Cited Article: Ghosh, S. Carbon nanotube flow sensors
Alert Expires: 09 NOV 2010
Number of Citing Articles: 3 new records this week (3 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Friction force on slow charges moving over supported graphene
Authors:
Allison, KF; Miskovic, ZL
Author Full Names:
Allison, K. F.; Miskovic, Z. L.
Source:
NANOTECHNOLOGY 21 (13): Art. No. 134017 APR 2 2010
Language:
English
Document Type:
Article
KeyWords Plus:
IMPURITY SCATTERING; EPITAXIAL GRAPHENE; SOLID-SURFACE; PARTICLES; IONS; BEHAVIOR; PHONONS; BANDGAP
Abstract:
We provide a theoretical model that describes the dielectric coupling of a two-dimensional (2D) layer of graphene, represented by a polarization function in the random phase approximation, and a semi-infinite three-dimensional (3D) substrate, represented by a surface response function in a non-local formulation. We concentrate on the role of the dynamic response of the substrate for low-frequency excitations of the combined graphene-substrate system, which give rise to the stopping force on slowly moving charges above doped graphene. A comparison of the dielectric loss function with experimental high-resolution electron energy loss spectroscopy (HREELS) data for graphene on a SiC substrate is used to estimate the effects of damping rate and the local field correction in graphene, as well as to reveal the importance of phonon excitations in an insulating substrate. While the local field correction and linearly dispersing damping rate did not yield any important effects compar!
ed to the constant damping rate in graphene, a strong signature of the hybridization between graphene's p plasmon and the substrate's phonon is found in both the HREELS spectra and the stopping force. A friction coefficient that is calculated for slow charges moving above graphene on a metallic substrate shows an interplay between the low-energy single-particle excitations in both systems.
Reprint Address:
Allison, KF, Univ Waterloo, Dept Appl Math, Waterloo, ON N2L 3G1, Canada.
Research Institution addresses:
[Allison, K. F.; Miskovic, Z. L.] Univ Waterloo, Dept Appl Math, Waterloo, ON N2L 3G1, Canada
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Cited Reference Count:
41
Times Cited:
0
Publisher:
IOP PUBLISHING LTD; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND
Subject Category:
Engineering, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied
ISSN:
0957-4484
DOI:
10.1088/0957-4484/21/13/134017
IDS Number:
564UD
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Title:
A Controllable Molecular Sieve for Na+ and K+ Ions
Authors:
Gong, XJ; Li, JC; Xu, K; Wang, JF; Yang, H
Author Full Names:
Gong, Xiaojing; Li, Jichen; Xu, Ke; Wang, Jianfeng; Yang, Hui
Source:
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 132 (6): 1873-1877 FEB 17 2010
Language:
English
Document Type:
Article
KeyWords Plus:
CARBON NANOTUBE MEMBRANES; POTASSIUM CHANNELS; MASS-TRANSPORT; WATER CHANNEL; SELECTIVITY; CONDUCTION; FLOW; NANOPORES
Abstract:
The selective rate of specific ion transport across nanoporous material is critical to biological and nanofluidic systems Molecular sieves for ions can be achieved by steric and electrical effects However, the radii of Na+ and K+ are quite similar, they both carry a positive charge, making them difficult to separate Biological ionic channels contain precisely arranged arrays of amino acids that can efficiently recognize and guide the passage of K+ or Na+ across the cell membrane However, the design of inorganic channels with novel recognition mechanisms that control the ionic selectivity remains a challenge. We present here a design for a controllable ion-selective nanopore (molecular sieve) based on a single-walled carbon nanotube with specially arranged carbonyl oxygen atoms modified inside the nanopore, which was inspired by the structure of potassium channels in membrane spanning proteins (e g, KcsA) Our molecular dynamics simulations show that the remarkable selectivity!
is attributed to the hydration structure of Na+ or K+ confined in the nanochannels, which can be precisely tuned by different patterns of the carbonyl oxygen atoms The results also suggest that a confined environment plays a dominant role in the selectivity process. These studies provide a better understanding of the mechanism of ionic selectivity in the KcsA channel and possible technical applications in nanotechnology and biotechnology, including serving as a laboratory-in-nanotube for special chemical interactions and as a high-efficiency nanodevice for purification or desalination of sea and brackish water
Reprint Address:
Gong, XJ, Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, Suzhou 215125, Peoples R China.
Research Institution addresses:
[Gong, Xiaojing; Xu, Ke; Wang, Jianfeng; Yang, Hui] Chinese Acad Sci, Suzhou Inst Nanotech & Nanobion, Suzhou 215125, Peoples R China; [Yang, Hui] Univ Sci & Technol China, Dept Phys, Hefei 230026, Peoples R China; [Li, Jichen] Univ Manchester, Dept Phys & Astron, Manchester M13 9PL, Lancs, England
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Cited Reference Count:
38
Times Cited:
0
Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
Chemistry, Multidisciplinary
ISSN:
0002-7863
DOI:
10.1021/ja905753p
IDS Number:
562WC
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Title:
Growth process and mechanism of a multi-walled carbon nanotube nest deposited on a silicon nanoporous pillar array
Authors:
Jiang, WF; Jian, L; Yang, XH; Li, XJ
Author Full Names:
Jiang, Wei Fen; Jian, Lv; Yang, Xiao Hui; Li, Xin Jian
Source:
APPLIED SURFACE SCIENCE 256 (10): 3035-3039 MAR 1 2010
Language:
English
Document Type:
Article
Author Keywords:
Nest array of multi-walled carbon nanotubes; Silicon nanoporous pillar array; Growth mechanism
KeyWords Plus:
FIELD-EMISSION; TEMPERATURE; DECOMPOSITION; CATALYST
Abstract:
A large scale nest array of multi-walled carbon nanotubes (NACNTs) was grown on silicon nanoporous pillar array (Si-NPA) by thermal chemical vapor deposition. Through observing its macro/micromorphology and structure, ascertaining the catalyst component and its locations at different growth time by hiring field emission scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, and selected area electron diffraction, the growth process was deduced. Its thermal properties were also investigated by using a thermogravimetric analyzer. Our experiments demonstrated that the CNTs growth by means of root-growth mechanism at the initial growth stage, then a continuous growth process with its tip open is suggested, finally, a schematic growth model of NACNT/Si-NPA was presented. (C) 2009 Elsevier B.V. All rights reserved.
Reprint Address:
Jiang, WF, N China Inst Water Conservancy & Hydroelect Power, Dept Math & Informat Sci, 36 Beihuan Rd, Zhengzhou 450011, Peoples R China.
Research Institution addresses:
[Jiang, Wei Fen; Jian, Lv; Yang, Xiao Hui] N China Inst Water Conservancy & Hydroelect Power, Dept Math & Informat Sci, Zhengzhou 450011, Peoples R China; [Li, Xin Jian] Zhengzhou Univ, Dept Phys, Zhengzhou 450052, Peoples R China; [Li, Xin Jian] Zhengzhou Univ, Phys Mat Lab, Zhengzhou 450052, Peoples R China
E-mail Address:
gingerwfj@yahoo.com.cn
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Cited Reference Count:
24
Times Cited:
0
Publisher:
ELSEVIER SCIENCE BV; PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Subject Category:
Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter
ISSN:
0169-4332
DOI:
10.1016/j.apsusc.2009.11.069
IDS Number:
564RL
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