ISI Web of Knowledge Alert - Ghosh, S

ISI Web of Knowledge Citation Alert

Cited Article: Ghosh, S. Carbon nanotube flow sensors
Alert Expires: 22 OCT 2009
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
THE STATE OF THE ART IN BIOMATERIALS AS NANOBIOPHARMACEUTICALS

Authors:
Veerapandian, M; Yun, K

Author Full Names:
Veerapandian, Murugan; Yun, Kyusik

Source:
DIGEST JOURNAL OF NANOMATERIALS AND BIOSTRUCTURES 4 (2): 243-262 JUN 2009

Language:
English

Document Type:
Review

Author Keywords:
Biomaterials; Nanotechnology; Nanomedicine; Nanobiopharmaceutical

KeyWords Plus:
SOLID LIPID NANOPARTICLES; PROTEIN CAGE ARCHITECTURE; CONTROLLED DRUG-DELIVERY; GROWN CARBON NANOFIBERS; QUANTUM DOTS; CONTRAST AGENTS; IN-VIVO; CHITOSAN NANOPARTICLES; SILICA NANOPARTICLES; CLINICAL-APPLICATIONS

Abstract:
The development of wide spectrum of drug delivery systems is fundamental importance to change the establishment of disease diagnosis, treatment and prevention. The fusion technologies of material science and nanomedicine have emerged as a new alternative and efficient field for transporting and translocating the therapeutic molecules. Biologically active materials can be functionalized with peptides, proteins, nucleic acids and drugs, and also be used as the delivery system to cell and organs. Today nanoscience and pharmaceutical technology approaches to drug design and formulation to enhance the biological behavior and safety profile. Unique higher surface area, surface roughness, altered electron distribution, energetics and biological activity of standardized materials made a feasible role in therapeutics. Rationalized material, drug design and formulation will ensure the good clinical significance of the pharmaceutical product. This article will highlight the distinguish!
ed nanoscale biomaterials categorized by metal, non-metal, carbon, polymer, lipid, virus and miscellaneous nanostructures as nanobiopharmaceutical carrier systems and their medical/biological applications and toxicological issues in the field of biomedical nanotechnology.

Reprint Address:
Yun, K, Kyungwon Univ, Coll Bionanotechnol, San65, Songnam 461701, Gyeonggi Do, South Korea.

Research Institution addresses:
[Veerapandian, Murugan; Yun, Kyusik] Kyungwon Univ, Coll Bionanotechnol, Songnam 461701, Gyeonggi Do, South Korea

E-mail Address:
ykyusik@kyungwon.ac.kr

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Cited Reference Count:
145

Times Cited:
0

Publisher:
INST MATERIALS PHYSICS; NATL INST R&D MATERIALS PHYSICS, ATOMISTILOR STR, 105 BIS, BUCHAREST, 077125, ROMANIA

Subject Category:
Nanoscience & Nanotechnology; Materials Science, Multidisciplinary

ISSN:
1842-3582

IDS Number:
468OV

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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: 22 OCT 2009
Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Molecular dynamics investigation of hydration of nanoscopic hydrophobic paraffin-like plates

Authors:
Choudhury, N

Author Full Names:
Choudhury, Niharendu

Source:
JOURNAL OF CHEMICAL PHYSICS 131 (1): Art. No. 014507 JUL 7 2009

Language:
English

Document Type:
Article

Author Keywords:
hydrogen bonds; hydrophobicity; molecular dynamics method; molecular moments; molecular orientation; plates (structures); solvation; water; wetting

KeyWords Plus:
DEWETTING TRANSITION; HYDROPHILIC SURFACES; CARBON NANOTUBES; LIQUID WATER; SOLUTE SIZE; SIMULATION; COLLAPSE; C-60; INTERFACES; NANOSCALE

Abstract:
The effect of surface characteristics on the hydration behavior of various paraffin-like plates has been investigated. Structure and orientation characteristics of the water molecules in the solvation shells of various nanoscopic paraffin-like plates differing from each other in the intermolecular spacing have been extensively studied using molecular dynamics simulation in isothermal-isobaric ensemble. Single particle density distribution of water molecules around the plate reveals well defined solvation shells around each of the paraffin-like plates studied here. A sharp first peak in the density profile in each of the plates signifies no visible dewetting around the paraffin plate. Instantaneous density of water molecules around the plate also reveals that the plate is sufficiently hydrated and there is no intermittent fluctuation in water density in the first hydration shell leading to short lived dewetted state for any of the model plates within the two nanosecond time s!
pan. This is in contrast to the hydration behavior of the intersolute region, where intersolute dewetting has been observed for some of the model plates. Thus the present results demonstrate that dewetting in the intersolute region of nanoscopic hydrophobic plates does not stem from drying interface of the individual solute. No significant effect of surface topology on the orientational structure of water molecules as revealed through distributions of dipole moment as well as oxygen-hydrogen bond vectors of a water molecule in different solvation shells has been observed.

