Some Optical Tweezers-Based Rheology Conclusions, and a New Microscopy Technique

Condensed Matter lunchtime seminar

Some Optical Tweezers-Based Rheology Conclusions, and a New Microscopy Technique

  • Event time: 1:00pm
  • Event date: 1st September 2008
  • Speaker: Laurence Wilson (Formerly School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details

I am going to present a summary of the colloid work that I've been doing for the last four years or so, including comparison with other simulations and experiments - some of the conclusions are quite surprising. Secondly, I'll speak about a new technique that I've been developing, based on a Phys. Rev. Lett. by Cerbino and Trappe earlier this year. Video microscopy sequences are examined, in order to shed light on the diffusive behaviour of suspensions; the technique shares some aspects with dynamic light scattering - that is to say, I do not use particle tracking. This approach has great promise as a tool in the biological arena, for measuring motility and diffusion.} }

%@meeting{html, % date = {23 Jun 2008}, % speaker ={Wilson Poon}, % title={How many kinds of colloidal gels are there?}, % abstract={I propose a unified description of the gelation of spherical % colloids interacting with isotropic, short-range attraction. The % proposal is supported by a large range of literature data on structure, % time evolution and rheology, published by us and others. Recent reanalysis % of our own work on delayed sedimentation as well as simulations done in % collaboration with the group in Rome provide further evidence for the % correctness of my proposed scheme, which predicts that there are of the % order of 10 different kinds of colloidal gels possible even in such an % apparently simple system.

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..

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