ChBE Seminar Series: Young Jong Lee
Tuesday, November 11, 2014
11:00 a.m.-12:15 p.m.
Room 2108, Chemical and Nuclear Engineering Bldg.
Professor Jeffery Klauda
Coherent Raman Imaging of the Molecular Structures of Complex Polymeric Materials
Young Jong Lee
Biosystems and Biomaterials Division
Material Measurement Laboratory
Coherent Raman microscopy has been used to acquire spatially resolved chemical information of biological and soft materials systems, faster than conventional spontaneous Raman microscopy. Here I show that broadband coherent anti-Stokes Raman scattering (BCARS) microscopy can provide chemical composition images as well as molecular orientation images of complex polymeric materials. I present polarization-controlled BCARS images to characterize the molecular structures (chain orientation, molecular weight, local stress) of high performance polymers. I will also discuss the structure and rheology of the polymeric materials on the molecular scale.
About the Speaker
Young Jong Lee is currently working as Research Chemist at Biosystems and Biomaterials Division in National Institute of Standards and Technology (NIST). He received a Ph.D. degree from Seoul National University in 2001 under the supervision of Professor Seong Keun Kim on time-resolved spectroscopy of alkali atoms, aromatic molecules, and fullerenes. Then, he joined Professor Barbara’s group as a postdoctoral fellow in the University of Texas at Austin and performed research focused on ultrafast spectroscopy of the hydrated electron and single-molecule spectroscopy of conjugated polymers. Since 2006, he has worked at National Institute of Standards and Technology in Gaithersburg, MD, to develop coherent Raman imaging techniques to investigate biological systems and polymeric materials. (Homepage)