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SUMMARY:Umbrella Sampling with Laser Tweezers: Measurement of the Pair Pot
 ential of Charged Colloidal Stars - Prof. Seth Fraden ( Brandeis Universit
 y\, USA)
DTSTART:20110503T130000Z
DTEND:20110503T140000Z
UID:TALK31226@talks.cam.ac.uk
CONTACT:Erika Eiser
DESCRIPTION:We report on the construction of colloidal stars: 1 μm polyst
 yrene beads grafted with a dense brush of 1 μm long and 10 nm wide charge
 d semiflexible filamentous viruses. The pair interaction potentials of col
 loidal stars are measured using an experimental implementation of umbrella
  sampling\, a technique originally developed in computer simulations in or
 der to probe rare events. The influence of ionic strength and grafting den
 sity on the interaction is measured. Good agreements are found between the
  measured interactions and theoretical predictions based upon the osmotic 
 pressure of counterions.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory
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