Navigation Links
Ceramic, heal thyself
Date:4/18/2008

RICHLAND, Wash. A new computer simulation has revealed a self-healing behavior in a common ceramic that may lead to development of radiation-resistant materials for nuclear power plants and waste storage.

Researchers at the Department of Energy's Pacific Northwest National Laboratory found that the restless movement of oxygen atoms heals radiation-induced damage in the engineered ceramic yttria-stabilized zirconia.

Scientists Ram Devanathan and Bill Weber modeled how well that ceramic and other materials stand up to radiation. "If you want a material to withstand radiation over millennia, you can't expect it to just sit there and take it. There must be a mechanism for self-healing," said Devanathan.

"This research raises the possibility of engineering mobile defects in ceramics to enhance radiation tolerance," Weber said. He noted that materials capable of handling high-radiation doses also "could improve the durability of key equipment and reduce the costs of replacements."

The researchers approached their investigation in three steps. First, they analyzed yttria-stabilized zirconia, a compound of yttrium and zirconium oxides that contains random structural defects called "vacancies." The defects occur because yttrium has a smaller electrical charge than zirconium. To correct the charge imbalance, zirconia gives up oxygen atoms. But the loss of these oxygen atoms leaves empty oxygen sites. The remaining oxygen atoms constantly jump in and out of those sites.

"It is like a classroom full of fidgety kids," said Devanathan. "When the teacher turns her back, the kids constantly jump into empty chairs, leaving their own chairs vacant until another kid leaps into the seat."

Next, the scientists simulated an atom undergoing alpha decay. An alpha particle shoots out of the atomic nucleus with such force that the remainder of the atom recoils in the opposite direction. The recoiling atom can cause significant
'/>"/>

Contact: Judith Graybeal
graybeal@pnl.gov
509-375-4351
DOE/Pacific Northwest National Laboratory
Source:Eurekalert

Page: 1 2

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/11/2014)... Researchers from Salk Institute for Biological Studies, BGI, ... the safety and reliability of the existing targeted ... method, TALEN-HDAdV, which could significantly increased gene-correction efficiency ... study published online in Cell Stell Cell ... cell-based gene therapy. , The combination of stem ...
(Date:7/11/2014)... Researchers from Ume University, Sweden, have explored two ... the reaction sequence leading to the formation of ... been published in the scientific journal Nature ... improving present day synthetic catalysts for water oxidation, ... devices for the direct storage of solar energy ...
(Date:7/11/2014)... of mesenchymal stem cells can stimulate neurogenesis in the ... disease (AD) and improve tissue and function injury under ... on the therapeutic effect of adipose-derived stem cells (ADSCs) ... on oxidative injury and neurogenesis in the brain of ... of Life Sciences, Tsinghua University, China transplanted ADSCs into ...
Breaking Biology News(10 mins):A new genome editing method brings the possibility of gene therapies closer to reality 2Molecular snapshots of oxygen formation in photosynthesis 2
... Ga. Being overweight is a known risk factor for ... Now, a University of Georgia study published in the November ... obesity may also be bad for bone health. Researchers ... and 19 with normal (less than 32 percent) and high ...
... A pasture improvement research program by Dr. Dariusz ... as an alternative to winter wheat pastures. But ... many parts of the nation, said Malinowski, a Texas ... from the Mediterranean Basin of southern Europe and northern ...
... environmental change expected this century. It is likely to ... to environmental migrations and potential conflicts in the areas ... such as Hurricane Katrina in the US, Rafael Reuveny ... role of environmental degradation on population migration, or ecomigration. ...
Cached Biology News:Study suggests link between obesity, poor bone health 2Summer-dormant tall fescue grass shows promise for pasture improvements 2Summer-dormant tall fescue grass shows promise for pasture improvements 3Environmental exodus 2
(Date:7/10/2014)... Angeles, CA (PRWEB) July 10, 2014 ... and Bioanalytical techniques during 18-20 August, 2014 at Double ... critically review the recent developments in Analytical & Bioanalytical ... the globe. , Speaking on this occasion, Dr. Srinubabu ... Analytica Acta conference is a remarkable one in ...
(Date:7/10/2014)... , July 10, 2014  Kainos Capital, a ... brands, today announced that it has acquired the Slim-Fast ... in the business. Terms of the transaction were not ... and meal replacement business that markets ready-to-drink shakes, powders, ... North America and in the ...
(Date:7/10/2014)... of Adelaide research may help in the fight against ... detect tiny quantities of explosives with the use of ... journal Sensors and Actuators B: Chemical , the ... detect explosives in concentrations as low as 6.3 ppm ... only a few minutes. , "Traditionally explosives detection has ...
(Date:7/10/2014)... The lithium-ion batteries that power our laptops and electric ... a single charge with the help of a sponge-like ... to replace the graphite traditionally used in one of ... times the energy storage capacity of graphite. A paper ... was published today in Nature Communications . , ...
Breaking Biology Technology:A Critical Review of Analytical Techniques for Improved Living Standards 2A Critical Review of Analytical Techniques for Improved Living Standards 3A Critical Review of Analytical Techniques for Improved Living Standards 4Kainos Capital Acquires Slim-Fast From Unilever 2Detecting trace amounts of explosives with light 2Silicon sponge improves lithium-ion battery performance 2Silicon sponge improves lithium-ion battery performance 3
... 2011 The Biophysical Society,s 55th Annual Meeting takes ... Center in Baltimore, MD. There, more than 6,500 scientists ... and breakthroughs in technology at every level of biophysics ... environments. The Biophysical Society is the largest ...
... 2011 Everist Genomics, a prognostics company focused on ... recurrence, today announced the positive results of the first ... test.  The study is being conducted by Mayo Validation ... resources from all three Mayo Clinic sites. The study, ...
... MISSISSAUGA, ON, Jan. 20 /PRNewswire/ - YM BioSciences Inc. ... development company advancing a diverse portfolio of promising hematology ... announced that results were reported from a randomized Phase ... its licensees, Daiichi Sankyo Co., Ltd. in Japan and ...
Cached Biology Technology:Biophysical Society to Hold 55th Annual Meeting in Baltimore, Maryland, March 5-9, 2011 2Everist Genomics Announces External Validation of OncoDefender™-CRC Test for Predicting Recurrence Risk for Stage I and II Colorectal Cancer Patients 2Everist Genomics Announces External Validation of OncoDefender™-CRC Test for Predicting Recurrence Risk for Stage I and II Colorectal Cancer Patients 3Everist Genomics Announces External Validation of OncoDefender™-CRC Test for Predicting Recurrence Risk for Stage I and II Colorectal Cancer Patients 4YM BioSciences Announces Data from Nimotuzumab Phase II Gastric Cancer Trial Reported at ASCO GI Symposium 2YM BioSciences Announces Data from Nimotuzumab Phase II Gastric Cancer Trial Reported at ASCO GI Symposium 3YM BioSciences Announces Data from Nimotuzumab Phase II Gastric Cancer Trial Reported at ASCO GI Symposium 4
...
ANTI DIPHTH TOX A SU...
... shaker flask clips, purpose-designed to firmly retain ... clips are equipped with a top retainer ... a bottom retainer spring, and silicon tubing ... glassware. Clips include the required mounting ...
... An immuncapture enzyme-activity assay based on ... captured on monoclonal antibody coated microtiter plate. ... standards, samples or controls, 2nd ... The assay is intended for the determination ...
Biology Products: