- Number 399 |
- October 14, 2013
-
Analyzing the chemical composition of uranium samples
A team of researchers at DOE's Lawrence Livermore National Laboratory (LLNL) has pioneered the use of a long-standing technology for a new application — analyzing the chemical composition of uranium samples.
In a paper published as the cover story in the September edition of Applied Spectroscopy, the Laboratory scientists describe the first reported use of near-infrared spectrometry to study the chemical properties of uranium ore concentrates (UOC), also called yellowcake.
Near-infrared spectrometers were first used in industrial applications in the 1950s and have been utilized for medical diagnostics, combustion research, pharmaceuticals and other uses, but not for studying uranium ore concentrates. The instrument measures the color, intensity and wavelength of light or reflected light. -
Sorbents capturing CO2 will make power plants cleaner
When coal is used to generate electricity in power plants, carbon from the coal bonds with oxygen from air to make carbon dioxide (CO2). Due to concerns about how CO2 impacts global climate, scientists at DOE's National Energy Technology Laboratory are developing materials and processes to separate and capture it from power plants for permanent disposal. Ideally, the capture process will not create new waste materials, is quick and efficient, and the CO2 ends up as a high-pressure gas that can be transported in a pipeline to be injected into an oil field or a deep geologic formation.
Researchers at NETL are developing chemicals called sorbents that absorb carbon dioxide after it is created in power plants. Some sorbents react with the CO2 to create solid materials; these solids can be easily separated from gases in the power plant. Once separated, the solid is chemically broken down into CO2 gas and the original sorbent chemical is recovered, and thus re-used to capture more CO2. Good sorbents have a high CO2 capture capacity and react relatively rapidly with CO2 at temperatures close to those in the power plant. Reversing the reaction to regenerate the sorbent and release the CO2 must also be efficient and the conditions cannot be too extreme.
-
Together at last: PPPL binds the heart of the NSTX-U into a complete whole
After some 18 months of painstaking preparation, a team of engineers and technicians has bound all 36 magnetic field conductors for the center stack of the National Spherical Torus Experiment Upgrade (NSTX-U) into a unified whole. Team members lifted the lid of the mold for the latest crucial stage of the process and found that the task of combining all four quadrants of 20-foot-long conductors into one nearly 20,000-pound cylindrical bundle had gone smoothly as planned.
The bundle lies at the heart of the upgrade, which will double the power of the NSTX-U when the overhaul is completed in fall, 2014. The increased power will enable PPPL scientists to investigate the behavior of plasma, the hot, electrically charged gas that fuels fusion reactions, under higher temperature and magnetic field conditions, and for longer periods of time, than previously had been possible. -
3D dynamic imaging of soft materials
In a new study led by DOE's Berkeley Lab, transmission electron microscopy (TEM) and a unique graphene liquid cell were used to record three-dimensional motions of DNA connected to gold nanocrystals. This is the first reported use of TEM for 3D dynamic imaging of so-called “soft materials,” a category that includes DNA, proteins and other biological compounds, plastics, therapeutic drugs, flexible electronics, and certain types of photovoltaics.