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Photo-actuators via epitaxial growth of microcrystal arrays in polymer membranes

Journal Article · · Nature Materials
 [1];  [2];  [2];  [3];  [4];  [5];  [4];  [2];  [1]
  1. University of Colorado, Boulder, CO (United States)
  2. Stanford University, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
  3. University of Colorado, Boulder, CO (United States); University of Massachusetts, Amherst, MA (United States)
  4. University of California, Riverside, CA (United States)
  5. University of Massachusetts, Amherst, MA (United States)

Photomechanical crystals composed of three-dimensionally ordered and densely packed photochromes hold promise for high-performance photochemical actuators. However, bulk crystals with high structural ordering are severely limited in their flexibility, resulting in poor processibility and a tendency to fragment upon light exposure, while previous nano- or microcrystalline composites have lacked global alignment. Here we demonstrate a photon-fuelled macroscopic actuator consisting of diarylethene microcrystals in a polyethylene terephthalate host matrix. These microcrystals survive large deformations and show a high degree of three-dimensional ordering dictated by the anisotropic polyethylene terephthalate, which critically also has a similar stiffness. Overall, these ordered and compliant composites exhibit rapid response times, sustain a performance of over at least hundreds of cycles and generate work densities exceeding those of single crystals. In conclusion, our composites represent the state-of-the-art for photochemical actuators and enable properties unattainable by single crystals, such as controllable, reversible and abrupt jumping (photosalient behaviour).

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); US Department of the Navy, Office of Naval Research (ONR); US Air Force Office of Scientific Research (AFOSR)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1994461
Report Number(s):
LLNL--JRNL-837770; 1057233
Journal Information:
Nature Materials, Journal Name: Nature Materials Journal Issue: 9 Vol. 22; ISSN 1476-1122
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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