Navigation Links
Bright lights of purity
Date:1/31/2012

To the lengthy list of serendipitous discoveries gravity, penicillin, the New World add this: Scientists with the U.S. Department of Energy (DOE)'s Lawrence Berkeley National Laboratory (Berkeley Lab) have discovered why a promising technique for making quantum dots and nanorods has so far been a disappointment. Better still, they've also discovered how to correct the problem.

A team of researchers led by chemist Paul Alivisatos, director of Berkeley Lab, and Prashant Jain, a chemist now with the University of Illinois, has discovered why nanocrystals made from multiple components in solution via the exchange of cations (positive ions) have been poor light emitters. The problem, they found, stems from impurities in the final product. The team also demonstrated that these impurities can be removed through heat.

"By heating these nanocrystals to 100 degrees Celsius, we were able to remove the impurities and increase their luminescence by 400-fold within 30 hours," says Jain, a member of Alivisatos' research group when this work was done. "When the impurities were removed the optoelectronic properties of nanocrystals made through cation-exchange were comparable in quality to dots and nanorods conventionally synthesized."

Says Alivisatos, "With our new findings, the cation-exchange technique really becomes a method that can be widely used to make novel high optoelectronic grade nanocrystals."

Jain is the lead author and Alivisatos the corresponding author of a paper describing this work in the journal Angewandte Chemie titled "Highly Luminescent Nanocrystals From Removal of Impurity Atoms Residual From Ion Exchange Synthesis." Other authors were Brandon Beberwyck, Lam-Kiu Fong and Mark Polking.

Quantum dots and nanorods are light-emitting semiconductor nanocrystals that have a broad range of applications, including bio-imaging, solar energy and display screen technologies. Typically, these nanocrystals are synth
'/>"/>

Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Page: 1 2 3

Related biology technology :

