论文标题
列型 - 异分界面的主管对齐:弹性各向异性和主动锚定
Director alignment at the nematic-isotropic interface: elastic anisotropy and active anchoring
论文作者
论文摘要
在列星中的活性驱动界面流,导致优先对齐,这是延伸系统(推动器)的切向或平面,而垂直或同型或同型的收缩或同型。该比对被称为主动锚定,已报道了许多系统,并使用主动的nematic流体动力学理论进行了描述。后者基于一个弹性常数近似,即,它们假设基础被动列的弹性各向同性。然而,真正的列表具有不同的弹性常数,这导致界面锚定。在本文中,我们考虑了主动态神经的多相和多组分流体动力学模型中的弹性各向异性,并研究了由被动nematic的弹性各向异性驱动的界面比对之间的竞争。我们首先考虑具有转化不变性的系统,以分析平坦接口处的对齐方式,然后考虑二维系统和主动列液滴。我们研究了两种类型的锚定在特征系统的其他参数上的竞争。模拟的结果表明,当界面是静态时,活动锚定在非常低的活动时占主导地位。此外,我们发现弹性各向异性不会影响动力学,而会改变变为各向异性的活动长度。
Activity in nematics drives interfacial flows that lead to preferential alignment that is tangential or planar for extensile systems (pushers) and perpendicular or homeotropic for contractile ones (pullers). This alignment is known as active anchoring and has been reported for a number of systems and described using active nematic hydrodynamic theories. The latter are based on the one-elastic constant approximation, i.e., they assume elastic isotropy of the underlying passive nematic. Real nematics, however, have different elastic constants, which lead to interfacial anchoring. In this paper, we consider elastic anisotropy in multiphase and multicomponent hydrodynamic models of active nematics and investigate the competition between the interfacial alignment driven by the elastic anisotropy of the passive nematic and the active anchoring. We start by considering systems with translational invariance to analyze the alignment at flat interfaces and, then, consider two-dimensional systems and active nematic droplets. We investigate the competition of the two types of anchoring over a wide range of the other parameters that characterize the system. The results of the simulations reveal that the active anchoring dominates except at very low activities, when the interfaces are static. In addition, we found that the elastic anisotropy does not affect the dynamics but changes the active length that becomes anisotropic.