Reprint Address:
Choudhury, N, Bhabha Atom Res Ctr, Theoret Chem Sect, Chem Grp, Bombay 400085, Maharashtra, India.

Research Institution addresses:
Bhabha Atom Res Ctr, Theoret Chem Sect, Chem Grp, Bombay 400085, Maharashtra, India

E-mail Address:
nihcho@barc.gov.in

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Cited Reference Count:
51

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, Atomic, Molecular & Chemical

ISSN:
0021-9606

DOI:
10.1063/1.3155186

IDS Number:
468EY

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Title:
Proton Transport Pathway in the CIC Cl-/H+ Antiporter

Authors:
Wang, D; Voth, GA

Author Full Names:
Wang, Dong; Voth, Gregory A.

Source:
BIOPHYSICAL JOURNAL 97 (1): 121-131 JUL 8 2009

Language:
English

Document Type:
Article

KeyWords Plus:
VALENCE-BOND MODEL; CHLORIDE CHANNELS; COMPUTER-SIMULATION; EXCHANGE TRANSPORTER; BIOMOLECULAR SYSTEMS; PROKARYOTIC HOMOLOG; ESCHERICHIA-COLI; SIDE-CHAIN; WATER; PROTEINS

Abstract:
A fundamental question concerning the CIC Cl-/H+ antiporters is the nature of their proton transport (PT) pathway, We addressed this issue by using a novel computational methodology capable of describing the explicit PT dynamics in the CIC-ec1 protein. The main result is that the Glu(203) residue delivers a proton from the intracellular solution to the core of CIC-ec1 via a rotation of its side chain and subsequent acid dissociation. After reorientation of the Glu(203) side chain, a transient water-mediated PT pathway between Glu(203) and Glu(148) is established that is able to receive and translocate the proton via Grotthuss shuttling after deprotonation of Glu(203). A molecular-dynamics simulation of an explicit hydrated excess proton in this pathway suggests that a negatively charged Glu(148) and the central Cl- ion act together to drive H+ to the extracellular side of the membrane. This finding is consistent with the experimental result that Cl- binding to the central si!
te facilitates the proton movement. A calculation of the PT free-energy barrier for the CIC-ec1 E203V mutant also supports the proposal that a dissociable residue is required at this position for efficient delivery of H+ to the protein interior, in agreement with recent experimental results.

Reprint Address:
Voth, GA, Univ Utah, Ctr Biophys Modeling & Simulat, Salt Lake City, UT 84112 USA.

Research Institution addresses:
[Voth, Gregory A.] Univ Utah, Ctr Biophys Modeling & Simulat, Salt Lake City, UT 84112 USA; Univ Utah, Dept Chem, Salt Lake City, UT 84112 USA

E-mail Address:
voth@chem.utah.edu

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Cited Reference Count:
52

Times Cited:
0

Publisher:
CELL PRESS; 600 TECHNOLOGY SQUARE, 5TH FLOOR, CAMBRIDGE, MA 02139 USA

Subject Category:
Biophysics

ISSN:
0006-3495

DOI:
10.1016/j.bpj.2009.04.038

IDS Number:
469BV

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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: 18 OCT 2009
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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*Order Full Text [ ]
AU Unnikrishnan, S
Jansen, HV
Falke, FH
Tas, NR
Van Wolferen, HAGM
De Boer, MJ
Sanders, RGP
Elwenspoek, MC
AF Unnikrishnan, S.
Jansen, H. V.
Falke, F. H.
Tas, N. R.
Van Wolferen, H. A. G. M.
De Boer, M. J.
Sanders, R. G. P.
Elwenspoek, M. C.
TI Transition flow through an ultra-thin nanosieve
SO NANOTECHNOLOGY
LA English
DT Article
ID MEMBRANES; GASES; SEPARATION; TUBES; PORE
AB The fabrication and gas flow characterization of an ultra-thin
inorganic nanosieve structured by interference lithography and a
bond-micromachining approach are reported. The nanosieve has been
observed to exhibit transition gas flow behaviour around atmospheric
pressure and ambient temperature. The small lip thickness (45 nm) of
the nanopores with respect to their diameter (120 nm) helps in
understanding pure transition flow by minimizing interactions between
the molecule and inner pore wall. Due to the absence of these
collisions, the transition flux is the superimposition of viscous and
molecular fluxes without the need for higher-order slip correction. The
nanosieve shows a flow selectivity of 3.1 between helium and argon at
20 mbar.
C1 [Unnikrishnan, S.; Jansen, H. V.; Falke, F. H.; Tas, N. R.; Van Wolferen, H. A. G. M.; De Boer, M. J.; Sanders, R. G. P.; Elwenspoek, M. C.] Univ Twente, MESA Inst Nanotechnol, Transducers Sci & Technol Grp, NL-7500 AE Enschede, Netherlands.
[Elwenspoek, M. C.] Univ Freiburg, FRIAS, D-79194 Freiburg, Germany.
RP Unnikrishnan, S, Univ Twente, MESA Inst Nanotechnol, Transducers Sci &
Technol Grp, POB 217, NL-7500 AE Enschede, Netherlands.
EM s.unnikrishnan@ewi.utwente.nl
CR ARKILIC EB, 2001, J FLUID MECH, V437, P29
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JANSEN HV, 2009, J MICROMECH MICROENG, V19, ARTN 033001
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NR 24
TC 0
PU IOP PUBLISHING LTD; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
SN 0957-4484
DI 10.1088/0957-4484/20/30/305304
PD JUL 29
VL 20
IS 30
AR 305304
SC Engineering, Multidisciplinary; Nanoscience & Nanotechnology; Materials
Science, Multidisciplinary; Physics, Applied
GA 468LW
UT ISI:000267821000009
ER

