Center for Nanophase Materials Sciences Archives

Buchanan named deputy for science, technology at ORNL

Posted at 3:33 pm July 20, 2017
By John Huotari Leave a Comment

Michelle Buchanan

Michelle Buchanan, an accomplished scientific leader and researcher, has been appointed deputy for science and technology at the U.S. Department of Energy’s Oak Ridge National Laboratory by new Lab Director Thomas Zacharia, a press release said. Her appointment is effective October 1.

“Dr. Buchanan’s research accomplishments, programmatic expertise, and reputation for achievement support ORNL’s role as a premier research institution that provides scientific expertise and breakthroughs that are critical to national priorities in energy, industry, and national security,” said Zacharia, who served in the deputy’s position until becoming lab director on July 1.

Buchanan has been associate laboratory director for physical sciences since 2004, with responsibilities including the lab’s Chemical Sciences, Physics, and Materials Science and Technology divisions, as well as its Center for Nanophase Materials Sciences, a DOE Office of Science user facility. The lab will conduct an international search for her replacement, the press release said.

As deputy for science and technology, Buchanan’s responsibilities will cover the range of ORNL research—computing and computational sciences, neutron science, nuclear science and engineering, the physical sciences, energy and environmental science, and national security—as well as the lab’s leadership role in U.S. ITER, the Exascale Computing Project, and ORNL research centers and institutes, the press release said. [Read more…]

ORNL cell-free protein synthesis is potential lifesaver

Posted at 10:47 am January 3, 2016
By Oak Ridge National Laboratory Leave a Comment

This section of a serpentine channel reactor shows the parallel reactor and feeder channels separated by a nanoporous membrane. At left is a single nanopore viewed from the side; at right is a diagram of metabolite exchange across the membrane. (Image by ORNL)

Lives of soldiers and others injured in remote locations could be saved with a cell-free protein synthesis system developed at the U.S. Department of Energy’s Oak Ridge National Laboratory.

The device, a creation of a team led by Andrea Timm and Scott Retterer of the lab’s Biosciences Division, uses microfabricated bioreactors to help the on-demand production of therapeutic proteins for medicines and biopharmaceuticals. Making these miniature factories cell-free, which eliminates the maintenance of a living system, simplifies the process and lowers cost.

“With this approach, we can produce more protein faster, making our technology ideal for point-of-care use,” Retterer said. “The fact it’s cell-free reduces the infrastructure needed to produce the protein and opens the possibility of creating proteins when and where you need them, bypassing the challenge of keeping the proteins cold during shipment and storage.” [Read more…]

UT-ORNL breakthrough aims to improve tech gadgets, TVs

Posted at 1:54 pm December 28, 2015
By University of Tennessee Leave a Comment

Ramki Kalyanaraman

Whether at home, work, or play, touchscreen devices have quickly become one of the hallmarks of the modern world.

Phones, tablets, computers, and even televisions use the technology, which relies on substances known as transparent conductive films. All but a small fraction of those films are made from a particular class of oxides that, although they do the job very effectively, contain rare and costly elements.

Now, thanks to a breakthrough led by the University of Tennessee in Knoxville and Oak Ridge National Laboratory, that problem could soon be in the past.

“The electronics industry relies heavily on the use of Indium metal for the many situations requiring the right balance of transparency and current carrying ability,” said UT Professor Ramki Kalyanaraman. “While Indium is scarce, our new material contains elements that are far more abundant such as iron, terbium, and dysprosium.” [Read more…]

Miaofang Chi of ORNL named top scientist at UT-Battelle’s Awards Night

Posted at 10:59 am November 23, 2015
By Oak Ridge National Laboratory Leave a Comment

Miaofang Chi (Photo by ORNL)

Miaofang Chi of the Center for Nanophase Materials Sciences at Oak Ridge National Laboratory has earned the ORNL Director’s Award for Outstanding Individual Accomplishment in Science and Technology.

ORNL Director Thom Mason presented the award to Chi on Friday during the annual Awards Night event in Knoxville hosted by UT-Battelle, the management and operating contractor for ORNL.

Chi was honored for her pioneering early career research in analytical electron microscopy. Chi’s research has advanced the understanding of defect and interface chemistry and structure and how such defects control materials properties at the atomic level. Her work includes the recent development of transformative insitu microscopy methods to probe transport phenomena at the atomic scale.

Chi also earned the Early-Career Researcher Award. [Read more…]

ORNL, Solid Power sign exclusive license for lithium-sulfur battery tech

Posted at 9:15 am November 22, 2015
By Oak Ridge National Laboratory Leave a Comment

ORNL’s Nancy Dudney, center, and former lab researchers Jane Howe and Chengdu Liang were among the developers of lithium-sulfur materials that have been licensed to Solid Power for use in next-generation batteries. (Photo by ORNL)

Oak Ridge National Laboratory and Solid Power Inc. of Louisville, Colorado, have signed an exclusive agreement licensing lithium-sulfur materials for next-generation batteries.

The company licensed a portfolio of ORNL patents relating to lithium-sulfur compositions that will enable development of more energy-dense batteries, a press release said. ORNL’s proof-of-concept battery research has demonstrated the technology’s potential to improve power, operating temperature, manufacturability, and cost as well, the release said.

“We’re thrilled to add the technology developed at ORNL to Solid Power’s portfolio of novel materials and processes built around manufacturing a better battery,” said Douglas Campbell, president and chief executive officer of Solid Power. “The intellectual property ORNL has perfected better positions Solid Power to successfully achieve its mission.” [Read more…]

Helium ‘balloons’ offer new path to control complex materials

Posted at 9:29 am June 30, 2015
By Oak Ridge National Laboratory Leave a Comment

Inserting helium atoms (visualized as a red balloon) into a crystalline film (gold) allowed Oak Ridge National Laboratory researchers to control the material’s elongation in a single direction. (Submitted image)

Researchers at Oak Ridge National Laboratory have developed a new method to manipulate a wide range of materials and their behavior using only a handful of helium ions.

