Navigation Links
Nano sculptures in gold
Date:8/1/2008

eviously it was uncharged particles that would have attracted interest as catalysts - and they sometimes take on a quite different form from those of charged clusters with the same number of atoms.

The Berlin researchers examined clusters with 7, 19 and 20 atoms. In the uncharged clusters with 19 and 20 atoms they observed the same structures that are familiar from their negative counterparts: 20 gold atoms stacked into a tetrahedron, a pyramid with a triangular base. With one atom fewer, the pyramid loses its tip. "Seven uncharged gold atoms form a triangle with an additional vertex," says Andr Fielicke. In a positively charged cluster, on the other hand, seven atoms form a hexagon with one atom in its centre. In uncharged form, there are three gold atoms positioned on each edge of the triangle. On one edge, two atoms are bridged by another, which creates the extra vertex. "Uncharged gold atoms probably prefer this structure as it is easier for the electrons to avoid each other," says Fielicke.

In order to scan the structure of the uncharged nano particles, the scientists in Berlin had to solve several problems at once. "The clusters are rather unstable; you can't just buy them as a powder," explains Philipp Gruene, who carried out a large portion of the experiment. Therefore, the scientists had to create the gold clusters in the same apparatus in which they determine the particle structure. To this end, they use a laser to vaporize small quantities of the precious metal from a gold bar that creates gold clusters in different shapes and sizes. In this confusion of particles, it is not possible to discern any particular structures, which poses the next problem.

Normally, chemists separate a mixture of particles like this in a mass spectrometer. This device first ionizes the particles, which means it provides them with an electrical charge. Then it separates them according to their mass in an electrical field, as the field accelerates light
'/>"/>

Contact: Dr. Andr Fielicke
fielicke@fhi-berlin.mpg.de
49-308-413-5622
Max-Planck-Gesellschaft
Source:Eurekalert  

