Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
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AU Stadermann, M
Sherlock, SP
In, JB
Fornasiero, F
Park, HG
Artyukhin, AB
Wang, YM
De Yoreo, JJ
Grigoropoulos, CP
Bakajin, O
Chernov, AA
Noy, A
AF Stadermann, Michael
Sherlock, Sarah P.
In, Jung-Bin
Fornasiero, Francesco
Park, Hyung Gyu
Artyukhin, Alexander B.
Wang, Yinmin
De Yoreo, James J.
Grigoropoulos, Costas P.
Bakajin, Olgica
Chernov, Alexander A.
Noy, Aleksandr
TI Mechanism and Kinetics of Growth Termination in Controlled Chemical
Vapor Deposition Growth of Multiwall Carbon Nanotube Arrays
SO NANO LETTERS
LA English
DT Article
ID PARTICLES; CATALYSTS
AB We have investigated growth kinetics of multiwall carbon nanotube
(MWCNT) arrays produced by catalytic thermal decomposition of ethylene
gas in hydrogen, water, and argon mixture. The MWCNT growth rate
exhibits a nonmonotonic dependence on total pressure and reaches a
maximum at similar to 750 Torr of total pressure. Water concentrations
in excess of 3000 ppm lead to the decrease in the observed growth rate.
Optimal pressure and water concentration combination results in a
reliable growth of well-aligned MWCNT arrays at a maximum growth rate
of similar to 30 mu m/min. These MWCNT arrays can reach heights of up
to 1 mm with typical standard deviations for the array height of less
than 8% over a large number of process runs spread over the time of 8
months. Nanotube growth rate in this optimal growth region remains
essentially constant until growth reaches an abrupt and irreversible
termination. We present a quantitative model that shows how
accumulation of the amorphous carbon patches at the catalyst particle
surface and the carbon diffusion to the growing nanotube perimeter
causes this abrupt growth cessation. The influence of the partial
pressures of ethylene and hydrogen on the ethylene decomposition
driving force explains the nonlinear behavior of the growth rate as a
function of total process pressure.
C1 [Stadermann, Michael; Sherlock, Sarah P.; In, Jung-Bin; Fornasiero, Francesco; Park, Hyung Gyu; Artyukhin, Alexander B.; Wang, Yinmin; Bakajin, Olgica; Chernov, Alexander A.; Noy, Aleksandr] Lawrence Livermore Natl Lab, Phys & Life Sci Directorate, Livermore, CA 94550 USA.
[Park, Hyung Gyu] Lawrence Livermore Natl Lab, Engn Directorate, Livermore, CA 94550 USA.
[In, Jung-Bin; Park, Hyung Gyu; Grigoropoulos, Costas P.] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA.
[De Yoreo, James J.] Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA.
[Bakajin, Olgica] Univ Calif Davis, Ctr Biophoton Sci & Technol, Sacramento, CA 95616 USA.
[Noy, Aleksandr] Univ Calif Merced, Sch Nat Sci, Merced, CA 95344 USA.
RP Noy, A, Lawrence Livermore Natl Lab, Phys & Life Sci Directorate,
Livermore, CA 94550 USA.
EM noyl@llnl.gov
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NR 27
TC 0
PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
DI 10.1021/nl803277g
PD FEB
VL 9
IS 2
BP 738
EP 744
SC Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials
Science, Multidisciplinary
GA 406MD
UT ISI:000263298700040
ER
PT J
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*Order Full Text [ ]
AU Ball, CD
MacWilliam, ND
Percus, JK
Bowles, RK
AF Ball, C. D.
MacWilliam, N. D.
Percus, J. K.
Bowles, R. K.
