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Friday, April 23, 2010

ISI Web of Knowledge Alert - Majumder M

ISI Web of Knowledge Citation Alert

Cited Article: Majumder M. Nanoscale hydrodynamics - Enhanced flow in carbon nanotubes
Alert Expires: 09 NOV 2010
Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Towards mimicking natural protein channels with aligned carbon nanotube membranes for active drug delivery

Authors:
Majumder, M; Stinchcomb, A; Hinds, BJ

Author Full Names:
Majumder, Mainak; Stinchcomb, Audra; Hinds, Bruce J.

Source:
LIFE SCIENCES 86 (15-16): 563-568 APR 10 2010

Language:
English

Document Type:
Review

Author Keywords:
Drug delivery; Biomimetic; Nanostructure; Gatekeeper; Membrane; Transdermal; Nanoporous

KeyWords Plus:
WATER; TRANSPORT; POLYSTYRENE; GROWTH; FLOW

Abstract:
Aims: Carbon nanotube (CNT) membranes offer an exciting opportunity to mimic natural protein channels due to 1) a mechanism of dramatically enhanced fluid flow 2) ability to place 'gatekeeper' chemistry at the entrance to pores 3) the ability for biochemical reactions to occur on gatekeeper molecules and 4) an ability to chemically functionalize each side of the membrane independently.
Main methods: Aligned CNT membranes were fabricated and CNT pore entrances modified with gatekeeper chemistry. Pressure driven fluid flow and diffusion experiments were performed to study the mechanisms of transport through CNTs.
Key findings: The transport mechanism through CNT membranes is primarily 1) ionic diffusion near bulk expectation 2) gas flow enhanced 1-2 orders of magnitude primarily due to specular reflection 3) fluid flow 4-5 orders of magnitude faster than conventional materials due to a nearly ideal slip-boundary interface. The transport can be modulated by 'gatekeeper' chemistry at the pore entrance using steric hindrance, electrostatic attraction/repulsion, or biochemical state. The conformation of charged tethered molecules can be modulated by applied bias setting the stage for programmable drug release devices.
Significance: The membrane structure is mechanically far more robust than lipid bilayer films, allowing for large-scale chemical separations, delivery or sensing based on the principles of protein channels. The performance of protein channels is several orders of magnitude faster than conventional membrane materials. The fundamental requirements of mimicking protein channels are present in the CNT membrane system. Crown Copyright (C) 2009 Published by Elsevier Inc. All rights reserved.

Reprint Address:
Hinds, BJ, Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40502 USA.

Research Institution addresses:
[Majumder, Mainak; Hinds, Bruce J.] Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40502 USA; [Stinchcomb, Audra] Univ Kentucky, Coll Pharm, Lexington, KY 40502 USA

E-mail Address:
bjhinds@engr.uky.edu

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Cited Reference Count:
33

Times Cited:
1

Publisher:
PERGAMON-ELSEVIER SCIENCE LTD; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND

Subject Category:
Medicine, Research & Experimental; Pharmacology & Pharmacy

ISSN:
0024-3205

DOI:
10.1016/j.lfs.2009.04.006

IDS Number:
581UY

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Title:
Carbon nanotubes: Solid-phase extraction

Authors:
Ravelo-Perez, LM; Herrera-Herrera, AV; Hernandez-Borges, J; Rodriguez-Delgado, MA

Author Full Names:
Ravelo-Perez, Lidia M.; Herrera-Herrera, Antonio V.; Hernandez-Borges, Javier; Angel Rodriguez-Delgado, Miguel

Source:
JOURNAL OF CHROMATOGRAPHY A 1217 (16): 2618-2641 APR 16 2010

Language:
English

Document Type:
Review

Author Keywords:
Carbon nanotubes; Solid-phase extraction; Applications; Review

KeyWords Plus:
PERFORMANCE LIQUID-CHROMATOGRAPHY; ENVIRONMENTAL WATER SAMPLES; ATOMIC-ABSORPTION-SPECTROMETRY; DESORPTION/IONIZATION MASS-SPECTROMETRY; POLYBROMINATED DIPHENYL ETHERS; ELECTRON-CAPTURE DETECTION; RARE-EARTH-ELEMENTS; HEAVY-METAL IONS; GAS-CHROMATOGRAPHY; SENSITIVE DETERMINATION

Abstract:
Since the first report in 1991, carbon nanotubes (CNTs) have shown great possibilities for a wide variety of processes and applications, which include their use as electrodes, sensors (gas, enzymatic, etc.), nanoprobes, electronic materials, field emitters, etc. The combination of structures, dimensions and topologies has provided physical and chemical attractive properties that are unparalleled by most known materials. Their applications have also reached the Analytical Chemistry field in which CNTs are being used as matrices in matrix assisted laser desorption ionization, stationary phases in either gas chromatography, high performance liquid chromatography or capillary electrochromatography, also as pseudostationary phases in capillary electrophoresis, etc. as well as new solid-phase extraction (SPE) materials. Concerning this last application the number of works has considerably increased in the last five years. This review article pretends to focus on the most important!
features and different applications of SPE using CNTs (including matrix solid-phase dispersion and solid-phase microextraction) covering articles published since their introduction up to now (September 2009). (C) 2009 Elsevier B.V. All rights reserved.

