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Tuesday, November 7, 2017 at 12:00pm
Abstract: Aerosols, particles that are suspended in a gaseous medium, are ubiquitous and found in nature and engineered systems. They occur in a range of sizes, shapes and compositions and are relevant to important phenomena such as climate change, human health, environmental and energy processes. These particles are both inadvertently and intentionally produced in a variety of systems. The availability of real time instrumentation to measure fine particles has greatly aided the understanding of formation, growth and transport of these aerosols. The talk will describe the use of a high flow, mini-differential mobility analyzer coupled with a mass spectrometer to unravel the mechanism of formation of particles in high temperature environments. The importance of measurement of the early stages of particle formation and their charge distributions will be elucidated. From the use of these precise laboratory based instruments, the presentation will transition to the description of low cost sensors for distributed aerosol measurements. The importance of calibrating these sensors and inverting the measured signals will be discussed.
Dr. Pratim Biswas received his B.Tech. degree from the Indian Institute of Technology, Bombay in 1980; his M.S. degree from the University of California, Los Angeles in 1981 and his doctoral degree from the California Institute of Technology in 1985. He joined Washington University in St. Louis in August 2000 as the inaugural Stifel and Quinette Jens Professor and Director of the Environmental Engineering Science Program. In 2006, he became the Chair of the newly created Department of Energy, Environmental and Chemical Engineering at Washington University in St. Louis. He directs the McDonnell Academy Global Energy and Environmental Partnership (MAGEEP) a consortium of 35 leading Universities across the globe. He has won several Teaching and Research Awards: was the recipient of the 1991 Kenneth Whitby Award given for outstanding contributions by the American Association for Aerosol Research; and the Neil Wandmacher Teaching Award of the College of Engineering in 1994; the David Sinclair Award by the American Association for Aerosol Research in 2013, the Lawrence K. Cecil Award in Environmental Chemical Engineering by AIChE in 2015; and the White Award in 2016 for pioneering work in electrostatic precipitation of aerosols. He is a Fellow of the American Association for Aerosol Research, the Saint Louis Science Academy and the International Aerosol Research Assembly. His research and educational interests are in aerosol science and technology, nanoparticle technology, energy and environmental nanotechnology, air quality and pollution control and the thermal sciences. He has published more than 345 refereed journal papers with his 50 PhD graduates, and presented more than 200 invited talks all across the globe.