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首页> 外文会议>Emerging liquid crystal technologies X >Surface dynamics and mechanics in liquid crystal polymer coatings
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Surface dynamics and mechanics in liquid crystal polymer coatings

机译：液晶聚合物涂料的表面动力学和力学

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摘要

Based on liquid crystal networks we developed 'smart' coatings with responsive surface topographies. Either by pre-patterning or by the formation of self-organized structures they can be switched on and off in a pre-designed manner. Here we provide an overview of our methods to generate coatings that form surface structures upon the actuation by light. The coating oscillates between a flat surface and a surface with pre-designed 3D micro-patterns by modulating a light source. With recent developments in solid state lighting, light is an attractive trigger medium as it can be integrated in a device for local control or can be used remotely for flood or localized exposure. The basic principle of formation of surface topographies is based on the change of molecular organization in ordered liquid crystal polymer networks. The change in order leads to anisotropic dimensional changes with contraction along the director and expansion to the two perpendicular directions and an increase in volume by the formation of free volume. These two effects work in concert to provide local expansion and contraction in the coating steered by the local direction of molecular orientation. The surface deformation, expressed as the height difference between the activated regions and the non-activated regions divided by the initial film thickness, is of the order of 20%. Switching occurs immediately when the light is switched 'on' and 'off' and takes several tens of seconds.
机译：基于液晶网络，我们开发了具有灵敏表面形貌的“智能”涂料。通过预先构图或通过自组织结构的形成，它们可以以预先设计的方式打开和关闭。在此，我们概述了我们的生成涂层的方法，这些涂层在光线驱动下会形成表面结构。涂层通过调制光源在平坦表面和具有预先设计的3D微图案的表面之间振荡。随着固态照明的最新发展，光是诱人的触发介质，因为它可以集成在用于本地控制的设备中，也可以远程用于泛光或局部曝光。形成表面形貌的基本原理是基于有序液晶聚合物网络中分子组织的变化。顺序的变化导致各向异性的尺寸变化，沿着指向矢的收缩和向两个垂直方向的膨胀，以及由于形成自由体积而导致体积增加。这两个作用协同作用，以在由分子取向的局部方向控制的涂层中提供局部膨胀和收缩。表面变形表示为活化区域和非活化区域之间的高度差除以初始膜厚度，约为20％。当灯光“打开”和“关闭”时，切换立即发生，并且需要数十秒钟。

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  • 来源
    《Emerging liquid crystal technologies X》|2015年|938406.1-938406.9|共9页
  • 会议地点 San Francisco CA(US)
  • 作者

    Danqing Liu; Dirk J. Broer;

  • 作者单位

    Group Functional Organic Materials Devices (SFD), Department of Chemical Engineering Chemistry, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands;

    Group Functional Organic Materials Devices (SFD), Department of Chemical Engineering Chemistry, Eindhoven University of Technology, Den Dolech 2, 5612 AZ Eindhoven, The Netherlands,Institute for Complex Molecular Systems (ICMS), P.O. Box 513, 5600 MB Eindhoven, The Netherlands;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    liquid crystal polymer networks; surface topographies; dynamic; self-organizing; reversible;

    机译：液晶聚合物网络；表面形貌;动态;自组织可逆的;

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