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Liquid crystal-carbon nanotubes mixtures

机译：液晶-碳纳米管混合物

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摘要

The self-organizing properties of nematic liquid crystals (LCs) can be used to align carbon nanotubes (CNTs) dispersed in them. In the previous paper [P. van der Schoot, V. Popa-Nita, and S. Kralj, J. Phys. Chem. B 112, 4512 (2008)], we have considered the weak anchoring limit of the nematic LC molecules at the nanotube’s surface, where the CNT alignment is caused by the anisotropic interfacial tension of the nanotubes in the nematic host fluid. In this paper, we present the theoretical results obtained for strong enough anchoring at the CNT-LC interface for which the nematic ordering around nanotube is apparently distorted. Consequently, relatively strong long-range and anisotropic interactions can emerge within the system. In order to get insight into the impact of LC ordering on the alignment of nanotubes we treat the two mixture components on the same footing and combine Landau–de Gennes free energy for the thermotropic ordering of the liquid crystal and Doi free energy for lyotropic nematic ordering of carbon nanotubes caused by their mutually excluded volume. The phase ordering of the binary mixture is analyzed as a function of the volume fraction of the carbon nanotubes, the strength of coupling, and the temperature. We find that the degree of ordering of the nanorods can be tuned by raising or lowering the temperature or by increasing or decreasing their concentration.
机译：向列型液晶（LC）的自组织特性可用于排列分散在其中的碳纳米管（CNT）。在上一篇论文中[P. van der Schoot，V。Popa-Nita和S. Kralj，J。Phys。化学B 112，4512（2008）]，我们已经考虑了向列LC分子在纳米管表面的弱锚固极限，其中CNT排列是由向列主流体中纳米管的各向异性界面张力引起的。在本文中，我们给出了在碳纳米管周围的向列顺序明显扭曲的CNT-LC界面处足够牢固锚固的理论结果。因此，系统内会出现相对较强的远程和各向异性相互作用。为了深入了解LC有序化对纳米管排列的影响，我们在相同的基础上处理了两种混合物组分，并结合了Landau-de Gennes自由能和液晶的热致有序性以及Doi自由能对溶致向列的有序性碳纳米管相互排斥的体积引起的碳纳米管数量增加。根据碳纳米管的体积分数，偶联强度和温度来分析二元混合物的相序。我们发现可以通过升高或降低温度或通过增加或降低其浓度来调节纳米棒的有序度。

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