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“School of Nano-Sciences”

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Paper   IPM / Nano-Sciences / 14648
School of Nano Science
  Title:   Active Brownian particles and runand-tumble particles separate inside a maze
  Author(s): 
1 . Maryam Khatami
2 . Katrin Wolff
3 . Oliver Pohl
4 . Mohammad Reza Ejtehadi
5 . Holger Stark
  Status:   Published
  Journal: Scientific Reports
  Vol.:  6
  Year:  2016
  Pages:   37670
  Supported by:  IPM
  Abstract:
A diverse range of natural and artificial self-propelled particles are known and are used nowadays. Among them, active Brownian particles (ABPs) and run-and-tumble particles (RTPs) are two important classes. We numerically study non-interacting ABPs and RTPs strongly confined to different maze geometries in two dimensions. We demonstrate that by means of geometrical confinement alone, ABPs are separable from RTPs. By investigating Matryoshka like mazes with nested shells, we show that a circular maze has the best filtration efficiency. Results on the mean first-passage time reveal that ABPs escape faster from the center of the maze, while RTPs reach the center from the rim more easily. According to our simulations and a rate theory, which we developed, ABPs in steady state accumulate in the outermost region of the Matryoshka-like mazes, while RTPs occupy all locations within the maze with nearly equal probability. These results suggest a novel technique for separating different types of self-propelled particles by designing appropriate confining geometries without using chemical or biological agents.

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