Filament actuation by an active colloid at low Reynolds number

Abstract

Active colloids and externally actuated semi-flexible filaments provide basic building blocks for designing autonomously motile micro-machines. Here, we show that a passive semi-flexible filament can be actuated and transported by attaching an active colloid to its terminus. We study the dynamics of this assembly when it is free, tethered, or clamped using overdamped equations of motion that explicitly account for active fluid flow and the forces it mediates. Linear states are destabilized by buckling instabilities to produce stable states of non-zero curvature and writhe. We demarcate boundaries of these states in the two-dimensional parameter space representing dimensionless measures of polar and apolar activity. Our proposed assembly can be used as a novel component in the design of micro-machines at low Reynolds number and to study elastic instabilities driven by "follower" forces.

References in corpus (5)

• The hydrodynamics of swimming microorganisms
• Physics of Microswimmers - Single Particle Motion and Collective Behavior
• Designing phoretic micro- and nano-swimmers
• Self-propelled Worm-like Filaments: Spontaneous Spiral Formation, Structure, and Dynamics
• Many-body microhydrodynamics of colloidal particles with active boundary layers

Cited by in corpus (5)

• Structure and dynamics of a self-propelled semiflexible filament
• Conformation and dynamics of a self-avoiding active flexible polymer
• Beating to rotational transition of a clamped active ribbon-like filament
• Diffusion of an Active Particle Bound to a Generalized Elastic Model: Fractional Langevin Equation
• Spiral folding of a flexible chain of chiral active particles