Flow behavior of colloidal rod-like viruses in the nematic phase

Details Flow behavior of colloidal rod-like viruses in the nematic phase Flow behavior of colloidal rod-like viruses in the nematic phase

2005-06-07

arxiv.org/abs/cond-mat/0506182v1

Langmuir 21, 8048 (2005).

Physics

Condensed Matter

Soft Condensed Matter

13 pages, 12 figures, to appear in Langmuir

Scientific paper

The behavior of a colloidal suspension of rod-like {\it fd} viruses in the nematic phase, subjected to steady state and transient shear flows is studied. The monodisperse nature of these rods combined with relatively small textural contribution to the overall stress make this a suitable model system to investigate the effects of flow on the non-equilibrium phase diagram. Transient rheological experiments are used to determine the critical shear rates at which director tumbling, wagging and flow-aligning occurs. The present model system enables us to study the effect of rod concentration on these transitions. The results are in quantitatively agreement with the Doi-Edwards-Hess model. Moreover, we observe that there is a strong connection between the dynamic transitions and structure formation, which is not incorporated in theory.

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