News & Events
Chemistry Weekly Seminar - PhD Candidate Amara Zuhaib
Posted on 2019-01-25 in Events
Jan 29, 2019
Structural Characterization of Organic Glasses by NEXAFS Spectroscopy
Glasses are non-equilibrium material that lack long-range order. Over the last decade, organic glasses with exceptional stability and increased density have been formed by physical vapour deposition (PVD). The stability of these glasses is attributed to the increased surface mobility during deposition. There are knowledge gaps in understanding the formation and structure of these highly stable dense glasses. The first objective of this research work uses the Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy to study the internal conformation of molecules in these glasses. We hypothesize that observed changes in glass density can be related to molecular conformations which permits tighter packing. Different conformations of molecules within organic glass are probed by NEXAFS spectroscopy and interpreted with DFT spectroscopic simulations. Characteristic spectroscopic energy shifts were related to the conformation of the molecules that makeup the glass as a function of deposition conditions.
The second objective of this research work was to utilize the orientation sensitivity (linear dichroism) in the NEXAFS spectroscopy of molecular glasses to study their orientational order. Molecular glasses grown at substrate temperatures ranging from 0.79 Tg - 1.01 Tg (where Tg is the glass transition temperature) show characteristic linear dichroism differences in their NEXAFS spectra. Some unique information has been explored in detail to understand this orientation in organic glasses.
Chemistry Weekly Seminar - Dr. Rob Britton
Posted on 2019-03-14
Dr. Robert Britton, Department of Chemistry, SImon Fraser University, will present a seminar at 4:00 pm in Thorvaldson 110.
Special Seminar - Dr. Darren Derksen
Posted on 2019-03-06
Dr. Darren Derksen will present a Special Seminar at 11:30 am in Geology 261
Special Seminar - Dr. Amy Stevens
Posted on 2019-02-08
Dr. Amy Stevens, Department of Chemistry, will present a seminar
Special Seminar - Dr. Joe B. Gilroy
Posted on 2019-01-21
Dr. Joe B. Gilroy will present a Special Seminar at 10:30 in Thorvaldson 205A
Spinks Lecture Series - Dr. Chris Chang
Posted on 2018-12-17
Dr. Chris Chang, University of California, Berkley, will present a seminar