Self-diffusion of rod-like viruses in the nematic phase

Details Self-diffusion of rod-like viruses in the nematic phase Self-diffusion of rod-like viruses in the nematic phase

2005-06-07

arxiv.org/abs/cond-mat/0506186v1

Europhy. Lett. 71, 692 (2005).

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 4 figures, to appear in Europhysics Letters

Scientific paper

10.1209/epl/i2005-10127-x

We measure the self-diffusion of colloidal rod-like virus {\it fd} in an isotropic and nematic phase. A low volume fraction of viruses are labelled with a fluorescent dye and dissolved in a background of unlabelled rods. The trajectories of individual rods are visualized using fluorescence microscopy from which the diffusion constant is extracted. The diffusion parallel ($D_{\parallel}$) and perpendicular ($D_{\perp}$) to the nematic director is measured. The ratio ($D_{\parallel}/D_{\perp}$) increases monotonically with increasing virus concentration. Crossing the isotropic-nematic phase boundary results in increase of $D_{\parallel}$ and decrease of $D_{\perp}$ when compared to the diffusion in the isotropic phase ($D_{iso}$).

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