
separating two solutions reserviors. We emply this system as an
idealized model of surface modified nanoporous membranes and thus, both
native hydrophobic CNT and nanotubes with artificial surface partial
charge patterns are considered. The dependence of the fluxes of water
and ions on the nanopore size, nanopore charge patterns, and pressure
difference are explored using nonequilibrium molecular dynamics
simulation. We demonstrate size-and structure-dependent salt rejection
and show evidence of salt flux rectification for our asymmetric
nanopore model.
C1 [Goldsmith, Jacob; Martens, Craig C.] Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA.
RP Martens, CC, Univ Calif Irvine, Dept Chem, Irvine, CA 92697 USA.
EM cmartens@uci.edu
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NR 43
TC 0
PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1948-7185
DI 10.1021/jz900173w
PD JAN 21
VL 1
IS 2
BP 528
EP 535
GA 588BC
UT ISI:000277040000015
ER
PT J
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AU Kazachkin, DV
Nishimura, Y
Irle, S
Feng, X
Vidic, R
Borguet, E
AF Kazachkin, Dmitry V.
Nishimura, Yoshifumi
Irle, Stephan
Feng, Xue
Vidic, Radisav
Borguet, Eric
TI Temperature and pressure dependence of molecular adsorption on single
wall carbon nanotubes and the existence of an "adsorption/desorption
pressure gap"
SO CARBON
LA English
DT Article
ID PORE STRUCTURE; SENSORS; ACETONE; VAPORS; DESORPTION; DEFECTS; GASES
AB The interaction of acetone with single wall carbon nanotubes (SWCNTs)
was studied by temperature programmed desorption with mass spectrometry
(TPD-MS), after reflux, sonication, or exposure to 7.6 Torr of acetone
vapors at room temperature. Acetone molecules adsorb strongly on SWCNTs
desorbing at similar to 400-900 K, corresponding to desorption energies
of similar to 100-225 kJ/mol, as intact molecules. Exchange of intact
adsorbed molecules with gas phase species was observed in successive
dosing of hydrogenated and deuterated acetone molecules. The desorption
energies reported here are in stark contrast to the desorption energies
(similar to 75 kJ/mol) reported earlier for SWCNTs interacting with
acetone under high vacuum at cryogenic temperatures. This result
suggests activated adsorption/desorption, and is also observed for
adsorption of ethanol, methane, n-butane and 1,3-butadiene on SWCNTs
and on carbon black. Quantum chemical calculations suggest that
adsorption in interstitial channels of bundles formed of large-diameter
SWCNTs is possible and can account for high desorption barriers, a
result of strong dispersion interactions between neighboring SWCNTs.
(C) 2009 Elsevier Ltd. All rights reserved.
C1 [Kazachkin, Dmitry V.; Feng, Xue; Borguet, Eric] Temple Univ, Dept Chem, Philadelphia, PA 19122 USA.
[Kazachkin, Dmitry V.] Univ Pittsburgh, Dept Chem Engn, Pittsburgh, PA 15261 USA.
[Nishimura, Yoshifumi; Irle, Stephan] Nagoya Univ, Dept Chem, Nagoya, Aichi 4648602, Japan.
[Nishimura, Yoshifumi; Irle, Stephan] Nagoya Univ, Inst Adv Res, Nagoya, Aichi 4648602, Japan.
[Feng, Xue; Vidic, Radisav] Univ Pittsburgh, Dept Civil & Environm Engn, Pittsburgh, PA 15261 USA.
RP Borguet, E, Temple Univ, Dept Chem, Philadelphia, PA 19122 USA.
EM eborguet@temple.edu
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NR 32
TC 0
PU PERGAMON-ELSEVIER SCIENCE LTD; THE BOULEVARD, LANGFORD LANE,
KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0008-6223
DI 10.1016/j.carbon.2009.11.018
PD JUN
VL 48
IS 7
BP 1867
EP 1875
SC Chemistry, Physical; Materials Science, Multidisciplinary
GA 586OT
UT ISI:000276920900001
ER
PT J
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AU Duan, WH
Wang, Q
AF Duan, Wen Hui
Wang, Quan
TI Water Transport with a Carbon Nanotube Pump
SO ACS NANO
LA English
DT Article
DE water transportation; carbon nanotubes; van der Waals energy; energy
pump; molecular dynamics simulations
ID FORCE-FIELD; MOLECULES
AB Transportation of water molecules in a carbon nanotube based on an
energy pump concept is investigated by molecular dynamics simulations.
A small portion of the initially twisted wall of a carbon nanotube is
employed to function as an energy pump for possible smooth
transportation of water molecules. The momentum and resultant force on
a water molecule and the corresponding displacement and velocity of the
molecule are particularly studied to disclose the transportation
process. The efficiency of the transportation is found to be dependent
on the size of the energy pump. Once the process for the transportation
of one molecule is elucidated, transportations of 20 water molecules
are simulated to investigate the effect of the environmental
temperature and fluctuations in the nanotube channel on the
transportation. It is revealed that the accelerated period of multiple
water molecules is longer than that in the transportation of a single
water molecule. In addition, the fluctuations in the nanotube wall due
to the buckling propagation and a higher environmental temperature will
all lead to obvious decreases in the water velocity and hence retard
the transportation process.
C1 [Wang, Quan] Univ Manitoba, Dept Mech & Mfg Engn, Winnipeg, MB R3T 5V6, Canada.
[Duan, Wen Hui] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia.
RP Wang, Q, Univ Manitoba, Dept Mech & Mfg Engn, Winnipeg, MB R3T 5V6,
Canada.
EM q_wang@umanitoba.ca
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NR 28
TC 0
PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1936-0851
DI 10.1021/nn1001694
PD APR
VL 4
IS 4
BP 2338
EP 2344
SC Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials
Science, Multidisciplinary
GA 586ZX
UT ISI:000276956800069
ER
EF
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