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arXiv 1306.5430cond-mat.soft
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刚性病毒杆近晶相的动力学

Dynamics in the smectic phase of stiff viral rods

Emilie Pouget, Eric Grelet, M. Paul Lettinga

摘要:

我们报告的动力学在胶体悬浮液的刚性病毒杆,称为FD-Y21 M。该突变丝状病毒表现出比野生型fd-wt大3.5倍的持久长度。这样的病毒系统可以用作杆状粒子的模型系统,用于研究它们的自扩散。在本文中,物理特性,如杆轮廓长度和多分散性已被确定为两种病毒。病毒杆的灵活性的向列-近晶相变的位置上的效果进行了研究,重点是在近晶相更具体地研究的基本动力学。在单个颗粒的尺度下直接可视化刚性fd-Y21 M已经显示了相邻近晶层之间的质量传输,如先前对于更柔性的棒所发现的。我们可以将这种受阻扩散与近晶有序势不同棒浓度。与更柔性的fd-wt病毒棒相比,对于刚性棒,层内的自扩散更加显著。

英文摘要:

We report on the dynamics in colloidal suspensions of stiff viral rods, called fd-Y21M. This mutant filamentous virus exhibits a persistence length 3.5 times larger than the wild-type fd-wt. Such a virus system can be used as a model system of rodlike particles for studying their self-diffusion. In this paper, the physical features, such as rod contour length and polydispersity have been determined for both viruses. The effect of viral rod flexibility on the location of the nematic-smectic phase transition has been investigated, with a focus on the underlying dynamics studied more specifically in the smectic phase. Direct visualization of the stiff fd-Y21M at the scale of a single particle has shown the mass transport between adjacent smectic layers, as found earlier for the more flexible rods. We could relate this hindered diffusion with the smectic ordering potentials for varying rod concentrations. The self-diffusion within the layers is far more pronounced for the stiff rods as compared to the more flexible fd-wt viral rod.

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