Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 5, 3584 CC Utrecht, The Netherlands.
J Chem Phys. 2011 Oct 14;135(14):144106. doi: 10.1063/1.3646951.
We present a theoretical model to describe binary mixtures of semi-flexible rods, applied here to fd-virus suspensions. We investigate the effects of rod stiffness on both monodisperse and binary systems, studying thick-thin and long-short mixtures. For monodisperse systems, we find that fd-virus particles have to be made extremely stiff to even approach the behavior of rigid rods. For thick-thin mixtures, we find increasingly rich phase behavior as the rods are either made more flexible or if their diameter ratio is increased. For long-short rod mixtures we find that the phase behavior is controlled by the relative stiffness of the rods, with increasing the stiffness of the long rods or decreasing that of the short rods resulting in richer phase behavior. We also calculate the state point dependent effective shape of the rods. The flexible rods studied here always behave as shorter, thicker rigid rods, but with an effective shape that varies widely throughout the phase diagrams, and plays a key role in determining phase behavior.
我们提出了一个理论模型来描述半柔性棒的二元混合物，这里将其应用于 fd 病毒悬浮液。我们研究了棒的刚度对单分散和二元系统的影响，研究了粗细和长短混合物。对于单分散系统，我们发现 fd 病毒颗粒必须非常硬，才能接近刚性棒的行为。对于粗细混合物，随着棒变得更加柔软或直径比增加，我们发现越来越丰富的相行为。对于长短棒混合物，我们发现相行为受棒相对刚度的控制，增加长棒的刚度或减小短棒的刚度会导致更丰富的相行为。我们还计算了状态点依赖的棒的有效形状。这里研究的柔性棒总是表现为更短、更厚的刚性棒，但具有在整个相图中变化很大的有效形状，并且在确定相行为方面起着关键作用。
