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Colloidal transport by active filaments
Published in American Institute of Physics Inc.
2017
PMID: 28088142
Volume: 146
   
Issue: 2
Abstract
Enhanced colloidal transport beyond the limit imposed by diffusion is usually achieved through external fields. Here, we demonstrate the ballistic transport of a colloidal sphere using internal sources of energy provided by an attached active filament. The latter is modeled as a chain of chemo-mechanically active beads connected by potentials that enforce semi-flexibility and self-avoidance. The fluid flow produced by the active beads and the forces they mediate are explicitly taken into account in the overdamped equations of motion describing the colloid-filament assembly. The speed and efficiency of transport depend on the dynamical conformational states of the filament. We characterize these states using filament writhe as an order parameter and identify ones yielding maxima in speed and efficiency of transport. The transport mechanism reported here has a remarkable resemblance to the flagellar propulsion of microorganisms which suggests its utility in biomimetic systems. © 2016 Author(s).
About the journal
JournalData powered by TypesetJournal of Chemical Physics
PublisherData powered by TypesetAmerican Institute of Physics Inc.
ISSN00219606
Open AccessNo
Concepts (24)
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    Ballistics
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    Biomimetics
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    Equations of motion
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    BALLISTIC TRANSPORTS
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    BIOMIMETIC SYSTEMS
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    Colloidal sphere
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    Conformational state
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    FILAMENT ASSEMBLY
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    Internal source
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    Order parameter
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    Transport mechanism
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    Flow of fluids
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    Colloid
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    Molecular motor
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    ACTIVE TRANSPORT
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    Chemistry
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    Microtubule
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    Molecular dynamics
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    Motion
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    BIOLOGICAL TRANSPORT, ACTIVE
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    Colloids
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    Microtubules
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    Molecular dynamics simulation
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    Molecular motor proteins