Science and Engineering at The University of Edinburgh

Soft Condensed Matter, Biological Physics Experiment & Statistical Physics Seminars

Explanatory note

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.

Speakers should read this note

Week beginning 29 May 2016

Monday 30 May 16 - 1:00pm - Room 2511

Dynamic shear jamming in dense suspensions

Ivo Peters (University of Southampton)

Shear a dense suspension of cornstarch and water hard enough, and the system seems to solidify as a result. Indeed, previous studies have shown that a jamming front propagates through these systems until, after interaction with boundaries, a jammed solid spans across the system. Because these fully jammed states are only observed if the deformation is fast enough, a natural question to ask is how this phenomenon is related to the discontinuous shear thickening (DST) behavior of these suspensions. We present a single experimental setup in which we on the one hand can measure the rheological flow curves, but on the other hand also determine if the suspension is in a jammed state. This we do by using a large-gap cylindrical Couette cell, where we control the applied shear stress using a rheometer. Because our setup only applies shear, the jammed states we observe are shear-jammed, and cannot be a result of an overall increase in packing fraction. We probe for jammed states by dropping small steel spheres on the surface of the suspension, and identify elastic responses. Our experiments reveal a clear distinction between the onset of DST and Shear-Jammed states, which have qualitatively different trends with packing fraction close to the isotropic jamming point.

Upcoming meetings

Monday 6 Jun 16 - 1:00pm - Room 2511

To be confirmed

Michael Nicholson (University of Edinburgh)

Monday 13 Jun 16 - 1:00pm - Room 2511

To be confirmed

Teun Vissers

Monday 20 Jun 16 - 1:00pm - Room 2511

To be confirmed

Tannie Liverpool (University of Bristol)

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Note for speakers

  • We try to encourage an informal atmosphere.
  • To encourage discussion, talks are limited to 30/40 mins plus up to 20/10 mins for questions.
  • Almost any style of talk is allowed and resident speakers are encouraged to give a variety of different types of talk during their stay at Edinburgh. Examples include talks about the speaker's research, a particular paper or publication (`Journal Club' talks), pedagogical talks, question-and-answer sessions, etc.
  • Speakers are encouraged to pitch their seminars to the whole group.
  • I would be grateful if the next speaker on the list could inform me of the title and short abstract (it should fit onto the usual advertising poster) of his/her talk by Wednesday of the week before, to allow me to do the advertising.
  • Anyone unable to give their talk on the scheduled date should in the first instance try to rearrange with someone else on the list, and only then inform me of the final outcome so that I can change the rota.
  • Talks of soft condensed matter students can only be cancelled with permission from Prof. Cates, and should be done as far in advance as possible to give some chance of finding a replacement.
  • If anyone would like to volunteer a seminar themselves, knows of a visitor or new arrival who might be willing to give a talk, or for any other queries, please contact the seminar organiser (see below for email address).