Title:
Anomalous Transport in Porous Environments due to Energy Barriers, Self-Propulsion and Dynamic Confinement Abstract:
The dynamic behavior of molecules and nanoparticles in confined environments, such as at interfaces and within porous materials, lead to complex and highly-varied phenomena, where heterogeneity may arise from spatial variation of the material/interface itself, from structural configurations, or through inhomogeneous dynamic behavior. To obtain relevant information about these complex dynamics, we have developed highly multiplexed single-molecule/single-particle tracking methods that acquire large numbers of trajectories in a given experiment, enabling robust statistical analysis of anomalous motion. Recent work in our lab has explored the 3D motion of both Brownian and self-propelled nanoparticles within highly interconnected porous environments (both static and dynamic), leading to insights linking microscopic pore-scale mechanisms to macroscopic transport. Examples to be discussed include the barrier-limited diffusive escape of nanoparticles from porous cavities, the enhanced motion of self-propelled catalytic Janus particles within 3D porous materials and the facilitated Brownian diffusion of nanoparticles within dynamically fluctuating porous environments. Bio:
Dan Schwartz is the Glenn L. Murphy Professor of Engineering at the University of Colorado Boulder. He was previously a faculty member in the Department of Chemistry at Tulane University. Dan's research interests include the dynamic behavior of molecules and nanoparticles in confined environments, including interfaces and porous media, with specialties in single-molecule microscopy, membrane separations, biomaterials, and heterogeneous (bio)catalysis. His recognitions include the Langmuir Award from the ACS Colloid Division, the NSF CAREER award, the Dreyfus Foundation Teacher-Scholar award, and selection as a Fellow of the American Physical Society and the American Chemical Society. Dan was a Senior Editor of the journal Langmuir, the American Chemical Society's journal of interfacial science from 2004-2019 and served as chair of the ACS Colloid and Surface Chemistry Division in 2016.
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