Breakup of Colloidal Aggregates by Motile Bacteria

Condensed Matter lunchtime seminar

Breakup of Colloidal Aggregates by Motile Bacteria

  • Event time: 1:00pm until 2:00pm
  • Event date: 26th November 2018
  • Speaker: Samuel Griffiths (Formerly School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details

A colloidal fluid with sufficiently large attractions will undergo phase separation. With the use of two-dimensional experiments, I will show that the phase separation of attractive passive colloids is limited by the addition of active particles (motile Escherichia coli). This occurs due to activity-induced breakup of the clusters, resulting in a steady state cluster size. I will discuss how colloid-colloid attraction strength and bacterial concentration affect the resulting steady state and cluster size distribution. 

Using the same system, I will also talk about how the addition of attractive forces between a passive tracer and an active particle affects the tracer's diffusivity.

About Condensed Matter lunchtime seminars

This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..

Find out more about Condensed Matter lunchtime seminars.