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首页> 外文期刊>RSC Advances >Difference in the interaction of nano-diameter rod and tubular particles with a disclination line in a nematic liquid crystal
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Difference in the interaction of nano-diameter rod and tubular particles with a disclination line in a nematic liquid crystal

机译：纳米直径杆和管状颗粒与向列液晶中的优化线相互作用的差异

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In the presence of a disclination line, inclusions within an aligned nematic liquid crystal (LC) are first attracted and ultimately trapped in it. The kind of orientational distortion created by the inclusions is fundamental in determining the trapping. In the present work, we observe differences in the trapping behaviour, onto a ? defect line in a nematic LC, of two types of particles both elongated but different in their actual geometry. Even if both types have cylindrical shape, aggregates of Mo _(6) S _(2) I _(8) nanowires (rod-like shape) and multiwall carbon nanotubes (tubular shape, i.e. hollow) trap differently although still due to deformations induced in the LC director field. Attractive forces are stronger on elongated bundles of nanowires than on similarly sized bundles of multi-wall carbon nanotubes. The reason is the difference in the attraction forces originating from different types of distortions of the LCs. The hollow and the full cylinders are not homotopically equivalent and this inequivalence holds also for the liquid crystal around them. The nanowires induce defects in the LC close-by their surfaces as shown for microrods, topologically equivalent to spheres. In contrast, multi-wall carbon nanotubes, being hollow, do not form defects close to their ends. However, the tubes are strongly bent and the strong planar anchoring of LC at the surface induces deformation in the LC enabling attraction forces with the defect line. HiPco single wall carbon nanotubes could not be trapped because their bundles looked much straighter and smaller than the ones of MWCNTs and thus neither defects nor standard strong deformations are expected. In conclusion, even if the shape of both types of particles is cylindrical, the topological difference between rods and tubes has profound consequences on the physical behaviour and on the presence and type of defect-mediated nematic attraction forces.
机译：在存在公开线的存在下，首先将对齐的向列液晶（LC）内的夹杂物吸引并最终被困在其中。由夹杂物产生的取向失真的种类是确定捕获的基础。在目前的工作中，我们观察捕获行为的差异，进入a？缺陷LC中的缺陷线，两种类型的颗粒在其实际几何形状中伸长，但不同。即使两种类型都有圆柱形，Mo _（6）S _（2）I _（8）纳米线（杆状形状）和多壁碳纳米管（管状形状，即空心）陷阱的聚集体也不同，尽管仍然是由于变形在LC导演领域引发。在纳米线的细长束上具有比同样大小的多壁碳纳米管束更强的有吸引力的力量。原因是源自LCS的不同类型扭曲的吸引力的差异。中空和全汽缸不是同型同性量的，并且这种不平等性也适用于它们周围的液晶。纳米线诱导LC闭合的缺陷，如微孔所示，拓扑相当于球体。相反，是空心的多壁碳纳米管不形成靠近其端部的缺陷。然而，管道强烈弯曲，并且在表面上的LC的强平面锚固在LC中引起变形，使得具有缺陷线的吸引力。 Hipco单壁碳纳米管不能被困，因为它们的束看起来远如此紧张，而不是MWCNT，因此预期缺陷也没有标准的强烈变形。总之，即使两种类型的颗粒的形状是圆柱形的，杆和管之间的拓扑差异也对物理行为的影响和缺陷介导的向列的存在和类型的影响。

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