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Mesoscale dynamics and cooperativity of networking dendronized nonlinear optical molecular glasses

机译：网络化树状非线性光学分子玻璃的介观动力学和协同性

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摘要

First, molecular scale insight into the mobility of a novel class of organic materials for photonic applications with electro-optical activities larger than 300 pm/V is presented. A representative second order nonlinear optical (NLO) material of this class of self-assembling molecular glasses involving quadrupolar phenyl-perfluorophenyl (Ph-Ph-F) interactions is analyzed based on its molecular relaxation phenomena and phase behavior. Thereby, a new and straightforward nanoscale methodology, involving shear modulation force microscopy and intrinsic friction analysis is introduced. It provides both the submolecular enthalpic and entropic dynamics in nanoconstrained systems (e.g., ultrathin films), and thus, insight into local motion of single molecules due to dissociation of Ph-PhF pairs as well as the cooperative dynamics of the assembled network. This nanoscale model-independent thermomechanical methodology is shown to be very effective in fundamentally evaluating appropriate poling conditions of organic NLO materials. It promises to be a straightforward analysis tool to guide organic material synthesis from a molecular mobility perspective, particularly for applications that impose nanoscale constraints on the system.
机译：首先，介绍了分子级的洞察力，该洞察力用于电光活性大于300 pm / V的新型光子应用有机材料的迁移率。基于其分子弛豫现象和相行为，分析了这类涉及四极苯基-全氟苯基（Ph-Ph-F）相互作用的自组装分子玻璃的代表性二阶非线性光学（NLO）材料。因此，介绍了一种新的，直接的纳米级方法，涉及剪切调制力显微镜和固有摩擦分析。它提供了纳米约束系统（例如超薄膜）中的亚分子焓和熵动力学，因此可以洞悉由于Ph-PhF对解离而引起的单个分子的局部运动以及组装网络的协同动力学。这种与纳米模型无关的热机械方法被证明在从根本上评估有机NLO材料的适当极化条件方面非常有效。它有望成为一个从分子迁移率的角度指导有机材料合成的简单分析工具，尤其是对系统施加纳米级约束的应用。

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