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Friday, April 1, 2011

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 AUG 2011
Number of Citing Articles: 6 new records this week (6 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
A review of reverse osmosis membrane materials for desalination-Development to date and future potential

Authors:
Lee, KP; Arnot, TC; Mattia, D

Author Full Names:
Lee, Kali Peng; Arnot, Tom C.; Mattia, Davide

Source:
JOURNAL OF MEMBRANE SCIENCE 370 (1-2): 1-22 MAR 15 2011

Language:
English

Document Type:
Review

Author Keywords:
Desalination; Reverse osmosis (RO); Membrane material; Membrane performance; Nano-materials

KeyWords Plus:
CARBON NANOTUBE MEMBRANES; FILM COMPOSITE MEMBRANE; POLYAMIDE MOLECULAR-STRUCTURE; ATOMIC-FORCE MICROSCOPY; CARBIDE-DERIVED CARBON; RIGID STAR AMPHIPHILES; NANOFILTRATION MEMBRANES; SEAWATER DESALINATION; INTERFACIAL POLYMERIZATION; ZEOLITE MEMBRANES

Abstract:
Reverse osmosis (RO) is currently the most important desalination technology and it is experiencing significant growth. The objective of this paper is to review the historical and current development of RO membrane materials which are the key determinants of separation performance and water productivity, and hence to define performance targets for those who are developing new RO membrane materials. The chemistry, synthesis mechanism(s) and desalination performance of various RO membranes are discussed from the point of view of membrane materials science. The review starts with the first generation of asymmetric polymeric membranes and finishes with current proposals for nano-structured membrane materials. The paper provides an overview of RO performance in relation to membrane materials and methods of synthesis.
To date polymeric membranes have dominated the RO desalination industry. From the late 1950s to the 1980s the research effort focussed on the search for optimum polymeric membrane materials. In subsequent decades the performance of RO membranes has been optimised via control of membrane formation reactions, and the use of poly-condensation catalysts and additives. The performance of state-of-the-art RO membranes has been highlighted. Nevertheless, the advances in membrane permselectivity in the past decade has been relatively slow, and membrane fouling remains a severe problem.
The emergence of nano-technology in membrane materials science could offer an attractive alternative to polymeric materials. Hence nano-structured membranes are discussed in this review including zeolite membranes, thin film nano-composite membranes, carbon nano-tube membranes, and biomimetic membranes. It is proposed that these novel materials represent the most likely opportunities for enhanced RO desalination performance in the future, but that a number of challenges remain with regard to their practical implementation. (C) 2010 Elsevier B.V. All rights reserved.

Reprint Address:
Mattia, D, Univ Bath, Dept Chem Engn, Bath BA2 7AY, Avon, England.

Research Institution addresses:
[Lee, Kali Peng; Arnot, Tom C.; Mattia, Davide] Univ Bath, Dept Chem Engn, Bath BA2 7AY, Avon, England

E-mail Address:
D.Mattia@bath.ac.uk

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Cited Reference Count:
209

Times Cited:
0

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

Subject Category:
Engineering, Chemical; Polymer Science

ISSN:
0376-7388

DOI:
10.1016/j.memsci.2010.12.036

IDS Number:
734RV

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Title:
Fluctuation Effects of the Electric Field Induced by Water on a Graphene Dot Band Gap

Authors:
Dalosto, SD; Tinte, S

Author Full Names:
Dalosto, Sergio D.; Tinte, Silvia

Source:
JOURNAL OF PHYSICAL CHEMISTRY C 115 (11): 4381-4386 MAR 24 2011

Language:
English

Document Type:
Article

KeyWords Plus:
NANORIBBONS; NANOTUBES; OXIDE

Abstract:
We investigate how a box of water molecules affects the HOMO LUMO gap of a rectangular graphene nanodot (GND) with two zigzag and two armchair edges, using a combination of first principles and molecular mechanics, and also classical molecular dynamics. A GND is solvated in a periodic box of water molecules, and the HOMO LUMO gap is computed for some snapshots taken from a molecular dynamics simulation. Although an isolated GND has a semiconductor state with degenerate alpha and beta gaps, we find that, in a solvated GND, that degeneracy broken and the gaps of both spins flavors oscillate following the time fluctuations in strength and direction of the electric field generated by the solvent at the edges. The average electric field generated by the water molecules causes an effect equivalent to applying a uniform electric field of 0.16 V/angstrom computed at the PBE level of theory. In particular, this field is not strong enough to change the GND semiconductor ground state to
a half-metallic one in nanodots with dimensions smaller than 2.5 nm, as those studied here. These results can be useful in the design of sensors based on graphene, indicating that important fluctuations in the energy gap can occur if water molecules are present.

Reprint Address:
Dalosto, SD, INTEC CONICET, Guemes 3450, RA-3000 Santa Fe, Argentina.

