Free Newsletters - Space News - Defense Alert - Environment Report - Energy Monitor
. Space Industry and Business News .




TECH SPACE
Nanowelding Using Light And Nanorods In Solid Materials
by Staff Writers
Raleigh NC (SPX) Feb 28, 2013


Polarized light selectively heats and melts nanofibers containing aligned gold nanorods within a cross-hatched mat when the polarization direction is parallel to the nanofiber direction.

Researchers from North Carolina State University have developed a way to melt or "weld" specific portions of polymers by embedding aligned nanoparticles within the materials. Their technique, which melts fibers along a chosen direction within a material, may lead to stronger, more resilient nanofibers and materials.

Physicists Jason Bochinski and Laura Clarke, with materials scientist Joe Tracy, placed specifically aligned gold nanorods within a solid material. Gold nanorods absorb light at different wavelengths, depending upon the size and orientation of the nanorod, and then they convert that absorbed light directly into heat.

In this case, the nanorods were designed to respond to light wavelengths of 520 nanometers (nm) in a horizontal alignment and 800 nm when vertically aligned. Human beings can see light at 520 nm (it looks green), while 808 nm is in the near infrared spectrum, invisible to our eyes.

When the different wavelengths of light were applied to the material, they melted the fibers along the chosen directions, while leaving surrounding fibers largely intact.

"Being able to heat materials spatially in this way gives us the ability to manipulate very specific portions of these materials, because nanorods localize heat - that is, the heat they produce only affects the nanorod and its immediate surroundings," Tracy says.

According to Bochinski, the work also has implications for optimizing materials that have already been manufactured: "We can use heat at the nanoscale to change mechanical characteristics of objects postproduction without affecting their physical properties, which means more efficiency and less waste."

The researchers' findings appear in Particle and Particle Systems Characterization. The work was funded by grants from the National Science Foundation and Sigma Xi. Graduate students Wei-Chen Wu and Somsubhra Maity and former undergraduate student Krystian Kozek contributed to the work.

.


Related Links
North Carolina State University
Space Technology News - Applications and Research






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





TECH SPACE
Tungstenite triangles emit light
London, UK (SPX) Feb 28, 2013
Researchers in the US have succeeded in growing single atomic layers of the naturally occurring mineral tungstenite for the first time. The sheets appear to have unusual photoluminescence properties that might be exploited in optics devices like lasers and light-emitting diodes. 2D materials have dramatically different electronic and mechanical properties from their 3D counterparts and so ... read more


TECH SPACE
Ancient Egyptian pigment points to new security ink technology

Laser mastery narrows down sources of superconductivity

In probing mysteries of glass, researchers find a key to toughness

Glasses.com turns heads with 3-D iPad app

TECH SPACE
Boeing Receives USAF Contract for Integrated C4ISR Targeting Solution

Air Operations Center Modernization Program PDR Completed

Advanced Communications Waveforms Ported To Navy Digital Modular Radios

Astrium tapped for communications network

TECH SPACE
'Faulty Ukrainian Parts' Blamed for Zenit Launch Failure

The light-lift member of Arianespace's launcher family is readied for its second mission

SpaceX 2 Launch Set for March 1

NASA Releases Glory Taurus XL Launch Failure Report Summary

TECH SPACE
USAF Awards Lockheed Martin Contracts to Begin Work on Next Set of GPS III Satellites

Telit Offers COMBO 2G Chip For Multi Satellite Positioning Receiver

Boeing Awarded USAF Contract to Continue GPS Modernization

A system that improves the precision of GPS in cities by 90 percent

TECH SPACE
US chooses Brazilian plane to outfit Afghan force

F-35 soaring costs trouble Australia

Larry Ellison buys Hawaiian airline to go with island

DARPA Developing Next Generation Of Vertical Flight Technology

TECH SPACE
Rutgers physicists test highly flexible organic semiconductors

Quantum computers turn mechanical

Boeing Acquires CPU Tech's Microprocessor Business

Organic electronics: how to make contact between carbon compounds and metal

TECH SPACE
NASA's Aquarius Sees Salty Shifts

Northrop Grumman Delivers First Communications Payload for USAF's Enhanced Polar System

NASA Selects Launch Services for ICESat-2 Mission

New approach alters malaria maps

TECH SPACE
China lawyer appeals 'state secret' pollution claim

Sewage lagoons remove most - but not all - pharmaceuticals

Olympics: Illegal dump tarnishes 'green' Sochi Games

China admits pollution-linked 'cancer villages'




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement