Cited Article: Hummer, G. Water conduction through the hydrophobic channel of a carbon nanotube
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Title:
Retardation of Liquid Indium Flow in Indium Oxide Nanotubes
Authors:
Kumar, M; Singh, VN; Mehta, BR; Singh, JP
Author Full Names:
Kumar, Mukesh; Singh, Vidya N.; Mehta, Bodh R.; Singh, Jitendra P.
Source:
JOURNAL OF PHYSICAL CHEMISTRY C 114 (7): 2891-2895 FEB 25 2010
Language:
English
Document Type:
Article
KeyWords Plus:
CARBON NANOTUBES; FLUID-FLOW; TEMPERATURE; NANOTHERMOMETER; SOLUBILITY; TRANSPORT; METALS; WATER
Abstract:
High-resolution transmission electron microscopy and energy-dispersive X-ray analysis carried out oil indium oxide nanotubes grown by a chemical vapor deposition technique show the presence of indium metal segments along the indium oxide (IO) nanotube axis having one end closed. A real-time HRTEM video In continuous mode imaging has been carried Out to study the directional now of liquid indium. Electron-beam-induced heating results in the increase ill indium vapor pressure and desorption of gases at the closed end of the IO nanotubes. This buildup of differential pressure between open and closed columns leads to the now of indium away from the closed end of the IO nanotube. Interestingly, the indium flow rate was observed to decrease from 2.8 to 0.3 nm/s with a corresponding decrease in the nanotubes' diameter from 138 to 38 nm. This Study indicates that the wetting properties of the liquid-host nanotube interface critically decides the fluid dynamics at nanoscale, and depe!
nding upon the interfacial properties, enhancement or retardation of flow call be observed oil the reduction of the nanotube diameter.
Reprint Address:
Mehta, BR, Indian Inst Technol Delhi, Dept Phys, New Delhi 110016, India.
Research Institution addresses:
[Kumar, Mukesh; Singh, Vidya N.; Mehta, Bodh R.; Singh, Jitendra P.] Indian Inst Technol Delhi, Dept Phys, New Delhi 110016, India
E-mail Address:
brmehta@physics.iitd.ac.in; jpsingh@physics.iitd.ac.in
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Cited Reference Count:
40
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/jp910252f
IDS Number:
556GQ
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Title:
Carbon Nanotubes Anchored to Silicon for Device Fabrication
Authors:
Constantopoulos, KT; Shearer, CJ; Ellis, AV; Voelcker, NH; Shapter, JC
Author Full Names:
Constantopoulos, Kristina T.; Shearer, Cameron J.; Ellis, Amanda V.; Voelcker, Nicolas H.; Shapter, Joseph C.
Source:
ADVANCED MATERIALS 22 (5): 557-571 FEB 2 2010
Language:
English
Document Type:
Review
KeyWords Plus:
CHEMICAL-VAPOR-DEPOSITION; FAST MASS-TRANSPORT; FIELD-EMISSION; POLY(SILYL ESTER)S; MEMBRANE EQUILIBRIA; RAMAN-SPECTROSCOPY; NANOFIBER ARRAYS; MAMMALIAN-CELLS; POROUS SILICON; SINGLE
Abstract:
This report highlights recent progress in the fabrication of vertically aligned carbon nanotubes (VA-CNTs) on silicon-based materials. Research into these nanostructured composite materials is spurred by the importance of silicon as a basis for most current devices and the disruptive properties of CNTs. Various CNT attachments methods of covalent and adsorptive nature are critically compared. Selected examples of device applications where the VA-CNT on silicon assemblies are showing particular promise are discussed. These applications include field emitters, filtration membranes, dry adhesives, sensors and scaffolds for biointerfaces.
Reprint Address:
Shapter, JC, Flinders Univ S Australia, Sch Chem Phys & Earth Sci, GPO Box 2100, Bedford Pk, SA 5042, Australia.