Research Institution addresses:
[Dalosto, Sergio D.] INTEC CONICET, RA-3000 Santa Fe, Argentina; Univ Nacl Litoral, RA-3000 Santa Fe, Argentina

E-mail Address:
dalosto@intec.unl.edu.ar

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Cited Reference Count:
44

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/jp109297p

IDS Number:
735GK

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Title:
Syntheses, structures, and photoluminescence of lanthanide coordination polymers with pyridine-2,3,5,6-tetracarboxylic acid

Authors:
Yang, AH; Gao, HL; Cui, JZ; Zhao, B

Author Full Names:
Yang, Ai-Hong; Gao, Hong-Ling; Cui, Jian-Zhong; Zhao, Bin

Source:
CRYSTENGCOMM 13 (6): 1870-1876 2011

Language:
English

Document Type:
Article

KeyWords Plus:
ORGANIC SUPRAMOLECULAR COMPLEX; CYCLIC WATER HEPTAMER; SOLID-STATE; PYRAZINE-2,3,5,6-TETRACARBOXYLIC ACID; CRYSTAL-STRUCTURE; (H2O)(10) CLUSTER; 1,2,4,5-BENZENETETRACARBOXYLIC ACID; MOLECULAR RECOGNITION; FRAMEWORK STRUCTURES; ICE

Abstract:
Six lanthanide(III) coordination polymers with the formulae {[Ln(Hpdtc)(H2O)(3)]center dot H2O}(n) [Ln = La (1), Ce (2), Pr (3)], {[Ln(Hpdtc)(H2O)(2)]center dot 2H(2)O}(n) [Ln = Eu (4), Tb (5)] and {SmK(pdtc)(H2O)(4)} n (6) (H(4)pdtc = pyridine-2,3,5,6-tetracarboxylic acid) have been synthesized by reacting the corresponding rare earth salts or oxides with H(4)pdtc under hydrothermal conditions. In the three kinds of structure, H(4)pdtc displays three different coordination modes. H(4)pdtc is an elegant ligand with rich coordination sites and low symmetry, but has seldom been used to synthesize complexes. 1-6 are the first examples from lanthanide ions and H(4)pdtc. Furthermore, the novel wave-like T3(2)4(2)6(2) water tape with (H2O)(4) as the substructure is present in complex 6. The two complexes of Eu(III) and Tb(III) exhibit the corresponding characteristic luminescence.

Reprint Address:
Cui, JZ, Tianjin Univ, Dept Chem, Tianjin 300072, Peoples R China.

Research Institution addresses:
[Yang, Ai-Hong; Gao, Hong-Ling; Cui, Jian-Zhong] Tianjin Univ, Dept Chem, Tianjin 300072, Peoples R China; [Zhao, Bin] Nankai Univ, Dept Chem, Tianjin 300071, Peoples R China

E-mail Address:
cuijianzhong@tju.edu.cn

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Cited Reference Count:
73

Times Cited:
0

Publisher:
ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND

Subject Category:
Chemistry, Multidisciplinary; Crystallography

ISSN:
1466-8033

DOI:
10.1039/c0ce00397b

IDS Number:
729BV

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Title:
Raman spectroscopy of iodine molecules trapped in zeolite crystals

Authors:
Guo, WH; Wang, DD; Hu, JM; Tang, ZK; Du, SW

Author Full Names:
Guo, Wenhao; Wang, Dingdi; Hu, Juanmei; Tang, Z. K.; Du, Shengwang

Source:
APPLIED PHYSICS LETTERS 98 (4): Art. No. 043105 JAN 24 2011

Language:
English

Document Type:
Article

KeyWords Plus:
CARBON NANOTUBE; HYPERFINE INTERACTIONS; CHANNELS; STATE; NM

Abstract:
We study the Raman spectroscopy of neutral iodine molecules confined in the channels of zeolite AlPO4-5 (AFI) and AlPO4-11 (AEL) crystals, which shows that the molecular vibration states are significantly modified by the confinements from the nanosize channels. An iodine molecule trapped in the AEL crystal has an effective internuclear potential close to an ideal harmonic oscillator, while that in the AFI crystal behaves similarly to that in free space. The results are further confirmed by measuring the temperature dependence of Raman spectral width. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3549194]

Reprint Address:
Du, SW, Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China.

Research Institution addresses:
[Guo, Wenhao; Wang, Dingdi; Hu, Juanmei; Tang, Z. K.; Du, Shengwang] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China

E-mail Address:
phzktang@ust.hk; dusw@ust.hk

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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:
10.1063/1.3549194

IDS Number:
712OR

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Title:
Control of Unidirectional Transport of Single-File Water Molecules through Carbon Nanotubes in an Electric Field

Authors:
Su, JY; Guo, HX

Author Full Names:
Su, Jiaye; Guo, Hongxia

Source:
ACS NANO 5 (1): 351-359 JAN 2010

Language:
English

Document Type:
Article

Author Keywords:
water molecule; transport; carbon nanotube; electric field; molecular dynamics simulation

KeyWords Plus:
NONPOLAR CAVITIES; DRUG-DELIVERY; ICE NANOTUBES; CHANNEL; MEMBRANES; COMPOSITES; MECHANISM; CLUSTERS; PROTEIN; DESALINATION

Abstract:
The transport of water molecules through nanopores is not only crucial to biological activities but also useful for designing novel nanofluidic devices. Despite considerable effort and progress that has been made, a controllable and unidirectional water flow is still difficult to achieve and the underlying mechanism is far from being understood. In this paper, using molecular dynamics simulations, we systematically investigate the effects of an external electric field on the transport of single-file water molecules through a carbon nanotube (CNT). We find that the orientation of water molecules inside the CNT can be well-tuned by the electric field and is strongly coupled to the water flux. This orientation induced water flux is energetically due to the asymmetrical water water interaction along the CNT ills. The wavelike water density profiles are disturbed under strong field strengths. The frequency of flipping for the water dipoles will decrease as the field strength is in
creased, and the flipping events vanish completely for the relatively large field strengths. Most importantly, a critical field strength E, related to the water flux is found. The water flux is increased as E is increased for E <= E-o while it is almost unchanged for E > E-c. Thus, the electric field offers a level of governing for unidirectional water flow, which may have some biological applications and provides a route for designing efficient nanopumps.

