Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > How many argon atoms can fit on the surface of a carbon nanotube?

Abstract:
Scientists have devised a new way to explore how such phase transitions function in less than three dimensions and at the level of just a few atoms.

How many argon atoms can fit on the surface of a carbon nanotube?

Seattle, WA | Posted on January 30th, 2010

Phase transitions -- changes of matter from one state to another without altering its chemical makeup -- are an important part of life in our three-dimensional world. Water falls to the ground as snow, melts to a liquid and eventually vaporizes back to the clouds to begin the cycle anew.

Now a team of scientists has devised a new way to explore how such phase transitions function in less than three dimensions and at the level of just a few atoms. They hope the technique will be useful to test aspects of what until now has been purely theoretical physics, and they hope it also might have practical applications for sensing conditions at very tiny scales, such as in a cell membrane.

They worked with single-walled carbon nanotubes, extremely thin, hollow graphite structures that can be so tiny that they are nearly one-dimensional, to study the phase transition behavior of argon and krypton atoms.

"The physics can be quite different in fewer than three dimensions," said David Cobden, an associate professor of physics at the University of Washington and corresponding author of a paper describing the work published Friday (Jan. 29) in Science.

Co-authors, all from the UW, are Zenghui Wang, Jiang Wei, Peter Morse, J. Gregory Dash and Oscar Vilches.

For their observations, the group used carbon nanotubes, microscopic cylinders that have some thickness but are very close to being one-dimensional.

Phase transitions change the density of atoms. In the vapor form, there are fewer atoms and they are loosely packed. Liquid has more atoms and they are more tightly packed. The solid is a crystal formed of very tightly packed atoms. To determine the phase of the argon and krypton atoms, the researchers used the carbon nanotube much like a guitar string stretched over a fret. A nearby piece of conducting metal applied an electrical force to oscillate the string, and the scientists measured the current to "listen" as the vibration frequency changed -- a greater mass of atoms sticking to the nanotube surface produced a lower frequency.

"You listen to this nano guitar and as the pitch goes down you know there are more atoms sticking to the surface," Cobden said. "In principle you can hear one atom landing on the tube -- it's that sensitive."

The researchers also found that the nanotube's electrical resistance changed when krypton atoms stuck to the surface.

In the future, the scientists hope to be able to see how the atoms, as they populate the carbon nanotube, react to each other through various phase transitions, and also how they interact with the pure carbon graphite of the nanotube. They expect to see some significant differences in experiments approaching one dimension from those in two or three dimensions.

"For example, matter can freeze in 3-D and in 2-D, but theoretically it should not freeze in 1-D," Cobden said.

Besides providing a test bed for physics theories, the work also could be useful for sensing applications, such as nanoscale measurements in various fluid environments, examining functions within cell membranes or probing within nerves.

"Nanotubes allow you to probe things at the subcellular level," Cobden said.

The work was funded by the National Science Foundation, the American Chemical Society Petroleum Research Fund, the UW Royalty Research Fund and the UW University Initiatives Fund.

####

About University of Washington
Founded in 1861, the University of Washington is one of the oldest state-supported institutions of higher education on the West Coast and is one of the preeminent research universities in the world.

For more information, please click here

Contacts:
David Cobden
206-372-2456
206-543-2686

Copyright © University of Washington

If you have a comment, please Contact us.

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

Stanford breakthrough heralds super-efficient light-based computers: Light can transmit more data while consuming far less power than electricity, and an engineering feat brings optical data transport closer to replacing wires May 29th, 2015

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Physics

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

Govt.-Legislation/Regulation/Funding/Policy

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Physicists precisely measure interaction between atoms and carbon surfaces May 28th, 2015

Linking superconductivity and structure May 28th, 2015

Chemists discover key reaction mechanism behind the highly touted sodium-oxygen battery May 28th, 2015

Possible Futures

Global Carbon Nanotubes (CNT) Market Expected To Reach USD 3.42 Billion By 2022 May 29th, 2015

