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NSF/MRSEC Program Nugget Liquid Nanoparticles Nanoparticles of many materials have been prepared in the laboratory and all are very fine powders in pure form. We have discovered that nano-particles below a certain size can be transformed into pure liquids by attaching the right molecules to the surface of each particle. The addition of a second, normally liquid substance like water or alcohol is not needed. The nano-liquids will enable new applications of nano-particles to materials technologies. For example, these liquids could be blended with polymers to change the mechanical or optical properties of the polymer. Furthermore, nanoparticles in liquid form can be deposited as more uniform films or coatings than is possible by the current practice that uses suspensions of nanoparticles in water or, more frequently, organic solvents. Since the melting temperature can be readily controlled by changing the molecules on the surface, films can be deposited while hot and then solidified on cooling. Alternatively, the liquid films can be solidified by cross-linking the molecules by ultraviolet irradiation. The elimination of organic solvents in such processes will enable “green” nano-manufacturing processes. Release April 2004. Sogah, Giannelis For more details, visit the Cornell Center for Materials Research website at: http://www.ccmr.cornell.edu/news 1 NSF/MRSEC Program Nugget Molecular Transistors Molecular devices might enable the manipulation of single electrons on the smallest possible device length scales. A cross disciplinary group at Cornell has demonstrated for the first time a transistor device that reaches the ultimate limit in which an electron hops on and off a single atom between two contacts. This has been achieved by nanofabricating gold (Au) electrodes separated by a very narrow gap. A single molecule containing a cobalt atom in a well-defined and deliberately designed bonding configuration is then incorporated into the gap. The electrical characteristics of the transistor can be varied systematically by making chemical changes to the molecule. This work represents two significant steps forward in the field of molecular electronics: the ability to design the electronic states of a molecular device using chemical techniques, and the ability to measure the properties of individual molecules. Release April 2002. Abruna, McEuen, Ralph For more details, visit the Cornell Center for Materials Research website at: http://www.ccmr.cornell.edu/news 2