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Effects of Template and Molecular Nanostructure on the Performance of Organic-Inorganic Photomechanical Actuator Membranes

机译：模板和分子纳米结构对有机-无机光机械促动器膜性能的影响

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摘要

Porous anodic aluminum oxide (AAO) membranes template the growth of photochromic crystalline nanowires. The resulting organic-inorganic composite can function as a photomechanical bending actuator. In order to investigate how the nanostructural properties of both the organic and inorganic components affect the photomechanical response, the composite mechanical properties are characterized using a variety of methods. There is a significant variation in both morphology and elastic modulus for two commercially available AAO templates with nominally identical pore diameters of 200 nm. After these templates are filled with diarylethene molecules that undergo a ring-open to ring-closed photoisomerization, the light-generated curvature and mechanical work are evaluated using two different methods. The templates with a lower average elastic modulus (16 GPa vs 68 GPa) generate almost an order of magnitude more photomechanical work. The dependence of the photomechanical response on the chemical structure of the photochrome is assessed by comparing the performance of a diarylethene that undergoes a crystal expansion to that of one that undergoes a contraction, which leads to a decrease in curvature. Both the inorganic template and the organic active component play important roles in the overall photomechanical response, with substantial room to improve the performance.
机译：多孔阳极氧化铝（AAO）膜使光致变色晶体纳米线的生长成为模板。所得的有机-无机复合材料可以用作光机械弯曲致动器。为了研究有机和无机组分的纳米结构性能如何影响光机械响应，使用多种方法对复合材料的机械性能进行了表征。对于两种名义上具有相同孔径为200 nm的市售AAO模板，其形态和弹性模量均存在显着变化。在这些模板中充满进行开环至闭环光异构化的二芳基乙烯分子后，使用两种不同的方法评估光产生的曲率和机械功。具有较低平均弹性模量（16 GPa对68 GPa）的模板产生的光机械功几乎提高了一个数量级。通过比较经历晶体膨胀的二芳基乙烯的性能与经历晶体膨胀的二芳基乙烯的性能（其导致曲率减小）来评估光机械响应对光致变色剂化学结构的依赖性。无机模板和有机活性成分在整个光机械响应中都起着重要作用，还有很大的提升空间。

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