April 11, 2005
FRONTIERS IN MATERIALS SCIENCEDr. Arun Majumdar
VINSE COLLOQUIUM SERIES
Department of Mechanical Engineering, University of California
Materials Science Division, Lawrence Berkeley National Laboratory
"Thermal and Fluidic Transport in Nanostructured Materials and Devices"
Abstract. When solids and fluids are confined to length scales smaller than 100 nm, one encounters transitions in many aspects of their behavior. This is because there are several characteristic length scales related to their behavior that fall in this length scale regime. In the first part of my talk, I will concentrate on the fundamental length scales related to intermolecular and surface forces in liquids and liquid-solid interfaces. When the size of fluidic structures cross one of the fundamental length scales, new phenomena can be observed and exploited. In my talk, I will focus on transport of ions and biomolecules in nanofluidic structures and devices, and demonstrate new ways of manipulating them that cannot be achieved in microfluidic ones. In the second part of the talk, I will focus on solids: in particular, on how heat conduction can be different at length scales smaller than 100 nm. It will be apparent that in this regime, size is a tuning parameter. This fundamental understanding is critical in the development of solid-state energy conversion devices, which could have impact in the way energy is utilized and converted in the future.