Navigation Links
Nanotubes go with the flow
Date:1/23/2008

Carbon nanotubes are attractive candidates for use as the active elements in the next generation of electronic devices. However, it has proven incredibly difficult to align nanotubes within device architectures. Most of the approaches for lining up carbon nanotubes reported until now are only applicable to discrete devices and are not readily scalable to the levels required for the mass production of nanotube-based chips. Now, this seemingly intractable problem has been overcome by a collaborative team of researchers from Seoul National University and Sungkyunkwan in South Korea. Kahp Suh and his colleagues have developed a technique for aligning nanotubes over large areas based on the flow of a nanotube-containing solution through nanochannels. This technique is especially attractive because of its simplicity; no external stimuli such as the application of an electric field or syringe pumping are required to align the nanotubes.

This novel approach for aligning carbon nanotubes is based on the simple flow of a nanotube solution through a nanochannel fabricated from a charged polymeric mold. The nanotubes are ordered within the channels by the influence of the capillary force existing within the confines of the channel. When the channels are of the correct geometry, aqueous solutions containing nanotubes enter from both ends, and upon evaporation leave behind dense and highly oriented arrays of nanotubes. Suh cautions that the mechanical properties and surface chemistry of the polymeric mold used for making the nanochannels are of paramount importance. The stiffness of the polymer has to be just right, says Suh, it has to be rigid enough to keep the nanochannels from collapsing but flexible enough to bond well with the substrate over a large area. Good adhesion is required between the nanochannel and the substrate to prevent the polymer nanochannels from coming unstuck upon the introduction of the aqueous nanotube solution. The researchers have found that polyethylene glycol diacrylate has the right combination of properties for use as the polymer mold. It is negatively charged and facilitates conformal contact with the substrate. Moreover, it is hydrophilic and thus the nanotube solution is able to enter and flow through the channels without need for additional pumping.

Suh further added that this approach represents a promising advance for the integration of nanotubes in microscale devices. The use of fluidics to bring typically unruly bundles of nanotubes into line may help to solve prevailing bottlenecks for scaling up the production of nanotube devices.


'/>"/>

Contact: Kahp Y. Suh
sky4u@snu.ac.kr
822-880-9103
Wiley-Blackwell
Source:Eurekalert

Related biology technology :

1. Carbon nanotubes to be replaced by MoSIx nanowires in high-tech devices says new study
2. Improved wettability of carbon nanotubes opens the door to new possibilities
3. Understanding of actuator properties of carbon nanotubes bring micro machines closer
4. The sensitive side of carbon nanotubes: Creating powerful pressure sensors
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/23/2017)... DIEGO and SAN FRANCISCO ... a privately-held regenerative medicine company, and Beyond Type 1, ... with type 1 diabetes, today announced a grant from ... a functional cure for type 1 and other insulin-requiring ... ViaCyte has been developing innovative stem cell-derived cell replacement ...
(Date:2/22/2017)... ... February 22, 2017 , ... ... acquired Kendall Research Systems, LLC (KRS) clinical development program. KRS is ... interface technology for research and clinical applications. The terms of the transaction were ...
(Date:2/22/2017)... , Feb. 22, 2017 Scientists propose in ... and organ damage in Gaucher and maybe other lysosomal ... and lower costs than current therapies. An ... Medical Center , which also included investigators from the ... report their data Feb. 22. The study was conducted ...
(Date:2/22/2017)... ... February 22, 2017 , ... ... and scientists from around the world, is pleased to announce the 2nd annual ... 23, 2017. This premier, online-only conference focused on the development and advancements in ...
Breaking Biology Technology:
(Date:2/8/2017)... NEW YORK , Feb. 8, 2017 /PRNewswire/ ... an individual,s voice to match it against a ... voice such as pitch, cadence, and tone are ... systems require minimal hardware installation, as most PCs ... remotely for different transactions. Voice recognition biometrics are ...
(Date:2/8/2017)... NEW YORK , Feb. 7, 2017 /PRNewswire/ ... point. Driven largely by the confluence of organizations, ... users, distaste for knowledge-based systems (password and challenge ... consumer, industrial, and government systems. The market is ... been a demarcation between consumer and enterprise uses ...
(Date:2/7/2017)... 7, 2017 Zimmer Biomet Holdings, Inc. (NYSE ... will present at the LEERINK Partners 6th Annual Global ... on Wednesday, February 15, 2017 at 10 a.m. Eastern ... presentation can be accessed at http://wsw.com/webcast/leerink28/zbh .  The ... via Zimmer Biomet,s Investor Relations website at http://investor.zimmerbiomet.com ...
Breaking Biology News(10 mins):