Reprint Address:
Guo, HX, Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Joint Lab Polymer Sci & Mat,State Key Lab Polymer, Beijing 100190, Peoples R China.

Research Institution addresses:
[Su, Jiaye; Guo, Hongxia] Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, Joint Lab Polymer Sci & Mat,State Key Lab Polymer, Beijing 100190, Peoples R China

E-mail Address:
hxguo@iccas.ac.cn

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75

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/nn1014616

IDS Number:
710CA

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Title:
Helical Encapsulation of Graphene Nanoribbon into Carbon Nanotube

Authors:
Jiang, YY; Li, H; Li, YF; Yu, HQ; Liew, KM; He, YZ; Liu, XF

Author Full Names:
Jiang, Yanyan; Li, Hui; Li, Yunfang; Yu, Haiqing; Liew, Kim M.; He, Yezeng; Liu, Xiangfa

Source:
ACS NANO 5 (3): 2126-2133 MAR 2011

Language:
English

Document Type:
Article

Author Keywords:
molecular dynamics simulation; graphene nanoribbon; carbon nanotube; helical configuration; the pi-pi stacking interaction; nanoscale carriers

KeyWords Plus:
FORCE-FIELD; WATER; DYNAMICS; OXIDE; TRANSPORTATION; ENERGETICS; BEHAVIOR; CHANNEL; COMPASS; ESTERS

Abstract:
Molecular dynamics (MD) simulations were performed to study interaction between the graphene nanoribbon (GNR) and single-wall carbon nanotube (SWCNT). The GNR enters the SWCNT spontaneously to display a helical configuration which is quite similar to the chloroplast in the spirogyra cell. This unique phenomenon results from the combined action of the van der Waals potential well and the pi-pi stacking interaction. The size of SWCNT and GNR should satisfy some certain conditions in the helical encapsulation process. A DNA-like double helix would be formed inside the SWCNT with the encapsulation of two GNRs. A water cluster enclosed in the SWCNT has great effect on the formation of the GNR helix in the tube. Furthermore, we also studied the possibility that the spontaneous encapsulation of GNR is used for substance delivery. The expected outcome of these properties is to provide novel strategies to design nanoscale carriers and reaction devices.

Reprint Address:
Li, H, Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China.

Research Institution addresses:
[Jiang, Yanyan; Li, Hui; Li, Yunfang; Yu, Haiqing; He, Yezeng; Liu, Xiangfa] Shandong Univ, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jinan 250061, Peoples R China; [Liew, Kim M.] City Univ Hong Kong, Dept Bldg & Construct, Kowloon, Hong Kong, Peoples R China

E-mail Address:
lihuilmy@hotmail.com

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Cited Reference Count:
47

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/nn103317u

IDS Number:
737LP

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Friday, March 25, 2011

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 AUG 2011
Number of Citing Articles: 7 new records this week (7 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Frictionless Sliding of Single-Stranded DNA in a Carbon Nanotube Pore Observed by Single Molecule Force Spectroscopy

Authors:
Lulevich, V; Kim, S; Grigoropoulos, CP; Noy, A

Author Full Names:
Lulevich, Valentin; Kim, Sangil; Grigoropoulos, Costas P.; Noy, Aleksandr

Source:
NANO LETTERS 11 (3): 1171-1176 MAR 2011

Language:
English

Document Type:
Article

Author Keywords:
Single molecule force spectroscopy; DNA; carbon nanotubes; CNT membrane; nanofluidics; molecular friction

KeyWords Plus:
MICROSCOPY; TRANSPORT; INSERTION; HYBRIDS

Abstract:
Smooth inner pores of carbon nanotubes (CNT) provide a fascinating model for studying biological transport. We used an atomic force microscope to pull a single-stranded DNA oligomer from a carbon nanotube pore. DNA extraction from CNT pores occurs at a nearly constant force, which is drastically different from the elastic profile commonly observed during polymer stretching with atomic force microscopy. We show that a combination of the frictionless nanotube pore walls and an unfavorable DNA solvation energy produces this constant force profiles.

Reprint Address:
Noy, A, UC Merced, Sch Nat Sci, Merced, CA 95343 USA.

Research Institution addresses:
[Noy, Aleksandr] UC Merced, Sch Nat Sci, Merced, CA 95343 USA; [Lulevich, Valentin; Grigoropoulos, Costas P.] Univ Calif Berkeley, Dept Mech Engn, Berkeley, CA 94720 USA; [Kim, Sangil] Porifera Inc, Hayward, CA USA; [Lulevich, Valentin; Kim, Sangil; Noy, Aleksandr] Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA USA

E-mail Address:
anoy@ucmerced.edu

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Cited Reference Count:
28

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:
1530-6984

DOI:
10.1021/nl104116s

IDS Number:
730UY

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

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Title:
Growth stimulation of gram (Cicer arietinum) plant by water soluble carbon nanotubes

Authors:
Tripathi, S; Sonkar, SK; Sarkar, S

Author Full Names:
Tripathi, Shweta; Sonkar, Sumit Kumar; Sarkar, Sabyasachi

Source:
NANOSCALE 3 (3): 1176-1181 2011

Language:
English

Document Type:
Article

KeyWords Plus:
CELL-MEMBRANES; TRANSLOCATION; TRANSPORTERS; ROOTS; MICE

Abstract:
Water soluble carbon nanotubes (wsCNTs) show enhancement of the growth rate of common gram (Cicer arietinum) plants. Treating plants with up to 6.0 mu g mL(-1) of wsCNT shows an increased growth rate in every part of the plant including the roots, shoots and also in branching. The noticeable difference between the wsCNT treated and controlled gram is the water uptake; in the former it is dramatically enhanced, suggesting better water absorption and retention related to enhanced growth. This work shows that unlike CNTs, wsCNTs are non-toxic to plant cells that conserve water transport in plants.

