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Making waves in a photoactive polymer film

机译：在光敏聚合物薄膜中产生波

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Oscillating materials(1-4) that adapt their shapes in response to external stimuli are of interest for emerging applications in medicine and robotics. For example, liquid-crystal networks can be programmed to undergo stimulus-induced deformations in various geometries, including in response to light(5,6). Azobenzene molecules are often incorporated into liquid-crystal polymer films to make them photoresponsive(7-11); however, in most cases only the bending responses of these films have been studied, and relaxation after photo-isomerization is rather slow. Modifying the core or adding substituents to the azobenzene moiety can lead to marked changes in photophysical and photochemical properties(12-15), providing an opportunity to circumvent the use of a complex set-up that involves multiple light sources, lenses or mirrors. Here, by incorporating azobenzene derivatives with fast cis-to-trans thermal relaxation into liquid-crystal networks, we generate photoactive polymer films that exhibit continuous, directional, macroscopic mechanical waves under constant light illumination, with a feedback loop that is driven by self-shadowing. We explain the mechanism of wave generation using a theoretical model and numerical simulations, which show good qualitative agreement with our experiments. We also demonstrate the potential application of our photoactive films in light-driven locomotion and self-cleaning surfaces, and anticipate further applications in fields such as photomechanical energy harvesting and miniaturized transport.
机译：响应于外部刺激而适应其形状的振荡材料（1-4）对于医学和机器人技术中的新兴应用很感兴趣。例如，可以对液晶网络进行编程，使其在各种几何形状中经历刺激引起的变形，包括响应光（5,6）。常常将偶氮苯分子掺入液晶聚合物薄膜中以使其具有光响应性（7-11）；然而，在大多数情况下，仅研究了这些膜的弯曲响应，并且光异构化后的弛豫相当慢。修饰核心或向偶氮苯部分添加取代基可导致光物理和光化学性质发生明显变化（12-15），从而为避免使用涉及多个光源，透镜或反射镜的复杂装置提供了机会。在这里，通过将具有快速顺式至反式热弛豫的偶氮苯衍生物并入液晶网络，我们生成了光敏聚合物膜，该膜在恒定光照下显示出连续的，定向的，宏观的机械波，并具有由自驱动驱动的反馈回路。阴影。我们使用理论模型和数值模拟解释了波浪产生的机理，这些结果与我们的实验具有很好的定性一致性。我们还演示了光敏膜在光驱动的运动和自清洁表面中的潜在应用，并展望了光机械能量收集和小型化运输等领域的进一步应用。

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  • 来源
    《Nature》 |2017年第7660期|632-636|共5页
  • 作者

    Gelebart Anne Helene; Mulder Dirk Jan; Varga Michael; Konya Andrew; Vantomme Ghislaine; Meijer E. W.; Selinger Robin L. B.; Broer Dirk J.;

  • 作者单位

    Eindhoven Univ Technol, Lab Funct Organ Mat & Devices SFD, Dept Chem Engn & Chem, Eindhoven, Netherlands|Eindhoven Univ Technol, ICMS, Eindhoven, Netherlands;

    Eindhoven Univ Technol, Lab Funct Organ Mat & Devices SFD, Dept Chem Engn & Chem, Eindhoven, Netherlands;

    Kent State Univ, Inst Liquid Crystal, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA;

    Kent State Univ, Inst Liquid Crystal, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA;

    Eindhoven Univ Technol, ICMS, Eindhoven, Netherlands;

    Eindhoven Univ Technol, ICMS, Eindhoven, Netherlands;

    Kent State Univ, Inst Liquid Crystal, Chem Phys Interdisciplinary Program, Kent, OH 44242 USA;

    Eindhoven Univ Technol, Lab Funct Organ Mat & Devices SFD, Dept Chem Engn & Chem, Eindhoven, Netherlands|Eindhoven Univ Technol, ICMS, Eindhoven, Netherlands;

  • 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);美国《化学文摘》(CA);
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