Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2000-03-27
J. Chem. Phys. 113, 8368 (2000)
Physics
Condensed Matter
Soft Condensed Matter
Submitted to J. Chem. Phys. See related webpage http://www.elsie.brandeis.edu
Scientific paper
10.1063/1.1308107
In the first part of this paper, an approximate theory is developed for the leading order concentration dependence of the sedimentation coefficient for rod-like colloids/polymers/macromolecules. To first order in volume fraction $\phi$ of rods, the sedimentation coefficient is written as $1+\alpha \phi$. For large aspect ratio L/D (L is the rod length, D it's thickness) $\alpha$ is found to very like $\propto (\frac{L}{D})^2/\log (\frac{L}{D})$. This theoretical prediction is compared to experimental results. In the second part, experiments on {\it fd}-virus are described, both in the isotropic and nematic phase. First order in concentration results for this very long and thin (semi-flexible) rod are in agreement with the above theoretical prediction. Sedimentation profiles for the nematic phase show two sedimentation fronts. This result indicates that the nematic phase becomes unstable with the respect to isotropic phase during sedimentation.
Dhont Jan K. G.
Dogic Zvonimir
Fraden Seth
Philipse Albert P.
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