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Updated: Oct 19, 2025
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Forming, Confining, and Observing Microtubule-Based Active Nematics
Published on: January 13, 2023
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Submersed micropatterned structures control active nematic flow, topology, and concentration
Kristian Thijssen1,2, Dimitrius A Khaladj3, S Ali Aghvami4,5
1The Rudolf Peierls Centre for Theoretical Physics, Department of Physics, University of Oxford, Oxford OX1 3PU, United Kingdom.
Summary
Researchers developed a new method to control active fluid dynamics using submerged micropatterned structures. This technique allows for tunable manipulation of flow, topology, and composition in active films, enabling new microfluidic applications.
Area of Science:
- Soft Matter Physics
- Fluid Dynamics
- Microfluidics
Background:
- Rheological matter's properties are crucial for its applications.
- Active fluids exhibit complex dynamics due to internal structure and energy input.
- Controlling these active systems is key to harnessing their potential.
Purpose of the Study:
- To propose and demonstrate a tunable method for controlling active films.
- To engineer flow, topology, and composition within these films.
- To establish rheological coupling through indirect means.
Main Methods:
- Utilizing fully submersed micropatterned structures in an underlying oil layer.
- Establishing rheological coupling via depth-dependent viscous dissipation.
- Employing simulations to understand the interaction between structures and active films.
Main Results:
- Micropatterned structures create effective virtual boundaries in active nematic films.
- These boundaries arise from depth-dependent viscous dissipation.
- The method allows for precise, nonintrusive control over active film dynamics.
Conclusions:
- The developed method offers a convenient and tunable approach to engineer active microfluidic systems.
- Indirect control via effective dissipation provides a novel pathway for manipulating active films.
- This technique facilitates the design of complex, out-of-equilibrium systems.
