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  

0

GOOD

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:5/24/2013)... In a sneak preview of the ... technologies with applications in multiple and diverse areas ... and Photonics symposium in San Diego, California, ... society for optics and photonics , the event ... technology meeting in North America, with approximately 4,500 ...
(Date:5/24/2013)... Israel , May 24, 2013 ... leader in embolic protection stents, announced that Alan ... and Craig Shore , the Company,s Chief ... Investor Conference on Thursday May 30, 2013 at The Pfister ... The format of the conference includes a ...
(Date:5/24/2013)... Texas (PRWEB) May 24, 2013 ... benchmarking survey on kinase profiling carried out in ... details of the breakdown of the responses for ... the future (2015). It also highlights some interesting ... survey groupings. Two bottom-up models were developed to ...
(Date:5/24/2013)... City, OK (PRWEB) May 24, 2013 The ... of casualties. And following its ravage, the mayor of Moore, ... bill for new houses, said a report from cnn.com. Reaching ... the tornado victims complimentary Molderizer and Safe Shield to counter ... to the report published on May 22, 2013, caused 24 ...
Breaking Biology Technology:See What’s in Earth’s Future ? and Out in Space Now ? at SPIE Optics and Photonics 2See What’s in Earth’s Future ? and Out in Space Now ? at SPIE Optics and Photonics 3See What’s in Earth’s Future ? and Out in Space Now ? at SPIE Optics and Photonics 4InspireMD To Participate In Benchmark Investor Conference On May 30th 2InspireMD To Participate In Benchmark Investor Conference On May 30th 3InspireMD To Participate In Benchmark Investor Conference On May 30th 4Kinase Market Profiling - In House & Outsourced Trends 2015 Forecast in New Research Report at ReportsnReports.com 2Kinase Market Profiling - In House & Outsourced Trends 2015 Forecast in New Research Report at ReportsnReports.com 3Kinase Market Profiling - In House & Outsourced Trends 2015 Forecast in New Research Report at ReportsnReports.com 4Mayor of Oklahoma-Tornado-Impaired Town Proposes Storm Shelter Bill, My Cleaning Products Offers Complimentary Molderizer and Safe Shield to Help Victim with Looming Mold 2
... LifeStem,International, Inc., (OTC Bulletin Board: LSTM), formerly CalbaTech, ... products and,platforms to the research market for biotech ... as providing services in the,collection, processing and storage ... first quarter of 2008 ending March 31 totaled ...
... Injuries Believed to be Caused by Contaminated Blood ... thinner Heparin continues to,make headlines as more people ... after using the contaminated drug -- a group ... Friday, May 2, 2008, another lawsuit,was filed against ...
... At their 2008 Annual,Meeting, shareholders of Spherix Incorporated (Nasdaq: SPEX ... -- Douglas T. Brown, Senior VP and Manager of Corporate Banking ... Paul Cox, Jr., Principal, Asset Protection Company -- Claire L. ... Spherix -- Gilbert V. Levin, Ph.D., Director of Science ...
Cached Biology Technology:LifeStem International, Inc. Announces Increased Revenues, Decreased Operating Expenses 2LifeStem International, Inc. Announces Increased Revenues, Decreased Operating Expenses 3Illinois Pharmaceutical Manufacturer Sued for Injuries to Kentucky Resident 2Illinois Pharmaceutical Manufacturer Sued for Injuries to Kentucky Resident 3Spherix Holds Annual Shareholders Meeting 2
(Date:5/23/2013)... which estrogen suppresses lipid synthesis in the liver, UC ... treating certain liver diseases. , With this finding, ... long-held views in the field. Study results appear in ... Signaling . , "The dogma in the steroid receptor ... located in the nucleus respond to steroid hormones by ...
(Date:5/23/2013)... the overall health, development, and academic success of ... ensuring that all students have opportunities to engage ... vigorous or moderate-intensity physical activity, says a new ... estimates suggest that only about half of school-age ... health and development. The report recommends that ...
(Date:5/23/2013)... (May 23, 2013) A new report from ... for helping pupils engage in at least 60 minutes ... day. , No more than half of American youth ... of vigorous or moderate intensity physical activity daily, according ... "Because children are in school for nearly half of ...
Breaking Biology News(10 mins):UCI study reveals new mechanism for estrogen suppression of liver lipid synthesis 2Schools should provide opportunities for 60 minutes of daily physical activity to all students 2Schools should provide opportunities for 60 minutes of daily physical activity to all students 3Schools should provide students with daily physical activity, IOM recommends 2
... A Leicester cancer research project, which receives funding ... is investigating whether an extract from bilberries can ... Professor Andy Gescher, of the University of ... out clinical trials with the commercially produced substance ...
... help reduce the risk of pancreatic cancer, says a ... naturally in apples and onions, has been identified as ... reducing the risk of pancreatic cancer. Although the ... who consumed foods rich in flavonols had a significantly ...
... CLEMSON Energy lost from hot engines could ... captured and converted into electricity via thermoelectric devices, ... in Dallas for the world-renowned NanoTX 07 conference. ... MacDairmid Memorial Nano Energy Summit on challenges in ...
Cached Biology News:Bilberry extract -- can it help prevent certain cancers? 2Bilberry extract -- can it help prevent certain cancers? 3Naturally-occurring apple compounds reduce risk of pancreatic cancer 2Clemson physicist addresses international forum on thermoelectric energy 2
anti-Yan 8B12H9...
...
... the formation of phosphodiester bonds in the ... 3' hydroxyl and 5' phosphate termini. The ... which can be performed in 5 minutes ... for this enzyme. A T4 DNA ...
Porcine Aortic Endothelial Cells (PAOEC) (>500,000 cells)...
Biology Products: