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Hydrodynamic ratchet: Controlled motion of a polymer in an alternating microchannel flow

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons21881

Mikhailov,  Alexander S.
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Zhang, Z., Stark, H., & Mikhailov, A. S. (2013). Hydrodynamic ratchet: Controlled motion of a polymer in an alternating microchannel flow. EPL, 104(1): 14002. doi:10.1209/0295-5075/104/14002.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-BD8A-C
Abstract
Using ratchets, periodic or irregular oscillations can be transformed into steady translational or rotational motions. Here, we consider a model system that operates as a hydrodynamic ratchet. A polymer is placed inside a narrow channel where an oscillating Poiseuille flow is externally created. The ratchet mechanism is implemented by introducing a feedback control for the lateral position of the polymer through which its mobility becomes effectively dependent on the direction of its motion along the channel. We employ the semi-flexible elastic chain modeling for the polymer and use the method of multi-particle collision dynamics to simulate the fluid. We indeed observe directed motion of the polymer and determine the dependence of the propagation velocity on the model parameters.