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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: 18 OCT 2009
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Effects of H-2 plasma pretreated Ni catalysts on the growth of carbon nanotubes

Authors:
Jian, SR

Author Full Names:
Jian, Sheng-Rui

Source:
MATERIALS CHEMISTRY AND PHYSICS 115 (2-3): 740-743 JUN 15 2009

Language:
English

Document Type:
Article

Author Keywords:
Multi-walled carbon nanotubes; H-2 pretreatment; Raman spectroscopy; Scanning electron microscopy; Transmission electron microscopy

KeyWords Plus:
CHEMICAL-VAPOR-DEPOSITION; RAPID GROWTH; ARRAYS; DENSITY; SENSORS; FLOW

Abstract:
Presented in this study are the effects of pretreatment temperature during H-2 plasma on synthesizing the multi-walled carbon nanotubes (MWCNTs) by using the microwave plasma chemical vapor deposition (MPCVD). A H-2 and CH4 gas mixture with a 9:1 ratio was used as a precursor for the synthesis of MW-NTs on Ni-coated TiN/Si (100) substrates. The structure and composition of Ni catalyst nanoparticles were investigated using scanning electron microscopy (SEM) and cross-sectional transmission electron microscopy (XTEM) techniques. The present findings showed that denser Ni catalyst nanoparticles and more vertically aligned MWCNTs could be effectively achieved at higher pretreatment temperature during H-2 plasma. The results of Raman spectra and TEM indicate that the morphologies of MWCNTs transform from amorphous carbon to a crystalline graphite structure or finite-sized graphite structure, depending on the pretreatment temperature during H-2 plasma. In addition. TEM results sug!
gest that H-2 plasma pretreatment can effectively reduce the amorphous carbon and carbonaceous particles. A decrease in the number of defects and optimized morphologies therefore is believed to play a significant role in improving the field-emission characteristics observed in the future. (C) 2009 Elsevier B.V. All rights reserved.

Reprint Address:
Jian, SR, I Shou Univ, Dept Mat Sci & Engn, Kaohsiung 840, Taiwan.

Research Institution addresses:
I Shou Univ, Dept Mat Sci & Engn, Kaohsiung 840, Taiwan

E-mail Address:
srjian@gmail.com

Cited References:
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Cited Reference Count:
30

Times Cited:
0

Publisher:
ELSEVIER SCIENCE SA; PO BOX 564, 1001 LAUSANNE, SWITZERLAND

Subject Category:
Materials Science, Multidisciplinary

ISSN:
0254-0584

DOI:
10.1016/j.matchemphys.2009.02.018

IDS Number:
467ZX

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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: 22 OCT 2009
Number of Citing Articles: 4 new records this week (4 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Capillary rise of water in hydrophilic nanopores

Authors:
Gruener, S; Hofmann, T; Wallacher, D; Kityk, AV; Huber, P

Author Full Names:
Gruener, Simon; Hofmann, Tommy; Wallacher, Dirk; Kityk, Andriy V.; Huber, Patrick

Source:
PHYSICAL REVIEW E 79 (6): Art. No. 067301 Part 2 JUN 2009

Language:
English

Document Type:
Article

Author Keywords:
boundary layers; capillarity; capillary waves; flow through porous media; hydrophilicity; nanofluidics; nanoporous materials; silicon compounds; sorption; water

KeyWords Plus:
VYCOR GLASS; NEGATIVE PRESSURES; CARBON NANOTUBES; POROUS VYCOR; DYNAMICS; FLOW; NANOSCALE; LIQUIDS; NANOFLUIDICS; ADSORPTION

