Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Engineers: Weak laser can ignite nanoparticles, with exciting possibilities

19.03.2010
University of Florida engineering researchers have found they can ignite certain nanoparticles using a low-power laser, a development they say opens the door to a wave of new technologies in health care, computing and automotive design.

A paper about the research appears in this week’s advance online edition of Nature Nanotechnology.

Vijay Krishna, Nathanael Stevens, Ben Koopman and Brij Moudgil say they used lasers not much more intense than those found in laser pointers to light up, heat or ignite manufactured carbon molecules, known as fullerenes, whose soccer-ball-like shapes had been distorted in certain ways. They said the discovery suggests a score of important new applications for these so-called “functionalized fullerenes” molecules already being developed for a broad range of industries and commercial and medical products.

“The beauty of this is that it only requires a very low intensity laser,” said Moudgil, professor of materials science and engineering and director of the engineering college’s Particle Engineering Research Center, where the research was conducted.

The researchers used lasers with power in the range of 500 milliwatts. Though weak by laser standards, the researchers believe the lasers have enough energy to initiate the uncoiling or unraveling of the modified or functionalized fullerenes. That process, they believe, rapidly releases the energy stored when the molecules are formed into their unusual shapes, causing light, heat or burning under different conditions.

The Nature Nanotechnology paper says the researchers tested the technique in three possible applications.

In the first, they infused cancer cells in a laboratory with a variety of functionalized fullerenes known to be biologically safe called polyhydroxy fullerenes. They then used the laser to heat the fullerenes, destroying the cancer cells from within.

“It caused stress in the cells, and then after 10 seconds we just see the cells pop,” said Krishna, a postdoctoral associate in the Particle Engineering Research Center.

He said the finding suggests doctors could dose patients with the polyhdroxy fullerenes, identify the location of cancers, then treat them using low-power lasers, leaving other tissues unharmed. Another application would be to image the locations of tumors or other areas of interest in the body using the fullerenes’ capability to light up.

The paper also reports the researchers used fullerenes to ignite a small explosive charge. The weak laser contained far less energy than standard electrical explosive initiators, the researchers said, yet still ignited a type of functionalized fullerenes called carboxy fullerenes. That event in turn ignited comparatively powerful explosives used in traditional blasting caps.

Mining, tunneling or demolition crews currently run electrical lines to explosives, a time-consuming and expensive process for distant explosives. The experiment suggests crews could use blasting caps armed with the fullerenes and simply point a laser to set them off.

“Traditional bursting caps require a lot of energy to ignite — they use a hot tungsten filament,” said Nathanael Stevens, a postdoctoral associate in the Particle Engineering Research Center. “So, it is interesting that we can do it with just a low-powered laser.”

The researchers coated paper with polyhyroxy fullerenes, then used an ultrahigh resolution laser to write a miniature version of the letters “UF.” The demonstration suggests the technique could be used for many applications that require extremely minute, precise, lithography. Moudgil said the researchers had developed one promising application involving creating the intricate patterns on computer chips.

Although not discussed in the paper, other potential applications include infusing the fullerenes in gasoline, then igniting them with lasers rather than traditional sparkplugs in car engines, Moudgil said. Because the process is likely to burn more of the gasoline entering the cylinders, it could make cars more efficient and less polluting.

The researchers have identified more than a dozen potential applications and applied for several patents. This week’s Nature Nanotechnology paper is the first scientific publication on the discovery and the new technique.

Writer
Aaron Hoover, ahoover@ufl.edu, 352-392-0186
Source
Vijay Krishna, vkrishna@perc.ufl.edu, 352-846-1194
Source
Brij Moudgil, bmoudgil@perc.ufl.edu, 352-846-1194

Vijay Krishna | EurekAlert!
Further information:
http://www.ufl.edu

More articles from Physics and Astronomy:

nachricht NASA detects solar flare pulses at Sun and Earth
17.11.2017 | NASA/Goddard Space Flight Center

nachricht Pluto's hydrocarbon haze keeps dwarf planet colder than expected
16.11.2017 | University of California - Santa Cruz

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

Im Focus: Wrinkles give heat a jolt in pillared graphene

Rice University researchers test 3-D carbon nanostructures' thermal transport abilities

Pillared graphene would transfer heat better if the theoretical material had a few asymmetric junctions that caused wrinkles, according to Rice University...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

NASA detects solar flare pulses at Sun and Earth

17.11.2017 | Physics and Astronomy

NIST scientists discover how to switch liver cancer cell growth from 2-D to 3-D structures

17.11.2017 | Health and Medicine

The importance of biodiversity in forests could increase due to climate change

17.11.2017 | Studies and Analyses

VideoLinks
B2B-VideoLinks
More VideoLinks >>>