Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Carbon nanotubes grown in combustion flames

02.06.2015

An international research team’s theoretical simulation of the synthesis of single-walled carbon nanotubes has revealed important details of the mechanisms at play. This could lead to better ways to control the production of carbon nanotubes.

The synthesis of carbon nanotubes (CNTs), with a view to their industrial-scale production, is attracting heavy scientific interest. Their unique chemical properties promise a wide variety of groundbreaking uses in acoustic, biomedical, electronic, environmental, optical and structural technologies.


Copyright : Institute of Transformative Bio-Molecules (ITbM), Nagoya University

Led by Professor Stephan Irle of the Institute of Transformative Bio-Molecules at Nagoya University, a team of researchers in Japan, the United States and China conducted computer simulations that show similar molecular mechanisms at work in the growth of carbon nanotubes and the combustion of hydrocarbons to form soot. This discovery challenges a previously accepted view that metal carbides are needed to create nanotubes, through a process called chemical vapour deposition.

The team’s own models suggest that alternative chemical processes such as hydrogen- bstraction/acetylene addition – a mechanism often observed in combustion processes – could also be used to grow carbon nanotubes. “This finding is very intriguing in the sense that these processes were long considered to proceed by completely different mechanisms,” says Professor Irle.

In 2014, the team reported the first growth simulations of single-walled carbon nanotube synthesis, using acetylene as a feedstock. Their simulation model used acetylene due to the relatively low temperatures needed to catalyse chemical vapour deposition, and because even small amounts speed up reactions significantly. According to the researchers, their modelling suggests that acetylene’s potential role needs further study, as does the currently accepted model for carbon nanotube production.

Since publishing their results, the researchers have started modelling the synthesis of graphene – a one atomthick layer of pure carbon – using nickel and copper with a methane catalyst. They hope to publicly release the new simulation model – based on a direct version of a kinetic Monte Carlo simulation where reaction channels are predicted automatically on the fly as the growth process proceeds – in 2015.

DID YOU KNOW?
Carbon nanotubes are nanocylinders consisting of one atom-thick sheets of carbon (or graphene). They are currently used as additives to strengthen various structural materials, and may also be used for energy storage as well as in the next generation of nanoelectronics and biomedical devices. CNTs are often synthesised via chemical vapour deposition, in which hydrocarbon vapour is deposited on metal catalysts under a flow of non-reactive gas at high temperatures. However, quality control is a challenge since this method usually results in the production of CNTs with variable diameters and different sidewall structures.

For further information contact:
Professor Stephan Irle
Institute of Transformative Bio-Molecules
World Premier International Research Center Initiative
Nagoya University, Japan
E-mail: sirle@chem.nagoya-u.ac.jp
Institute of Transformative Bio-Molecules (ITbM), Nagoya University

*This article also appears in Asia Research News 2015 (P.61).


Associated links
Read Asia Research News 2015
Download a copy of Asia Research News 2015 for free

Ayako Miyazaki | ResearchSEA

More articles from Life Sciences:

nachricht Nanoparticle Exposure Can Awaken Dormant Viruses in the Lungs
16.01.2017 | Helmholtz Zentrum München - Deutsches Forschungszentrum für Gesundheit und Umwelt

nachricht Cholera bacteria infect more effectively with a simple twist of shape
13.01.2017 | Princeton University

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Designing Architecture with Solar Building Envelopes

Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.

As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...

Im Focus: How to inflate a hardened concrete shell with a weight of 80 t

At TU Wien, an alternative for resource intensive formwork for the construction of concrete domes was developed. It is now used in a test dome for the Austrian Federal Railways Infrastructure (ÖBB Infrastruktur).

Concrete shells are efficient structures, but not very resource efficient. The formwork for the construction of concrete domes alone requires a high amount of...

Im Focus: Bacterial Pac Man molecule snaps at sugar

Many pathogens use certain sugar compounds from their host to help conceal themselves against the immune system. Scientists at the University of Bonn have now, in cooperation with researchers at the University of York in the United Kingdom, analyzed the dynamics of a bacterial molecule that is involved in this process. They demonstrate that the protein grabs onto the sugar molecule with a Pac Man-like chewing motion and holds it until it can be used. Their results could help design therapeutics that could make the protein poorer at grabbing and holding and hence compromise the pathogen in the host. The study has now been published in “Biophysical Journal”.

The cells of the mouth, nose and intestinal mucosa produce large quantities of a chemical called sialic acid. Many bacteria possess a special transport system...

Im Focus: Newly proposed reference datasets improve weather satellite data quality

UMD, NOAA collaboration demonstrates suitability of in-orbit datasets for weather satellite calibration

"Traffic and weather, together on the hour!" blasts your local radio station, while your smartphone knows the weather halfway across the world. A network of...

Im Focus: Repairing defects in fiber-reinforced plastics more efficiently

Fiber-reinforced plastics (FRP) are frequently used in the aeronautic and automobile industry. However, the repair of workpieces made of these composite materials is often less profitable than exchanging the part. In order to increase the lifetime of FRP parts and to make them more eco-efficient, the Laser Zentrum Hannover e.V. (LZH) and the Apodius GmbH want to combine a new measuring device for fiber layer orientation with an innovative laser-based repair process.

Defects in FRP pieces may be production or operation-related. Whether or not repair is cost-effective depends on the geometry of the defective area, the tools...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

12V, 48V, high-voltage – trends in E/E automotive architecture

10.01.2017 | Event News

2nd Conference on Non-Textual Information on 10 and 11 May 2017 in Hannover

09.01.2017 | Event News

Nothing will happen without batteries making it happen!

05.01.2017 | Event News

 
Latest News

Multiregional brain on a chip

16.01.2017 | Power and Electrical Engineering

New technology enables 5-D imaging in live animals, humans

16.01.2017 | Information Technology

Researchers develop environmentally friendly soy air filter

16.01.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>