At the 232nd national meeting of the American Chemical Society in San Francisco, Brookhaven Lab chemist James Wishart will present his research on how ionic liquids containing the element boron react with radiation. His talk will be given at the Grand Hyatt Hotel’s Dolores Room on Monday, September 11, at 3:20 p.m. Pacific Time.
Ionic liquids, which contain only electrically charged molecules known as ions, have several properties that make them attractive as an alternative medium for nuclear fuel reprocessing. These include low volatility, low combustibility, and resistance to being electrochemically oxidized or reduced. In 2001, researchers at DOE’s Los Alamos National Laboratory calculated that reprocessing plutonium in boron-containing ionic liquids could substantially reduce the risk of nuclear accidents that involve unintended chain reactions. A particular isotope of boron can “poison” a chain reaction by strongly absorbing the neutrons that propagate the chain.
“Compared to current aqueous systems used for reprocessing plutonium, boron-containing ionic liquids can hold up to a hundred times more dissolved plutonium before reaching the critical threshold – that is, before the plutonium sustains a nuclear chain reaction,” Wishart said. “Thus, there would be far less chance of an accident.”
There are several ways to include boron in ionic liquids. One direct way is to make ionic liquids using negatively charged ions, called anions, that contain boron. This method may not produce a liquid with the melting point or viscosity needed. Another way is to add a material containing a lot of boron – for example, carborane – to an ionic liquid with the desired melting point, viscosity and other properties.
Brookhaven’s Wishart and former postdoctoral researchers Tomasz Szreder and Alison Funston, with collaborators from the University of California, Riverside, have investigated the radiation chemistry of ionic liquids prepared from carborane and a boron-containing anion. They found that electrons ejected from molecules by radiation leads to decomposition of the carborane. To prevent this decomposition, the researchers propose including positively charged ions, like pyridinium, that can intercept the electrons before they react with the carborane. The reactions are reversible so the materials can be used over and over again.
“In U.S. nuclear power reactors, the fuel is only used once-through and a lot of energy remains in the spent fuel that is destined for disposal,” Wishart said. “In the future, we may instead reprocess fuel to use in current reactors and in a new type of reactor now under development. We would extract more energy from the same amount of natural resources and produce less nuclear waste. Advanced reprocessing would also reduce long-lived radioactive waste. The ionic liquids that we study could be a better medium for reprocessing nuclear fuel and nuclear waste than the currently used media.”
DOE’s Office of Basic Energy Sciences within the Office of Science and Brookhaven’s Laboratory Directed Research and Development Program funded this research.
Kay Cordtz | EurekAlert!
Symbiotic bacteria: from hitchhiker to beetle bodyguard
28.04.2017 | Johannes Gutenberg-Universität Mainz
Nose2Brain – Better Therapy for Multiple Sclerosis
28.04.2017 | Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik IGB
More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...
Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...
The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...
The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...
Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
28.04.2017 | Event News
20.04.2017 | Event News
18.04.2017 | Event News
28.04.2017 | Medical Engineering
28.04.2017 | Earth Sciences
28.04.2017 | Life Sciences