Oak Ridge Today

Four ORNL researchers elected fellows of American Physical Society

Posted at
By Leave a Comment

Jaime Fernandez-Baca

Jaime Fernandez-Baca (Photo courtesy ORNL)

Four researchers from Oak Ridge National Laboratory have been elected fellows of the American Physical Society, one of the nation’s top professional organizations for scientists.

Jaime Fernandez-Baca, Sergei Kalinin, Mark Lumsden, and Thomas Maier were selected for the honor by the APS Council of Representatives. They will be formally recognized at the APS’s March meeting.

Fernandez-Baca, a distinguished research staff member in the Quantum Condensed Matter Division in ORNL’s Neutron Science Directorate, was recognized by the APS Division of Materials Physics “for seminal neutron scattering studies of magnetic materials, especially the spin and lattice dynamics of colossal magnetoresistive manganites.”

Fernandez-Baca’s research is performed mainly at ORNL’s High Flux Isotope Reactor, where he is the lead for the Triple Axis Spectroscopy group. His expertise is in the study of the magnetic ordering and spin dynamics of complex oxides and related alloys using neutron scattering techniques.

He was the recipient of the International Atomic Energy Agency fellowship, the DOE Office of Science Outstanding Mentor Award (2008), and the Neutron Scattering Society of America Distinguished Service Award (2014). [Read more…]

Materials science duo advances next wave of alloys; work conducted at ORNL, UT

Posted at
By Leave a Comment

Louis Santodonato

Louis Santodonato

Peter Liaw

Peter Liaw

KNOXVILLE—High-entropy alloys—substances constructed with equivalent quantities of five or more metals—might hold the key to future manufacturing and construction, and two researchers from the University of Tennessee in Knoxville could help pave the way.

Doctoral candidate Louis Santodonato, along with his adviser Professor Peter Liaw, both in materials science, did an extensive study into this class of materials, which are considerably lighter and less prone to fracture, corrosion, and oxidation than conventional alloys.

The pair used various methods to observe and model the atomic mixing behavior of high-entropy alloys, work that was picked up by the prestigious journal Nature Communications. [Read more…]

Science: ORNL researchers tune friction in ionic solids at the nanoscale

Posted at
By Leave a Comment

Friction Release

Researchers used electricity and water to control friction levels on ionic surfaces at the nanoscale. As water forms around the nanoscale electrode, it allows for further penetration into the sample surface, thereby increasing or decreasing friction. (Image courtesy ORNL)

Friction impacts motion, hence the need to control friction forces. Currently, this is accomplished by mechanistic means or lubrication, but experiments conducted by researchers at the U.S. Department of Energy’s Oak Ridge National Laboratory have uncovered a way of controlling friction on ionic surfaces at the nanoscale using electrical stimulation and ambient water vapor.

The research, which demonstrates a new physical effect, was undertaken at the Center for Nanophase Materials Sciences, a DOE Office of Science User Facility at ORNL, and is published in the journal Scientific Reports.

“Our finding can have a significant technological impact on applications for both macroscopic and nanoscale devices,” said lead author Evgheni Strelcov. “Decreasing or increasing nanoscale friction at will and thus controlling mechanical energy losses and wear of a microelectromechanical system’s parts has enormous implications for applied energy research and opens a new vista for fundamental science studies.” [Read more…]

Local cycling community riding this weekend in honor of Biegalski

Posted at
By Leave a Comment

Michael Biegalski Memorial Road Ride

A memorial road ride honoring Michael Biegalski, an avid athlete and Oak Ridge National Laboratory researcher, started Sunday morning near Whippoorwill Drive and Wisconsin Avenue.

 

Michael Biegalski

Michael Biegalski was an avid athlete and a research and development staff member at the Center for Nanophase Materials Science at Oak Ridge National Laboratory. (Photo courtesy ORNL)

The local cycling community is having memorial rides this weekend in honor of Michael Biegalski, an avid athlete and Oak Ridge National Laboratory researcher who recently died in a tragic mountain biking accident at Haw Ridge.

On Saturday, top athletes from the community rode the North Boundary and Black Oak Ridge trails.

On Sunday, they’re riding the My Larry/Brushy Mountain “prison loop.” It’s a road ride. Like Saturday’s ride, it will depart from the Westwood neighborhood.

The rides are in memory of Michael, who competed in road, mountain, and cyclocross racing and was passionate about big climbs and endurance riding, Amy Biegalski said. [Read more…]

Man killed in Haw Ridge accident was skilled biker, valuable ORNL researcher

Posted at
By Leave a Comment

Michael Biegalski

Michael Biegalski (Photo courtesy ORNL)

Note: This story was last updated at 12:45 p.m. Dec. 23.

The 38-year-old Oak Ridge man who died in what appears to be an accident while mountain biking on Haw Ridge on Saturday is being remembered as a skilled biker and valuable researcher at Oak Ridge National Laboratory.

Michael David Biegalski, who was born in Silver Spring, Maryland, had been a research and development staff member at the Center for Nanophase Materials Science at Oak Ridge National Laboratory since 2008 and had worked there from 2006 to 2008 as a postdoctoral research associate.

