Oak Ridge Today

ORNL demonstrates first large-scale graphene composite fabrication

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ORNL Graphene

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…]

Gooch: Main Street No. 1 priority, gives updates on National Park, reappraisals, airport

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Main Street Oak Ridge Site Plan April 16, 2015

Oak Ridge Mayor Warren Gooch on Tuesday said his number one priority for the community is the successful development of Main Street Oak Ridge, which would redevelop the former Oak Ridge Mall. Pictured above is a cropped picture of the Main Street Oak Ridge site plan as of April 16. A link to a larger PDF version of the plan is included in the story below.

 

Note: Oak Ridge Mayor Warren Gooch gave an update on positive developments and challenges during a talk to the League of Women Voters of Oak Ridge on Tuesday, May 5. Here is a lightly edited version of his remarks, which organized the positive developments and challenges into sections. Gooch was appointed mayor by the seven-member Oak Ridge City Council on November 24. This is his first four-year term on the City Council.

It is a distinct privilege for me to serve as your mayor, but I always preface my remarks by saying that I am not speaking today for Council or for the city manager. I have one vote on Council, but I do consider myself to be the chairman of the board of directors for the city.

In that capacity, as I enter my sixth month of service as mayor, I want to share my thoughts about positive developments in our city, discuss near-term challenges that we face, share the results that I have from the community survey that I have been conducting, and leave time for your questions and comments.

First. My number one priority for our community is the successful development of Main Street Oak Ridge (which would redevelop the former Oak Ridge Mall), and it is moving forward. Last week, Crosland Southeast announced that MDC Development Group of Atlanta will be the hotel developer for the project. MDC is also a major developer in the senior housing industry and 15 months ago opened Canterfield Oak Ridge Assisted Living. It has been very successful and well-received in our community.

I was advised yesterday (Monday, May 4) that the retail leasing component of the Main Street project is moving forward, as are the negotiations with a developer for the multi-family housing component of the Main Street project. Groundbreaking and demolition for Main Street is on schedule to begin by June 30. [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…]

Metal powder manufacturing company investing $313 million in Oak Ridge, adding 620 jobs

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Michael Hargett and Kamran Khoza of CVMR USA

CVMR President Michael Hargett, left, and Kamran Khozan, chairman and chief executive officer, joined local, state, and federal officials on Friday to announce they’re moving company headquarters from Toronto to Oak Ridge, investing $313 million and adding 620 jobs.

 

Note: This story was last updated at 12 a.m.

A company that manufactures high-purity metal powders and super alloys is moving its operations to Oak Ridge from Toronto, Canada, and investing $313 million here and creating 620 jobs, officials said Friday.

CVMR, which has operations in 18 countries, will use the former Theragenics building at Horizon Center in west Oak Ridge for its headquarters and research and development. The company closed on that building, which is on 21 acres, on Friday, but executives declined to disclose the sale price.

The first employee was hired Thursday, said Kamran Khozan, chairman and chief executive officer of CVMR (USA) Incorporated.

The company could expand that 65,000-square-foot building; infrastructure that is already in place allows it to be doubled. The company could put 218 people to work right away in its new headquarters and add 402 high-paying manufacturing jobs later, a state official said.

“I can promise you that this is the start of a wave,” said Randy Boyd, the new commissioner of Tennessee Economic and Community Development. [Read more…]

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

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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 electron microscopy unlocks graphene potential

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Silicon Atoms in Graphene

The atomic resolution Z-contrast images show individual silicon atoms bonded differently in graphene. (Photo by ORNL)

Electron microscopy at the Oak Ridge National Laboratory is providing unprecedented views of the individual atoms in graphene, offering scientists a chance to unlock the material’s full potential for uses from engine combustion to consumer electronics.

Graphene crystals were first isolated in 2004. They are two-dimensional (one-atom in thickness), harder than diamonds and far stronger than steel, providing unprecedented stiffness and electrical and thermal properties. By viewing the atomic and bonding configurations of individual graphene atoms, scientists are able to suggest ways to optimize materials so they are better suited for specific applications.

[Read more…]