CHBE 565-International Paper Co Seminar-Prof. Todd Squires, University of California, Santa Barbara, (Host: Prof. Baron Peters) "Driving Particles and Fluids Using Chemical Fluxes"
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- Chemical & Biomolecular Engineering and International Paper Company
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- Christy Bowser
- cbowser@illinois.edu
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- 217-244-9214
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- 39
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- Chemical & Biomolecular Engineering - Seminars and Events
Abstract: Suspensions of micron-scale particles and drops are ubiquitous in complex fluid formulations — foods, consumer products, pharmaceuticals, paints, coatings, and other materials and precursors. A number of equilibrium interactions have long been exploited to stabilize these suspensions and tune the properties of the materials. Here, we describe a set of non-equilibrium, chemical phenomena that allow particle migration to be directed and controlled over significantly longer ranges than is possible with equilibrium interactions. Examples will build upon somewhat classic pictures of diffusiophoresis or solvophoresis, wherein fluxes of various chemical species quite generically drive fluid flows and particle migration. We will lay out a conceptual, intuitive framework to understand, design, and manipulate these chemical fluxes — and illustrate with systems that drive particles into or out of dead-end pores; where particles might ‘find’ targets hidden within a maze, and where structures may collect specific suspended particles from millimeters away.
Bio: Todd Squires has served as a Professor of Chemical Engineering at UC Santa Barbara since 2005. His research group studies microfluidic systems, microrheology, and the physico-chemical hydrodynamics of soft materials and complex fluids, both experimentally and theoretically. Recent areas of interest include interfacial rheology of surfactant monolayers, in the context of the lung surfactant, emulsion and foam stability, and protein and asphaltene adsorption, developing a holistic view of the conceptual design of formulated products, connections between mechanical and thermodynamic properties in membrane transport, microfluidic systems to visualize and probe mass transport and interfacial reaction kinetics, and diffusiophoretic transport of suspended colloids and droplets. Honors include the NSF CAREER award, the Beckman Young Investigator, the Camille and Henry Dreyfus Teacher-Scholar award, the inaugural GSOFT Early Career Award in Soft Matter, and fellowship in the American Physical Society.