Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-10-08
Physics
Condensed Matter
Soft Condensed Matter
5 pages, 3 figures. Changed content
Scientific paper
10.1103/PhysRevLett.102.108302
We report on the construction of colloidal stars: 1 micrometer polystyrene beads grafted with a dense brush of 1 micrometer long and 10 nm wide semi-flexible 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.
Addas K.
Dogic Zvonimir
Flynn N. T.
Fraden Seth
Hagan Michael F.
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