Abstract:
We report on the capillary rise of water in three-dimensional networks of hydrophilic silica pores with 3.5 nm and 5 nm mean radii, respectively (porous Vycor monoliths). We find classical square root of time Lucas-Washburn laws for the imbibition dynamics over the entire capillary rise times of up to 16 h investigated. Provided we assume two preadsorbed strongly bound layers of water molecules resting at the silica walls, which corresponds to a negative velocity slip length of -0.5 nm for water flow in silica nanopores, we can describe the filling process by a retained fluidity and capillarity of water in the pore center. This anticipated partitioning in two dynamic components reflects the structural-thermodynamic partitioning in strongly silica bound water layers and capillary condensed water in the pore center which is documented by sorption isotherm measurements.

Reprint Address:
Gruener, S, Univ Saarland, Fac Phys & Mechatron Engn, D-66041 Saarbrucken, Germany.

Research Institution addresses:
[Gruener, Simon; Hofmann, Tommy; Huber, Patrick] Univ Saarland, Fac Phys & Mechatron Engn, D-66041 Saarbrucken, Germany; [Wallacher, Dirk] Helmholtz Ctr Mat & Energy, D-14109 Berlin, Germany; [Kityk, Andriy V.] Czestochowa Univ Technol, Inst Comp Sci, PL-42220 Czestochowa, Poland

E-mail Address:
s.gruener@mx.uni-saarland.de; p.huber@physik.uni-saarland.de

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Cited Reference Count:
58

Times Cited:
0

Publisher:
AMER PHYSICAL SOC; ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA

Subject Category:
Physics, Fluids & Plasmas; Physics, Mathematical

ISSN:
1539-3755

DOI:
10.1103/PhysRevE.79.067301

IDS Number:
466XP

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

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Title:
Unorthodox Uses of Bennett's Acceptance Ratio Method

Authors:
Konig, G; Bruckner, S; Boresch, S

Author Full Names:
Koenig, Gerhard; Bruckner, Stefan; Boresch, Stefan

Source:
JOURNAL OF COMPUTATIONAL CHEMISTRY 30 (11): 1712-1718 Sp. Iss. SI AUG 2009

Language:
English

Document Type:
Article

Author Keywords:
free energy stimulation; acceptance ratio method; force field; implicit solvent

KeyWords Plus:
FREE-ENERGY SIMULATIONS; HISTOGRAM ANALYSIS METHOD; SOLVATION; DYNAMICS; WATER; EQUILIBRIUM; AVERAGES; PROTEINS; SYSTEMS

Abstract:
We illustrate the application of Bennett's acceptance ratio method (BAR) to problems in which standard methods to compute free energy differences (thermodynamic integration, exponential formula) are not practical. Our starting point is the observation that BAR can often compute the free energy difference between two states without the need for intermediate states usually employed (and necessary) in alchemical free energy simulations. This is demonstrated first for the free energy difference between ethane and methanol in aqueous solution. We then show how BAR can be used to compute directly rather unusual free energy differences, such as the free energy difference resulting from changing the treatment of electrostatic interactions, from switching the force field, or from using an implicit solvent model. Calculations of this kind should prove useful for force field development and the validation of implicit solvent methods. (C) 2009 Wiley Periodicals. Inc. J Comput Chem 30: 1!
712-1718, 2009

Reprint Address:
Boresch, S, Univ Vienna, Dept Computat Biol Chem, Wahringerstr 17, A-1090 Vienna, Austria.

Research Institution addresses:
[Koenig, Gerhard; Bruckner, Stefan; Boresch, Stefan] Univ Vienna, Dept Computat Biol Chem, A-1090 Vienna, Austria

E-mail Address:
stefan@mdy.univie.ac.at

Cited References:
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Cited Reference Count:
36

Times Cited:
0

Publisher:
JOHN WILEY & SONS INC; 111 RIVER ST, HOBOKEN, NJ 07030 USA

Subject Category:
Chemistry, Multidisciplinary

ISSN:
0192-8651

DOI:
10.1002/jcc.21255

IDS Number:
464KS

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

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Title:
Transport properties and induced voltage in the structure of water-filled single-walled boron-nitrogen nanotubes

Authors:
Yuan, QZ; Zhao, YP

Author Full Names:
Yuan, Quanzi; Zhao, Ya-Pu

Source:
BIOMICROFLUIDICS 3 (2): Art. No. 022411 APR-JUN 2009

Language:
English

Document Type:
Proceedings Paper

Author Keywords:
boron compounds; density functional theory; diffusion; III-V semiconductors; molecular dynamics method; nanofluidics; pipe flow; semiconductor nanotubes; wide band gap semiconductors

