Colloidal glasses under shear

Condensed Matter lunchtime seminar

Colloidal glasses under shear

  • Event time: 1:00pm
  • Event date: 1st August 2005
  • Speaker: Nhan Pham (Formerly School of Physics & Astronomy, University of Edinburgh)
  • Location: Room 2511,

Event details

It has been shown that colloidal suspensions of hard spheres with short-range attraction show two different glassy states: the hard-sphere like glass and attractive glass where the mechanisms for structural arrest are different [1]. Under shear the hard sphere glass first distorts elastically, then yields and flows on increasing the applied strain. This behaviour can be associated with distortion, then breaking, of the neighbour cages which localise each particle in the suspension [2]. This talk will emphasise recent studies of the rheology of the attractive glass. In contrast to repulsive glasses, we find that attractive glasses exhibit a two-stage yielding process as the applied strain is increased. A tentative explanation for these observations will be given in terms of the microstructure of the suspension.

[1] K.N. Pham et al., Science 296 (2002); Phys. Rev. E 69 (2004)

[2] G. Petekidis et al., Phys. Rev. E 66 (2002); Faraday Discussions 123 (2003); J. Phys.: Condens. Matter 16 (2004)

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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