Navigation Links
Metals shape up with a little help from friends
Date:6/30/2008

al. The innovative use of the ligands allows for the metal nanoparticles to be dissolved--even at high concentrations--in such a solution. A block co-polymer is made up of two different long chains, or blocks, of molecules linked together to form a predictable pattern. In the experiment, depicted in the illustration at right, ligand-coated platinum nanoparticles (shown as blue and gray balls) are nestled amongst the block co-polymers (shown as blue and green strands).

After the ligand-coated nanoparticles and polymers assemble in regular patterns, the material is heated to high temperatures in the absence of air to convert the polymers to a carbon scaffold. The scaffold is then allowed to cool. Because the metal nanoparticles have a very low melting point, without the carbon scaffold they would stubbornly fuse together in an uncontrolled fashion. Using this process, the carbon scaffold can be etched away with an acid, leaving behind a structured solid metal.

The Cornell group used the new method to create a platinum structure (see illustration above) with uniform hexagonal pores, each on the order of 10 nm across--a much larger diameter than previous attempts have been able to produce. Platinum is, so far, the best available catalyst for fuel cells, and a spacious pore structure allows fuel to flow through and react over a larger surface area.

"It opens a completely novel playground because no one has been able to structure metals in bulk ways using polymers," Wiesner explained. "In principle, if you can do it with one metal you can do it with others or even mixtures of metals."

In addition to making porous materials for catalysis, the researchers said, the technique could be used to create finely structured metals on surfaces, a key to transform the field of plasmonics, which studies the interactions among metal surfaces, light, and density waves of electrons, known as plasmons. Currently, researchers are investigating the use of
'/>"/>

Contact: Lisa-Joy Zgorski
lzgorski@nsf.gov
703-292-8311
National Science Foundation
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. In novel playground, metals are formed into porous nanostructures
2. Tiny refrigerator taking shape to cool future computers
3. ShapeGrabber and Nikon Instruments Inc. Announce Distribution Agreement
4. Foldable and stretchable, silicon circuits conform to many shapes
5. Halogen Customers Shape Industry-Leading Employee Performance and Talent Management Solution
6. Sol-gel inks produce complex shapes with nanoscale features
7. Superbugs, shapes and nanotechnology
8. New TUMS(R) QuikPak(TM) Campaign Offers Innovative Heartburn Relief with a Little Help from the Jetsons
9. The pitter patter of little feet ... climbing straight up a wall
10. BIO-key(R) Awarded Contract to Deploy Incident Reporting System for Littleton, CO Police Department
11. Ventria Receives Friends of Education Award From Geary County School District
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Metals shape up with a little help from friends
(Date:1/14/2014)... Date: Friday, April 11, 2014 , Time: 6 p.m. ... Road, Warrington, Pa. , Details: The Hepatitis B ... a cure for hepatitis B and improving the quality of ... Ball on Friday, April 11 at Warrington Country Club in ...
(Date:1/14/2014)... leading provider of strategic communications services to corporations and organizations preparing ... the United States and Europe , ... returning to the firm,s Washington, D.C. office. ... two years of service as Associate Commissioner for the Office of ...
(Date:1/14/2014)... , Jan. 14, 2014 The largest international ... medicinal plants and therapeutic derivatives thereof has endorsed ... and researchers about the challenges of adulterated herb ... ) The Society for Medicinal ...
(Date:1/14/2014)... In recent years, growing suspicion about the pharmaceutical ... and promotion has led to unprecedented levels of public ... about the insidious impact of commercialization of research, has ... the world’s biggest pharmas for illegal marketing activities, allegations ...
Breaking Biology Technology:Hepatitis B Foundation to Host Annual Crystal Ball Gala 2Former FDA Associate Commissioner Returns To 3D Communications 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 2World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 3World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 4World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 5World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 6World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 7World's Largest Group of Medicinal Plant Researchers Endorses ABC-AHP-NCNPR Botanical Adulterants Program 8The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 2The Sunshine Act: Necessary Regulation or Unnecessary Dysregulation? New Life Science Webinar Hosted by Xtalks and IRB Services 3
... Germany will present itself as one of the,world,s ... BIO,International Convention. Under the "Breakthroughs in Regenerative Medicines,in ... into the,latest research results in the area of ... the regulatory framework conditions will be,introduced in a ...
... Corporation (Nasdaq: MATK ) announced that it intends ... 2009 on June 3, 2009, at approximately 4:00 p.m. Eastern ... Martek will conduct a conference call to discuss these results ... call live via webcast by visiting Martek,s web site at ...
... North Carolina And ChinaRESEARCH TRIANGLE PARK, N.C., May ... Health Sciences has signed an agreement with China ... Institute for International Drug Development. Building on strengths ... development, and education, the Institute will help to ...
Cached Biology Technology:BIO International Convention 2009: Research Location Germany Presents Potential in Regenerative Medicine 2The Hamner Institutes Announce Partnership With China Medical City 2The Hamner Institutes Announce Partnership With China Medical City 3
(Date:4/17/2014)... Researchers in France have hit on a novel ... receive the correct and most effective treatment possible., ... the western and developing world. If left untreated, ... to renal failure and other complications. In many ... problem. Clearly a more effective pathological approach to ...
(Date:4/17/2014)... Indiana University researchers have detected new early-warning signs of ... discovery could have far-reaching implications for the diagnosis and ... over 25 million Americans. , "We had not expected ... such early stages," said Ann Elsner, professor and associate ... author of the study. "We set out to study ...
(Date:4/17/2014)... have uncovered a new way the immune system may ... efforts to use immune cells to treat illness. , ... the immunological equivalent of "neighborhood police" specialized squads ... organ, instead of an entire city, the body. , ... Louis have shown that the liver, skin and uterus ...
Breaking Biology News(10 mins):New technique detects microscopic diabetes-related eye damage 2New technique detects microscopic diabetes-related eye damage 3Some immune cells defend only 1 organ 2
... Barbara, CA The Bren School-based authors of a study ... have observed toxicity to marine organisms resulting from exposure to ... toxic under similar conditions. Lead author and assistant research ... both Bren School professors and lead scientists at the ...
... at the University of California, Riverside discovered a tiny fairyfly wasp ... United States until then. Nearly exactly a year later, he ... is well established in the country. Called Gonatocerus ater ... North America from Europe. It lays its eggs inside the ...
... New Rochelle, NY, January 24, 2012The time for commercial development ... and curable with gene therapy deserve access to the technology, ... Wilson, MD, PhD, Editor-in-Chief of Human Gene Therapy ... . Human Gene Therapy and Human Gene ...
Cached Biology News:Nano form of titanium dioxide can be toxic to marine organisms 2Wasp found in upstate New York shows up in Southern California 2Gene therapy is a 'disruptive science' ready for commercial development 2