KeyWords Plus:
CARBON NANOTUBES; MOLECULAR-DYNAMICS; NITRIDE NANOTUBES; CHANNEL; FLOW; LIQUIDS

Abstract:
Density functional theory/molecular dynamics simulations were employed to give insights into the mechanism of voltage generation based on a water-filled single-walled boron-nitrogen nanotube (SWBNNT). Our calculations showed that (1) the transport properties of confined water in a SWBNNT are different from those of bulk water in view of configuration, the diffusion coefficient, the dipole orientation, and the density distribution, and (2) a voltage difference of several millivolts would generate between the two ends of a SWBNNT due to interactions between the water dipole chains and charge carriers in the tube. Therefore, this structure of a water-filled SWBNNT can be a promising candidate for a synthetic nanoscale power cell as well as a practical nanopower harvesting device.

Reprint Address:
Zhao, YP, Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China.

Research Institution addresses:
[Yuan, Quanzi; Zhao, Ya-Pu] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China

E-mail Address:
yzhao@imech.ac.cn

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Cited Reference Count:
28

Times Cited:
1

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

Subject Category:
Biophysics; Nanoscience & Nanotechnology; Physics, Fluids & Plasmas

ISSN:
1932-1058

DOI:
10.1063/1.3158618

IDS Number:
465PW

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Title:
Self-Diffusion of Water and Simple Alcohols in Single-Walled Aluminosilicate Nanotubes

Authors:
Zang, J; Konduri, S; Nair, S; Sholl, DS

Author Full Names:
Zang, Ji; Konduri, Suchitra; Nair, Sankar; Sholl, David S.

Source:
ACS NANO 3 (6): 1548-1556 JUN 2009

Language:
English

Document Type:
Article

Author Keywords:
inorganic nanotubes; aluminosilicate; self-diffusion; water; methanol; ethanol

KeyWords Plus:
MIXED-OXIDE NANOTUBES; FAST MASS-TRANSPORT; CARBON NANOTUBE; IMOGOLITE NANOTUBES; CORRELATED FLIGHTS; MEMBRANES; MODELS; NANOPARTICLES; RESISTANCES; DIMENSIONS

Abstract:
Understanding transport phenomena of fluids through nanotubes (NTs) is of great interest in order to enable potential application of NTs as separation devices, encapsulation media for molecule storage and delivery, and sensors. Single-walled metal oxide NTs are interesting materials because they present a well-defined solid-state structure, precisely tunable diameter and length, as well as a hydrophilic and functionalizable interior for tuning transport and adsorption selectivity. Here, we study the transport properties of hydrogen-bonding liquids (water, methanol, and ethanol) through a single-walled aluminosilicate NT to investigate the influence of liquid-surface and liquid-liquid interactions and the effects of competitive transport of different chemical species using molecular dynamics (MD) simulations. The self-diffusivities (D-s) for all the three species decrease with increasing loading and are comparable to bulk liquid diffusivities at low molecular loadings. We sho!
w that the hydrogen-bond network associated with water makes its diffusion behavior different from methanol and ethanol. Mixtures of water and methanol show segregation in the NT, with water located closer to the tube wall and the alcohol molecules localized near the center of the NT. D, values of water in an analogous aluminogermanate NT are larger than those in the aluminosilicate NT due to a larger pore diameter.

Reprint Address:
Sholl, DS, Georgia Inst Technol, Sch Chem & Biomol Engn, 311 Ferst Dr NW, Atlanta, GA 30332 USA.

Research Institution addresses:
[Zang, Ji; Konduri, Suchitra; Nair, Sankar; Sholl, David S.] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

E-mail Address:
david.sholl@chbe.gatech.edu

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Cited Reference Count:
37

Times Cited:
0

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

Subject Category:
Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary

ISSN:
1936-0851

DOI:
10.1021/nn9001837

IDS Number:
464UP

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Cited Article: Ghosh, S. Carbon nanotube flow sensors
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Title:
Renormalization of the phonon spectrum in semiconducting single-walled carbon nanotubes studied by Raman spectroscopy

Authors:
Das, A; Sood, AK

Author Full Names:
Das, Anindya; Sood, A. K.

