电变形液晶网络的瞬态响应和畴形成
Transient response and domain formation in electrically deforming liquid crystal networks
摘要：
最近，Van der Kooij及其同事在电变形液晶网络的动力学中认识到三种不同的瞬态状态[Van der Kooij等人，国家通信10，1（2019）]。基于朗道理论框架，其中包括空间分辨的信息，我们解释这些制度：最初，响应主要是由热噪声，然后顶部的膜膨胀，随后渗透到散装的响应。这种解释的一个重要的签名是一个显着的依赖关系的制度的时间尺度上的薄膜厚度，我们观察到一个明确的薄膜到散装过渡。转变点与主体中空间不均匀性的出现相一致，即，域形成，并且由于其引起的较不可预测的稳态膨胀而应避免。最后，我们表明，这种域的形成可以抑制通过降低膜的初始厚度，并增加的介晶的线性尺寸，或它们的取向顺序时，交联成网络，虽然这是在成本的变形幅度。我们的研究结果有助于实现更精细的控制如何智能液晶网络涂层被激活。
英文摘要：
Recently, Van der Kooij and co-workers recognised three distinct, transient regimes in the dynamics of electrically-deforming liquid crystal networks [Van der Kooij et al., Nat. Commun. 10, 1 (2019)]. Based on a Landau-theoretical framework, which encompasses spatially resolved information, we interpret these regimes: initially, the response is dominated by thermal noise, then the top of the film expands, followed by a permeation of this response into the bulk. An important signature of this interpretation is a significant dependence of the regime time scales on film thickness, where we observe a clear thin-film-to-bulk transition. The point of transition coincides with the emergence of spatial inhomogeneities in the bulk, i.e., domain formation, and should be avoided due to the less predictable steady-state expansion it gives rise to. Finally, we show that this domain formation can be suppressed by decreasing the initial thickness of the film, and increasing the linear dimensions of the mesogens, or their orientational order when crosslinked into the network, though this comes at the cost of the deformation magnitude. Our results contribute to achieving finer control over how smart liquid crystal network coatings are activated.
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