ChE Seminar: Dr. Mark D. Ediger
|Event Date:||February 5, 2019|
|Speaker:||Dr. Mark D. Ediger|
|Speaker Affiliation:||University of Wisconsin-Madison|
|Contact Name:||Davidson School of Chemical Engineering
|Open To:||Attendance required for PhD students
|School or Program:||Chemical Engineering
Dr. Mark D. Ediger, Hyuk Yu Professor of Chemistry University of Wisconsin-Madison
Dr. Mark D. Ediger
Hyuk Yu Professor of Chemistry
University of Wisconsin-Madison
Part of the Fall 2018 Graduate Seminar Series
"Physical vapor deposition as a route to organic glasses with high chemical stability and controlled anisotropic packing"
Tuesday, February 5, 2019
3:00 p.m. – 4:15 p.m.
Reception at 2:30 p.m. in Henson Atrium
Glasses are generally regarded as highly disordered and the idea of “controlling” molecular packing in glasses is reasonably met with skepticism. Physical vapor deposition (PVD) allows a surprising amount of control over molecular packing in organic glasses and can be used to test the limits of amorphous packing in two ways, both of which are relevant for applications such as organic light emitting diodes (OLEDs). PVD can prepare glasses that approach the limits of the most dense and lowest energy amorphous packings that are possible. The activation barriers for rearrangements in these materials are very high, giving rise to high thermal and chemical stability. In addition, PVD allows control over anisotropic packing in glasses. For rod-shaped molecules, for example, glasses can be prepared in which the molecules have a substantial tendency to stand-up or lie-down relative to the substrate. The high density and anisotropic packing of PVD glasses can be explained by a mechanism that is “anti-epitaxial” as structure is templated by the top surface rather than by the underlying substrate.
Mark Ediger received his Ph.D. from Stanford University in 1984 and moved to the University of Wisconsin-Madison as an assistant professor in the Department of Chemistry. He is currently the Hyuk Yu Professor of Chemistry at UW-Madison. His research is focused on organic glasses, both polymeric and low molecular weight materials. Current research projects include mobility induced in glasses by deformation and the formation of ultra-stable and anisotropic glasses by physical vapor deposition. Ediger has served on advisory boards for Macromolecules, the Journal of Polymer Science B: Polymer Physics Edition, and the Journal of Chemical Physics, and is currently an Associate Editor for the Journal of Chemical Physics. He served as Chair of the Polymer Physics Gordon Conference in 2004 and Chair of DPOLY in 2008. He received the DPOLY Dillon Medal in 1993 and the ACS Hildebrand Award in 2013, and the APS Polymer Physics Prize in 2015.
Learn more about Dr. Mark Ediger at: https://www.chem.wisc.edu/users/ediger