The team’s technique, published in Physical Review Letters, advances the understanding and use of complex oxide materials that boast unusual properties such as superconductivity and colossal magnetoresistance but are notoriously difficult to control.

For the first time, ORNL researchers have discovered a simple way to control the elongation of a crystalline material along a single direction without changing the length along the other directions or damaging the crystalline structure. This is accomplished by adding a few helium ions into a complex oxide material and provides a never before possible level of control over magnetic and electronic properties.

“By putting a little helium into the material, we’re able to control strain along a single axis,” said ORNL’s Zac Ward, who led the team’s study. “This type of control wasn’t possible before, and it allows you to tune material properties with a finesse that we haven’t previously had access to.” [Read more…]

HED: Silica ‘spiky screws’ could enhance industrial coatings, additive manufacturing

Posted at 12:47 am June 26, 2015
By Oak Ridge National Laboratory Leave a Comment

It took marine sponges millions of years to perfect their spike-like structures, but research mimicking these formations may soon alter how industrial coatings and 3-D printed objects are produced.

A molecular process developed by researchers at Oak Ridge National Laboratory paves the way for improved silica structure design by introducing microscopic, segmented screw-like spikes that can more effectively bond materials for commercial use.

The study, conducted by Jaswinder Sharma and his colleagues Panos Datskos and David Cullen, has been published in Angewandte Chemie International Edition. Authors said other applications of the screw-like spikes could include coatings for eyeglasses, television screens, commercial transportation, and even self-cleaning windows and roofs in rural and urban environments.

Created by emulsion droplets applied to a silica particle’s surface, the new, segmented spikes offer an alternative tool for material scientists and engineers that can better maintain and fuse bonds within a variety of microstructures. [Read more…]

ORNL demonstrates first large-scale graphene composite fabrication

Posted at 11:55 am May 19, 2015
By Oak Ridge National Laboratory 1 Comment

ORNL’s ultrastrong graphene features layers of graphene and polymers and is an effective conductor of electricity. (Image courtesy ORNL)

One of the barriers to using graphene at a commercial scale could be overcome using a method demonstrated by researchers at the U.S. Department of Energy’s Oak Ridge National Laboratory.

Graphene, a material stronger and stiffer than carbon fiber, has enormous commercial potential but has been impractical to employ on a large scale, with researchers limited to using small flakes of the material.

Now, using chemical vapor deposition, a team led by ORNL’s Ivan Vlassiouk has fabricated polymer composites containing 2-inch-by-2-inch sheets of the one-atom thick hexagonally arranged carbon atoms.

The findings, reported in the journal Applied Materials & Interfaces, could help usher in a new era in flexible electronics and change the way this reinforcing material is viewed and ultimately used. [Read more…]

ORNL-led team demonstrates desalination with graphene membrane

Posted at 7:25 pm March 30, 2015
By Oak Ridge National Laboratory Leave a Comment

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…]

ORNL’s Kalinin awarded Royal Microscopical Society medal

Posted at 12:03 am March 20, 2015
By Oak Ridge National Laboratory Leave a Comment

With scanning probe microscopy, ORNL’s Sergei Kalinin explores nanoscale phenomena in new materials for energy and data storage to accelerate their discovery, design, and deployment. (Photo courtesy ORNL)

Materials scientist Sergei Kalinin of the U.S. Department of Energy’s Oak Ridge National Laboratory has been awarded the inaugural Medal for Scanning Probe Microscopy, or SPM, by the Royal Microscopical Society, or RMS.

Kalinin is director of ORNL’s Institute for Functional Imaging of Materials, which melds capabilities in imaging, high-performance computing, and materials theory to guide the design of advanced materials for energy applications. He is also a theme leader at the Center for Nanophase Materials Sciences, a DOE Office of Science User Facility at ORNL, and an adjunct associate professor of materials science and engineering at the University of Tennessee in Knoxville. [Read more…]

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

Posted at 10:54 pm January 27, 2015
By Oak Ridge National Laboratory Leave a Comment

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…]

Rubber meets the road with new ORNL carbon, battery technologies

Posted at 9:54 pm August 27, 2014
By Oak Ridge National Laboratory Leave a Comment

ORNL researchers’ goal is to scale up the recovery process and demonstrate applications as anodes for lithium-ion batteries in large-format pouch cells. (Image courtesy ORNL)

Recycled tires could see new life in lithium-ion batteries that provide power to plug-in electric vehicles and store energy produced by wind and solar, say researchers at Oak Ridge National Laboratory.

By modifying the microstructural characteristics of carbon black, a substance recovered from discarded tires, a team led by Parans Paranthaman and Amit Naskar is developing a better anode for lithium-ion batteries. An anode is a negatively charged electrode used as a host for storing lithium during charging.

The method, outlined in a paper published in the journal RSC Advances, has numerous advantages over conventional approaches to making anodes for lithium-ion batteries.

“Using waste tires for products such as energy storage is very attractive not only from the carbon materials recovery perspective but also for controlling environmental hazards caused by waste tire stock piles,” Paranthaman said.

The ORNL technique uses a proprietary pretreatment to recover pyrolytic carbon black material, which is similar to graphite but man-made. When used in anodes of lithium-ion batteries, researchers produced a small, laboratory-scale battery with a reversible capacity that is higher than what is possible with commercial graphite materials. [Read more…]