Reprint Address:
Sarkar, S, Indian Inst Technol, Dept Chem, Kanpur 208016, Uttar Pradesh, India.

Research Institution addresses:
[Tripathi, Shweta; Sonkar, Sumit Kumar; Sarkar, Sabyasachi] Indian Inst Technol, Dept Chem, Kanpur 208016, Uttar Pradesh, India

E-mail Address:
abya@iitk.ac.in

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28

Times Cited:
0

Publisher:
ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND

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

ISSN:
2040-3364

DOI:
10.1039/c0nr00722f

IDS Number:
732VR

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

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Title:
Design of a one-way nanovalve based on carbon nanotube junction and C-60

Authors:
Chen, HY; Liu, ZF; Gong, XG; Sun, DY

Author Full Names:
Chen, H. Y.; Liu, Z. F.; Gong, X. G.; Sun, D. Y.

Source:
MICROFLUIDICS AND NANOFLUIDICS 10 (4): 927-933 APR 2011

Language:
English

Document Type:
Article

Author Keywords:
Molecular dynamics simulation; Nanofluid devices; Carbon nanotube junctions

KeyWords Plus:
MOLECULAR-DYNAMICS SIMULATIONS; WATER CHANNEL; FLUID-FLOW; MOTOR; PUMP

Abstract:
We report the conceptual construction of a one-way nanovalve based on a carbon nanotube intramolecular junction and a C-60. Using molecular dynamics simulations, we demonstrate the flow behavior of helium through the nanovalve as controlled by the pressure balance around C-60. The van der Waals interaction between C-60 and carbon nanotube keeps C-60 close to the junction, while the pressure balance around C-60 can juggle it between two adsorption sites, which in turn closes or opens the nanovalve.

Reprint Address:
Sun, DY, E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China.

Research Institution addresses:
[Chen, H. Y.; Sun, D. Y.] E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China; [Liu, Z. F.] Chinese Univ Hong Kong, Dept Chem, Shatin, Hong Kong, Peoples R China; [Liu, Z. F.] Chinese Univ Hong Kong, Ctr Sci Modeling & Computat, Shatin, Hong Kong, Peoples R China; [Gong, X. G.] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China

E-mail Address:
dysun@phy.ecnu.edu.cn

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Cited Reference Count:
39

Times Cited:
0

Publisher:
SPRINGER HEIDELBERG; TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY

Subject Category:
Nanoscience & Nanotechnology; Instruments & Instrumentation; Physics, Fluids & Plasmas

ISSN:
1613-4982

DOI:
10.1007/s10404-010-0719-8

IDS Number:
733HU

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

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Title:
Functional Relationships between Agonist Binding Sites and Coupling Regions of Homomeric Cys-Loop Receptors

Authors:
Andersen, N; Corradi, J; Bartos, M; Sine, SM; Bouzat, C

Author Full Names:
Andersen, Natalia; Corradi, Jeremias; Bartos, Mariana; Sine, Steven M.; Bouzat, Cecilia

Source:
JOURNAL OF NEUROSCIENCE 31 (10): 3662-3669 MAR 9 2011

Language:
English

Document Type:
Article

KeyWords Plus:
NICOTINIC ACETYLCHOLINE-RECEPTOR; GABA(A) RECEPTOR; LIGAND-BINDING; ION-CHANNEL; M2 DOMAIN; RESOLUTION; RESIDUES; DYNAMICS; PRE-M1; WATER

Abstract:
Each subunit in a homopentameric Cys-loop receptor contains a specialized coupling region positioned between the agonist binding domain and the ion conductive channel. To determine the contribution of each coupling region to the stability of the open channel, we constructed a receptor subunit (alpha 7-5-HT3A) with both a disabled coupling region and a reporter mutation that alters unitary conductance, and coexpressed normal and mutant subunits. The resulting receptors show single-channel current amplitudes that are quantized according to the number of reporter mutations per receptor, allowing correlation of the number of intact coupling regions with mean open time. We find that each coupling region contributes an equal increment to the stability of the open channel. However, by altering the numbers and locations of active coupling regions and binding sites, we find that a coupling region in a subunit flanked by inactive binding sites can still stabilize the open channel. We a
lso determine minimal requirements for channel opening regardless of stability and find that channel opening can occur in a receptor with one active coupling region flanked by functional binding sites or with one active binding site flanked by functional coupling regions. The overall findings show that, whereas the agonist binding sites contribute interdependently and asymmetrically to open-channel stability, the coupling regions contribute independently and symmetrically.

Reprint Address:
Sine, SM, Mayo Clin, Coll Med, Receptor Biol Lab, Dept Physiol, Rochester, MN 55905 USA.

