电变形液晶网络薄膜中的渗透控制：动力学Landau理论
Controlling permeation in electrically-deforming liquid crystal network films: a dynamical Landau theory
摘要：
液晶网络利用液晶介晶的响应度之间的耦合，例如，到电场，以及聚合物网络的（粘）弹性。正因为如此，这些材料已经被提出用于广泛的应用，包括响应表面，如人造皮肤和膜。对于这样的应用，所需的功能响应通常必须在严格的几何约束下实现，例如由支撑的薄膜提供。为了模拟这样的设置，我们提出了一个动态的，空间异质性朗道型理论的电驱动液晶网络膜。我们发现，液晶网络的响应渗透的膜从上到下，并说明这如何影响与宏观变形的时间尺度。最后，通过将我们的模型参数连接到实验量，我们建议可以通过改变介晶的纵横比和它们在交联成聚合物网络时的取向顺序来控制渗透速率，为此我们预测一个单一的最佳值。我们的研究结果有助于具体的合理设计未来的应用，涉及运输或按需释放的分子货物在液晶网络膜。
英文摘要：
Liquid crystal networks exploit the coupling between the responsivity of liquid-crystalline mesogens, e.g., to electric fields, and the (visco)elastic properties of a polymer network. Because of this, these materials have been put forward for a wide array of applications, including responsive surfaces such as artificial skins and membranes. For such applications, the desired functional response must generally be realized under strict geometrical constraints, such as provided by supported thin films. To model such settings, we present a dynamical, spatially-heterogeneous Landau-type theory for electrically-actuated liquid crystal network films. We find that the response of the liquid crystal network permeates the film from top to bottom, and illustrate how this affects the time scale associated with macroscopic deformation. Finally, by linking our model parameters to experimental quantities, we suggest that the permeation rate can be controlled by varying the aspect ratio of the mesogens and their degree of orientational order when cross-linked into the polymer network, for which we predict a single optimum. Our results contribute specifically to the rational design of future applications involving transport or on-demand release of molecular cargo in liquid crystal network films.
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