Two-dimensional colloidal systems in optical and magnetic fields

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• Roel Dullens, Physical and Theoretical Chemistry Laboratory, University of Oxford
• Friday 24 April 2009, 14:15-15:15
• Pippard Lecture Theatre, Cavendish Laboratory.

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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