Page: 1 2 3 4

Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Nano sculptures in gold
(Date:7/30/2014)... (PRWEB) July 30, 2014 Good ... featured in an upcoming episode of Innovations with ... Discovery Channel. Dates and show times TBA. , ... Good Neighbor Community Services’ vision to redefine the ... individualized and dynamic services. Through passion, innovation, determination, ...
(Date:7/30/2014)... Volunteers from the Church of Scientology of Denmark ... with massive distribution of Truth About Drugs ... on Strøget, the famous Copenhagen walking street. Popular ... its ambiance, some quarter of a million people stroll ... , These activities are part of a coordinating effort ...
(Date:7/30/2014)... MA (PRWEB) July 30, 2014 ... of authentication, access management and secure communications solutions ... Imprivata OneSign ® is the most widely selected ... McKesson Paragon or Horizon electronic medical records (EMR) ... increase of about 11 percent in the last ...
(Date:7/30/2014)... (July 30, 2014) The phrase "we caught it early" ... in the midst of a cancer diagnosis. Combating cancer ... to a certain part of the body, gives patients ... breast, skin, colon, prostate and other forms of cancer ... health care providers recommend cancer screenings as a precautionary ...
(Date:7/30/2014)... Atlanta, Georgia (PRWEB) July 30, 2014 ... Business and Technology Alliance of TAG (B&TA), today issued ... 2014 TAG Excalibur Awards. , Interested companies have until ... program after which, Semi-Finalists will be selected by the ... be required to meet with the judges for interviewing ...
Breaking Medicine News(10 mins):Health News:Good Neighbor Community Services to be Featured in an Upcoming Episode of Innovations With Ed Begley, Jr. 2Health News:Imprivata Achieves 51 Percent Single Sign-on Market Share Amongst U.S. Hospitals Using McKesson Paragon or Horizon EMR Systems, According to HIMSS Analytics 2Health News:UK psychologist creates patient tool to assist with lung cancer screening decision 2Health News:UK psychologist creates patient tool to assist with lung cancer screening decision 3Health News:Last Call for TAG 2014 Excalibur Awards Nominations and Applications 2Health News:Last Call for TAG 2014 Excalibur Awards Nominations and Applications 3
... forget: improving memory in Alzheimer disease mice , ... in memory formation, has been linked to Alzheimer disease. ... have now shown that two different drugs that inhibit ... Alzheimer disease (APP/PS1 mice), leading them to suggest drugs ...
... USA, Inc. announced the signing of a Memorandum of Understanding signifying ... Spray, an all natural, capsaicin-based product for fast relief from allergy ... ... Washington, DC, and Newtown, CT (PRWEB) July 1, 2008 -- ...
... Minn., July 1 Howard Epstein, M.D. has ... medical director for commercial,operations and clinical design. In ... supporting case review and clinician consultation for,integrated health ... Design area, serve as a liaison to Blue ...
... The U.S.,Agency for International Development (USAID) awarded a ... HIV/AIDS in Ethiopia. The program will,provide youth access to ... existing care and prevention programs in five,underserved communities in ... build community networks by means of youth-led volunteer services. ...
... NEW YORK (July 1, 2008) -- Women may ... (CV) drug-treatments for enlarged heart, according to NewYork-Presbyterian ... first time, researchers have uncovered that women derive ... high-blood-pressure-lowering drugs -- losartan and atenolol -- for ...
... toll in outbreak reaches 869, probe expands to include ... 1 (HealthDay News) -- With the number of people ... 869, with 107 hospitalizations, U.S. officials acknowledged Tuesday that ... the contaminant. , The U.S. Food and Drug Administration ...
Cached Medicine News:Health News:JCI online early table of contents: July 1, 2008 2Health News:JCI online early table of contents: July 1, 2008 3Health News:JCI online early table of contents: July 1, 2008 4Health News:JCI online early table of contents: July 1, 2008 5Health News:JCI online early table of contents: July 1, 2008 6Health News:SINOL USA, Inc. and Strategic Pharmaceutical Advisors, Inc. to Enter a Marketing Agreement for SINOL Nasal Spray 2Health News:USAID Announces Youth-Focused HIV/AIDS Programs in Ethiopia 2Health News:Gender differences and heart disease 2Health News:U.S. Officials Stymied in Salmonella Search 2Health News:U.S. Officials Stymied in Salmonella Search 3Health News:U.S. Officials Stymied in Salmonella Search 4
(Date:7/30/2014)... LAS VEGAS , July 30, 2014  DigiPath, ... provider that is expanding into the cannabis testing and ... development in its business and affairs not previously disclosed ... for the recent unusual market action. "We ... securities over the last three trading days," said ...
(Date:7/30/2014)... /PRNewswire-iReach/ -- This is a professional and in-depth ... (CAS 9041-08-1) & calcium (CAS 37270-89-6) industry. The ... sodium (CAS 9041-08-1) & calcium (CAS 37270-89-6) including ... then explores global and China,s top manufacturers of ... listing their product specification, capacity, production value, cost, ...
(Date:7/30/2014)... VILLAGE, Nev. , July 30, 2014  PDL ... announced that company management will participate in the Jefferies ... Boston , Massachusetts. The conference will occur on August ... About PDL BioPharma, Inc. PDL BioPharma manages ... of its Queen et al. antibody humanization patents and ...
Breaking Medicine Technology:DigiPath No New Corporate Developments 2Heparin Sodium & Calcium Industry for Global and Chinese Markets Forecast to 2019 2Heparin Sodium & Calcium Industry for Global and Chinese Markets Forecast to 2019 3Heparin Sodium & Calcium Industry for Global and Chinese Markets Forecast to 2019 4Heparin Sodium & Calcium Industry for Global and Chinese Markets Forecast to 2019 5PDL BioPharma to Participate in Jefferies 2014 Boston Healthcare Summit 2
... Oct. 26, 2011 Reportlinker.com ... research report is available in ... Early Stage Drug Safety Strategies ... towards achieving clinical success ...
... Oct. 26, 2011 Reportlinker.com announces ... is available in its catalogue: ... Pharmaceutical R&D: Company strategies, emerging markets ... http://www.reportlinker.com/p0114851/Key-Trends-in-Offshoring-Pharmaceutical-RD-Company-strategies-emerging-markets-and-impact-on-ROI.html#utm_source=prnewswire&utm_medium=pr&utm_campaign=Drug_Discovery_and_Development ...
Cached Medicine Technology:Early Stage Drug Safety Strategies and Risk Management: Maximizing opportunities towards achieving clinical success 2Early Stage Drug Safety Strategies and Risk Management: Maximizing opportunities towards achieving clinical success 3Early Stage Drug Safety Strategies and Risk Management: Maximizing opportunities towards achieving clinical success 4Early Stage Drug Safety Strategies and Risk Management: Maximizing opportunities towards achieving clinical success 5Early Stage Drug Safety Strategies and Risk Management: Maximizing opportunities towards achieving clinical success 6Early Stage Drug Safety Strategies and Risk Management: Maximizing opportunities towards achieving clinical success 7Early Stage Drug Safety Strategies and Risk Management: Maximizing opportunities towards achieving clinical success 8Key Trends in Offshoring Pharmaceutical R&D: Company Strategies, Emerging Markets and Impact on ROI 2Key Trends in Offshoring Pharmaceutical R&D: Company Strategies, Emerging Markets and Impact on ROI 3Key Trends in Offshoring Pharmaceutical R&D: Company Strategies, Emerging Markets and Impact on ROI 4Key Trends in Offshoring Pharmaceutical R&D: Company Strategies, Emerging Markets and Impact on ROI 5Key Trends in Offshoring Pharmaceutical R&D: Company Strategies, Emerging Markets and Impact on ROI 6Key Trends in Offshoring Pharmaceutical R&D: Company Strategies, Emerging Markets and Impact on ROI 7Key Trends in Offshoring Pharmaceutical R&D: Company Strategies, Emerging Markets and Impact on ROI 8Key Trends in Offshoring Pharmaceutical R&D: Company Strategies, Emerging Markets and Impact on ROI 9
... Laboratories is a national reference laboratory and ... and development. ARUP offers an extensive test ... tests in clinical and anatomic pathology. Owned ... clients include more than half of the ...
... national reference laboratory and a worldwide leader ... offers an extensive test menu of highly ... and anatomic pathology. Owned by the University ... than half of the nation's university teaching ...
... is a national reference laboratory and a ... development. ARUP offers an extensive test menu ... in clinical and anatomic pathology. Owned by ... include more than half of the nation's ...
... national reference laboratory and a worldwide leader ... offers an extensive test menu of highly ... and anatomic pathology. Owned by the University ... than half of the nation's university teaching ...
Medicine Products: