Photodriven,Flexural–Torsional Oscillation of Glassy Azobenzene Liquid Crystal Polymer Networks |
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| Authors: | Kyung Min Lee Matthew L. Smith Hilmar Koerner Nelson Tabiryan Richard A. Vaia Timothy J. Bunning Timothy J. White |
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| Affiliation: | 1. Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright Patterson Air Force Base, OH 45433, USA;2. Azimuth Corporation, Dayton, OH 45433, USA;3. National Research Council, Dayton, OH 45433, USA;4. UES Inc., Dayton, OH 45433, USA;5. BEAM Engineering for Advanced Measurements Co., Winter Park, FL 32789, USA |
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| Abstract: | Cantilevers composed of glassy, photoresponsive liquid crystalline polymer networks (LCNs) are shown to oscillate at high frequency (～50 Hz) and large amplitude when exposed to light from a 442 nm coherent wave (CW) laser. Added dimensionality to previously reported in‐plane oscillations is enabled by adjusting the orientation of the nematic director to the long axis of the cantilever yielding in‐plane bending accompanied by out‐of‐plane twisting (flexural–torsional oscillation). The fundamental photoresponse of this class of glassy azobenzene liquid crystal polymer networks (azo‐LCN) is further probed by examining the influence of cantilever aspect ratio, laser intensity, and temperature. The frequency of photodirected oscillations is strongly correlated to the length of the cantilever while the amplitude and threshold laser intensity for oscillation is strongly correlated to temperature. |
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| Keywords: | stimuli‐responsive materials liquid crystals actuators photochemistry |
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