Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 118, Issue 38, Pages -Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.2106038118
Keywords
active matter; micropatterned control; topological defects; nematic film; active depletion
Categories
Funding
- NSF
- European Union's Horizon 2020 Research and Innovation Programme Marie Sklodowska-Curie Grant [722497]
- Engineering and Physical Sciences Research Council [EP/T031247/1]
- European Union's Horizon 2020 Research and Innovation Programme [851196]
- Division of Materials Research [1808926]
- NSF-Center of Research Excellence in Science and Technology: Center for Cellular and Biomolecular Machines at University of California Merced [HRD-1547848]
- Brandeis Biomaterials Facility Materials Research Science and Engineering Center [2011486]
- Direct For Mathematical & Physical Scien [1808926] Funding Source: National Science Foundation
- Division Of Materials Research [1808926] Funding Source: National Science Foundation
- European Research Council (ERC) [851196] Funding Source: European Research Council (ERC)
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The coupling between flows and material properties makes rheological matter widely applicable, and the study proposes a method for controlling flow, topology, and composition within active films by using micropatterned structures within an underlying oil layer to establish rheological coupling.
Coupling between flows and material properties imbues rheological matter with its wide-ranging applicability, hence the excitement for harnessing the rheology of active fluids for which internal structure and continuous energy injection lead to spontaneous flows and complex, out-of-equilibrium dynamics. We propose and demonstrate a convenient, highly tunable method for controlling flow, topology, and composition within active films. Our approach establishes rheological coupling via the indirect presence of fully submersed micropatterned structures within a thin, underlying oil layer. Simulations reveal that micropatterned structures produce effective virtual boundaries within the superjacent active nematic film due to differences in viscous dissipation as a function of depth. This accessible method of applying positiondependent, effective dissipation to the active films presents a nonintrusive pathway for engineering active microfluidic systems.
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