Levich Institute Seminar Announcement, 10/24/2017
Steinman Hall, Room #312
(Chemical Engineering Conference Room)
Professor Joseph Seymour
Montana State University
Department of Chemical and Biological Engineering
"Measurement of Dynamics by NMR in Polymers, Colloids and Near Critical Fluids"
Nuclear magnetic resonance (NMR) provides direct measurement of time and length scale dependent displacement dynamics. Current research on solvent dynamics in a weak gel of a concentrated cellulosic polymer solution demonstrates glass-like mean squared displacements and provides a network length scale connected to dynamic heterogeneity. The hydrodynamic dispersion of colloid suspension flow in a microfluidic capillary indicates particle caging that induces anomalous transport that is modeled by a continuous time random walk. The displacement dynamics measured in turbulent Rayleigh-Bernard flow of near critical and supercritical fluids are shown to exhibit power law scaling consistent with superstatistics models and the data determines the Kolomgorov scale of the turbulence. Data such as this has potential to provide a means to connect micro scale dynamics to macro scale material or transport properties.
BRIEF ACADEMIC/EMPLOYMENT HISTORY
Joe Seymour is co-director of the Magnetic Resonance Lab and a Professor in the Department of Chemical and Biological Engineering at Montana State University. He received his PhD in Chemical Engineering from the University of California-Davis in 1994 and B.S. from Florida State University in 1989. As an NSF International Program Postdoctoral Fellow in Physics at Massey University, New Zealand research was conducted in Antarctica to study the structure of sea ice using NMR in the Earth's magnetic field. He was a postdoc at the Lovelace Institute in New Mexico 1997-1999 using NMR to study granular flows and a Humboldt Fellow in Physical Chemistry in Ulm, Germany 1999-2000 studying percolation structure porous media. He has been an Asst., Assoc. and full Professor (and ski bum) at Montana State University in Bozeman since 2001.
RECENT RESEARCH INTERESTS
Dynamics in complex fluids, turbulent flows and phase transitions