Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Using ions to probe ionic liquids

12.09.2003


Scientists at the U.S. Department of Energy’s Brookhaven National Laboratory are using a very small and light ion, the electron, to study the structure and dynamics of ionic liquids and how those properties influence chemical reactivity.



Ionic liquids are made of positive and negative ions that pack so poorly together that they are liquids near room temperature. They offer extremely low volatility, non-flammability, new reactivity patterns, and the formation of separate phases that allow the easy separation of products -- properties that make them safer to work with, easier to recycle, and less likely to pollute the atmosphere than traditional solvents.

Brookhaven chemist James Wishart and postdoctoral research associate Alison Funston use pulsed electron beams to initiate chemical reactions in ionic liquids, causing some of the ions to give up one of their own electrons. The isolated electrons can exist for hundreds of nanoseconds surrounded by solvent. Systematic variation of ionic liquid composition shows that solvated electron absorption spectra depend strongly on the structure of the ionic liquid and on the presence of functional groups such as hydroxyl groups.


While it takes only a few nanoseconds for electrons to become fully equilibrated (solvated) in ionic liquids, that is one thousand times slower than in most conventional solvents. During that time, the pre-solvated electrons are highly susceptible to capture by low concentrations of dissolved compounds. This can result in unanticipated reactivity patterns that have profound implications for uses of ionic liquids in radiation-filled environments such as the nuclear fuel cycle.

Wishart and Funston use electron scavengers to probe this reactivity and they measure ionic liquid solvation dynamics by following the laser-induced fluorescence of dye molecules that are sensitive to their surroundings. Viscosity is a key factor in all this work, and they have designed new, lower-viscosity ionic liquids to aid these studies.

To learn more, see Funston’s poster on Wednesday, Sept. 10, 2003, at 7:30 p.m. (PHYS 372), or hear her talk during the "Ionic Liquids: Progress and Prospects" session on Thursday, Sept. 11, at 2:50 p.m. (IEC 196), both at the Jacob Javits Convention Center. This work was funded by the Division of Chemical Sciences, Office of Basic Energy Sciences at DOE’s Office of Science, and by Brookhaven’s Laboratory Directed Research and Development Program.

Karen McNulty Walsh | EurekAlert!
Further information:
http://www.bnl.gov/

More articles from Power and Electrical Engineering:

nachricht Linear potentiometer LRW2/3 - Maximum precision with many measuring points
17.05.2017 | WayCon Positionsmesstechnik GmbH

nachricht First flat lens for immersion microscope provides alternative to centuries-old technique
17.05.2017 | Harvard John A. Paulson School of Engineering and Applied Sciences

All articles from Power and Electrical Engineering >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

Im Focus: Using graphene to create quantum bits

In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.

In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

Physicists discover mechanism behind granular capillary effect

24.05.2017 | Physics and Astronomy

Measured for the first time: Direction of light waves changed by quantum effect

24.05.2017 | Physics and Astronomy

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>