Reprint Address:
Hernandez-Borges, J, Univ La Laguna, Dept Quim Analit Nutr & Bromatol, Fac Quim, Ave Astrofis Francisco Sanchez S-N, E-38206 Tenerife, Spain.

Research Institution addresses:
[Ravelo-Perez, Lidia M.; Herrera-Herrera, Antonio V.; Hernandez-Borges, Javier; Angel Rodriguez-Delgado, Miguel] Univ La Laguna, Dept Quim Analit Nutr & Bromatol, Fac Quim, E-38206 Tenerife, Spain

E-mail Address:
jhborges@ull.es; mrguez@ull.es

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Cited Reference Count:
180

Times Cited:
0

Publisher:
ELSEVIER SCIENCE BV; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS

Subject Category:
Biochemical Research Methods; Chemistry, Analytical

ISSN:
0021-9673

DOI:
10.1016/j.chroma.2009.10.083

IDS Number:
582AJ

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ISI Web of Knowledge Alert - Sokhan VP

ISI Web of Knowledge Citation Alert

Cited Article: Sokhan VP. Fluid flow in nanopores: Accurate boundary conditions for carbon nanotubes
Alert Expires: 09 NOV 2010
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Towards mimicking natural protein channels with aligned carbon nanotube membranes for active drug delivery

Authors:
Majumder, M; Stinchcomb, A; Hinds, BJ

Author Full Names:
Majumder, Mainak; Stinchcomb, Audra; Hinds, Bruce J.

Source:
LIFE SCIENCES 86 (15-16): 563-568 APR 10 2010

Language:
English

Document Type:
Review

Author Keywords:
Drug delivery; Biomimetic; Nanostructure; Gatekeeper; Membrane; Transdermal; Nanoporous

KeyWords Plus:
WATER; TRANSPORT; POLYSTYRENE; GROWTH; FLOW

Reprint Address:
Hinds, BJ, Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40502 USA.

E-mail Address:
bjhinds@engr.uky.edu

Cited Reference Count:
33

Times Cited:
1

Publisher:
PERGAMON-ELSEVIER SCIENCE LTD; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND

Subject Category:
Medicine, Research & Experimental; Pharmacology & Pharmacy

ISSN:
0024-3205

DOI:
10.1016/j.lfs.2009.04.006

IDS Number:
581UY

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ISI Web of Knowledge Alert - Holt JK

ISI Web of Knowledge Citation Alert

Cited Article: Holt JK. Fast mass transport through sub-2-nanometer carbon nanotubes
Alert Expires: 09 NOV 2010
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VR 1.0

PT J
*Record 1 of 2.
L5 <http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=000276551500002>
*Order Full Text [ ]
AU Majumder, M
Stinchcomb, A
Hinds, BJ
AF Majumder, Mainak
Stinchcomb, Audra
Hinds, Bruce J.
TI Towards mimicking natural protein channels with aligned carbon nanotube
membranes for active drug delivery
SO LIFE SCIENCES
LA English
DT Review
DE Drug delivery; Biomimetic; Nanostructure; Gatekeeper; Membrane;
Transdermal; Nanoporous
ID WATER; TRANSPORT; POLYSTYRENE; GROWTH; FLOW
AB Aims: Carbon nanotube (CNT) membranes offer an exciting opportunity to
mimic natural protein channels due to 1) a mechanism of dramatically
enhanced fluid flow 2) ability to place 'gatekeeper' chemistry at the
entrance to pores 3) the ability for biochemical reactions to occur on
gatekeeper molecules and 4) an ability to chemically functionalize each
side of the membrane independently.
Main methods: Aligned CNT membranes were fabricated and CNT pore
entrances modified with gatekeeper chemistry. Pressure driven fluid
flow and diffusion experiments were performed to study the mechanisms
of transport through CNTs.
Key findings: The transport mechanism through CNT membranes is
primarily 1) ionic diffusion near bulk expectation 2) gas flow enhanced
1-2 orders of magnitude primarily due to specular reflection 3) fluid
flow 4-5 orders of magnitude faster than conventional materials due to
a nearly ideal slip-boundary interface. The transport can be modulated
by 'gatekeeper' chemistry at the pore entrance using steric hindrance,
electrostatic attraction/repulsion, or biochemical state. The
conformation of charged tethered molecules can be modulated by applied
bias setting the stage for programmable drug release devices.
Significance: The membrane structure is mechanically far more robust
than lipid bilayer films, allowing for large-scale chemical
separations, delivery or sensing based on the principles of protein
channels. The performance of protein channels is several orders of
magnitude faster than conventional membrane materials. The fundamental
requirements of mimicking protein channels are present in the CNT
membrane system. Crown Copyright (C) 2009 Published by Elsevier Inc.
All rights reserved.
C1 [Majumder, Mainak; Hinds, Bruce J.] Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40502 USA.
[Stinchcomb, Audra] Univ Kentucky, Coll Pharm, Lexington, KY 40502 USA.
RP Hinds, BJ, Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40502 USA.
EM bjhinds@engr.uky.edu
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NR 33
TC 1
PU PERGAMON-ELSEVIER SCIENCE LTD; THE BOULEVARD, LANGFORD LANE,
KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0024-3205
DI 10.1016/j.lfs.2009.04.006
PD APR 10
VL 86
IS 15-16
BP 563
EP 568
SC Medicine, Research & Experimental; Pharmacology & Pharmacy
GA 581UY
UT ISI:000276551500002
ER