Research Institution addresses:
[Constantopoulos, Kristina T.; Shearer, Cameron J.; Ellis, Amanda V.; Voelcker, Nicolas H.; Shapter, Joseph C.] Flinders Univ S Australia, Sch Chem Phys & Earth Sci, Bedford Pk, SA 5042, Australia
E-mail Address:
joe.shapter@flinders.edu.au
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Cited Reference Count:
173
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:
0935-9648
DOI:
10.1002/adma.200900945
IDS Number:
556TP
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Title:
Role of Surfactants in Carbon Nanotubes Density Gradient Separation
Authors:
Carvalho, EJF; dos Santos, MC
Author Full Names:
Carvalho, Elton J. F.; dos Santos, Maria Cristina
Source:
ACS NANO 4 (2): 765-770 FEB 2010
Language:
English
Document Type:
Article
Author Keywords:
molecular dynamics; carbon nanotube density; surfactants
KeyWords Plus:
WATER; DYNAMICS; SIMULATIONS; AMPHIPHILES
Abstract:
Several strategies aimed at sorting single-walled carbon nanotubes (SWNT) by diameter and/or electronic structure have been developed in recent years. A nondestructive sorting method was recently proposed in which nanotube bundles are dispersed in water-surfactant solutions and submitted to ultracentrifugation in a density gradient. By this method, SWNTs of different diameters are distributed according to their densities along the centrifuge tube. A mixture of two anionic amphiphiles, namely sodium dodecylsulfate (SIDS) and sodium cholate (SC), presented the best performance in discriminating nanotubes by diameter. We present molecular dynamics studies of the water-surfactant-SWNT system. The simulations revealed one aspect of the discriminating power of surfactants: they can actually be attracted toward the interior of the nanotube cage. The binding energies of SDS and SC on the outer nanotube surface are very similar and depend weakly on diameter. The binding inside the tu!
bes, on the contrary, is strongly diameter dependent: SDS fits best inside tubes with diameters ranging from 8 to 9 angstrom, while SC is best accommodated in larger tubes, with diameters in the range 10.5-12 angstrom. The dynamics at room temperature showed that, as the amphiphile moves to the hollow cage, water molecules are dragged together, thereby promoting the nanotube filling. The resulting densities of filled SWNT are in agreement with measured densities.
Reprint Address:
dos Santos, MC, Univ Sao Paulo, Inst Fis, Dept Fis Mat & Mecan, BR-05315970 Sao Paulo, Brazil.
Research Institution addresses:
[Carvalho, Elton J. F.; dos Santos, Maria Cristina] Univ Sao Paulo, Inst Fis, Dept Fis Mat & Mecan, BR-05315970 Sao Paulo, Brazil
E-mail Address:
mcsantos@if.usp.br
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Publisher:
AMER CHEMICAL SOC; 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
Subject Category:
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ISSN:
1936-0851
DOI:
10.1021/nn901350s
IDS Number:
556ZI
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Title:
Single-File Diffusion of Water Inside Narrow Carbon Nanorings
Authors:
Mukherjee, B; Maiti, PK; Dasgupta, C; Sood, AK
Author Full Names:
Mukherjee, Biswaroop; Maiti, Prabal K.; Dasgupta, Chandan; Sood, A. K.
Source:
ACS NANO 4 (2): 985-991 FEB 2010
Language:
English
Document Type:
Article
Author Keywords:
water; carbon; nanotube; nanoring; single-file diffusion; hydrophobicity; transport; hydrogen bond
KeyWords Plus:
ONE-DIMENSIONAL DIFFUSION; LONG-TIME LIMIT; NANOTUBES; CHANNEL; EQUILIBRIUM; CONFINEMENT; BOUNDARIES; PARTICLES; KINETICS; LATTICE
Abstract:
We use atomistic molecular dynamics (MD) simulations to study the diffusion of water molecules confined inside narrow (6,6) carbon nanorings. The water molecules form two oppositely polarized chains. It is shown that the effective interaction between these two chains is repulsive in nature. The computed mean-squared displacement (MSD) clearly shows a scaling with time <Delta theta(2)(t)> similar to t(1/2), which is consistent with single-file diffusion (SFD). The time up to which the water molecules undergo SFD is shown to be the lifetime of the water molecules inside these chains. Simulations of "uncharged" water molecules inside the nanoring show the formation of several water chains and yield SFD. These observations conclusively prove that the diffusion is Fickian when there is a single chain of water and SFD is observed only when two or more chains are present.
Reprint Address:
Mukherjee, B, Indian Inst Sci, Dept Phys, Ctr Condensed Matter Theory, Bangalore 560012, Karnataka, India.
Research Institution addresses:
[Mukherjee, Biswaroop; Maiti, Prabal K.; Dasgupta, Chandan] Indian Inst Sci, Dept Phys, Ctr Condensed Matter Theory, Bangalore 560012, Karnataka, India; [Dasgupta, Chandan] Jawaharlal Nehru Ctr Adv Sci Res, Condensed Matter Theory Unit, Bangalore 560064, Karnataka, India
E-mail Address:
biswa@physics.iisc.ernet.in
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Times Cited:
0
Publisher:
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Subject Category:
Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
ISSN:
1936-0851
DOI:
10.1021/nn900858a
IDS Number:
556ZI
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