Mon, Jan 4 4:00pm to 7:00pm
2033 Young Hall
Speaker Prof. Mark D. Ediger
Hosted by
Dept. of Chemistry and Biochemistry, UCLA

"Control of Stability and Molecular Orientation in Organic Glasses (Or How to Make a Million-Year-Old Glass in 10 Minutes)"

Abstract: Glasses play an important role in technology as a result of their macroscopic homogeneity (e.g., the clarity of window glass) and the ability to tune properties  through composition changes.  A problem with liquid-cooled glasses is that they exhibit marginal kinetic stability and slowly evolve towards lower energy glasses and crystalline states.   We have used physical vapor deposition and the mobility of glassy surfaces to prepare what are likely the most stable glasses on the planet.  Our materials have the properties expected for “million-year-old” glasses, including high density and low enthalpy, and they can exhibit much higher photochemical stability.  Surprisingly, these glasses “melt” like crystals, with a constant velocity transformation front.  

We have discovered deposition conditions that combine high stability with substantial molecular orientation.  We have used computer simulations to understand why some deposition conditions orient molecules vertically and others orient them horizontally. These developments present major opportunities to expand our understanding of amorphous packing and to design new classes of anisotropic solids for applications such as organic electronics.  


Location: 2033 Young Hall

Time: 4:00 PM


Location: 3037 Young Hall

Time: 5:15 PM