Oak Ridge Today

Oak Ridge students compete in Southern Appalachian Science, Engineering Fair

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Ryan Armstrong earned second place for his project titled “Quantifying the Evolution of Gas from Li-ion Battery Materials” under the mentorship of Gabriel Veith of Oak Ridge National Laboratory. Along with a $750 scholarship and trophy, Ryan will travel to Los Angeles, California in May to compete at the International Science and Engineering Fair. (Submitted photo)

Ryan Armstrong earned second place for his project titled “Quantifying the Evolution of Gas from Li-ion Battery Materials” under the mentorship of Gabriel Veith of Oak Ridge National Laboratory. Along with a $750 scholarship and trophy, Ryan will travel to Los Angeles, California, in May to compete at the International Science and Engineering Fair. (Submitted photo)

 

Seven research students from Oak Ridge High School competed in the 66th Annual Southern Appalachian Science and Engineering Fair hosted at the University of Tennessee. The competition was held March 27-30 with the awards ceremony on Thursday evening. There were 55 Senior Division projects in competition, a press release said.

Five of the students were part of the Math, Science, and Computer Science Thesis course at ORHS that is advised by Tammy Carneim and Jessica Williams. The remaining two did their research independently with the help of teachers Deni Sobek and Sharon Thomas.

Ryan Armstrong earned second place for his project titled “Quantifying the Evolution of Gas from Li-ion Battery Materials” under the mentorship of Gabriel Veith of Oak Ridge National Laboratory. Along with a $750 scholarship and trophy, Armstrong will travel to Los Angeles, California, in May to compete at the International Science and Engineering Fair.

Jasleen Narula earned fourth place and $100 for her project titled “Rapid High-Throughput Toxicity Screening of East Tennessee Water Samples Using Autobioluminescent Yeast Assay” under the mentorship of Steven Ripp. [Read more…]

ORNL technique could set new course for extracting uranium from seawater

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ORNL-TOC-Graphic

Using high-energy X-rays, researchers discovered uranium is bound by adsorbent fibers in an unanticipated fashion. (Image by ORNL)

 

An ultra-high-resolution technique used for the first time to study polymer fibers that trap uranium in seawater may cause researchers to rethink the best methods to harvest this potential fuel for nuclear reactors.

The work of a team led by Carter Abney, a Wigner Fellow at the U.S. Department of Energy’s Oak Ridge National Laboratory, shows that the polymeric adsorbent materials that bind uranium behave nothing like scientists had believed. The results, gained through collaboration with the University of Chicago and detailed in a paper published in Energy and Environmental Science, highlight data made possible with X-ray Absorption Fine Structure spectroscopy performed at the Advanced Photon Source. The APS is a DOE Office of Science User Facility at Argonne National Laboratory.

“Despite the low concentration of uranium and the presence of many other metals extracted from seawater, we were able to investigate the local atomic environment around uranium and better understand how it is bound by the polymer fibers,” Abney said. [Read more…]

ORNL-led team demonstrates desalination with graphene membrane

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Nature Nanotech Pores

Researchers created nanopores in graphene (red, and enlarged in the circle to highlight its honeycomb structure) that are stabilized with silicon atoms (yellow) and showed their porous membrane could desalinate seawater. Orange represents a non-graphene residual polymer. (Source: Oak Ridge National Laboratory, U.S. Department of Energy)

 

By Dawn Levy

Less than 1 percent of Earth’s water is drinkable. Removing salt and other minerals from our biggest available source of water—seawater—may help satisfy a growing global population thirsty for fresh water for drinking, farming, transportation, heating, cooling, and industry. But desalination is an energy-intensive process, which concerns those wanting to expand its application.

Now, a team of experimentalists led by the U.S. Department of Energy’s Oak Ridge National Laboratory has demonstrated an energy-efficient desalination technology that uses a porous membrane made of strong, slim graphene—a carbon honeycomb one atom thick. The results are published in the March 23 advance online issue of Nature Nanotechnology.

“Our work is a proof of principle that demonstrates how you can desalinate saltwater using free-standing, porous graphene,” said Shannon Mark Mahurin of ORNL’s Chemical Sciences Division, who co-led the study with Ivan Vlassiouk in ORNL’s Energy and Transportation Science Division.

“It’s a huge advance,” said Vlassiouk, pointing out a wealth of water travels through the porous graphene membrane. “The flux through the current graphene membranes was at least an order of magnitude higher than (that through) state-of-the-art reverse osmosis polymeric membranes.” [Read more…]