An artificial nocturnal flower via humidity-gated photoactuation in liquid crystal networks

Owies M. Wani, Rob Verpaalen, Hao Zeng, Arri Priimagi (Corresponding author), Albert P.H.J. Schenning (Corresponding author)

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26 Citations (Scopus)
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Abstract

Beyond their colorful appearances and versatile geometries, flowers can self-shape-morph by adapting to environmental changes. Such responses are often regulated by a delicate interplay between different stimuli such as temperature, light, and humidity, giving rise to the beauty and complexity of the plant kingdom. Nature inspires scientists to realize artificial systems that mimic their natural counterparts in function, flexibility, and adaptation. Yet, many of the artificial systems demonstrated to date fail to mimic the adaptive functions, due to the lack of multi-responsivity and sophisticated control over deformation directionality. Herein, a new class of liquid-crystal-network (LCN) photoactuators whose response is controlled by delicate interplay between light and humidity is presented. Using a novel deformation mechanism in LCNs, humidity-gated photoactuation, an artificial nocturnal flower is devised that is closed under daylight conditions when the humidity level is low and/or the light level is high, while it opens in the dark when the humidity level is high. The humidity-gated photoactuators can be fueled with lower light intensities than conventional photothermal LCN actuators. This, combined with facile control over the speed, geometry, and directionality of movements, renders the “nocturnal actuator” promising for smart and adaptive bioinspired microrobotics.

Original languageEnglish
Article number1805985
Number of pages6
JournalAdvanced Materials
Volume31
Issue number2
DOIs
Publication statusPublished - 11 Jan 2019

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Keywords

  • actuator
  • azobenzene
  • bioinspired
  • humidity
  • light
  • liquid crystal
  • multi-responsive

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