Cited Article: Hummer, G. Water conduction through the hydrophobic channel of a carbon nanotube
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Number of Citing Articles: 2 new records this week (2 in this e-mail)
Organization ID: 3b97d1bbc1878baed0ab183d8b03130b
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Title:
Nanofiltration of Electrolyte Solutions by Sub-2nm Carbon Nanotube Membranes
Authors:
Fornasiero, F; Park, HG; Holt, JK; Stadermann, M; Kim, S; In, JB; Grigoropoulos, CP; Noy, A; Bakajin, O
Author Full Names:
Fornasiero, Francesco; Park, Hyung Gyu; Holt, Jason K.; Stadermann, Michael; Kim, Sangil; In, Jung Bin; Grigoropoulos, Costas P.; Noy, Aleksandr; Bakajin, Olgica
Source:
NSTI NANOTECH 2008, VOL 2, TECHNICAL PROCEEDINGS : 106-109 2008
Language:
English
Document Type:
Proceedings Paper
Author Keywords:
carbon nanotube; membrane; ion exclusion; fast flow
KeyWords Plus:
WATER; TRANSPORT; GROWTH
Abstract:
Both MD simulations and experimental studies have shown that liquid and gas flow through carbon nanotubes with nanometer size diameter is exceptionally fast. For applications in separation technology, selectivity is required together with fast flow. In this work, we use pressure-driven filtration experiments to study ion exclusion in silicon nitride/sub-2-nm CNT composite membranes as a function of solution ionic strength, pH, and ion valence. We show that carbon nanotube membranes exhibit significant ion exclusion at low salt concentration. Our results support a rejection mechanism dominated by electrostatic interactions between fixed membrane charges and mobile ions, while steric and hydrodynamic effects appear to be less important. Comparison with commercial nanofiltration membranes for water softening reveals that our carbon nanotube membranes provides far superior water fluxes for similar ion rejection capabilities.
Reprint Address:
Fornasiero, F, Lawrence Livermore Natl Lab, CMELS, Biosci & Biotechnol Div, Livermore, CA 94550 USA.
Research Institution addresses:
[Fornasiero, Francesco; Park, Hyung Gyu; Holt, Jason K.; Stadermann, Michael; Noy, Aleksandr; Bakajin, Olgica] Lawrence Livermore Natl Lab, CMELS, Biosci & Biotechnol Div, Livermore, CA 94550 USA
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Cited Reference Count:
17
Times Cited:
0
Publisher:
CRC PRESS-TAYLOR & FRANCIS GROUP; 6000 BROKEN SOUND PARKWAY NW, STE 300, BOCA RATON, FL 33487-2742 USA
IDS Number:
BMF49
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Title:
A High-Flux, Flexible Membrane with Parylene-encapsulated Carbon Nanotubes
Authors:
Park, HG; In, J; Kim, S; Fornasiero, F; Holt, JK; Grigoropoulos, CP; Noy, A; Bakajin, O
Author Full Names:
Park, H. G.; In, J.; Kim, S.; Fornasiero, F.; Holt, J. K.; Grigoropoulos, C. P.; Noy, A.; Bakajin, O.
Source:
NSTI NANOTECH 2008, VOL 1, TECHNICAL PROCEEDINGS : 43-46 2008
Language:
English
Document Type:
Proceedings Paper
Author Keywords:
membrane; carbon nanotube; parylene; high-flux
KeyWords Plus:
BOUNDARY-CONDITIONS; MASS-TRANSPORT; WATER; NANOPORES; FABRICATION; FLOW; ARRAYS
Abstract:
We present fabrication and characterization of a membrane based on carbon nanotubes (CNTs) and parylene. Carbon nanotubes have shown orders of magnitude enhancement in gas and water permeability compared to estimates generated by conventional theories [1, 2]. Large area membranes that exhibit flux enhancement characteristics of carbon nanotubes may provide an economical solution to a variety of technologies including water desalination [3] and gas sequestration [4]. We report a novel method of making carbon nanotube-based, robust membranes with large areas. A vertically aligned dense carbon nanotube array is infiltrated with parylene. Parylene polymer creates a pinhole free transparent film by exhibiting high surface conformity and excellent crevice penetration. Using this moisture-, chemical- and solvent-resistant polymer creates carbon nanotube membranes that promise to exhibit high stability and biocompatibility. CNT membranes are formed by releasing a free-standing film !
that consists of parylene-infiltrated CNTs, followed by CNT uncapping on both sides of the composite material. Thus fabricated membranes show flexibility and ductility due to the parylene matrix material. These membranes have a potential for applications that may require high flux, flexibility and durability.
Reprint Address:
Park, HG, LLNS LLC, Livermore, CA USA.
Research Institution addresses:
[Park, H. G.; Fornasiero, F.; Holt, J. K.; Noy, A.; Bakajin, O.] LLNS LLC, Livermore, CA USA
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Cited Reference Count:
27
Times Cited:
0
Publisher:
CRC PRESS-TAYLOR & FRANCIS GROUP; 6000 BROKEN SOUND PARKWAY NW, STE 300, BOCA RATON, FL 33487-2742 USA
IDS Number:
BMF46
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