Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > News > Simulating hypersonic nanoparticle collisions

August 20th, 2008

Simulating hypersonic nanoparticle collisions

Abstract:
What happens when you fire a silicon nanoparticle at a silicon surface at 900 m/s? What about at 2,000 m/s? As it turns out, two completely different things occur; bouncing or sticking, and the transition between the two responses occurs at a speed between 1,250 and 1,550 m/s.

Why would anyone care about this? As scientists and engineers seek to create new materials by exploiting nanoscale features and the different physical and chemical effects that dominate at these small scales, control of the entire process becomes key. Control over nanoparticle formation in the gas phase, and deposition onto a surface are key for "manufacturing novel nanostructured surfaces and thin films," according to, M. Suri and T. Dumitrica, a pair of mechanical engineers at the University of Minnesota, and the authors of an upcoming paper in Physical Review B.

The authors look at the example of coating a surface with silicon spheres, which has been problematic. The difficulty is due to the different physics that play a dominant role at such short length and time scales. On the macroscale, inelastic impacts have their energy released due to the formation of dislocations within the material, but according to the authors there is not enough time or space for this mechanism to occur within a nanoparticle. Secondly, silicon nanospheres have been found to be extremely hard, over four times the bulk yield stress was required to generate yield in these tiny balls. Finally the system is complicated by the chemistry of the surface of the particle and surface material. If they are both bare silicon, then the nanoparticle will easily become chemically bound by a substrate. If the surfaces are passivated with hydrogen, then bonds do not form as easily.

Source:
arstechnica.com

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

3rd Iran-Proposed Nano Standard Approved by International Standard Organization November 22nd, 2014

NMTI announces breakthrough solutions for HAMR nanoantenna for next-generation ultra-high density magnetic storage November 21st, 2014

Sustainable Nanotechnologies Project November 20th, 2014

Quantum mechanical calculations reveal the hidden states of enzyme active sites November 20th, 2014

Physics

Researchers discern the shapes of high-order Brownian motions November 17th, 2014

Heat Transfer Sets the Noise Floor for Ultrasensitive Electronics November 11th, 2014

Noise in a microwave amplifier is limited by quantum particles of heat November 10th, 2014

Live Images from the Nano-cosmos: Researchers watch layers of football molecules grow November 5th, 2014

Discoveries

NMTI announces breakthrough solutions for HAMR nanoantenna for next-generation ultra-high density magnetic storage November 21st, 2014

UO-industry collaboration points to improved nanomaterials: University of Oregon microscope puts spotlight on the surface structure of quantum dots for designing new solar devices November 20th, 2014

Silver Nanoparticles Produced in Iran from Forest Plants Extract November 20th, 2014

Nano Sorbents Able to Remove Pollutions Caused by Oil Derivatives November 20th, 2014

Announcements

3rd Iran-Proposed Nano Standard Approved by International Standard Organization November 22nd, 2014

NMTI announces breakthrough solutions for HAMR nanoantenna for next-generation ultra-high density magnetic storage November 21st, 2014

Silver Nanoparticles Produced in Iran from Forest Plants Extract November 20th, 2014

Nano Sorbents Able to Remove Pollutions Caused by Oil Derivatives November 20th, 2014

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







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE