Towards active microfluidics: Interface turbulence in thin liquid films with floating molecular machines

Abstract

Thin liquid films with floating active protein machines are considered. Cyclic mechanical motions within the machines, representing microscopic swimmers, lead to molecular propulsion forces applied to the air-liquid interface. We show that, when the rate of energy supply to the machines exceeds a threshold, the flat interface becomes linearly unstable. As the result of this instability, the regime of interface turbulence, characterized by irregular traveling waves and propagating machine clusters, is established. Numerical investigations of this nonlinear regime are performed. Conditions for the experimental observation of the instability are discussed.

9 pages, 8 figures, RevTeX, submitted to Physical Review E

References in corpus (8)

• A Simplest Swimmer at Low Reynolds Number: Three Linked Spheres
• The Force Exerted by a Molecular Motor
• Nonequilibrium Fluctuations, Travelling Waves, and Instabilities in Active Membranes
• Analytic results for the three-sphere swimmer at low Reynolds number
• Mechanical Response of a Small Swimmer Driven by Conformational Transitions
• Nonlinear Relaxation Dynamics in Elastic Networks and Design Principles of Molecular Machines
• Instabilities and waves in thin films of living fluids
• Molecular Synchronization Waves in Arrays of Allosterically Regulated Enzymes

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