20251114_seminar_Luijten
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- Registration Form: https://forms.gle/bhorMGX21BypBJ2o9
- Date and Time: Nov 14 (Fri), 2025 14:00-15:30
- Venue: Katsura Campus, Kyoto University, A4-115 + Zoom
- Speaker: Prof. Erik Luijten (Northwestern University, USA)
- Title: Hydrodynamically controlled collective behavior of self-driven particles
- Abstract: Microswimmers of either biological or synthetic nature exhibit a variety of non-equilibrium collective behavior, including aggregation, phase separation, and self-organization. While these behaviors are governed by hydrodynamic self-propulsion, most analytical and numerical efforts devoted to their explanation rely on greatly simplified models of the hydrodynamic interactions. While this simplification is motivated by the complex and dynamic geometry posed by colloidal assemblies, I will demonstrate several remarkable phenomena that require explicit temporal and spatial resolution of hydrodynamic flow fields to attain both mechanistic understanding and predictive capabilities. For translating microswimmers, the propulsion mode can be exploited to realize activity-based segregation in confined geometries. I will illustrate how systematic optimization of such “filters” can be achieved. For self-driven spinners, the presence of a substrate results in unique flows from which spatial and orientational order emerges. I will show that a transition in particle orientation accompanies the appearance of crystallinity as the packing fraction is increased. Further exploration reveals a rich, tunable state space, offering insights into the biophysics of natural microswimmers with rotational motion as well as into the design of synthetic spinner systems.
I.P. Madden, L. Wang, J. Simmchen and E. Luijten, Small 18, 2107023 (2022).
I.P. Madden and E. Luijten, Phys. Rev. E 111, 065403 (2025).
R. Pingali and E. Luijten, Phys. Rev. Res., in press (2025).
- Short Biography: Professor Erik Luijten received his MSc from the Institute for Theoretical Physics at Utrecht University and his PhD (cum laude) from Delft University of Technology in the Netherlands. Following appointments as research associate at the Max Planck Institute for Polymer Research and the University of Maryland, he was an assistant professor and later associate professor in the Department of Materials Science at the University of Illinois at Urbana-Champaign. In 2009 he joined Northwestern University, with appointments in Materials Science and Engineering and Applied Mathematics. From 2016 until 2021, he served as Chair of the Department of Materials Science and Engineering. He is currently Associate Dean for Research and Doctoral Studies in the McCormick School of Engineering at Northwestern University. Professor Luijten’s research interests encompass a wide range of topics, with an emphasis on self-assembly, soft materials, dielectric systems, and complex fluids. These problems are generally studied via large-scale computer simulations and innovative algorithms. Professor Luijten received the IAPWS Helmholtz Award, an NSF CAREER Award, and a Xerox Award for Faculty Research. In 2013 he was elected Fellow of the American Physical Society, and in 2023 Fellow of the American Association for the Advancement of Science.