Navigation Links
Researchers create gold aluminum, black platinum, blue silver
Date:2/1/2008

Using a tabletop laser, a University of Rochester optical scientist has turned pure aluminum, gold.

And blue. And gray. And many other colors. And it works for every metal tested, including platinum, titanium, tungsten, silver, and gold.

Chunlei Guo, the researcher who a year ago used intense laser light to alter the properties of a variety of metals to render them pitch black, has pushed the same process further in a paper in todays Applied Physics Letters. He now believes its possible to alter the properties of any metal to turn it any coloreven multi-colored iridescence like a butterflys wings.

Since the process changes the intrinsic surface properties of the metal itself and is not just a coating, the color wont fade or peel, says Guo, associate professor of optics at the Institute of Optics at the University of Rochester. He suggests the possibilities are endlessa cycle factory using a single laser to produce bicycles of different colors; etching a full-color photograph of a family into the refrigerator door; or proposing with a gold engagement ring that matches your fiances blue eyes.

Since the discovery of the black metal weve been determined to get full control on getting metals to reflect only a certain color and absorb the rest, and now we finally can make a metal reflect almost any color we wish, says Guo. When we first found the process that produced a gold color, we couldnt believe it. We worked in the lab until midnight trying to figure out what other colors we could make.

Guo and his assistant, Anatoliy Vorobeyv, use an incredibly brief but incredibly intense laser burst that changes the surface of a metal, forming nanoscale and microscale structures that selectively reflect a certain color to give the appearance of a specific color or combinations of colors.

The metal-coloring research follows up on Guos breakthrough black metal discovery in late 2006, when his research team was able to create nanostructures on metal surfaces that absorbed virtually all light, making something as simple as regular aluminum into one of the darkest materials ever created.

Guos black metal, with its very high absorption properties, is ideal for any application where capturing light is desirable. The potential applications range from making better solar energy collectors, to more advanced stealth technology, he says.

The ultra-brief/ultra-intense light Guo uses is produced by a femtosecond laser, which produces pulses lasting only a few quadrillionths of a second. A femtosecond is to a second what a second is to about 32 million years. During its brief burst, Guos laser unleashes as much power as the entire electric grid of North America does, all focused onto a spot the size of a needlepoint.

The intense blast forces the surface of the metal to form nanostructurespits, globules, and strands that response incoming light in different ways depending on the way the laser pulse sculpted the structures. Since the structures are smaller than the wavelength of light, the way they reflect light is highly dependent upon their specific size and shape, says Guo. Varying the laser intensity, pulse length, and number of pulses, allows Guo to control the configuration of the nanostructures, and hence control what color the metal reflects.

Guo and Vorobyev also achieve the iridescent coloring by creating microscale lines covered with nanostructures. The lines, arranged in regular rows, cause reflected light of different wavelengths to interfere differently in different directions. The result is a piece of metal that can appear solid purple from one direction, and gray from another, or multiple colors all at once.

To alter an area of metal the size of a dime currently takes 30 minutes or more, but the researchers are working on refining the technique. Fortunately, despite the incredible intensity involved, the femtosecond laser can be powered by a simple wall outlet, meaning that when the process is refined, implementing it should be relatively simple.

The new process has worked on every metal Guo has tried, and the results are so consistent that he believes it will work for every metal known. His team is currently working to find the right tuning to create the rest of the rainbow for the solid-colored metal, including red and green.


'/>"/>

Contact: Jonathan Sherwood
jonathan.sherwood@rochester.edu
585-273-4726
University of Rochester
Source:Eurekalert  

Related biology technology :

1. Researchers Pinpoint Best Treatment to Reduce Deadly USA300, MRSA Staph Infections
2. Researchers develop darkest manmade material
3. Boost for Malaria Vaccine Development by Combining Strengths of Dutch and American Researchers
4. Researchers use magnetism to target cells to animal arteries
5. Ames Laboratory researchers solve fuel-cell membrane structure conundrum
6. Researchers outline structure of largest nonvirus particle ever crystallized
7. UD researchers race ahead with latest spintronics achievement
8. ASU researchers improve memory devices using nanotech
9. Researchers underscore limitations of genetic ancestry tests
10. Researchers measure carbon nanotube interaction
11. Stevens researchers provide new information about mass spectrometry
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Researchers create gold aluminum, black platinum, blue silver
(Date:6/27/2016)... June 27, 2016  Alex,s Lemonade Stand Foundation (ALSF), ... it will open a state-of-the-art bioinformatics lab, using ,big ... This announcement comes as Liz Scott , co-executive ... Cancer Moonshot Summit in Washington, D.C. ... a participant and advocate of pediatric cancer research and ...
(Date:6/27/2016)...  Global demand for enzymes is forecast to ... $7.2 billion.  This market includes enzymes used in ... production, animal feed, and other markets) and specialty ... and beverages will remain the largest market for ... products containing enzymes in developing regions.  These and ...
(Date:6/27/2016)... - BIOREM Inc. (TSX-V: BRM) ("Biorem" or "the Company") announces ... Clean Technology Fund I, LP and Clean Technology Fund ... venture capital funds which together hold approximately 59% of ... as converted basis), that they have entered into an ... in Biorem to TUS Holdings Co. Ltd. ("TUS") (en.tusholdings.com) ...
(Date:6/27/2016)... SAN DIEGO , June 27, 2016  Sequenom, ... company committed to enabling healthier lives through the development ... Supreme Court of the United States ... Federal courts that the claims of Sequenom,s U.S. Patent ... the patent eligibility criteria established by the Supreme Court,s ...
Breaking Biology Technology:
(Date:6/27/2016)... , June 27, 2016 Research and Markets ... America 2016-2020" report to their offering. ... North America to grow at a CAGR of 12.28% ... prepared based on an in-depth market analysis with inputs from industry ... over the coming years. The report also includes a discussion of ...
(Date:6/22/2016)... , June 22, 2016  The American College of ... Trade Show Executive Magazine as one of the fastest-growing ... May 25-27 at the Bellagio in Las Vegas ... the highest percentage of growth in each of the following ... exhibiting companies and number of attendees. The 2015 ACMG Annual ...
(Date:6/22/2016)... 22, 2016   Acuant , the ... solutions, has partnered with RightCrowd ® ... Visitor Management, Self-Service Kiosks and Continuous Workforce ... add functional enhancements to existing physical access ... venues with an automated ID verification and ...
Breaking Biology News(10 mins):