PT J
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AU Zhang, YY
Gregoire, JM
van Dover, RB
Hart, AJ
AF Zhang, Yongyi
Gregoire, John M.
van Dover, R. B.
Hart, A. John
TI Ethanol-Promoted High-Yield Growth of Few-Walled Carbon Nanotubes
SO JOURNAL OF PHYSICAL CHEMISTRY C
LA English
DT Article
ID FORESTS; WATER; CATALYSTS; ARRAYS; SIZE
AB We report the use of a small concentration of ethanol in addition to
ethylene as the carbon source for growth of dense vertically aligned
"forests" of few-walled carbon nanotubes (CNTs) Through a detailed
comparison of CNTs vi own with and without ethanol added to the
C2H4/H-2 feedstock, we quantify several important effects of the
ethanol addition We show that ethanol selectively reduces the number of
CNT walls without changing the outer diameter, increases the catalyst
lifetime more than 3-fold, and increases the rate of carbon conversion
more than 5-fold Online dewpoint and mass spectrometry measurements of
the exhaust stream suggest that ethanol decomposes into active carbon
species that enhance growth, and into H2O, which counteracts the
accumulation of amorphous carbon and thus prolongs the catalyst
lifetime We performed a systematic study of the effect of the catalyst
film thickness, and identify a set of conditions that provides growth
of millimeter-tall double-walled CNT forests Importantly, our study
reveals that the chemistry or the CVD atmosphere alone. plays a
critical role in controlling the structure of CNTs, and that addition
of ethanol results in few-walled CNTs over a broad range of growth
conditions These findings ale an important step toward the ultimate
goal of control of CNT chirality during synthesis as well as toward
realization of important large-scale applications of aligned CNT films
having high monodispersity and structural quality.
C1 [Zhang, Yongyi; Hart, A. John] Univ Michigan, Dept Mech Engn, Mechanosynth Grp, Ann Arbor, MI 48109 USA.
[Gregoire, John M.; van Dover, R. B.] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA.
[Gregoire, John M.; van Dover, R. B.] Cornell Univ, Cornell Fuel Cell Inst, Ithaca, NY 14853 USA.
RP Hart, AJ, Univ Michigan, Dept Mech Engn, Mechanosynth Grp, 2350 Hayward
St, Ann Arbor, MI 48109 USA.
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PU AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1932-7447
DI 10.1021/jp100358j
PD APR 15
VL 114
IS 14
BP 6389
EP 6395
SC Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science,
Multidisciplinary
GA 579BP
UT ISI:000276341700026
ER

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Thursday, April 15, 2010

ISI Web of Knowledge Alert - Ghosh, S

ISI Web of Knowledge Citation Alert

Cited Article: Ghosh, S. Carbon nanotube flow sensors
Alert Expires: 09 NOV 2010
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Synthesis, Growth Mechanism, and Properties of Open-Hexagonal and Nanoporous-Wall Ceria Nanotubes Fabricated via Alkaline Hydrothermal Route

Authors:
Wu, XS; Kawi, S

Author Full Names:
Wu, Xusheng; Kawi, Sibudjing

Source:
CRYSTAL GROWTH & DESIGN 10 (4): 1833-1841 APR 2010

Language:
English

Document Type:
Article

KeyWords Plus:
MIXED-OXIDE NANOTUBES; BORON-NITRIDE NANOTUBES; CARBON NANOTUBES; CO OXIDATION; ROOM-TEMPERATURE; TITANIA NANOTUBES; NI/Y2O3 CATALYSTS; CO3O4 NANOTUBES; SUPPORTED GOLD; WS2 NANOTUBES

