Year: 2024
Type: article
Abstract: Ensembles of suspended spinning particles in liquids form a distinct category of active matter systems known as chiral fluids. Recent experimental instances of dense chiral fluids have comprised of spinning colloidal magnets powered by an external rotating magnetic field. These particles interact through both magnetic and hydrodynamic forces, organizing collectively into circulating clusters characterized by unidirectional edge flows. Here, we externally drive the collective behavior of spinning colloids by leveraging diffusiophoretic interactions among the geometrically anisotropic particles. We show that these nanoscale interfacial flows lead to the formation of bound states between spinning colloids that are stabilized through near-field hydrodynamic and chemical interactions. At a collective level, we demonstrate that added diffusiophoretic interactions cause a loss in structural cohesion of the circulating clusters and promote expansion, while preserving global cluster inter-connectivity. The expanded cluster state is characterized by the formation of a dynamic interconnected network promoted by axi-asymmetric interactions around particles with attractive dipolar interactions dominating along the direction of the magnetic moment. This process is observed to be entirely reversible, offering external control over the emergent dynamics in dense chiral fluids, paving the way for new self-organization routes in chiral fluids and broader forms of active matter. Chiral active systems are composed of spinning constituent particles that self-organize into complex structures through hydrodynamic interactions. The authors develop methods to control these self-organized structures by introducing additional chemical interactions between spinning particles.
Source: Communications Physics
Authors: Jaideep Katuri, Navneet Kaur, William Uspal, Allison Cornelius, David Quashie, Jamel Ali
Language: English
Topic: Micro and Nano Robotics
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,790
Funders: National Science Foundation, National High Magnetic Field Laboratory, Florida Agricultural and Mechanical University, U.S. Army, American Chemical Society Petroleum Research Fund, Division of Materials Research, Core Research for Evolutional Science and Technology, High Magnetic Field Laboratory, Chinese Academy of Sciences, Air Force Office of Scientific Research
Awards: G1138554163, National High Magnetic Field Laboratory Renewal 2018-2022, Targeted Infusion Project: Enhancing Retention in the Chemical & Biomedical Engineering Program at Florida A and M University through Integrated Research, Teaching and Retention, Research Initiation Award: Multifunctional Intracellular Nano-Probes based on Engineered Bacterial Flagella, G354028113, G3560959519, G3658484145, G3856646889, G410635398, CC* Data Storage: KoaStore: A High Performance and Flexible Research Storage Resource, G5613623313, CREST Center for Complex Materials Design for Multidimensional Additive Processing (CoManD), G6010147111, G7248062449, G7319929996, HBCU-RISE: Enhancement of Research and Education Infrastructure in the Chemistry and Engineering of Multifunctional Materials, CC* Compute: Koa - A High Performance and Flexible Research Computing Resource
OpenAlex ID: W4402036621