TI Normal and anomalous diffusion in highly confined hard disk fluid
mixtures
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE diffusion; liquid mixtures; liquid theory; Monte Carlo methods;
particle size
ID BINARY ADSORBATE MIXTURES; SINGLE-FILE DIFFUSION; DUAL-MODE DIFFUSION;
DIMENSIONAL NANOPOROUS MATERIALS; CARBON NANOTUBES; ACCELERATED
DIFFUSION; JOSEPHSON-JUNCTIONS; CHAOTIC SYSTEMS; SELF-DIFFUSION;
SEPARATION
AB Monte Carlo simulation is used to study binary mixtures of
two-dimensional hard disks, confined to long, narrow, structureless
pores with hard walls, in a regime of pore sizes where the large
particles exhibit single file diffusion while the small particles
diffuse normally. The dynamics of the small particles can be understood
in the context of a hopping time, tau(21), that measures the time it
takes for a small particle to escape the single file cage formed by its
large particle neighbors, and can be linked to the long time diffusion
coefficient. We find that tau(21) follows a power law as a function of
the reduced pore radius for a wide range of particle size ratios with
an exponent, alpha, that is independent of the size ratio, but linearly
dependent on the Monte Carlo step size used in the dynamic scheme. The
mean squared displacement of the small particles as a function of time
exhibits two dynamic crossovers. The first, from normal to anomalous
diffusion, occurs at intermediate times then the system returns to
normal diffusion in the long time limit. We also find that the
diffusion coefficient is related to tau(21) through a power law with
exponent beta=-0.5, as predicted by theory. Finally, we show that
particle separation in a binary mixture will be optimal at the pore
radius that causes the large particles to undergo their transition from
normal to anomalous diffusion.
C1 [Ball, C. D.; MacWilliam, N. D.; Bowles, R. K.] Univ Saskatchewan, Dept Chem, Saskatoon, SK S7N 5C9, Canada.
[Percus, J. K.] NYU, Dept Phys, New York, NY 10003 USA.
[Percus, J. K.] NYU, Courant Inst Math Sci, New York, NY 10012 USA.
RP Ball, CD, Univ Saskatchewan, Dept Chem, Saskatoon, SK S7N 5C9, Canada.
EM richard.bowles@usask.ca
CR ADHANGALE P, 2002, MOL PHYS, V100, P2727, DOI 10.1080/00268970210133224
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NR 36
TC 0
PU AMER INST PHYSICS; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON
QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
DI 10.1063/1.3074296
PD FEB 7
VL 130
IS 5
AR 054504
SC Physics, Atomic, Molecular & Chemical
GA 404QC
UT ISI:000263167100033
ER
PT J
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*Order Full Text [ ]
AU Zimmermann, FM
Shan, JW
AF Zimmermann, Frank M.
Shan, Jerry W.
TI Rotational friction of single-wall carbon nanotubes in liquid suspension
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE carbon nanotubes; friction; hydrodynamics; polarimetry; suspensions
ID DISPERSION; TRANSPORT; FLUID; FLOW
AB The hydrodynamics of single-wall carbon nanotubes rotated in liquid
suspension by an external electric field was experimentally
investigated with laser polarimetry and compared with theoretical
predictions. The measured rates of change of the nematic order
parameter were largely consistent with theoretical predictions based on
classical, no-slip hydrodynamics. This implies that, despite the
nanotubes' diameter approaching the size of the solvent molecules and
the reduced resistance previously reported for internal flow through
carbon nanotubes, classical continuum hydrodynamics holds approximately
for external flow about individual single-wall carbon nanotubes in
liquids.
C1 [Shan, Jerry W.] Rutgers State Univ, Dept Mech & Aerosp Engn, Piscataway, NJ 08854 USA.
[Zimmermann, Frank M.] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA.
[Zimmermann, Frank M.] Rutgers State Univ, Surface Modificat Lab, Piscataway, NJ 08854 USA.
RP Shan, JW, Rutgers State Univ, Dept Mech & Aerosp Engn, Piscataway, NJ
08854 USA.
EM jshan@jove.rutgers.edu
CR *EPAPS, 2007, EAPPLAB93034847 EPAP
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NR 26
TC 0
PU AMER INST PHYSICS; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON
QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
DI 10.1063/1.3033365
PD FEB 2
VL 94
IS 5
AR 053107
SC Physics, Applied
GA 404QB
UT ISI:000263167000055
ER
EF
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