Dogic Zvonimir, Purdy Kirstin R, Grelet Eric, Adams Marie, Fraden Seth
Complex Fluids Group, Physics Department, Brandeis University, Waltham, Massachusetts 02454, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2004 May;69(5 Pt 1):051702. doi: 10.1103/PhysRevE.69.051702. Epub 2004 May 14.
We present an experimental study of the isotropic-nematic phase transition in an aqueous mixture of charged semiflexible rods ( fd virus) and neutral polymer (Dextran). A complete phase diagram is measured as a function of ionic strength and polymer molecular weight. At high ionic strength we find that adding polymer widens the isotropic-nematic coexistence region with polymers preferentially partitioning into the isotropic phase, while at low ionic strength the added polymer has no effect on the phase transition. The nematic order parameter is determined from birefringence measurements and is found to be independent of polymer concentration (or equivalently the strength of attraction). The experimental results are compared with the existing theoretical predictions for the isotropic-nematic transition in rods with attractive interactions.
我们展示了一项关于带电半柔性棒（fd病毒）与中性聚合物（右旋糖酐）的水性混合物中各向同性-向列相转变的实验研究。测量了作为离子强度和聚合物分子量函数的完整相图。在高离子强度下，我们发现添加聚合物会拓宽各向同性-向列共存区域，聚合物优先分配到各向同性相中，而在低离子强度下，添加的聚合物对相变没有影响。向列序参数由双折射测量确定，发现其与聚合物浓度（或等效的吸引力强度）无关。将实验结果与具有吸引相互作用的棒中各向同性-向列转变的现有理论预测进行了比较。
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