How To Capture Active Particles

Condensed Matter journal club

How To Capture Active Particles

  • Event time: 11:30am
  • Event date: 15th February 2013
  • Speaker: Joakim Stenhammar (Formerly School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details


In many applications, it is important to catch collections of autonomously navigating microbes and man-made microswimmers in a controlled way. Using computer simulation of a two-dimensional system of self-propelled rods we show that a static chevron-shaped wall represents an excellent trapping device for self-motile particles. Its catching efficiency can be controlled by varying the apex angle of the trap which defines the sharpness of the cusp. Upon decreasing the angle we find a sequence of three emergent states: no trapping at wide angles followed by a sharp transition towards complete trapping at medium angles and a crossover to partial trapping at small cusp angles. A generic trapping "phase diagram" maps out the conditions at which the capture of active particles at a given density is rendered optimal.
PRL 108 article 268307 (2012)
pdf version


A. Kaiser, H. H. Wensink, H. Löwen

About Condensed Matter journal club

Given the diversity of research in the CM group, chosen topics vary widely. We tend to stick to high-impact journals - Nature, Science, PNAS and PRL have been popular - but this is not prescriptive..

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