Dynamics of swimming bacteria at complex interfaces
By D. Lopez, Eric Lauga. 2014
175 citations recorded by the source corpus.
Flagellated bacteria exploiting helical propulsion are known to swim along circular trajectories near surfaces. Fluid dynamics predicts this circular motion to be clockwise (CW) above a rigid surface (when viewed from inside the fluid) and counter-clockwise (CCW) below a free surface. Recent experimental investigations showed that complex physicochemical processes at the nearby surface could lead to a change in the direction of rotation, both at solid surfaces absorbing slip-inducing polymers and interfaces covered with surfactants. Motivated by these results, we use a far-field hydrodynamic model to predict the kinematics of swimming near three types of interfaces: clean fluid-fluid interface, slipping rigid wall, and a fluid interface covered by incompressible surfactants. Representing the helical swimmer by a superposition of hydrodynamic singularities, we first show that in all cases the surfaces reorient the swimmer parallel to the surface and attract it, both of which are a consequence of the Stokes...
Subfields: Condensed Matter Physics, Materials Chemistry, Molecular Biology
View Paper: https://www.semanticscholar.org/paper/29e0c481cc3bac23aa22f9589c9db44921b144d3
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In Condensed Matter Physics
- Eric Lauga
- S. Michelin
- David Saintillan
- J. Rodrigo Vélez-Cordero
- T. Powers
- T. Pedley
- Alfredo Soldati
- Gregory A. Voth
In Materials Chemistry
In Molecular Biology
Citations in the corpus
- Bacterial hydrodynamics (2015, background): “…if the rigid wall is replaced by a free surface, leading to circular swimming in the oppo- 11 site direction (Di Leonardo et al., 2011), and a possible co-existence between CW and CCW for cell populations near complex interfaces (Lemelle et al., 2013; Lopez & Lauga, 2014; Morse et al., 2013).”