Abstract:
Ce(OH)(3) open-hexagonal nanotubes [Ce(OH)(3)-OH-NT] and Ce(OH)(3) nanoporous-wall nanotubes [Ce(OH)(3)-NW-NT] have been successfully synthesized, for the first time, by a hydrothermal alkaline route and characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller method, differential thermal analysis-thermogravimetric analysis, and temperature-programmed reduction, The growth mechanism of Ce(OH)(3)-OH-NT via a hydrothermal alkaline route has been found to occur by the dissolution and recrystallization of surrounding Ce(OH)(3) compounds followed by anisotropical growth of Ce(OH)(3)-OH-NT gradually along the c-axis of nanotubes. The growth of Ce(OH)(3)-OH-NT has been observed, for the first time, to occur over two different Ce(OH)(3) compound bases: multidirectional growth of Ce(OH)(3)-OH-NT over a Ce(OH)(3) spherical core base to obtain nanotube flowers and vertical growth of Ce(OH)(3)-OH-NT over a !
Ce(OH)(3) flat base to obtain a nanotube jungle. Ce(OH)(3)-NW-NT has been successfully fabricated by further treating Ce(OH)(3)-OH-NT under static alkaline treatment at room temperature. Calcination of Ce(OH)(3)-OH-NT and Ce(OH)(3)-NW-NT leads to the formation of CeO2 open-hexagonal nanotubes (CeO2-OH-NT) and CeO2 nanoporous-wall nanotubes (CeO2-NW-NT), respectively. CeO2-OH-NT and CeO2-NW-NT are found to have higher surface area, easier reducibility, and higher mobility of surface oxygen species than CeO2 nanoparticles (CeO2-NP).

Reprint Address:
Kawi, S, Natl Univ Singapore, Dept Chem & Biomol Engn, 4 Engn Dr 4, Singapore 119260, Singapore.

Research Institution addresses:
[Wu, Xusheng; Kawi, Sibudjing] Natl Univ Singapore, Dept Chem & Biomol Engn, Singapore 119260, Singapore

E-mail Address:
chekawis@nus.edu.sg

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Cited Reference Count:
98

Times Cited:
0

Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA

Subject Category:
Chemistry, Multidisciplinary; Crystallography; Materials Science, Multidisciplinary

ISSN:
1528-7483

DOI:
10.1021/cg901515r

IDS Number:
577OV

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ISI Web of Knowledge Alert - Hummer, G

ISI Web of Knowledge Citation Alert

Cited Article: Hummer, G. Water conduction through the hydrophobic channel of a carbon nanotube
Alert Expires: 09 NOV 2010
Number of Citing Articles: 4 new records this week (4 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Tunable Water Channels with Carbon Nanoscrolls

Authors:
Shi, XH; Cheng, Y; Pugno, NM; Gao, HJ

Author Full Names:
Shi, Xinghua; Cheng, Yuan; Pugno, Nicola M.; Gao, Huajian

Source:
SMALL 6 (6): 739-744 MAR 22 2010

Language:
English

Document Type:
Article

Author Keywords:
graphene; ion channels; molecular dynamics; nanostructures; water channels

KeyWords Plus:
PARTICLE MESH EWALD; MOLECULAR-DYNAMICS; HYDROGEN STORAGE; ELECTRIC-FIELDS; NANOTUBES; TRANSPORT; CONDUCTION; MEMBRANES; ROUTE

Abstract:
Molecular dynamics simulations and theoretical analyses are performed to show that the flow rate of water through the core of carbon nanoscrolls (CNSs) can be adjusted over a broad range through the effective surface energy, which in turn can be tuned by an applied DC or AC electric field. The results suggest that the CNSs hold great promise for applications such as tunable water and ion channels, nanofluidic devices, and nanofilters, as well as tunable gene- and drug-delivery systems.

Reprint Address:
Gao, HJ, Brown Univ, Div Engn, 610 Barus & Holley,182 Hope St, Providence, RI 02912 USA.

Research Institution addresses:
[Shi, Xinghua; Gao, Huajian] Brown Univ, Div Engn, Providence, RI 02912 USA; [Cheng, Yuan] Inst High Performance Comp, Singapore 138632, Singapore; [Pugno, Nicola M.] Politecn Torino, Dept Struct Engn, I-10129 Turin, Italy

E-mail Address:
Huajian_Gao@brown.edu

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Cited Reference Count:
37

Times Cited:
0

Publisher:
WILEY-V C H VERLAG GMBH; PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY

Subject Category:
Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter

ISSN:
1613-6810

DOI:
10.1002/smll.200902286

IDS Number:
578MD

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Title:
Guest-free monolayer clathrate and its coexistence with two-dimensional high-density ice

Authors:
Bai, J; Angell, CA; Zeng, XC

Author Full Names:
Bai, Jaeil; Angell, C. Austen; Zeng, Xiao Cheng

Source:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 107 (13): 5718-5722 MAR 30 2010

Language:
English

Document Type:
Article

Author Keywords:
2D high-density ice; 2D low-density ice; 2D monolayer ice clathrate; Ostwald rule of stages; tensile limit of 2D liquid

