Control and Dynamical Lecture Series: Gary Friedman, "Magnetically Guided Self-Assembly"
Tuesday, October 10, 2006
2168 A.V. Williams Building
301 405 6615
Control and Dynamical Lecture Series
No Assembly Required: Magnetically Guided
Self-Assembly and Manipulation in Fluids
Department of Electrical and Computer Engineering
Self-assembly of micro- and nano-scale objects suspended in fluids has been proposed as a method of bottom-up fabrication for different types of systems such as RFIDs, displays and photonic crystals. Most bottom-up fabrication strategies seek to mimic molecular self-assembly and rely on short-range surface forces. This talk will focus on the use of long-range magnetic forces in guiding assembly and manipulation of solid particles, nanotubes, emulsion droplets and living cells.
Experimental results demonstrating programmable assembly and manipulation of magnetic and non-magnetic colloidal objects over a pattern of micro-magnets will presented (see some examples in the figure). Magnetically guided assembly and manipulation will be compared with other possible approaches (such as dielectrophoresis and optical tweezing) that rely on long-range forces. Basic issues regarding ability of long-range forces to guide assembly toward desired configurations will be discussed.
Prof. Gary Friedman received his PhD in Electrical Engineering from the University of Maryland in 1989. From 1989 until 2001 he has been a faculty member at the University of Illinois in Chicago initially affiliated with the Department of Electrical Engineering and Computer Science and later with the Bioengineering Department as well. In 2001 he joined the Department of Electrical and Computer Engineering at Drexel University and since 2005 he has also been a faculty at the Department of Surgery. His research interests span the area of applied magnetism and, in particular, modeling of hysteresis, magnetic drug delivery, magnetic fluids and magnetic micro-manipulation, nuclear magnetic resonance for micro-imaging and spectroscopy. His recent interests also include the use of atmospheric pressure room-temperature plasma discharges in medicine.
Prof. Eyad Abed, Prof. P.S. Krishnaprasad