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SUMMARY:Soft particle liquids - Dr David Heyes\, Division of Chemistry\, U
 niversity of Surrey
DTSTART:20060519T100000Z
DTEND:20060519T110000Z
UID:TALK4956@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:Our characterisation and understanding of the physical propert
 ies of many complex liquids\, such as colloids and polymers has improved i
 n recent years. One aspect of these systems that distinguishes them from s
 mall molecules is the nature of the interparticle interaction. The interac
 tion can range from being extremely hard to being extremely soft. In this 
 talk I will focus on the effects of softness on the physical properties of
  these meso-particulate systems. This includes the thermodynamic\, structu
 ral and transport behaviour. The results are partly from theory and partly
  from molecular dynamics simulation of a model soft particle fluid\, using
  a generalised soft-sphere potential &#966\;(r)=&#949\;(&#963\;/r)n\, wher
 e the exponent\, n is a variable which can be used to tune the softness of
  the particles. Model liquids with n ranging from 4 to 1152 were chosen to
  cover the transition\, respectively\, from very soft (i.e. polymer-like) 
 to very stiff (i.e.\, large colloid) particles. Statistical mechanical the
 ory and Molecular Dynamics simulations have been used to help provide an u
 nderstanding and the first steps towards a theoretical description of thes
 e systems. Results of this on-going work also include the viscosity and sh
 ear stress relaxation function\, and elastic constants.
LOCATION:Open Plan Area\, BP Institute\, Madingley Rise CB3 0EZ
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