1. Perfect nanotubes shine brightest
2. Discovery of a dark state could mean a brighter future for solar energy
3. Bright Light into the Ear Canal Treats Seasonal Depression Effectively in Two Clinical Trials Presented by Valkee and University of Oulu
4. Dr. Frank Fisher of Stevens selected for Fulbright specialist roster
5. Verenium Receives CLARUS Award at MDB Capitals Bright Lights Conference 2011
6. Verenium to Present at MDB Capital Groups Bright Lights Conference
7. China-Biotics Expands Product Supplied to Bright Dairy
8. Light touch brightens nanotubes
9. Cardium to Present at MDB Capital Groups 2010 Bright Lights Conference
10. Former Congressman Dick Gephardt Brings National Spotlight to Rhode Island with Best and Brightest Forum on Medical Innovation
11. New Jerseys Best and Brightest Minds Discuss Challenges Facing Medical Innovation, Call for Policies to Preserve U.S. Leadership in Research and Development
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Bright lights of purity
(Date:8/22/2014)... how the receptors responsible for contractions in the bladder, ... published today in The FASEB Journal , has ... cycle of all cells in the body. The team ... and its control are weakened in ageing bladders, demonstrating ... ageing. , While currently much is known ...
(Date:8/22/2014)... August 22, 2014 Ophthalmic drug ... interesting and challenging endeavors as the anatomy, physiology ... properties to the foreign substances. Ocular drug delivery ... self medication and minimal use of needles; also ... drugs and provides specific targeting within the ocular ...
(Date:8/22/2014)... The AMA is pleased to share ... Alaska that Alaska Governor Sean Parnell has signed House ... public use of Unmanned Aircraft Systems and the continuation ... 255states that it is, “An Act relating to unmanned ... unmanned aircraft system.” It defines State of Alaska laws ...
(Date:8/21/2014)... LYNBROOK, N.Y. , Aug. 21, 2014 /PRNewswire/ ... a biopharmaceutical company developing first in class collagenase-based ... histolyticum or CCH) in the U.S. and XIAPEX ... statistically significant results from a randomized, double-blind Phase ... of cellulite, or edematous fibrosclerotic panniculopathy. The results ...
Breaking Biology Technology:Treatment for overactive bladder and irritable bowel syndrome advanced through pioneering research 2Ocular Drug Delivery Technologies Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2014 - 2020 2Ocular Drug Delivery Technologies Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2014 - 2020 3Ocular Drug Delivery Technologies Market: Global Industry Analysis, Size, Share, Growth, Trends and Forecast 2014 - 2020 4State of Alaska Signs Unmanned Aircraft Systems Bill 2BioSpecifics Technologies Corp. Announces Positive Data from Phase 2a Study of CCH for Treatment of Cellulite 2BioSpecifics Technologies Corp. Announces Positive Data from Phase 2a Study of CCH for Treatment of Cellulite 3BioSpecifics Technologies Corp. Announces Positive Data from Phase 2a Study of CCH for Treatment of Cellulite 4BioSpecifics Technologies Corp. Announces Positive Data from Phase 2a Study of CCH for Treatment of Cellulite 5
... , , NEW YORK, Sept. ... with Dave Champagne, Vice President and General Manager of Informatics ... Chief Engineer at HUNT Research Center and Biobank, about data ... and challenges at life sciences companies. , ...
... , , BALTIMORE, Sept. 9 ... a company engaged in the development of advanced preclinical platforms and ... present at Rodman & Renshaw,s Eleventh Annual Healthcare Conference taking place ... The company,s Chairman of the Board, Dr. David Sidransky, will present ...
... 9 Oramed Pharmaceticals,Inc. (OTCBB: ORMP.OB), a developer of ... approval from the Institutional Review Board (IRB),to commence human ... was,granted after successful pre-clinical results were reported. The trials ... Center in,Jerusalem. , Currently, all ...
Cached Biology Technology:Don't Wait to Innovate: Future Pharmaceuticals Magazine Releases Its Issue on Innovation in IT, Cell-Based Therapy and Supply Chains 2Champions Biotechnology to Present at Rodman & Renshaw's Eleventh Annual Healthcare Conference 2Champions Biotechnology to Present at Rodman & Renshaw's Eleventh Annual Healthcare Conference 3Oramed Pharmaceuticals Commences Human Clinical Trials of an Oral GLP-1 Analog 2Oramed Pharmaceuticals Commences Human Clinical Trials of an Oral GLP-1 Analog 3
(Date:8/22/2014)... Access to Research Careers) Program has announced the travel ... Practical Exercises Workshop which will be held on the ... 2014. These awards are meant to help support ... groups in the the FASEB Grant Writing Seminar & ... awards totaling $20,350. , The FASEB MARC Program is ...
(Date:8/22/2014)... Green tea polyphenols are strong antioxidants and ... protect spinal cord neurons against oxidative stress? ... Affiliated Hospital of Liaoning Medical University, China ... oxidative stress and inhibit neuronal apoptosis, indicating ... in spinal cord neurons under oxidative stress. ...
(Date:8/21/2014)... in smog-producing toxins in past decade, GTA still ... shows that while the Greater Toronto Area (GTA) ... contribute to smog, the city continues to violate ... which can cause or aggravate health problems such ... by a set of complex photochemical reactions involving ...
Breaking Biology News(10 mins):Despite a significant reduction in smog-producing toxins, the Greater Toronto Area still violates Canada's standards for ozone air pollution 2
... reconstructions of atmospheric CO2 concentrations and sea level over ... National Oceanography Centre, Southampton have found that greenhouse gas ... million) were systematically associated with sea levels at least ... determined the ,natural equilibrium, sea level for CO2 concentrations ...
... learn that plants grow toward the light. This seems straightforward, ... to grow and move in response to their environment are ... most fundamental processes in plant biologyplant movement in response to ... American Journal of Botany . Plant movements, known ...
... have cast doubt on the widely held perception that ... Blooms, or proliferations, of jellyfish can show a substantial, ... fishermen, stinging waters for tourists, even choked cooling intake ... have created a perception that the world,s oceans are ...
Cached Biology News:New study documents the natural relationship between CO2 concentrations and sea level 2Scientists join forces to bring plant movement to light 2Scientists join forces to bring plant movement to light 3Scientists join forces to bring plant movement to light 4Jellyfish experts show increased blooms are a consequence of periodic global fluctuations 2
Gap junction protein, beta 2, 26kDa (connexin 26) Antigen: Peptide...
IKKbeta/IKK-2 Polyclonal Antibody 100 ug affinity purified rabbit polyclonal antibody. Reacts with human. Tested in Western blotting....
...
Request Info...
Biology Products: