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首页> 外文期刊>Journal of Applied Physics >Dynamically morphing microchannels in liquid crystal elastomer coatings containing disclinations
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Dynamically morphing microchannels in liquid crystal elastomer coatings containing disclinations

机译：在含有公开的液晶弹性体涂层中动态地变形微通道

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摘要

Liquid crystal elastomers (LCEs) hold a major promise as a versatile material platform for smart soft coatings since their orientational order can be predesigned to program a desired dynamic profile. In this work, we introduce temperature-responsive dynamic coatings based on LCEs with arrays of singular defects-disclinations that run parallel to the surface. The disclinations form in response to antagonistic patterns of the molecular orientation at the top and bottom surfaces, imposed by the plasmonic mask photoalignment. Upon heating, an initially flat LCE coating develops linear microchannels located above each disdination. The stimulus that causes a non-flat profile of LCE coatings upon heating is the activation force induced by the gradients of molecular orientation around disclinations. To describe the formation of microchannels and their thermal response, we adopt a Frank-Oseen model of disclinations in a patterned director field and propose a linear elasticity theory to connect the complex spatially varying molecular orientation to the displacements of the LCE. The thermo-responsive surface profiles predicted by the theory and by the finite element modeling are in good agreement with the experimental data; in particular, higher gradients of molecular orientation produce a stronger modulation of the coating profile. The elastic theory and the finite element simulations allow us to estimate the material parameter that characterizes the elastomer coating's response to the thermal activation. The disdination-containing LCEs show potential as soft dynamic coatings with a predesigned responsive surface profile.
机译：液晶弹性体（LCE）保持主要的希望作为智能软涂层的多功能材料平台，因为它们可以预测其定义顺序以编程期望的动态型材。在这项工作中，我们基于具有奇异缺陷阵列的LCE引入温度响应动态涂层 - 公开的平行于表面延伸。响应于顶表面和底表面的分子取向的拮抗图案，通过等离子体掩模光学施加的拮抗图案形成。在加热时，最初平坦的LCE涂层在每个乳化上方发育线性微通道。在加热时导致LCE涂层非平坦曲线的刺激是由围绕公开的分子取向的梯度引起的激活力。为了描述微通道的形成及其热响应，我们采用了图案化导演领域的坦率 - OSEEN展示模型，并提出了线性弹性理论，将复杂的空间变化的分子取向连接到LCE的位移。由理论和有限元建模预测的热响应表面谱与实验数据吻合良好;特别地，较高梯度的分子取向产生涂层轮廓的更强调节。弹性理论和有限元模拟允许我们估计表征弹性体涂层对热激活的反应的材料参数。含有含有的含有DININITITE的LCE潜在的柔软动态涂层，具有预测的响应表面轮廓。

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  • 来源
    《Journal of Applied Physics》 |2020年第18期|184702.1-184702.13|共13页
  • 作者

    Greta Babakhanova; Youssef M. Golestani; Hend Baza; Sajedeh Afghah; Hao Yu; Michael Varga; Qi-Huo Wei; Paul Shiller; Jonathan V. Selinger; Robin L B. Selinger; Oleg D. Lavrentovich;

  • 作者单位

    Advanced Materials and Liquid Crystal Institute Kent Ohio 44242 USA Materials Science Graduate Program Kent State University Kent Ohio 44242 USA;

    Advanced Materials and Liquid Crystal Institute Kent Ohio 44242 USA Materials Science Graduate Program Kent State University Kent Ohio 44242 USA;

    Department of Physics Kent State University Kent Ohio 44242 USA;

    Department of Physics Kent State University Kent Ohio 44242 USA;

    Advanced Materials and Liquid Crystal Institute Kent Ohio 44242 USA Materials Science Graduate Program Kent State University Kent Ohio 44242 USA;

    Advanced Materials and Liquid Crystal Institute Kent Ohio 44242 USA Materials Science Graduate Program Kent State University Kent Ohio 44242 USA;

    Advanced Materials and Liquid Crystal Institute Kent Ohio 44242 USA Materials Science Graduate Program Kent State University Kent Ohio 44242 USA;

    Civil Engineering-Timken Engineered Surface Laboratory The University of Akron Akron Ohio 44325 USA;

    Advanced Materials and Liquid Crystal Institute Kent Ohio 44242 USA Materials Science Graduate Program Kent State University Kent Ohio 44242 USA Department of Physics Kent State University Kent Ohio 44242 USA;

    Advanced Materials and Liquid Crystal Institute Kent Ohio 44242 USA Materials Science Graduate Program Kent State University Kent Ohio 44242 USA Department of Physics Kent State University Kent Ohio 44242 USA;

    Advanced Materials and Liquid Crystal Institute Kent Ohio 44242 USA Materials Science Graduate Program Kent State University Kent Ohio 44242 USA Department of Physics Kent State University Kent Ohio 44242 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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