Cited Article: Majumder M. Nanoscale hydrodynamics - Enhanced flow in carbon nanotubes
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:
Effects of Cosolvents on the Hydration of Carbon Nanotubes
Authors:
Yang, LJ; Gao, YQ
Author Full Names:
Yang, Lijiang; Gao, Yi Qin
Source:
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 132 (2): 842-848 JAN 20 2010
Language:
English
Document Type:
Article
KeyWords Plus:
AQUEOUS UREA SOLUTIONS; MOLECULAR-DYNAMICS; HYDROPHOBIC INTERACTIONS; WATER; PROTEINS; DENATURATION; TRANSPORT; STABILITY; MECHANISM; SYSTEMS
Abstract:
Molecular dynamics simulations of a nonpolar single-walled carbon nanotube (SWNT) solvated in aqueous solutions of urea, methanol, and trimethylamine N-oxide (TMAO) show clearly the effects of cosolvents on the hydration of the interior of the SWNT. The size of the SWNT was chosen to be small enough that water but not the cosolvent molecules can penetrate into its interior. Urea as a protein denaturant improves hydration of the interior of the SWNT, while the protein protectant TMAO dehydrates the SWNT. The interior of the SWNT is also dehydrated when methanol is added to the solution. The analysis of interaction energies of the water confined inside the SWNT pore shows that the stability of the confined water in the methanol and TMAO solutions mainly depends on electrostatic interactions. In contrast, both van der Waals and electrostatic interactions were shown to be important in stabilizing the confined water when the SWNT is immersed in the urea solution.
Reprint Address:
Gao, YQ, Texas A&M Univ, Dept Chem, POB 30012, College Stn, TX 77842 USA.
Research Institution addresses:
[Yang, Lijiang; Gao, Yi Qin] Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA
E-mail Address:
yiqin@mail.chem.tamu.edu
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Cited Reference Count:
30
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/ja9091825
IDS Number:
562VY
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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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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:
Rapid Transport of Water via a Carbon Nanotube Syringe
Authors:
Rivera, JL; Starr, FW
Author Full Names:
Rivera, Jose L.; Starr, Francis W.
Source:
JOURNAL OF PHYSICAL CHEMISTRY C 114 (9): 3737-3742 MAR 11 2010
Language:
English
Document Type:
Article
KeyWords Plus:
MOLECULAR-DYNAMICS; FLOW; CONDUCTION; MEMBRANES; CHANNEL; FILMS
Abstract:
The controlled flow of water molecules at the nanoscale is an initial step to many fluidic processes ill nanotechnology. Here we show how thin films of water call be drawn through a nanosyringe built from a carbon nanotube membrane and a "plunger". By increasing the speed of withdrawal of the plunger, we call obtain Molecular transport through the membrane at flux rates exceeding 1()25 molecules cm(-2) s(-1). Above I threshold speed around 0.25 nm/ns (25 cm/s), molecules cannot fill the chamber created by the plunger motion as fast as the chamber expands, and the resulting flux rate drops. By considering hydrophobic or hydrophilic Plungers, we unexpectedly find that the nature of the water-plunger interactions does not affect the flux rate or the threshold plunger speed. While the water structure near the plunger Surface differs significantly For different plunger interactions, the failure of the film away From the plunger surface is responsible for loss of transport. As I r!
esult, the surface interactions play a limited role in controlling the flux.
Reprint Address:
Starr, FW, Wesleyan Univ, Dept Phys, Middletown, CT 06457 USA.
Research Institution addresses:
[Rivera, Jose L.; Starr, Francis W.] Wesleyan Univ, Dept Phys, Middletown, CT 06457 USA; [Rivera, Jose L.] Univ Nacl Autonoma Mexico, Inst Invest Mat, Mexico City 04510, DF, Mexico
E-mail Address:
joserivera@iim.unam.mx; fstarr@wesleyan.edu
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Cited Reference Count:
33
Times Cited:
0
Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
ISSN:
1932-7447
DOI:
10.1021/jp906527c
IDS Number:
562JG
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