Source:
PHYSICAL REVIEW B 79 (23): Art. No. 235429 JUN 2009

Language:
English

Document Type:
Article

KeyWords Plus:
TRANSISTOR; GRAPHENE; SCATTERING; FILMS

Abstract:
In situ Raman experiments together with transport measurements have been carried out in single-walled carbon nanotubes as a function of electrochemical top gate voltage (V-g). We have used the green laser (E-L = 2.41 eV), where the semiconducting nanotubes of diameter similar to 1.4 nm are in resonance condition. In semiconducting nanotubes, the G(-)- and G(+)-mode frequencies increase by similar to 10 cm(-1) for hole doping, the frequency shift of the G(-) mode is larger compared to the G(+) mode at the same gate voltage. However, for electron doping the shifts are much smaller: G(-) upshifts by only similar to 2 cm(-1) whereas the G(+) does not shift. The transport measurements are used to quantify the Fermi-energy shift (E-F) as a function of the gate voltage. The electron-hole asymmetry in G- and G+ modes is quantitatively explained using nonadiabatic effects together with lattice relaxation contribution. The electron-phonon coupling matrix elements of transverse-optic (!
G(-)) and longitudinal-optic (G(+)) modes explain why the G- mode is more blueshifted compared to the G(+) mode at the same V-g. The D and 2D bands have different doping dependence compared to the G(+) and G(-) bands. There is a large downshift in the frequency of the 2D band (similar to 18 cm(-1)) and D (similar to 10 cm(-1)) band for electron doping, whereas the 2D band remains constant for the hole doping but D upshifts by similar to 8 cm(-1). The doping dependence of the overtone of the G bands (2G bands) shows behavior similar to the dependence of the G+ and G(-) bands.

Reprint Address:
Das, A, Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India.

Research Institution addresses:
[Das, Anindya; Sood, A. K.] Indian Inst Sci, Dept Phys, Bangalore 560012, Karnataka, India

E-mail Address:
asood@physics.iisc.ernet.in

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Cited Reference Count:
40

Times Cited:
0

Publisher:
AMER PHYSICAL SOC; ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA

Subject Category:
Physics, Condensed Matter

ISSN:
1098-0121

DOI:
10.1103/PhysRevB.79.235429

IDS Number:
466XU

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

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Title:
Large-scale production and metrology of vertically aligned carbon nanotube films

Authors:
Dai, L; Wang, P; Bosnick, K

Author Full Names:
Dai, Lei; Wang, Peter; Bosnick, Ken

Source:
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A 27 (4): 1071-1075 JUL 2009

Language:
English

Document Type:
Proceedings Paper

Author Keywords:
carbon nanotubes; chemical vapour deposition; chromium; electron microscopy; iron; measurement standards; metallic thin films; multilayers; nanotechnology; nickel; quality control; thin films

KeyWords Plus:
CHEMICAL-VAPOR-DEPOSITION; GROWTH; SENSORS

Abstract:
The authors have produced carbon nanotube (CNT) films on a large scale in a commercial chemical vapor deposition (CVD) reactor. The reactor (built by Tystar, Inc) is the first of its kind and is capable of handling up to 50 150 mm wafers simultaneously with industry standard process control. Electron microscopy reveals that the CNT films consist of densely packed and vertically aligned multiwalled CNTs. A variety of catalysts and reaction conditions were systematically tested. Both Fe films and Cr/Ni/Fe film stacks have been found favorable for the growth of aligned CNT films. While electron microscopy provides invaluable information, it is qualitative and unsuitable for process optimization and industrial quality control. A quantitative metrology standard is required for these purposes, but has to date not been explicitly defined. They report on their initial developments toward this metrology standard, considering such factors as film thickness (or CNT length), CNT wall nu!
mber and diameter, amorphous carbon content, and uniformity. Various measurement techniques have been investigated and are discussed. The developed metrology will facilitate quality control and process optimization necessary for industry applications of CNT films.

Reprint Address:
Dai, L, Natl Res Council Canada, Appl Nanomat Technol Team, Natl Inst Nanotechnol, 11421 Saskatchewan Dr, Edmonton, AB T6G 2M9, Canada.

Research Institution addresses:
[Dai, Lei; Wang, Peter; Bosnick, Ken] Natl Res Council Canada, Appl Nanomat Technol Team, Natl Inst Nanotechnol, Edmonton, AB T6G 2M9, Canada

E-mail Address:
ken.bosnick@nrc.ca

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CHEN B, 2005, CARBON, V43, P3172, DOI 10.1016/j.carbon.2005.06.024.
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Cited Reference Count:
22

Times Cited:
0

Publisher:
A V S AMER INST PHYSICS; STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA

Subject Category:
Materials Science, Coatings & Films; Physics, Applied

ISSN:
0734-2101

DOI:
10.1116/1.3148827

IDS Number:
465PT

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

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Title:
Transport properties and induced voltage in the structure of water-filled single-walled boron-nitrogen nanotubes

Authors:
Yuan, QZ; Zhao, YP

Author Full Names:
Yuan, Quanzi; Zhao, Ya-Pu

Source:
BIOMICROFLUIDICS 3 (2): Art. No. 022411 APR-JUN 2009

Language:
English

Document Type:
Proceedings Paper

Author Keywords:
boron compounds; density functional theory; diffusion; III-V semiconductors; molecular dynamics method; nanofluidics; pipe flow; semiconductor nanotubes; wide band gap semiconductors

