Two-dimensional colloidal systems in optical and magnetic fields
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If you have a question about this talk, please contact Kevin Chalut.
Colloidal systems are widely used as a model system to study many
fundamental issues in condensed matter physics and statistical mechanics.
The great advantage is that the colloidal time- and length scales are
experimentally very well accessible. In addition, colloidal systems can be
readily manipulated using for example optical tweezers, magnetic and
electric fields. In this presentation, I will highlight various experiments
that illustrate the unique properties of colloids. The main part of the talk
will be about experiments in which we used optical tweezers drag a large
probe particle through a two-dimensional colloidal crystal of smaller
particles. Here we varied the orientation with respect to the crystal axis
and the drag-speed. Finally, I also will show some very recent work on
crystallization and column-formation in confined magnetic systems.
This talk is part of the BSS Formal Seminars series.
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Roel Dullens, Physical and Theoretical Chemistry Laboratory, University of Oxford
Friday 24 April 2009, 14:15-15:15