2004 Milwaukee Section Award BUILDING A BETTER CHEMICAL IMAGE: WHAT NEAR-INFRARED MULTISPECTRAL IMAGING TELLS US ABOUT CHEMICAL REACTIONS AND SAMPLE INHOMOGENEITY Chieu D. Tran Professor of Chemistry Marquette University

Friday November 19, 2004 Klemmer's Banquet Center 10401 W. Oklahoma Avenue West Allis, Wisconsin

DIRECTIONS

Near-infrared spectrometry has been widely used in chemistry for chemical analysis and characterization. Applications of imaging technique in chemistry have, however, been limited. Efforts have been made in the last few years to introduce the spectroscopic information to the imaging technique to enhance its utilization. This is accomplished in the multispectral imaging technique because this technique is based on the synergistic combination of the spectroscopy with the imaging. Specifically, a multispectral imaging spectrometer can simultaneously record spectral and spatial information of a sample; i.e., the recorded images contain signals that are generated by a sample, plotted as a function of spectral and spatial distribution. Chemical and physical states of the sample can be elucidated from such images. Instrumentation development and several applications of the imaging spectrometer including the authentication of currency, the determination of amino acid residues in peptides which are synthesized by the combinatorial solid phase peptide synthesis, the chemical inhomogeneity of nanocomposite materials and the photo-induced changes in liquid crystals will be discussed.

Chieu D. Tran is a professor of chemistry at Marquette University. He received his Ph. D. degree from Texas A & M University. Following postdoctoral research at the Royal Institution of Great Britain, he joined Brookhaven National Laboratory as a staff scientist. In 1986 he joined the faculty of Marquette University. As an author, Tran has authored over 130 publications in the area of instrumentation development and spectrochemical analysis. He has given more than 150 invited talks at national and international conferences, universities and research institutions. He is the recipient of the 1992 Perkin-Elmer International Liquid Chromatography Technical Paper Award, the Shannon Award given by the National Institutes of Health (NIH), the 1999 Gold Medal Award given by the Society for Applied Spectroscopy (SAS) and the 2002 Scientific Achievement Award given by the Sigma Xi. He serves on Editorial Board of several journals including Analytical Letters, Applied Spectroscopy Reviews and Talanta. His current research interests include development and applications of acousto-optic devices, development and application of multispectral imaging in the Near-, Middle and Far-Infrared regions, chemistry and applications of Sol-Gels and green chemistry, specifically, room temperature ionic liquids.