Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2009-08-05
Physics
Condensed Matter
Soft Condensed Matter
13 pages, 14 figures. accepted in Phsical Review E
Scientific paper
The kinetics of isotropic-nematic (I-N) and nematic-isotropic (N-I) phase transitions in dispersions of rod-like {\it fd}-viruses are studied. Concentration quenches were applied using pressure jumps in combination with polarization microscopy, birefringence and turbidity measurements. The full biphasic region could be accessed, resulting in the construction of a first experimental analogue of the bifurcation diagram. The N-I spinodal points for dispersions of rods with varying concentrations of depletion agents (dextran) were obtained from orientation quenches, using cessation of shear flow in combination with small angle light scattering. We found that the location of the N-I spinodal point is independent of the attraction, which was confirmed by theoretical calculations. Surprisingly, the experiments showed that also the absolute induction time, the critical nucleus and the growth rate are insensitive of the attraction, when the concentration is scaled to the distance to the phase boundaries.
Holmqvist Peter
Lettinga Paul M.
Meier Guido
Ratajczyk M.
Wensink H. H.
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