Fall Chem501 Seminar
UT Host: Dr. Michael Sepaniak
Speaker: Dr. Tessa Calhoun
Assistant Professsor-Department of Chemistry
The University of Tennessee
Title: “Nonlinear Phenomena at the Edge”
Abstract: The chemistry at interfaces dominates the properties of systems as diverse as nanoparticle luminescence and antibiotic resistance. Despite the large difference in samples, there is commonality in the challenges presented by isolating the relatively small signals at these unique boundaries. Using a suite of nonlinear spectroscopic and microscopic techniques, we are probing both material and biological surfaces and the molecules that interact with them in new ways. For example, we have developed the ability to directly measure surface states on quantum dots using electronic sum frequency generation microspectroscopy. The broad energetic distribution of signal we measure provides evidence for the existence of both deep and shallow traps. In other work, our probing of membrane-associated small molecules with living microbial cells reveals unexpected behavior that may help explain their resistance to current drugs. Overall, our efforts open up new pathways of exploration and understanding of interfacial complexity.
Bio: Tessa Calhoun completed her B.S. at Iowa State University, and earned her Ph.D. from the University of California, Berkeley in 2010 under the supervision of Prof. Graham Fleming. After spending three years as a Lewis-Sigler Fellow in the Lewis-Sigler Institute for Integrative Genomics at Princeton University, she joined the faculty in the Chemistry Department at the University of Tennessee, Knoxville. Her research interests include the use of nonlinear microscopy and spectroscopy to probe chemical behavior at complex interfaces.
Thursday, October 31, 2019 at 3:45pm to 5:00pm
Buehler Hall, 555
1420 Circle Drive, Knoxville, TN 37996