Global Nano-Enabled Packaging Market For Food and Beverages Will Reach $15.0 billion in 2020 May 26th, 2015

Simulations predict flat liquid May 21st, 2015

Nature inspires first artificial molecular pump: Simple design mimics pumping mechanism of life-sustaining proteins found in living cells May 19th, 2015

Nanotubes/Buckyballs/Fullerenes

Global Carbon Nanotubes (CNT) Market Expected To Reach USD 3.42 Billion By 2022 May 29th, 2015

SouthWest NanoTechnologies Introduces AgeNT™ Transparent Conductor System at SID Display Week, Booth #543 May 28th, 2015

Physicists precisely measure interaction between atoms and carbon surfaces May 28th, 2015

Basel physicists develop efficient method of signal transmission from nanocomponents May 23rd, 2015

Nanomedicine

New chip makes testing for antibiotic-resistant bacteria faster, easier: Researchers at the University of Toronto design diagnostic chip to reduce testing time from days to one hour, allowing doctors to pick the right antibiotic the first time May 28th, 2015

Arrowhead to Present at Jefferies 2015 Healthcare Conference May 27th, 2015

Seeing the action: UCSB researchers develop a novel device to image the minute forces and actions involved in cell membrane hemifusion May 27th, 2015

Nanotechnology identifies brain tumor types through MRI 'virtual biopsy' in animal studies: If results are confirmed in humans, tumor cells could someday be diagnosed by MRI imaging and treated with tumor-specific IV injections; new NIH grant will fund future study May 27th, 2015

Sensors

SouthWest NanoTechnologies Introduces AgeNT™ Transparent Conductor System at SID Display Week, Booth #543 May 28th, 2015

Technology for Tomorrow’s Market Opportunities and Challenges: LetiDays Grenoble Presents the Possibilities: June 24-25 Event Includes Focus on IoT-Augmented Mobility and Leti’s Latest Results on Silicon Technologies, Sensors, Health Applications and Smart Cities May 27th, 2015

This Slinky lookalike 'hyperlens' helps us see tiny objects: The photonics advancement could improve early cancer detection, nanoelectronics manufacturing and scientists' ability to observe single molecules May 23rd, 2015

Record high sensitive Graphene Hall sensors May 21st, 2015

Discoveries

Stanford breakthrough heralds super-efficient light-based computers: Light can transmit more data while consuming far less power than electricity, and an engineering feat brings optical data transport closer to replacing wires May 29th, 2015

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

New technique speeds nanoMRI imaging: Multiplexing technique for nanoscale magnetic resonance imaging developed by researchers in Switzerland cuts normal scan time from two weeks to two days May 28th, 2015

Announcements

Stanford breakthrough heralds super-efficient light-based computers: Light can transmit more data while consuming far less power than electricity, and an engineering feat brings optical data transport closer to replacing wires May 29th, 2015

Donuts, math, and superdense teleportation of quantum information May 29th, 2015

OSU researchers prove magnetism can control heat, sound: Team leverages OSC services to help confirm, interpret experimental findings May 29th, 2015

Two UCSB Professors Receive Early Career Research Awards: The Department of Energy’s award for young scientists acknowledges UC Santa Barbara’s standing as a top tier research institution May 29th, 2015

Nanobiotechnology

New technique speeds nanoMRI imaging: Multiplexing technique for nanoscale magnetic resonance imaging developed by researchers in Switzerland cuts normal scan time from two weeks to two days May 28th, 2015

Seeing the action: UCSB researchers develop a novel device to image the minute forces and actions involved in cell membrane hemifusion May 27th, 2015

Nanotechnology identifies brain tumor types through MRI 'virtual biopsy' in animal studies: If results are confirmed in humans, tumor cells could someday be diagnosed by MRI imaging and treated with tumor-specific IV injections; new NIH grant will fund future study May 27th, 2015

Who needs water to assemble DNA? Non-aqueous solvent supports DNA nanotechnology May 27th, 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