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首页> 外文期刊>Advanced Functional Materials >Combined Light and Electric Response of Topographic Liquid Crystal Network Surfaces
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Combined Light and Electric Response of Topographic Liquid Crystal Network Surfaces

机译：地形液晶网络表面的光和电响应相结合

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摘要

An approach is proposed to create robust liquid crystalline polymer coatings that exhibit sensitivity and dynamic reversibility toward multiple external stimuli including UV irradiation and electrical input. This coating spontaneously alters its surface topographic texture and thickness in response to each of these signals. The corresponding deformations are induced by the photo-/electromechanical properties and dielectric anisotropy in the liquid crystal networks through order parameter reduction and anisotropic volume expansions. The deformation proceeds fast within several seconds both for activation and for the relaxation to the initial state upon switching the trigger(s) on and off. Light and electric field can be applied independently to excite the topographies or in a synergistic manner to enhance the deformation amplitude. Upon elimination of the combined light and electric actuating trigger, the relaxation to the initial close to flat state follows a complex pathway. Depending on the elimination order the topographic structure can be rapidly erased or can be kept in a bistable state. The results of this study are relevant for various fields, for instance, switchable controlled friction, controlled adhesion, and release of objects and haptics where they affect human perception both in passive and dynamic manner.
机译：提出了一种创建坚固的液晶聚合物涂层的方法，该涂层对包括紫外线辐射和电输入在内的多种外部刺激具有敏感性和动态可逆性。响应于这些信号中的每一个，该涂层自发地改变其表面形貌纹理和厚度。相应的变形是由液晶网络中的光/机电特性和介电各向异性引起的，这些变形是通过阶数参数减小和各向异性体积膨胀来实现的。变形在几秒钟之内快速进行，无论是激活还是打开或关闭扳机都可放松到初始状态。可以独立施加光和电场以激发形貌，或以协同方式施加以增强形变幅度。在消除组合的光和电致动触发器之后，松弛到初始接近平坦的状态遵循复杂的路径。根据消除顺序，可以快速擦除地形结构或将其保持在双稳态。这项研究的结果与各个领域相关，例如，可切换的受控摩擦，受控的附着力以及物体和触觉的释放，它们以被动和动态方式影响人类的感知。

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