Research Institution addresses:
[Sine, Steven M.] Mayo Clin, Coll Med, Receptor Biol Lab, Dept Physiol, Rochester, MN 55905 USA; [Sine, Steven M.] Mayo Clin, Coll Med, Receptor Biol Lab, Dept Biomed Engn, Rochester, MN 55905 USA; [Sine, Steven M.] Mayo Clin, Coll Med, Receptor Biol Lab, Dept Neurol, Rochester, MN 55905 USA; [Andersen, Natalia; Corradi, Jeremias; Bartos, Mariana; Bouzat, Cecilia] Univ Nacl Sur, Inst Invest Bioquim, Consejo Nacl Invest Cient & Tecn, RA-8000 Bahia Blanca, Buenos Aires, Argentina

E-mail Address:
sine@mayo.edu; inbouzat@criba.edu.ar

Cited References:
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Cited Reference Count:
30

Times Cited:
0

Publisher:
SOC NEUROSCIENCE; 11 DUPONT CIRCLE, NW, STE 500, WASHINGTON, DC 20036 USA

Subject Category:
Neurosciences

ISSN:
0270-6474

DOI:
10.1523/JNEUROSCI.5940-10.2011

IDS Number:
732CJ

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

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Title:
C-60-polysulfone nanocomposite membranes: Entropic and enthalpic determinants of C-60 aggregation and its effects on membrane properties

Authors:
Taurozzi, JS; Crock, CA; Tarabara, VV

Author Full Names:
Taurozzi, Julian S.; Crock, Christopher A.; Tarabara, Volodymyr V.

Source:
DESALINATION 269 (1-3): 111-119 MAR 15 2011

Language:
English

Document Type:
Article

Author Keywords:
Polymer nanocomposite; C-60 fullerene; Phase inversion; Polysulfone; Enthalpic and entropic interactions

KeyWords Plus:
AEROSIL COMPOSITE MEMBRANES; CELLULOSE-ACETATE MEMBRANES; CARBON NANOTUBES; PHASE-INVERSION; ESTROGENIC COMPOUNDS; POLYMER COMPOSITES; FUEL-CELLS; SEPARATION; WATER; NANOPARTICLES

Abstract:
The study focuses on the effects of C-60 filler on the phase inversion process and related changes in the morphology and separation properties of cast C-60-polysulfone nanocomposite membranes. The effects of C-60 on the rejection and permeability of the cast membranes are correlated to rheological and demixing properties of the corresponding casting mixtures. The observed differences between C-60-free and nanocomposite membranes are interpreted as resulting from enthalpic and entropic C-60-polysulfone interactions that drive and are mediated by the aggregation of C-60. Only 30 nm and smaller C-60 aggregates are observed in membranes with the smallest (1% C-60/polysulfone by mass) C-60 loading. In contrast, only aggregates larger than 30 nm are found in composites with 5% and 10% C-60 loadings. A correlation between the demixing rate and permeability and a counter-correlation between permeability and rejection are observed for nanocomposite membranes for the entire C-60 loadin
gs range studied. The observed accumulation of the filler at the surface of internal membrane pores is attributed to the expulsion of C60 aggregates to the free surface for an entropic gain. The findings have implications for the design of polymer nanocomposite membranes as well as for the lifecycle analysis of nanomaterial-enabled products. (C) 2010 Elsevier B.V. All rights reserved.

Reprint Address:
Tarabara, VV, Michigan State Univ, Dept Civil & Environm Engn, E Lansing, MI 48824 USA.

Research Institution addresses:
[Taurozzi, Julian S.; Crock, Christopher A.; Tarabara, Volodymyr V.] Michigan State Univ, Dept Civil & Environm Engn, E Lansing, MI 48824 USA

E-mail Address:
tarabara@msu.edu

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Cited Reference Count:
54

Times Cited:
0

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

Subject Category:
Engineering, Chemical; Water Resources

ISSN:
0011-9164

DOI:
10.1016/j.desal.2010.10.049

IDS Number:
730UO

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

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Title:
Wetting of Liquid Iron in Carbon Nanotubes and on Graphene Sheets: A Molecular Dynamics Study

Authors:
Gao, YF; Yang, Y; Sun, DY

Author Full Names:
Gao Yu-Feng; Yang Yang; Sun De-Yan

Source:
CHINESE PHYSICS LETTERS 28 (3): Art. No. 036102 MAR 2011

Language:
English

Document Type:
Article

KeyWords Plus:
CONTACT-ANGLE; LINE TENSION; VAPOR INTERFACE; ENERGY; CAPILLARITY; SIMULATION; POTENTIALS; DEPENDENCE; NANOWIRES; SURFACES

Abstract:
Using molecular dynamics simulations, we study the wetting of liquid iron in a carbon nanotube and on a graphene sheet. It is found that the contact angle of a droplet in a carbon nanotube increases linearly with the increase of wall curvature but is independent of the length of the filled liquid. The contact angle for a droplet on a graphene sheet decreases with the increasing droplet size. The line tension of a droplet on a graphene sheet is also obtained. Detailed studies show that liquid iron near the carbon walls exhibits the ordering tendencies in both the normal and tangential directions.

Reprint Address:
Gao, YF, E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China.