KeyWords Plus:
MOLECULAR-DYNAMICS SIMULATION; LIQUID WATER; GLASSY WATER; THERMODYNAMIC STABILITY; NEGATIVE PRESSURES; HYDRATE; TRANSITION; NUCLEATION; PHASE; GROWTH

Abstract:
Three-dimensional (3D) gas clathrates are ice-like but distinguished from bulk ices by containing polyhedral nano-cages to accommodate small gas molecules. Without space filling by gas molecules, standalone 3D clathrates have not been observed to form in the laboratory, and they appear to be unstable except at negative pressure. Thus far, experimental evidence for guest-free clathrates has only been found in germanium and silicon, although guest-free hydrate clathrates have been found, in recent simulations, able to grow from cold stretched water, if first nucleated. Herein, we report simulation evidence of spontaneous formation of monolayer clathrate ice, with or without gas molecules, within hydrophobic nano-slit at low temperatures. The guest-free monolayer clathrate ice is a low-density ice (LDI) whose geometric pattern is identical to Archimedean 4 . 8(2)-truncated square tiling, i.e. a mosaic of tetragons and octagons. At large positive pressure, a second phase of 2D m!
onolayer ice, i.e. the puckered square high-density ice (HDI) can form. The triple point of the LDI/liquid/HDI three-phase coexistence resembles that of the ice-I-h/water/ice-III three-phase coexistence. More interestingly, when the LDI is under a strong compression at 200 K, it transforms into the HDI via a liquid intermediate state, the first direct evidence of Ostwald's rule of stages at 2D. The tensile limit of the 2D LDI and water are close to that of bulk ice-I-h and laboratory water.

Reprint Address:
Zeng, XC, Univ Nebraska, Dept Chem, Lincoln, NE 68588 USA.

Research Institution addresses:
[Bai, Jaeil; Zeng, Xiao Cheng] Univ Nebraska, Dept Chem, Lincoln, NE 68588 USA; [Bai, Jaeil; Zeng, Xiao Cheng] Univ Nebraska, Nebraska Ctr Mat & Nanosci, Lincoln, NE 68588 USA; [Angell, C. Austen] Arizona State Univ, Dept Chem, Tempe, AZ 85287 USA

E-mail Address:
xczeng@phase2.unl.edu

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46

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.0906437107

IDS Number:
576QA

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Title:
Principles of conduction and hydrophobic gating in K+ channels

Authors:
Jensen, MO; Borhani, DW; Lindorff-Larsen, K; Maragakis, P; Jogini, V; Eastwood, MP; Dror, RO; Shaw, DE

Author Full Names:
Jensen, Morten O.; Borhani, David W.; Lindorff-Larsen, Kresten; Maragakis, Paul; Jogini, Vishwanath; Eastwood, Michael P.; Dror, Ron O.; Shaw, David E.

Source:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 107 (13): 5833-5838 MAR 30 2010

Language:
English

Document Type:
Article

Author Keywords:
ion channel; ion permeation; membrane; electrophysiology; dewetting

KeyWords Plus:
POTASSIUM CHANNEL; ION CONDUCTION; SELECTIVITY FILTER; CRYSTAL-STRUCTURE; ACTIVATION GATE; VOLUME CHANGES; VOLTAGE; WATER; ENERGETICS; DYNAMICS

Abstract:
We present the first atomic-resolution observations of permeation and gating in a K+ channel, based on molecular dynamics simulations of the Kv1.2 pore domain. Analysis of hundreds of simulated permeation events revealed a detailed conduction mechanism, resembling the Hodgkin-Keynes "knock-on" model, in which translocation of two selectivity filter-bound ions is driven by a third ion; formation of this knock-on intermediate is rate determining. In addition, at reverse or zero voltages, we observed pore closure by a novel "hydrophobic gating" mechanism: A dewetting transition of the hydrophobic pore cavity-fastest when K+ was not bound in selectivity filter sites nearest the cavity-caused the open, conducting pore to collapse into a closed, nonconducting conformation. Such pore closure corroborates the idea that voltage sensors can act to prevent pore collapse into the intrinsically more stable, closed conformation, and it further suggests that molecular-scale dewetting facil!
itates a specific biological function: K+ channel gating. Existing experimental data support our hypothesis that hydrophobic gating may be a fundamental principle underlying the gating of voltage-sensitive K+ channels. We suggest that hydrophobic gating explains, in part, why diverse ion channels conserve hydrophobic pore cavities, and we speculate that modulation of cavity hydration could enable structural determination of both open and closed channels.

Reprint Address:
Shaw, DE, DE Shaw Res, New York, NY 10036 USA.

Research Institution addresses:
[Jensen, Morten O.; Borhani, David W.; Lindorff-Larsen, Kresten; Maragakis, Paul; Jogini, Vishwanath; Eastwood, Michael P.; Dror, Ron O.; Shaw, David E.] DE Shaw Res, New York, NY 10036 USA; [Shaw, David E.] Columbia Univ, Ctr Computat Biol & Bioinformat, New York, NY 10032 USA

E-mail Address:
David.Shaw@DEShawResearch.com

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59

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.0911691107

IDS Number:
576QA

========================================================================

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Title:
Separation of gases from gas-water mixtures using carbon nanotubes

Authors:
Lee, J; Aluru, NR

Author Full Names:
Lee, Joonho; Aluru, N. R.

