碳纳米管客体在胶体病毒棒悬浮液中的取向有序性
Orientational order of carbon nanotube guests in a nematic host suspension of colloidal viral rods
摘要：
为了研究二元双分散体系中细长粒子取向度之间的耦合关系，将表面活性剂稳定的单壁碳纳米管（CNTs）加入到胶体杆状病毒的双分散体系中，利用偏振拉曼光谱和光学双折射分别测量了主客体体系中两组分的取向序参量.因此，我们的系统允许我们探测客体颗粒（CNT）比FD病毒宿主颗粒更短更薄的情况。我们表明，在整个碳纳米管的顺序度是系统小于FD病毒颗粒的。这些测量结果与Onsager型第二病毒理论的预测非常一致，该理论明确包括病毒颗粒的灵活性和CNT的多分散性。
英文摘要：
In order to investigate the coupling between the degrees of alignment of elongated particles in binary nematic dispersions, surfactant stabilized single-wall carbon nanotubes (CNTs) have been added to nematic suspensions of colloidal rodlike viruses in aqueous solution.We have independently measured the orientational order parameter of both components of the guest-host system by means of polarized Raman spectroscopy and by optical birefringence, respectively. Our system allows us therefore to probe the regime where the guest particles (CNTs) are shorter and thinner than the fd virus host particles. We show that the degree of order of the CNTs is systematically smaller than that of the fd virus particles for the whole nematic range. These measurements are in good agreement with predictions of an Onsager-type second-viral theory, which explicitly includes the flexibility of the virus particles, and the polydispersity of the CNTs.
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