具有附加吸引力的杆状病毒的过饱和分散体
Supersaturated dispersions of rod-like viruses with added attraction
摘要：
本文研究了棒状{ \it fd}病毒分散体系中各向同性-向列相（I-N）和向列相-各向同性（N-I）的相变动力学。浓度猝灭应用于结合偏振显微镜，双折射和浊度测量的压力跳跃。完整的双相区可以访问，导致在建设的第一个实验模拟的分叉图。具有不同浓度的耗尽剂（葡聚糖）的棒的分散体的N-I旋节点从取向猝灭获得，使用剪切流的停止结合小角度光散射。我们发现N-I旋节点的位置与引力无关，这一点得到了理论计算的证实。令人惊讶的是，实验表明，绝对诱导时间，临界核和生长速率也是不敏感的吸引力，当浓度缩放到相边界的距离。
英文摘要：
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.
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