Source:
APPLIED PHYSICS LETTERS 96 (13): Art. No. 133108 MAR 29 2010

Language:
English

Document Type:
Article

Author Keywords:
adsorption; carbon nanotubes; diffusion; mixtures; molecular dynamics method

KeyWords Plus:
MOLECULAR-DYNAMICS METHOD; HYDROGEN; SIMULATIONS; SOLUBILITY; ADSORPTION; DIFFUSION; TRANSPORT; STORAGE; FLOW

Abstract:
We investigate equilibrium transport of gas-water mixtures, such as CO2-water, O-2-water and H-2-water mixtures, in carbon nanotubes using molecular dynamics simulations. Our results indicate that gases are selectively physisorbed in carbon nanotubes forming single-file gas chains. Once the single-file gas chains are formed, they prevent entry of water into the nanotube, suggesting that the presence of gas molecules can significantly affect the equilibrium transport of water in carbon nanotubes. The diffusion of single-file gas chains in nanotubes for gas-water mixtures is found to be lower compared to the single-file diffusion of gases in gas-only cases.

Reprint Address:
Aluru, NR, Univ Illinois Urbana Champaign, Dept Mech Sci & Engn, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA.

Research Institution addresses:
[Lee, Joonho; Aluru, N. R.] Univ Illinois Urbana Champaign, Dept Mech Sci & Engn, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA

E-mail Address:
aluru@illinois.edu

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BERENDSEN HJC, 1987, J PHYS CHEM-US, V91, P6269.
CHEN GH, 1993, PHYS REV B, V48, P13959.
DILLON AC, 1997, NATURE, V386, P377.
HAHN K, 1998, J PHYS CHEM B, V102, P5766.
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HOLT JK, 2006, SCIENCE, V312, P1034, DOI 10.1126/science.1126298.
HUMMER G, 2001, NATURE, V414, P188.
JOSEPH S, 2008, NANO LETT, V8, P452, DOI 10.1021/nl072385q.
KALRA A, 2004, J PHYS CHEM B, V108, P544, DOI 10.1021/jp035828x.
KJELLANDER R, 1998, J ELECTROANAL CHEM, V450, P233.
KOTSALIS EM, 2004, INT J MULTIPHAS FLOW, V30, P995, DOI 10.1016/j.imultiphaseflow.2004.03.009.
LINDAHL E, 2001, J MOL MODEL, V7, P306.
LIU C, 1999, SCIENCE, V286, P1127.
LUZAR A, 2005, J PHYS CHEM B, V109, P22545, DOI 10.1021/jp054545x.
MAJUMDER M, 2005, NATURE, V438, P44, DOI 10.1038/43844a.
MARSH H, 1982, CARBON, V20, P419.
MON KK, 2002, J CHEM PHYS, V117, P2289.
NOSE S, 1984, MOL PHYS, V52, P255.
PARRINELLO M, 1981, J APPL PHYS, V52, P7182.
PATEY GN, 1975, J CHEM PHYS, V63, P2334.
SHAH JK, 2005, J PHYS CHEM B, V109, P10395, DOI 10.1021/jp0442089.
SKOULIDAS AI, 2002, PHYS REV LETT, V89, ARTN 185901.
ZUTTEL A, 2004, APPL PHYS A-MATER, V78, P941, DOI 10.1007/s00339-003-2412-1.

Cited Reference Count:
24

Times Cited:
0

Publisher:
AMER INST PHYSICS; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA

Subject Category:
Physics, Applied

ISSN:
0003-6951

DOI:
10.1063/1.3374363

IDS Number:
578EC

Please enter your account number here:

