Self-propelled rods near surfaces

By J. Elgeti, Gerhard Gompper. 2009

169 citations recorded by the source corpus.

We study the behavior of self-propelled nano- and micro-rods in three dimensions, confined between two parallel walls, by simulations and scaling arguments. Our simulations include thermal fluctuations and hydrodynamic interactions, which are both relevant for the dynamical behavior at nano- to micro-meter length scales. In order to investigate the importance of hydrodynamic interactions, we also perform Brownian-dynamics–like simulations. In both cases, we find that self-propelled rods display a strong surface excess in confined geometries. An analogy with semi-flexible polymers is employed to derive scaling laws for the dependence on the wall distance, the rod length, and the propulsive force. The simulation data confirm the scaling predictions.

Subfields: Condensed Matter Physics, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/82c51270ee1842ba0aa73ab2accd7eb13c9bbb76

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In Condensed Matter Physics

In Materials Chemistry

In Mechanical Engineering

Citations in the corpus

Pressure is not a state function for generic active fluids (2014, background): “In addition to the external force −∇V (x), we include an external torque Γ(x, θ), which may, for example, describe the well–documented alignment of bacteria along walls [31].”
Hydrodynamics of soft active matter (2013, background): “The behavior of collections of self-propelled or active particles is strongly affected by the presence of boundaries and obstacles (Wensink and Löwen, 2008; Elgeti and Gompper, 2009).”
Fluid dynamics and noise in bacterial cell–cell and cell–surface scattering (2011, background): “[29] Elgeti J, Gompper G (2009) Self-propelled rods near surfaces.”
The hydrodynamics of swimming microorganisms (2008, background): “Note that rotational diffusion also plays an important role [236].”
Active Particles in Complex and Crowded Environments (2016, background): “This effect has been observed for rods and spheres in a linear channel (Elgeti and Gompper, 2009; Volpe et al., 2011; Wensink and Löwen, 2008; Wysocki et al., 2015) as well as for bacteria in circular cavities (Vladescu et al., 2014).”
Physics of microswimmers—single particle motion and collective behavior: a review (2014, methodology): “…the experiments of Drescher et al. (2011) suggest that cell-surface collisions determine the cell behavior next to surfaces, as proposed by Li and Tang (2009), Elgeti and Gompper (2009), and Hernadez-Ortiz et al. (2009), rather than long-range hydrodynamic interactions (Berke et al., 2008).”
Brownian motion of a self-propelled particle. (2010, methodology): “For rodlike particles [58, 59] the first two [37], and for spherical particles the first four [60], moments of the probability distribution function for displacements were calculated.”