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Join the Department of Chemical and Biomolecular Engineering for the Reilly Award Seminar Lecture, featuring Kathleen J. Stebe, the Richer & Elizabeth Goodwin Professor of Chemical and Biomolecular Engineering and Mechanical Engineering and Applied Mechanics in the School of Engineering and Applied Sciences at the University of Pennsylvania. AbstractNematic liquid crystals (NLCs) are highly non-linear fluids that have elastic responses that resist nematogen rearrangement and high-energy defect sites at which nematogen order is lost. Generally, the field of nematic colloids seeks to develop control over these elastic responses and defect structures to tailor colloidal interactions. We have been studying ferromagnetic disk colloids rotated by an in-plane magnetic field in nematic liquid crystals. The disk diameter and rotation rate are sufficiently slow that colloid inertia is negligible. In Newtonian fluids, these colloids rotate without translation. However, in NLC, the colloids’ anisotropic defect structure and the NLC’s elastic response generate broken symmetries that propel colloid translation. For patchy, rough colloids, a defect loop which forms on the disk undergoes periodic defect pinning, release, and contraction.This periodic defect motion generates a swim stroke that powers colloidal swimming. Changes in defect configuration with rotation rate provide a steering mechanism. In addition to this swimming motion, colloid shape and surface chemistry generate long-ranged emergent interactions with neighboring passive colloids in quasi-static settings. Furthermore, the non-linear response of the nematic fluid host allows pair interactions among rotating disks that differ strikingly in range and form from their static counterparts. These interactions provide a rich toolkit for reconfigurable materials assembly and open important fundamental questions regarding swimming at low Reynolds number in NLC. Biography Kathleen J. Stebe is the Richer & Elizabeth Goodwin Professor of Chemical and Biomolecular Engineering and Mechanical Engineering and Applied Mechanics in the School of Engineering and Applied Sciences at the University of Pennsylvania. Educated at the City College of New York, she received a B.A. in economics and a Ph.D. in chemical engineering at the Levich Institute advised by Charles Maldarelli. After a post-doctoral year in Compiegne, France under the guidance of Dominique Barthes-Biesel, she joined the Department of Chemical Engineering at Johns Hopkins University, where she became professor and served as the department chair. Thereafter, she joined the University of Pennsylvania, where she served in various administrative capacities including department chair and deputy dean. She has been recognized by the National Academy of Engineering, the American Academy of Arts and Sciences, the Johns Hopkins Society of Scholars, and as a Fellow of the American Physical Society and of the Radcliffe Institute. Kathleen is active in APS Division of Soft Matter Physics, and the ACS Division of Colloids and Surfaces, as well as the AIChE. Her research focuses on directed assembly in soft matter and at fluid interfaces, with an emphasis on confinement, geometry, and emergent structures in far from equilibrium settings for novel functional materials.   Originally published at energy.nd.edu.

Regístrese ahora El octavo informe comprensivo del Instituto Kroc, que cubre el período comprendido entre diciembre de 2022 y noviembre de 2023, ofrece un análisis cuantitativo y cualitativo del estado de la implementación del Acuerdo Final; presenta un análisis comparado internacional para enriquecer el diálogo alrededor de este proceso; y resalta los hitos alcanzados y los obstáculos encontrados durante el período de implementación. También identifica las oportunidades para avanzar en la implementación integral del Acuerdo Final. El Acuerdo Final le otorgó al Instituto Kroc la responsabilidad principal de dar apoyo técnico y hacer seguimiento a su implementación. En esa medida, a través de la Iniciativa Barómetro de la Matriz de Acuerdos de Paz (PAM), desde 2016 el Instituto Kroc ha monitoreado la implementación de 578 compromisos contenidos en el texto del Acuerdo Final, con una mirada especial a los enfoques transversales. Le extendemos una especial invitación para que nos acompañe en el lanzamiento del octavo informe comprensivo, cuyos hallazgos son el resultado del monitoreo a la implementación siguiendo los principios de independencia, imparcialidad y rigurosidad académica. Durante el webinar podrá conocer el estado de la implementación del Acuerdo Final, así como los avances, retos y oportunidades para fortalecer el proceso. Esperamos pueda acompañarnos y participar del lanzamiento. Regístrese ahora Originally published at kroc.nd.edu.