ISI Web of Knowledge Alert - Holt JK

ISI Web of Knowledge Citation Alert

FN ISI Export Format
VR 1.0

PT J
*Record 1 of 2.
L5 <http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=000276282900006>
*Order Full Text [ ]
AU Dumee, LF
Sears, K
Schutz, J
Finn, N
Huynh, C
Hawkins, S
Duke, M
Gray, S
AF Dumee, Ludovic F.
Sears, Kallista
Schuetz, Juerg
Finn, Niall
Huynh, Chi
Hawkins, Stephen
Duke, Mikel
Gray, Stephen
TI Characterization and evaluation of carbon nanotube Bucky-Paper
membranes for direct contact membrane distillation
SO JOURNAL OF MEMBRANE SCIENCE
LA English
DT Article
DE Carbon nanotube; Bucky-paper; Membrane; Direct contact membrane
distillation; Desalination
ID GAS-PERMEABILITY; MASS-TRANSPORT; FLUX
AB Self-supporting carbon nanotube (CNT) Bucky-Papers have unique
structural and surface properties which can be utilised in many
applications. In this work we characterised pure self-supporting CNT
membranes, where CNTs were held together only by Van der Waals forces,
and evaluated their potential and performance in direct contact
membrane distillation. The membranes were found to be highly
hydrophobic (contact angle of 113 degrees), highly porous (90%), and to
exhibit a thermal conductivity of 2.7 kW/m(2) h. We demonstrate, as a
proof of concept, that self-supporting CNT Bucky-Paper membranes can be
used for desalination in a direct contact membrane distillation setup
with 99% salt rejection and a flux rate of similar to 12 kg/m(2) h at a
water vapour partial pressure difference of 22.7 kPa. Ageing of the
membranes by delamination is a main factor limiting their performance
and work is currently under way to address this issue by investigating
composite material structures. (C) 2010 Elsevier B.V. All rights
reserved.
C1 [Dumee, Ludovic F.; Sears, Kallista; Schuetz, Juerg; Finn, Niall; Huynh, Chi; Hawkins, Stephen] CSIRO Mat Sci & Engn, Clayton, Vic 3168, Australia.
[Dumee, Ludovic F.; Duke, Mikel; Gray, Stephen] Victoria Univ, Melbourne, Vic 8001, Australia.
RP Dumee, LF, CSIRO Mat Sci & Engn, Bayview Ave, Clayton, Vic 3168,
Australia.
EM ludovic.dumee@csiro.au
kallista.sears@csiro.au
CR BASMADJIAN D, 2004, MASS TRANSFER PRINCI
BESSIERES A, 1996, J MEMBRANE SCI, V109, P13
BIRD RB, 2006, TRANSPORT PHENOMENA
BURGOYNE A, 2000, SEPAR SCI TECHNOL, V35, P1257
CABASSUD C, 2003, C DES ENV FRESH WAT
CHANDLER D, 2005, NATURE, V437, P640, DOI 10.1038/nature04162
COOPER SM, 2003, NANO LETT, V3, P189, DOI 10.1021/nl0259131
CORRY B, 2008, J PHYS CHEM B, V112, P1427, DOI 10.1021/jp709845u
DAS RN, 2009, NANO LETT, V9, P677, DOI 10.1021/nl803168s
DUMEE L, 2008, ICOM08
ELBOURAWI MS, 2006, J MEMBRANE SCI, V285, P4, DOI
10.1016/j.memsci.2006.08.002
FORNASIERO F, 2008, P NATL ACAD SCI USA, V105, P17250, DOI
10.1073/pnas.0710437105
GOU J, 2004, INT J NANOSCIENCE, V3, P14
GRYTA M, 2006, DESALINATION, V198, P67, DOI 10.1016/j.desal.2006.09.010
HERNANDEZ A, 1996, J MEMBRANE SCI, V112, P1
HINDS BJ, 2004, SCIENCE, V303, P62, DOI 10.1126/science.1092048
HOLT JK, 2006, SCIENCE, V312, P1034, DOI 10.1126/science.1126298
HUYNH C, CARBON UNPUB
KHAYET M, 2001, IND ENG CHEM RES, V40, P5710
LAGANA F, 2000, J MEMBRANE SCI, V166, P1
LAWSON KW, 1995, J MEMBRANE SCI, V101, P99
LAWSON KW, 1996, J MEMBRANE SCI, V120, P123
LAWSON KW, 1997, J MEMBRANE SCI, V124, P1
MURAMATSU H, 2005, CHEM PHYS LETT, V414, P444, DOI
10.1016/j.cplett.2005.08.110
NURIEL S, 2005, CHEM PHYS LETT, V404, P263, DOI
10.1016/j.cplett.2005.01.072
PARSEGIAN VA, 2005, HDB BIOL CHEM ENG PH
PHATTARANAWIK J, 2003, J MEMBRANE SCI, V215, P75, DOI
10.1016/S0376-7388(02)00603-8
SCHOFIELD RW, 1990, DESALINATION, V77, P279
SMOLDERS K, 1989, DESALINATION, V72, P249
NR 29
TC 0
PU ELSEVIER SCIENCE BV; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0376-7388
DI 10.1016/j.memsci.2010.01.025
PD APR 1
VL 351
IS 1-2
BP 36
EP 43
SC Engineering, Chemical; Polymer Science
GA 578GZ
UT ISI:000276282900006
ER

