Control of active polymeric filaments by chemically-powered nanomotors

Abstract

Active materials with distinctive nonequilibrium properties have diverse materials science applications. Active systems are common in living matter, such as the filament network in the cell that is activated by molecular motors, and in materials science as exemplified by hydrogels activated by chemical reactions. Here we describe another class of active polymeric filament systems where the filaments are activated by embedded chemically-powered nanomotors that have catalytic and noncatalytic parts. Chemical reactions on the catalytic surfaces produce forces that act on the polymeric filaments. By changing the nonequilibrium conditions these forces can be made to change sign and thereby compress or expand the filaments. The embedded motors provide both the source of activity and the means to control the filament conformational structure. As an example of control, we show that oscillatory variations of the chemical constraints yield gel-like networks that oscillate between expanded or compressed forms, much like those of hydrogels.

8 pages, 7 figures

References in corpus (9)

• Physics of Microswimmers - Single Particle Motion and Collective Behavior
• Designing phoretic micro- and nano-swimmers
• 'Fuelled' motion: phoretic motility and collective behaviour of active colloids
• Multi-Particle Collision Dynamics -- a Particle-Based Mesoscale Simulation Approach to the Hydrodynamics of Complex Fluids
• The physics of active polymers and filaments
• Autophoretic locomotion from geometric asymmetry
• Pulling and Pushing a Cargo With a Catalytically Active Carrier
• Active polymer rings: activity-induced collapse and dynamical arrest
• Chemotactic and hydrodynamic effects on collective dynamics of self-diffusiophoretic Janus motors

Cited by in corpus (2)

• Tangentially Driven Active Polar Linear Polymers -- An Analytical Study
• Instability and self-propulsion of flexible autophoretic filaments