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BEGIN:VEVENT
DTSTAMP:20260627T152021Z
DTSTART;VALUE=DATE-TIME:20140319T150000
DTEND;VALUE=DATE-TIME:20140319T160000
SUMMARY:Departmental Colloquium L4
TZID:Europe/London
UID:20140319-094d43d5449315f60144ab41fd8c26db@warwick.ac.uk
CREATED:20140310T091032Z
DESCRIPTION:Time-evolution scenario for short-range depletion gels subjec
 ted to the gravitational stress Roberto Piazza\, Department of Chemistry
 \, Material Science\, and Chemical Engineering “G. Natta” Politecnico di
  Milano When the attractive forces induced by the presence of a high mol
 ecular weight additive acting as depletant become strong enough\, a coll
 oidal suspension undergoes a liquid–liquid (L-L) phase separation that\,
  if the depletion forces are sufficiently short-ranged compared to the s
 ize of the colloidal usually gets arrested by the formation of a disorde
 red colloidal solid with a gel-like structure. I shall present a survey 
 of the experimental results on the settling and restructuring dynamics o
 f colloidal gels obtained by Photon Correlation Imaging and Ghost Partic
 le Velocimetry\, two novel optical correlation techniques particularly s
 uited to the investigation of the microscopic dynamics of spatially hete
 rogeneous samples. Three distinct regions can be set apart within the L-
 L coexistence region of the phase diagram. When depletion forces are bar
 ely sufficient to drive the system within the metastable region\, an ini
 tial disordered gel hosts the rapid nucleation of crystallites\, which s
 tress the gel structure until it fully collapses\, leading to the format
 ion of a macroscopic colloidal crystal. For stronger attractive forces\,
  two distinct scenarios are observed\, depending on the particle volume 
 fraction Ď•0 of the original suspension. At low Ď•0\, the gel breaks after
  a short delay time into separate clusters\, which rapidly settle until 
 they compact in a denser disordered phase. The latter eventually undergo
 es a slow compression\, which is accounted for by a “poroelastic” model 
 where the microscopic gel dynamics is fully ruled by its macroscopic def
 ormation. Yet\, it is the intermediate stage between cluster settling an
 d final compaction which displays very peculiar features\, evidenced by 
 anomalous settling profiles which are totally unusual in standard colloi
 dal sedimentation processes. For larger values of Ď•0\, gel breaking is c
 onversely suppressed\, the structure undergoes a continuous compression\
 , and the microscopic dynamics is characterized by logarithmic time-corr
 elation functions resembling those found for attractive glasses.
LOCATION:
CATEGORIES:Departmental Colloquium
LAST-MODIFIED:20140310T091032Z
ORGANIZER;CN=Kayleigh Lampard:
END:VEVENT
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