Research Institution addresses:
[Gao Yu-Feng; Yang Yang; Sun De-Yan] E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China

E-mail Address:
dysun@phy.ecnu.edu.cn

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Times Cited:
0

Publisher:
IOP PUBLISHING LTD; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND

Subject Category:
Physics, Multidisciplinary

ISSN:
0256-307X

DOI:
10.1088/0256-307X/28/3/036102

IDS Number:
731PF

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

*Record 7 of 7.
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Title:
Separation and Diameter-Sorting of Empty (End-Capped) and Water-Filled (Open) Carbon Nanotubes by Density Gradient Ultracentrifugation

Authors:
Cambre, S; Wenseleers, W

Author Full Names:
Cambre, Sofie; Wenseleers, Wim

Source:
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 50 (12): 2764-2768 2011

Language:
English

Document Type:
Article

Author Keywords:
carbon nanotubes; chirality; luminescence; surfactants; ultracentrifugation

KeyWords Plus:
DIFFERENTIATION; SPECTROSCOPY; SURFACTANTS

Reprint Address:
Wenseleers, W, Univ Antwerp, Dept Phys, Univ Pl 1, B-2610 Antwerp, Belgium.

Research Institution addresses:
[Cambre, Sofie; Wenseleers, Wim] Univ Antwerp, Dept Phys, B-2610 Antwerp, Belgium

E-mail Address:
wim.wenseleers@ua.ac.be

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31

Times Cited:
0

Publisher:
WILEY-BLACKWELL; COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA

Subject Category:
Chemistry, Multidisciplinary

ISSN:
1433-7851

DOI:
10.1002/anie.201007324

IDS Number:
732GQ

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Friday, March 18, 2011

ISI Web of Knowledge Alert - Hummer, G

ISI Web of Knowledge Citation Alert

Title:
Forced vibration of an embedded single-walled carbon nanotube traversed by a moving load using nonlocal Timoshenko beam theory

Authors:
Simsek, M

Author Full Names:
Simsek, Mesut

Source:
STEEL AND COMPOSITE STRUCTURES 11 (1): 59-76 FEB 2011

Language:
English

Document Type:
Article

Author Keywords:
vibration; nonlocal Timoshenko beam theory; carbon nanotubes; moving loads

KeyWords Plus:
SHEAR DEFORMATION-THEORY; PRESTRESSED DAMPED BEAM; SMALL LENGTH SCALE; HARMONIC LOAD; WAVE-PROPAGATION; CONTINUUM-MECHANICS; DYNAMIC-ANALYSIS; ELASTICITY THEORY; MICROTUBULES; MODELS

Abstract:
Dynamic analysis of an embedded single-walled carbon nanotube (SWCNT) traversed by a moving nanoparticle, which is modeled as a moving load, is investigated in this study based on the nonlocal Timoshenko beam theory, including transverse shear deformation and rotary inertia. The governing equations and boundary conditions are derived by using the principle of virtual displacement. The Galerkin method and the direct integration method of Newmark are employed to find the dynamic response of the SWCNT. A detailed parametric study is conducted to study the influences of the nonlocal parameter, aspect ratio of the SWCNT, elastic medium constant and the moving load velocity on the dynamic responses of SWCNT. For comparison purpose, free vibration frequencies of the SWCNT are obtained and compared with a previously published study. Good agreement is observed. The results show that the above mentioned effects play an important role on the dynamic behaviour of the SWCNT.

Reprint Address:
Simsek, M, Yildiz Tech Univ, Dept Civil Engn, Davutpasa Campus, TR-34210 Esenler, Turkey.

Research Institution addresses:
Yildiz Tech Univ, Dept Civil Engn, TR-34210 Esenler, Turkey

E-mail Address:
mesutsimsek@gmail.com

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82

Times Cited:
0

Publisher:
TECHNO-PRESS; PO BOX 33, YUSEONG, DAEJEON 305-600, SOUTH KOREA

Subject Category:
Construction & Building Technology; Engineering, Civil; Materials Science, Composites

ISSN:
1229-9367

IDS Number:
729MH

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

Title:
Transition from one-dimensional water to ferroelectric ice within a supramolecular architecture

Authors:
Zhao, HX; Kong, XJ; Li, H; Jin, YC; Long, LS; Zeng, XC; Huang, RB; Zheng, LS

Author Full Names:
Zhao, Hai-Xia; Kong, Xiang-Jian; Li, Hui; Jin, Yi-Chang; Long, La-Sheng; Zeng, Xiao Cheng; Huang, Rong-Bin; Zheng, Lan-Sun

Source:
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 108 (9): 3481-3486 MAR 1 2011

Language:
English

Document Type:
Article

Author Keywords:
ab initio molecular dynamics; phase transition; supramolecular nanochannel

KeyWords Plus:
WALLED CARBON NANOTUBES; NEUTRON-DIFFRACTION; PHASE-TRANSITION; DENSITY; DYNAMICS; CRYSTAL; NANOSCALE; EXISTENCE

Abstract:
Ferroelectric materials are characterized by spontaneous electric polarization that can be reversed by inverting an external electric field. Owing to their unique properties, ferroelectric materials have found broad applications in microelectronics, computers, and transducers. Water molecules are dipolar and thus ferroelectric alignment of water molecules is conceivable when water freezes into special forms of ice. Although the ferroelectric ice XI has been proposed to exist on Uranus, Neptune, or Pluto, evidence of a fully proton-ordered ferroelectric ice is still elusive. To date, existence of ferroelectric ice with partial ferroelectric alignment has been demonstrated only in thin films of ice grown on platinum surfaces or within microdomains of alkali-hydroxide doped ice I. Here we report a unique structure of quasi-one-dimensional (H2O)(12n) wire confined to a 3D supramolecular architecture of [(Cu2CuII)-Cu-I(CDTA)(4,4'-bpy)(2)](n) H(4)CDTA, trans-1,2-diaminocyclohexane-
N,N,N',N'-tetraacetic acid; 4,4'-bpy, 4,4'-bipyridine). In stark contrast to the bulk, this 1D water wire not only exhibits enormous dielectric anomalies at approximately 175 and 277 K, respectively, but also undergoes a spontaneous transition between "1D liquid" and "1D ferroelectric ice" at approximately 277 K. Hitherto unrevealed properties of the 1D water wire will be valuable to the understanding of anomalous properties of water and synthesis of novel ferroelectric materials.