KeyWords Plus:
CARBON NANOTUBES; MOLECULAR-DYNAMICS; NITRIDE NANOTUBES; CHANNEL; FLOW; LIQUIDS

Abstract:
Density functional theory/molecular dynamics simulations were employed to give insights into the mechanism of voltage generation based on a water-filled single-walled boron-nitrogen nanotube (SWBNNT). Our calculations showed that (1) the transport properties of confined water in a SWBNNT are different from those of bulk water in view of configuration, the diffusion coefficient, the dipole orientation, and the density distribution, and (2) a voltage difference of several millivolts would generate between the two ends of a SWBNNT due to interactions between the water dipole chains and charge carriers in the tube. Therefore, this structure of a water-filled SWBNNT can be a promising candidate for a synthetic nanoscale power cell as well as a practical nanopower harvesting device.

Reprint Address:
Zhao, YP, Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China.

Research Institution addresses:
[Yuan, Quanzi; Zhao, Ya-Pu] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China

E-mail Address:
yzhao@imech.ac.cn

Cited References:
BLASE X, 1994, EUROPHYS LETT, V28, P335.
CHEN Y, 2004, APPL PHYS LETT, V84, P2430, DOI 10.1063/1.1667278.
FRISCH MJ, 2004, GAUSSIAN03 REVISION.
GHOSH S, 2003, SCIENCE, V299, P1042, DOI 10.1126/science.1079080.
GHOSH S, 2004, PHYS REV B, V70, P5423.
HOCKNEY RW, 1989, COMPUTER SIMULATION.
HUMMER G, 2001, NATURE, V414, P188.
JORGENSEN WL, 1983, J CHEM PHYS, V79, P926.
KALRA A, 2003, P NATL ACAD SCI USA, V100, P10175.
KRAL P, 2001, PHYS REV LETT, V86, P131.
LI JY, 2007, P NATL ACAD SCI USA, V104, P3687, DOI 10.1073/pnas.0604541104.
LIU YC, 2005, PHYS REV B, V104.
MAJUMDER M, 2005, NATURE, V438, P44, DOI 10.1038/43844a.
MANN DJ, 2003, PHYS REV LETT, V90, P5503.
MASHL RJ, 2003, NANO LETT, V3, P589, DOI 10.1021/nl0340226.
MATTIA D, 2008, MICROFLUID NANOFLUID, V5, P289, DOI 10.1007/s10404-008-0293-5.
NOY A, 2007, NANO TODAY, V2, P22.
PLIMPTON S, 1995, J COMPUT PHYS, V117, P1.
SUN H, 1998, J PHYS CHEM B, V102, P7338.
WAGHE A, 2002, J CHEM PHYS, V117, P10789, DOI 10.1063/1.1519861.
WAN RZ, 2005, J AM CHEM SOC, V127, P7166, DOI 10.1021/ja050044d.
WHITBY M, 2007, NAT NANOTECHNOL, V2, P87, DOI 10.1038/nnano.2006.175.
WON CY, 2006, J CHEM PHYS, V125, P14701.
WON CY, 2007, J AM CHEM SOC, V129, P2748, DOI 10.1021/ja0687318.
WON CY, 2008, J PHYS CHEM C, V112, P1812, DOI 10.1021/jp076747u.
YUAN OZ, 2009, J AM CHEM SOC, V131, P6374.
ZHAO YC, 2008, ADV MATER, V20, P1772, DOI 10.1002/adma.200702956.
ZHU FQ, 2002, BIOPHYS J, V83, P154.

Cited Reference Count:
28

Times Cited:
1

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

Subject Category:
Biophysics; Nanoscience & Nanotechnology; Physics, Fluids & Plasmas

ISSN:
1932-1058

DOI:
10.1063/1.3158618

IDS Number:
465PW

========================================================================
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ISI Web of Knowledge Alert - Zhao, Y

ISI Web of Knowledge Citation Alert

Cited Article: Zhao, Y. Individual water-filled single-walled carbon nanotubes as hydroelectric power converters
Alert Expires: 22 OCT 2009
Number of Citing Articles: 1 new records this week (1 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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*Record 1 of 1.
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*Order Full Text [ ]

Title:
Transport properties and induced voltage in the structure of water-filled single-walled boron-nitrogen nanotubes

Authors:
Yuan, QZ; Zhao, YP

Author Full Names:
Yuan, Quanzi; Zhao, Ya-Pu

Source:
BIOMICROFLUIDICS 3 (2): Art. No. 022411 APR-JUN 2009

Language:
English

Document Type:
Proceedings Paper

Author Keywords:
boron compounds; density functional theory; diffusion; III-V semiconductors; molecular dynamics method; nanofluidics; pipe flow; semiconductor nanotubes; wide band gap semiconductors

