University of Cambridge > Talks.cam > BSS Formal Seminars > Umbrella Sampling with Laser Tweezers: Measurement of the Pair Potential of Charged Colloidal Stars

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

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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.

This talk is part of the BSS Formal Seminars series.

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