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SUMMARY:Two-dimensional colloidal systems in optical and magnetic fields -
  Roel Dullens\, Physical and Theoretical Chemistry Laboratory\, University
  of Oxford
DTSTART:20090424T131500Z
DTEND:20090424T141500Z
UID:TALK17214@talks.cam.ac.uk
CONTACT:Kevin Chalut
DESCRIPTION:Colloidal systems are widely used as a model system to study m
 any\nfundamental issues in condensed matter physics and statistical mechan
 ics.\nThe great advantage is that the colloidal time- and length scales ar
 e\nexperimentally very well accessible. In addition\, colloidal systems ca
 n be\nreadily manipulated using for example optical tweezers\, magnetic an
 d\nelectric fields. In this presentation\, I will highlight various experi
 ments\nthat illustrate the unique properties of colloids. The main part of
  the talk\nwill be about experiments in which we used optical tweezers dra
 g a large\nprobe particle through a two-dimensional colloidal crystal of s
 maller\nparticles. Here we varied the orientation with respect to the crys
 tal axis\nand the drag-speed. Finally\, I also will show some very recent 
 work on\ncrystallization and column-formation in confined magnetic systems
 .
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory
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