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2019.3.18--Photons, Radicals, Bubbles and Beer: Using Photochemistry and Electron Paramagnetic ResonanceSpectroscopy to Understand the Universe
Mar 19, 2019

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Title:

Photons, Radicals, Bubbles and Beer: Using   Photochemistry and Electron Paramagnetic ResonanceSpectroscopy to Understand   the Universe

Lecturer:

Malcolm D. E. Forbes

Location:

Lecture Hall118 , Building G, South Campus, Xidian University

Time:

2019-03-18   10:30:00

Lecturer    Profile

Malcolm D. E. Forbes  completed his university   training at the University of Illinois at Chicago, receiving a double major   B.S. degree in Chemistry and Mathematics in 1983. He undertook doctoral   studies at the University of Chicago, where he worked with the late Gerhard   L. Closs on the study of unstable spin-polarized   biradicals using time-resolved electron paramagnetic resonance spectroscopy.   In 1988, his accomplishments in this area were recognized with the Bernard   Smaller Prize for Research in Magnetic Resonance. After receiving his Ph.D.   degree, Malcolm was awarded a National Science Foundation Postdoctoral   Research Fellowship. From 1988 to 1990 heworked at the California Institute   of Technology with Nathan S. Lewis on interfacial charge transfer kinetics at   silicon/liquid junctions.
 
In July 1990, Malcolm joined   the Department of Chemistry at the University of North Carolina at Chapel   Hill and was promoted to Professor of Chemistry in 1999. From 20112014 he served as a Program Officer in the Chemistry Division   of the U. S. National Science Foundation in Arlington, VA.  In July   2015, Malcolm accepted the position of Professor of Chemistry and Director of   the Center for Photochemical Sciences at Bowling Green State University in   Ohio.
  Malcolm has received a number of awards and honors for his research: a   National Science Foundation Young Investigator Award (1993
1998), a Japan Society for the Promotion of Science   Foreign Fellowship Award (19981999), the 2000 Sir Harold Thomson Award   from Elsevier, a J. W. Fulbright Senior Scholar Award (20072008), and most recently he was a Distinguished   Visiting Project Professor at Kyoto University in Japan (2018). Malcolm was   co-Chair of the 2008 Gordon Research Conference on Electron DonorAcceptor Interactions, and coChair of the 2015 Gordon Research Conference on   Photochemistry.  He is a past President of the Inter-American   Photochemical Society (20142016).
  Malcolm
s research interests span a wide area of   physical organic chemistry. His primary focus is studying free radical   structure, dynamics and reactivity using a variety of magnetic resonance   techniques. Current projects include the fundamentals of spin chemistry,   proton-coupled electron transfer reactions, singlet oxygen topology in   heterogeneous media, drying and curing processes in thin films and coatings,   and the photodegradation and chain dynamics of polymers.  Malcolm has   published more than 115 papers and book chapters, and has presented more than   170 invited lectures.

Lecture   Abstract

Our laboratory has a long-standing interest in the   structure, reactivity, and dynamics of free radicals in both homogeneous and   heterogeneous media. In this lecture, the basic tenets of steady-state and   time-resolved (CW) electron paramagnetic resonance spectroscopy (SSEPR and   TREPR) are explained, and their use in understanding the physical and   chemical behavior of free radicals is outlined.  Examples to be   presented include the use of stable nitroxide spin probes to investigate the   drying and curing of architectural coatings, and to probe the physical   propertiesof structured (non-Newtonian) fluids at the molecular level.   Chemical reactivity involving free radicals can be studied directly using   TREPR, for example in the study of the mechanism for the lightstruck flavor   (so-called skunking) of beer.   Reactivity can also be investigated using spin trapping techniques. Two   different trapping methods will be presented: nitrones can be used to confirm   the mechanism of action of biocompatible polymer initiators, and the reaction   of hindered amines with singlet oxygen can be used to quantify the kinetics   and topology of such reactions in confined media.  Finally, the   application of EPR spectroscopy to studytwo aspects of polymer chain dynamics   in liquid solution will be presented: 1) main chain radicals of acrylic   polymers studied as a function of polymer structure and temperature, and 2)   long-range radical-triplet state pair interactions in acrylic polymers.

 

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