“He was an incredibly valuable person to the center,” CNMS Director Hans Christen said Monday. “A friend of everybody, extremely helpful.”

Other mountain bikers described Biegalski, who was married with two young daughters, as very skilled, and Christen said he was very competitive and raced. [Read more…]

Oak Ridge man dies in apparent biking accident on Haw Ridge

Posted at
By Leave a Comment

Michael Biegalski

Michael Biegalski (Photo courtesy ORNL)

Note: This story was last updated at 12:45 p.m. Dec. 23.

An Oak Ridge man died in what appears to be a tragic mountain biking accident at Haw Ridge on Saturday, authorities said.

Two hikers found the body of Michael Biegalski, 38, near a hiking trail at Haw Ridge at about 4:34 p.m. Saturday, Oak Ridge Police Chief Jim Akagi said.

The hikers met Oak Ridge Police Department officers at a trailhead, and they guided officers to the body, which was about 300 yards from Old Edgemoor Road. The officers confirmed that Biegalski was deceased, and they called the coroner and criminal investigations division to process the area around the accident, Akagi said. The Oak Ridge Fire Department also responded and helped transport the body. [Read more…]

ORNL researchers Buchanan, Liang, Mayes named AAAS fellows

Posted at
By Leave a Comment

ORNL AAAS Fellows 2014

New fellows of the American Association for the Advancement of Science from Oak Ridge National Laboratory are, from left, Michelle Buchanan, Liyuan Liang, and Melanie Mayes. (Photo courtesy ORNL)

 

Three staff members at Oak Ridge National Laboratory have been named fellows of the American Association for the Advancement of Science for scientific contributions that range from administrative leadership to discoveries in the environmental sciences.

Michelle Buchanan, Liyuan Liang, and Melanie Mayes and are among those to receive this year’s recognition to AAAS members by their peers. AAAS is the world’s largest general scientific society and elects fellows based on their distinguished contributions to the advancement of science or its applications, a press release said.

Buchanan is ORNL’s associate laboratory director for physical sciences, where she guides the Chemical Sciences, Materials Science, and Technology and Physics divisions, as well as the Center for Nanophase Materials Science.

She was elected “for exceptional technical leadership and service in the chemical and physical sciences, and for contributions to setting the nation’s research priorities.” [Read more…]

Anasys licenses ORNL nanoscale mass spectrometry imaging technology

Posted at
By Leave a Comment

Heated Atomic Force Microscope Cantilever Probe

A heated atomic force microscope cantilever probe touches a surface to be analyzed with vapor from surface material that is thermally desorbed. The heat is drawn into the ion source of the mass spectrometer, ionized, and then detected and analyzed by a mass spectrometer. (Submitted photo)

Anasys Instruments Corp. has licensed an Oak Ridge National Laboratory technology that allows for simultaneous chemical and physical characterization and could lead to advances in  materials and drug development.

The technique, which combines the power of atomic force microscopy and mass spectrometry, fills a void and streamlines analytical processes that are vital to science and industry, said Roshan Shetty, chief executive officer of Anasys Instruments. He also noted that the technology improves the current spatial resolution of ambient methods for mass spectrometry imaging by a factor of more than 100, resulting in imaging resolution as small as 250 nanometers, or 1/400th the thickness of a human hair.

“This capability could have a tremendous impact on a broad field of applications in materials and life sciences ranging from single-cell imaging to polymer composites,” Shetty said. [Read more…]

ORNL-UT researchers invent ‘sideways’ approach to 2-D hybrid materials

Posted at
By Leave a Comment

heterostructure-anping

ORNL and UT researchers have invented a method to merge different 2-dimensional materials into a seamless layer. This colorized scanning tunneling microscope image shows a single-atom sheet composed of graphene (seen in blue) combined with hexagonal boron nitride (seen in yellow).

Researchers at Oak Ridge National Laboratory and the University of Tennessee in Knoxville have pioneered a new technique for forming a two-dimensional, single-atom sheet of two different materials with a seamless boundary.

The study, published in the journal Science, could enable the use of new types of 2-D hybrid materials in technological applications and fundamental research.

By rethinking a traditional method of growing materials, the researchers combined two compounds—graphene and boron nitride—into a single layer only one atom thick. Graphene, which consists of carbon atoms arranged in hexagonal, honeycomb-like rings, has attracted waves of attention because of its high strength and electronic properties. [Read more…]

ORNL-grown oxygen ‘sponge’ presents path to better catalysts, energy materials

Posted at
By Leave a Comment

ORNL Oxygen Sponge

This schematic depicts a new ORNL-developed material that can easily absorb or shed oxygen atoms. (Photo courtesy ORNL)

Scientists at Oak Ridge National Laboratory have developed a new oxygen “sponge” that can easily absorb or shed oxygen atoms at low temperatures. Materials with these novel characteristics would be useful in devices such as rechargeable batteries, sensors, gas converters, and fuel cells.

Materials containing atoms that can switch back and forth between multiple oxidation states are technologically important but very rare in nature, said ORNL’s Ho Nyung Lee, who led the international research team that published its findings in Nature Materials. [Read more…]