PT J
*Record 2 of 2.
L5 <http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS&DestLinkType=FullRecord;UT=000276275300054>
*Order Full Text [ ]
AU Lee, J
Aluru, NR
AF Lee, Joonho
Aluru, N. R.
TI Separation of gases from gas-water mixtures using carbon nanotubes
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE adsorption; carbon nanotubes; diffusion; mixtures; molecular dynamics
method
ID MOLECULAR-DYNAMICS METHOD; HYDROGEN; SIMULATIONS; SOLUBILITY;
ADSORPTION; DIFFUSION; TRANSPORT; STORAGE; FLOW
AB We investigate equilibrium transport of gas-water mixtures, such as
CO2-water, O-2-water and H-2-water mixtures, in carbon nanotubes using
molecular dynamics simulations. Our results indicate that gases are
selectively physisorbed in carbon nanotubes forming single-file gas
chains. Once the single-file gas chains are formed, they prevent entry
of water into the nanotube, suggesting that the presence of gas
molecules can significantly affect the equilibrium transport of water
in carbon nanotubes. The diffusion of single-file gas chains in
nanotubes for gas-water mixtures is found to be lower compared to the
single-file diffusion of gases in gas-only cases.
C1 [Lee, Joonho; Aluru, N. R.] Univ Illinois Urbana Champaign, Dept Mech Sci & Engn, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA.
RP Aluru, NR, Univ Illinois Urbana Champaign, Dept Mech Sci & Engn,
Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA.
EM aluru@illinois.edu
CR ALAVI JS, 2005, J CHEM PHYS, V123, UNSP 024507
BERENDSEN HJC, 1987, J PHYS CHEM-US, V91, P6269
CHEN GH, 1993, PHYS REV B, V48, P13959
DILLON AC, 1997, NATURE, V386, P377
HAHN K, 1998, J PHYS CHEM B, V102, P5766
HAN SS, 2005, APPL PHYS LETT, V86, ARTN 203108
HOLT JK, 2006, SCIENCE, V312, P1034, DOI 10.1126/science.1126298
HUMMER G, 2001, NATURE, V414, P188
JOSEPH S, 2008, NANO LETT, V8, P452, DOI 10.1021/nl072385q
KALRA A, 2004, J PHYS CHEM B, V108, P544, DOI 10.1021/jp035828x
KJELLANDER R, 1998, J ELECTROANAL CHEM, V450, P233
KOTSALIS EM, 2004, INT J MULTIPHAS FLOW, V30, P995, DOI
10.1016/j.imultiphaseflow.2004.03.009
LINDAHL E, 2001, J MOL MODEL, V7, P306
LIU C, 1999, SCIENCE, V286, P1127
LUZAR A, 2005, J PHYS CHEM B, V109, P22545, DOI 10.1021/jp054545x
MAJUMDER M, 2005, NATURE, V438, P44, DOI 10.1038/43844a
MARSH H, 1982, CARBON, V20, P419
MON KK, 2002, J CHEM PHYS, V117, P2289
NOSE S, 1984, MOL PHYS, V52, P255
PARRINELLO M, 1981, J APPL PHYS, V52, P7182
PATEY GN, 1975, J CHEM PHYS, V63, P2334
SHAH JK, 2005, J PHYS CHEM B, V109, P10395, DOI 10.1021/jp0442089
SKOULIDAS AI, 2002, PHYS REV LETT, V89, ARTN 185901
ZUTTEL A, 2004, APPL PHYS A-MATER, V78, P941, DOI
10.1007/s00339-003-2412-1
NR 24
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 10.1063/1.3374363
PD MAR 29
VL 96
IS 13
AR 133108
SC Physics, Applied
GA 578EC
UT ISI:000276275300054
ER

Please enter your account number here:

ISI Web of Knowledge Alert - Majumder M

ISI Web of Knowledge Citation Alert

Cited Article: Majumder M. Nanoscale hydrodynamics - Enhanced flow in carbon nanotubes
Alert Expires: 09 NOV 2010
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Separation of gases from gas-water mixtures using carbon nanotubes

Authors:
Lee, J; Aluru, NR

Author Full Names:
Lee, Joonho; Aluru, N. R.

Source:
APPLIED PHYSICS LETTERS 96 (13): Art. No. 133108 MAR 29 2010

Language:
English

Document Type:
Article

Author Keywords:
adsorption; carbon nanotubes; diffusion; mixtures; molecular dynamics method

KeyWords Plus:
MOLECULAR-DYNAMICS METHOD; HYDROGEN; SIMULATIONS; SOLUBILITY; ADSORPTION; DIFFUSION; TRANSPORT; STORAGE; FLOW

Reprint Address:
Aluru, NR, Univ Illinois Urbana Champaign, Dept Mech Sci & Engn, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA.

Research Institution addresses:
[Lee, Joonho; Aluru, N. R.] Univ Illinois Urbana Champaign, Dept Mech Sci & Engn, Beckman Inst Adv Sci & Technol, Urbana, IL 61801 USA

E-mail Address:
aluru@illinois.edu

Cited Reference Count:
24

Times Cited:
0

Publisher:
AMER INST PHYSICS; CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA

Subject Category:
Physics, Applied

ISSN:
0003-6951

DOI:
10.1063/1.3374363

IDS Number:
578EC

Please enter your account number here:

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