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

Scientists Test Nanoparticle "Alarm Clock" to Awaken Immune Systems Put to Sleep by Cancer July 25th, 2014

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

Silicene Labs Announces the Launch of Patent-Pending, 2D Materials Composite Index™ : The Initial 2D Materials Composite Index™ for Q2 2014 Is: 857.3; Founders Include World-Renowned Physicist and Seasoned Business and IP Professionals July 24th, 2014

Iranian Scientists Produce Transparent Nanocomposite Coatings with Longer Lifetime July 24th, 2014

Physics

Physicists Use Computer Models to Reveal Quantum Effects in Biological Oxygen Transport: The team solved a long-standing question by explaining why oxygen – and not deadly carbon monoxide – preferably binds to the proteins that transport it around the body. July 17th, 2014

Flashes of light on the superconductor: Using light to modulate the properties of a copper-based superconductor July 15th, 2014

Weizmann Institute scientists take another step down the long road toward quantum computers July 14th, 2014

University of Illinois study advances limits for ultrafast nano-devices July 10th, 2014

Discoveries

Scientists Test Nanoparticle "Alarm Clock" to Awaken Immune Systems Put to Sleep by Cancer July 25th, 2014

Iranian Scientists Produce Transparent Nanocomposite Coatings with Longer Lifetime July 24th, 2014

UCF Nanotech Spinout Developing Revolutionary Battery Technology: Power the Next Generation of Electronics with Carbon July 23rd, 2014

A Crystal Wedding in the Nanocosmos July 23rd, 2014

Announcements

Scientists Test Nanoparticle "Alarm Clock" to Awaken Immune Systems Put to Sleep by Cancer July 25th, 2014

A*STAR and industry form S$200M semiconductor R&D July 25th, 2014

Silicene Labs Announces the Launch of Patent-Pending, 2D Materials Composite Index™ : The Initial 2D Materials Composite Index™ for Q2 2014 Is: 857.3; Founders Include World-Renowned Physicist and Seasoned Business and IP Professionals July 24th, 2014

Iranian Scientists Produce Transparent Nanocomposite Coatings with Longer Lifetime July 24th, 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