Reprint Address:
Long, LS, Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China.

Research Institution addresses:
[Zhao, Hai-Xia; Kong, Xiang-Jian; Jin, Yi-Chang; Long, La-Sheng; Huang, Rong-Bin; Zheng, Lan-Sun] Xiamen Univ, State Key Lab Phys Chem Solid Surface, Xiamen 361005, Peoples R China; [Zhao, Hai-Xia; Kong, Xiang-Jian; Jin, Yi-Chang; Long, La-Sheng; Huang, Rong-Bin; Zheng, Lan-Sun] Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China; [Li, Hui; Zeng, Xiao Cheng] Univ Nebraska, Dept Chem, Lincoln, NE 68588 USA

E-mail Address:
lslong@xmu.edu.cn; xzeng1@unl.edu

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Cited Reference Count:
47

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.1010310108

IDS Number:
728AD

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

Title:
Vibrating carbon nanotubes as water pumps

Authors:
Qiu, H; Shen, R; Guo, WL

Author Full Names:
Qiu, Hu; Shen, Rong; Guo, Wanlin

Source:
NANO RESEARCH 4 (3): 284-289 MAR 2011

Language:
English

Document Type:
Article

Author Keywords:
Nanopump; carbon nanotube; nanofluidics; centrifugal forces; water dynamics

KeyWords Plus:
MOLECULAR-DYNAMICS; TRANSPORT; PERMEATION; DESALINATION; MEMBRANES; CHANNEL

Abstract:
Nanopumps conducting fluids directionally through nanopores and nanochannels have attracted considerable interest for their potential applications in nanofiltration, water purification, and hydroelectric power generation. Here, we demonstrate by molecular dynamics simulations that an excited vibrating carbon nanotube (CNT) cantilever can act as an efficient and simple nanopump. Water molecules inside the vibrating cantilever are driven by centrifugal forces and can undergo a continuous flow from the fixed to free ends of the CNT. Further extensive simulations show that the pumping function holds good not only for a single-file water chain in a narrow (6,6) CNT, but also for bulk-like water columns inside wider CNTs, and that the water flux increases monotonically with increasing diameter of the nanotube.

Reprint Address:
Guo, WL, Nanjing Univ Aeronaut & Astronaut, Inst Nano Sci, Nanjing 210016, Peoples R China.

Research Institution addresses:
[Qiu, Hu; Shen, Rong; Guo, Wanlin] Nanjing Univ Aeronaut & Astronaut, Inst Nano Sci, Nanjing 210016, Peoples R China

E-mail Address:
wlguo@nuaa.edu.cn

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Cited Reference Count:
34

Times Cited:
0

Publisher:
TSINGHUA UNIV PRESS; TSINGHUA UNIV, RM A703, XUEYAN BLDG, BEIJING, 10084, PEOPLES R CHINA

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

ISSN:
1998-0124

DOI:
10.1007/s12274-010-0080-y

IDS Number:
729TR

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

Title:
Density Functional Theory Study on the Water Clusters on Graphene Chip

Authors:
Abe, S; Nagoya, Y; Watari, F; Tachikawa, H

Author Full Names:
Abe, Shigeaki; Nagoya, Yoshinori; Watari, Fumio; Tachikawa, Hiroto

Source:
JAPANESE JOURNAL OF APPLIED PHYSICS 50 (1): Art. No. 01BJ02 Part 3 Sp. Iss. SI JAN 2011

Language:
English

Document Type:
Article

KeyWords Plus:
INITIO MOLECULAR-DYNAMICS; CARBON NANOTUBES; DIFFUSION DYNAMICS; AMORPHOUS-CARBON; THYMINE DIMER; SIMULATION; SURFACE; ION; MD

Abstract:
The structures and electronic states of graphene-water interaction systems have been investigated by means of density functional theory (DFT) method to elucidate the effects of water clusters on the electronic states of graphene chip. Solvation caused by five to eight water molecules (n = 5-8) was examined as the interaction systems. A graphene chip composed of 14 benzene rings was used as a model of finite-sized graphene (C42H16). The water clusters interact with the graphene chip with hydrogen bonds. The band gap of graphene was slightly red-shifted by the solvation and the first excitation energy was saturated around n = 5. The electronic states of graphene-water systems were discussed on the basis of theoretical results. (c) 2011 The Japan Society of Applied Physics

Reprint Address:
Abe, S, Hokkaido Univ, Grad Sch Dent Med, Dept Biomed Dent Med & Engn, Sapporo, Hokkaido 0608586, Japan.

Research Institution addresses:
[Abe, Shigeaki; Watari, Fumio] Hokkaido Univ, Grad Sch Dent Med, Dept Biomed Dent Med & Engn, Sapporo, Hokkaido 0608586, Japan; [Nagoya, Yoshinori; Tachikawa, Hiroto] Hokkaido Univ, Grad Sch Engn, Div Mat Chem, Sapporo, Hokkaido 0608628, Japan

E-mail Address:
sabe@den.hokudai.ac.jp

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Cited Reference Count:
19

Times Cited:
0

Publisher:
JAPAN SOC APPLIED PHYSICS; KUDAN-KITA BUILDING 5TH FLOOR, 1-12-3 KUDAN-KITA, CHIYODA-KU, TOKYO, 102-0073, JAPAN

Subject Category:
Physics, Applied

ISSN:
0021-4922

DOI:
10.1143/JJAP.50.01BJ02

IDS Number:
723RG

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

Title:
Water and ion transport through functionalised carbon nanotubes: implications for desalination technology

Authors:
Corry, B

Author Full Names:
Corry, Ben

Source:
ENERGY & ENVIRONMENTAL SCIENCE 4 (3): 751-759 MAR 2011

Language:
English

Document Type:
Article

KeyWords Plus:
MOLECULAR-DYNAMICS; MECHANOSENSITIVE CHANNEL; ACETYLCHOLINE-RECEPTOR; MEMBRANES; PERMEATION; PORES; AQUAPORIN-1; SELECTIVITY; CONDUCTION; NANOPORES

Abstract:
The use of semipermeable membranes containing carbon nanotubes (CNTs) that form continuous pores has been suggested as a way to reduce the cost of desalination via reverse osmosis. Example membranes containing aligned CNTs have been fabricated, but obtaining only the very narrow pores that are able to block the passage of ions while allowing a rapid flow of water remains a challenge and previous computational studies have focused on idealised tubes. Here molecular dynamics simulations are used to examine water and ion transport through functionalised CNTs with the aim of investigating whether such chemical modification allows the performance of CNT based membranes to be improved, or for larger diameter pores to be used. A range of different charged and polar functional groups were added to a 1.1 nm diameter (8,8) CNT that was previously found to be only moderately effective at rejecting ions. These CNTs were incorporated into membranes and simulations were conducted with a hy
drostatic pressure difference to determine the ion rejection and flux of water passing through each as well as the energy barriers presented to ions and water molecules. The results show that the addition of charges at the entrance of the pore can help to prevent the passage of ions, however, any functionalisation also reduces the flow of water through the membrane due to increased electrostatic interactions between the water molecules and the CNT. Assuming pore densities that have previously been achieved, the performance of these membranes in the simulations is still many times better than existing technology and thus the inclusion of functionalised CNTs in desalination membranes may prove to be useful in achieving salt rejection and rapid water flow.

Reprint Address:
Corry, B, Univ Western Australia, Sch Biomed Biomol & Chem Sci, Perth, WA 6009, Australia.

Research Institution addresses:
Univ Western Australia, Sch Biomed Biomol & Chem Sci, Perth, WA 6009, Australia

E-mail Address:
ben.corry@uwa.edu.au

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Cited Reference Count:
35

Times Cited:
0

Publisher:
ROYAL SOC CHEMISTRY; THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND

Subject Category:
Chemistry, Multidisciplinary; Energy & Fuels; Engineering, Chemical; Environmental Sciences

ISSN:
1754-5692

DOI:
10.1039/c0ee00481b

IDS Number:
729CE

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

Title:
Behavior of Carbon Nanotube Membranes as Channels of Salt and Water in Forward Osmosis Process

Authors:
Jia, YX; Li, Y; Hu, YD

Author Full Names:
Jia Yu-Xiang; Li Yan; Hu Yang-Dong

Source:
ACTA PHYSICO-CHIMICA SINICA 27 (1): 228-232 JAN 2011

Language:
Chinese

Document Type:
Article

Author Keywords:
Forward osmosis; Membrane separation; Desalination; Carbon nanotube; Molecular dynamics simulation

KeyWords Plus:
HOLLOW-FIBER MEMBRANES; MOLECULAR-DYNAMICS; TRANSPORT; DESALINATION; CONDUCTION; MODELS

Abstract:
We investigated the influence of carbon nanotube (CNT) size using CNTs including CNT(6,6), CNT(7,7), CNT(8,8), CNT(9,9), CNT(10,10), and CNT(11,11), and the influence of draw solution concentrations, such as 2.5, 3.75, and 5.0 mol . L-1, on the permeation behaviors of salt and water molecules through the biomimetically manufactured forward osmosis (FO) membranes. Nanosecond-scale molecular dynamic simulations were carried out to obtain the relevant information, including the distributions of the water molecules, water flux, and salt permeation within the different CNT membranes. Simulation results show that the FO membrane incorporating CNT(8,8) can achieve the highest water flux and also the lowest salt permeation.

Reprint Address:
Jia, YX, Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Shandong Prov, Peoples R China.

Research Institution addresses:
[Jia Yu-Xiang; Li Yan; Hu Yang-Dong] Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Shandong Prov, Peoples R China

E-mail Address:
jiayx76@yahoo.com.cn

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Cited Reference Count:
25

Times Cited:
0

Publisher:
PEKING UNIV PRESS; PEKING UNIV, CHEMISTRY BUILDING, BEIJING 100871, PEOPLES R CHINA

Subject Category:
Chemistry, Physical

ISSN:
1000-6818

IDS Number:
700YN

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ISI Web of Knowledge Alert - Hummer, G

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ISI Web of Knowledge Alert - Hummer, G

Friday, March 18, 2011

ISI Web of Knowledge Alert - Hummer, G

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