KeyWords Plus:
CARBON NANOTUBES; MOLECULAR-DYNAMICS; NITRIDE NANOTUBES; CHANNEL; FLOW; LIQUIDS

Abstract:
Density functional theory/molecular dynamics simulations were employed to give insights into the mechanism of voltage generation based on a water-filled single-walled boron-nitrogen nanotube (SWBNNT). Our calculations showed that (1) the transport properties of confined water in a SWBNNT are different from those of bulk water in view of configuration, the diffusion coefficient, the dipole orientation, and the density distribution, and (2) a voltage difference of several millivolts would generate between the two ends of a SWBNNT due to interactions between the water dipole chains and charge carriers in the tube. Therefore, this structure of a water-filled SWBNNT can be a promising candidate for a synthetic nanoscale power cell as well as a practical nanopower harvesting device.

Reprint Address:
Zhao, YP, Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China.

Research Institution addresses:
[Yuan, Quanzi; Zhao, Ya-Pu] Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech LNM, Beijing 100190, Peoples R China

E-mail Address:
yzhao@imech.ac.cn

Cited References:
BLASE X, 1994, EUROPHYS LETT, V28, P335.
CHEN Y, 2004, APPL PHYS LETT, V84, P2430, DOI 10.1063/1.1667278.
FRISCH MJ, 2004, GAUSSIAN03 REVISION.
GHOSH S, 2003, SCIENCE, V299, P1042, DOI 10.1126/science.1079080.
GHOSH S, 2004, PHYS REV B, V70, P5423.
HOCKNEY RW, 1989, COMPUTER SIMULATION.
HUMMER G, 2001, NATURE, V414, P188.
JORGENSEN WL, 1983, J CHEM PHYS, V79, P926.
KALRA A, 2003, P NATL ACAD SCI USA, V100, P10175.
KRAL P, 2001, PHYS REV LETT, V86, P131.
LI JY, 2007, P NATL ACAD SCI USA, V104, P3687, DOI 10.1073/pnas.0604541104.
LIU YC, 2005, PHYS REV B, V104.
MAJUMDER M, 2005, NATURE, V438, P44, DOI 10.1038/43844a.
MANN DJ, 2003, PHYS REV LETT, V90, P5503.
MASHL RJ, 2003, NANO LETT, V3, P589, DOI 10.1021/nl0340226.
MATTIA D, 2008, MICROFLUID NANOFLUID, V5, P289, DOI 10.1007/s10404-008-0293-5.
NOY A, 2007, NANO TODAY, V2, P22.
PLIMPTON S, 1995, J COMPUT PHYS, V117, P1.
SUN H, 1998, J PHYS CHEM B, V102, P7338.
WAGHE A, 2002, J CHEM PHYS, V117, P10789, DOI 10.1063/1.1519861.
WAN RZ, 2005, J AM CHEM SOC, V127, P7166, DOI 10.1021/ja050044d.
WHITBY M, 2007, NAT NANOTECHNOL, V2, P87, DOI 10.1038/nnano.2006.175.
WON CY, 2006, J CHEM PHYS, V125, P14701.
WON CY, 2007, J AM CHEM SOC, V129, P2748, DOI 10.1021/ja0687318.
WON CY, 2008, J PHYS CHEM C, V112, P1812, DOI 10.1021/jp076747u.
YUAN OZ, 2009, J AM CHEM SOC, V131, P6374.
ZHAO YC, 2008, ADV MATER, V20, P1772, DOI 10.1002/adma.200702956.
ZHU FQ, 2002, BIOPHYS J, V83, P154.

Cited Reference Count:
28

Times Cited:
1

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

Subject Category:
Biophysics; Nanoscience & Nanotechnology; Physics, Fluids & Plasmas

ISSN:
1932-1058

DOI:
10.1063/1.3158618

IDS Number:
465PW

========================================================================
*Order Full Text*
All Customers
--------------
Please contact your library administrator, or person(s) responsible for
document delivery, to find out more about your organization's policy for
obtaining the full text of the above articles. If your organization does
not have a current document delivery provider, your administrator can
contact ISI Document Solution at service@isidoc.com, or call 800-603-4367
or 734-459-8565.

IDS Customers
--------------
IDS customers can purchase the full text of an article (having page number,
volume, and issue information) by returning this ENTIRE message as a Reply
to Sender or Forward to orders@isidoc.com. Mark your choices with an X in
the "Order Full Text: []" brackets for each item. For example, [X].

Please enter your account number here:

========================================================================
*Help Desk Contact Information*
If you have any questions, please visit the Thomson Scientific Technical Support Contact Information Web page:
http://www.thomsonscientific.com/support/techsupport
========================================================================