Project Aims to Create New Materials, Nanodevices

A Multi-University Research Initiative (MURI) grant of as much as $7.5 million has been awarded to a four-university project that aims to use ionic liquids to develop electromechanical devices and high-performance membranes that could help power fuel cells and "smart" clothes.

The Army Research Office awarded the MURI grant to scientists from Virginia Polytechnic Institute and State University (Virginia Tech), the University of Pennsylvania, Pennsylvania State University, and Drexel University. Virginia Tech chemistry professor Tim Long and University of Pennsylvania professor of materials science and engineering Karen I. Winey are codirectors of the Ionic Liquids in Electro-Active Devices (ILEAD) MURI. Long is principal investigator.

Chemistry professor Tim Long of Virginia Polytechnic Institute and State University (Virginia Tech) is principal investigator and codirector of the Ionic Liquids in Electro-Active Devices (ILEAD) MURI, a multi-university research initiative funded by the Army Research Office. The four-university initiative hopes to develop electromechanical devices and high-performance membranes using ionic liquids. (Photo courtesy Virginia Tech)

Ionic liquids (ILs) are relatively large organic salts that offer charge and liquidity at room temperature. Some ILs are touted as safe, environmentally-friendly solvents. They are also useful in electrically conductive membranes, thermally stable at high temperatures, and do not evaporate at normal conditions. With today’s advanced ability to manipulate molecular structure and design unique molecules, ILs’ advantages are being explored for emerging applications.

"The Army needs a myriad of electronic devices that take advantage of the potential synergy of these unique properties," Long said.

The team is creating synthetic ILs and evaluating their performance in sophisticated electronic devices. "Our challenge is to synthesize high performance materials with a particular device in mind. Then the device is truly created from the molecular-scale up," said Long.

The group will integrate ILs into membranes to create thin films to perform various functions, such as membranes that can transport or filter small molecules. "Applications include fuel cell membranes, where protons are transported across a membrane to create electricity. One advantage over existing fuel cell materials is that the IL will not evaporate, so future membranes will operate at higher temperatures with higher efficiency," he said.

Another application could be stimuli-responsive materials for microsensors and "smart" clothes, said Long. "The material would breathe and wick moisture away, but quickly close up in response to a chemical or biological threat. Such a suit could be used by the military, by a firefighter, or in an operating room."

Membranes can also be created that will bend, stretch, or change shape in response to a low voltage, like an artificial muscle.

And ILs can be used in coatings or as part of structures. The team will look at creating new polymeric materials that can be charged or conductive, Long said. "ILs will serve as the building blocks for elastomers, fibers, and rigid plastics for such uses as protective gear and multilayer assemblies," Long said. "We are recharging a field that has been around for a couple of decades because now we are challenged with applications that require IL performance."

The MURI is charged to provide fundamental enabling science for future Army technologies. Senior researchers will focus in three areas. Long and Virginia Tech chemistry professor Harry W. Gibson will work on synthesis of ILs and charged polymers. Winey and Penn State professor of materials science and engineering Ralph H. Colby will do mechanical, electrical, and morphological characterization. Yossef Elabd, professor of chemical and biological engineering at Drexel University; Virginia Tech physics professor Randy Heflin; and Qiming Zhang, distinguished professor of electrical engineering at Penn State, will research performance of actuators, electro-optical devices, and membranes.

Industrial collaborators include DuPont, IBM Almaden, Kraton Polymers, NexGen Aeronautics, BASF, and Discover Technologies. "The industrial collaborators will validate related commercial interests, provide cost-effective manufacturing scenarios, and facilitate technology transfer for military technologies," said Long.

The ILEAD MURI will be administered through the Macromolecules and Interfaces Institute (MII) at Virginia Tech. For more information, visit: www.mii.vt.edu