Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > Gas, gas, quick boys

Abstract:
TERRORISM is most commonly associated with the bomb and the bullet, but ever since an incident on the Tokyo subway system in 1995, the security services have also had to worry about poison gas.

That attack, which used a nerve-gas called sarin, killed 12 people and severely injured another 50. Sarin is to be feared because it is invisible, odourless and 500 times more deadly than cyanide. However, other gases (not least cyanide itself) could be used instead. What is needed is a cheap way of detecting such gases and, having raised the alarm, of identifying which gas is involved so that anyone who has succumbed can be treated.

And that is what a team of chemical engineers at the Massachusetts Institute of Technology, led by Michael Strano (pictured on the left), think they have created. Not only can their new sensor tell between chemical agents, it can detect them at previously unattainable concentrations—as low as 25 parts in a trillion.

The core of Dr Strano's invention, which he describes in Angewandte Chemie, is an array of treated carbon nanotubes. Each is, in essence, a layer of carbon atoms that has been coated with nitrogen-containing molecules called amines and rolled into a cylinder with the amines on the outside. Individual tubes, which are about 1/50,000 of the width of a human hair in diameter, are arranged so that they run between pairs of tiny electrodes. When the device is switched on the nanotubes carry an electric current with a power of about 300 microwatts.

The gases to be analysed reach the nanotubes through a miniature column etched onto a silicon chip. As they pass along this column they tend to stick to its sides. Some gases stick more than others, and hence travel more slowly down the column. In this way the components of the sample separate from one another. Each component is puffed onto the nanotubes, where it sticks to the carbon atoms. This, in turn, causes the conductivity of the nanotubes to change—how much is a characteristic of each gas.


Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

'Lasers rewired': Scientists find a new way to make nanowire lasers: Berkeley Lab, UC Berkeley scientists adapt next-gen solar cell materials for a different purpose February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Sensors

Scientists have put a high precision blood assay into a simple test strip: Researchers have developed a new biosensor test system based on magnetic nanoparticles February 3rd, 2016

Nanosheet growth technique could revolutionize nanomaterial production February 1st, 2016

New record in nanoelectronics at ultralow temperatures January 28th, 2016

NBC LEARN DEBUTS SIX-PART VIDEO SERIES, “NANOTECHNOLOGY: SUPER SMALL SCIENCE” Produced by NBC Learn in partnership with the National Science Foundation, and narrated by NBC News/MSNBC’s Kate Snow, series highlights leading research in nanotechnology January 25th, 2016

Announcements

Graphene leans on glass to advance electronics: Scientists' use of common glass to optimize graphene's electronic properties could improve technologies from flat screens to solar cells February 12th, 2016

Breaking cell barriers with retractable protein nanoneedles: Adapting a bacterial structure, Wyss Institute researchers develop protein actuators that can mechanically puncture cells February 12th, 2016

Replacement of Toxic Antibacterial Agents Possible by Biocompatible Polymeric Nanocomposites February 12th, 2016

Properties of Polymeric Nanofibers Optimized to Treat Damaged Body Tissues February 12th, 2016

Homeland Security

Detecting and identifying explosives with single test December 10th, 2015

Columbia engineers build biologically powered chip: System combines biological ion channels with solid-state transistors to create a new kind of electronics December 7th, 2015

Nanoparticle delivery maximizes drug defense against bioterrorism agent: UCLA team develops method for improving drug’s efficacy while reducing side effects November 6th, 2015

Toward clearer, cheaper imaging of ultrafast phenomena: A new, all-optical method for compressing narrow electron pulses to a billionth of a billionth of a second could improve real-time movies of chemical reactions and other ultrafast processes October 14th, 2015

NanoNews-Digest
The latest news from around the world, FREE





  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







Car Brands
Buy website traffic