Umbrella Sampling with Laser Tweezers: Measurement of the Pair Potential of Charged Colloidal Stars

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• Prof. Seth Fraden ( Brandeis University, USA)
• Tuesday 03 May 2011, 14:00-15:00
• Small Lecture Theatre, Cavendish Laboratory.

If you have a question about this talk, please contact Erika Eiser.

We report on the construction of colloidal stars: 1 μm polystyrene beads grafted with a dense brush of 1 μm long and 10 nm wide charged semiflexible filamentous viruses. The pair interaction potentials of colloidal stars are measured using an experimental implementation of umbrella sampling, a technique originally developed in computer simulations in order to probe rare events. The influence of ionic strength and grafting density on the interaction is measured. Good agreements are found between the measured interactions and theoretical predictions based upon the osmotic pressure of counterions.

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