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New insights into photoactivated volume generation boost surface morphing in liquid crystal coatings

Author

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  • Danqing Liu

    (Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology
    Laboratory of Functional Organic Materials and Devices (SFD), Eindhoven University of Technology)

  • Dirk J. Broer

    (Institute for Complex Molecular Systems (ICMS), Eindhoven University of Technology
    Laboratory of Functional Organic Materials and Devices (SFD), Eindhoven University of Technology)

Abstract

Photoactivated generation of disorder in a liquid crystal network produces free volume that leads to the controlled formation of dynamic corrugations at its surface. The liquid crystal order amplifies the deformation of copolymerized azobenzene, which takes place on molecular length scales, to a micrometre-sized macroscopic phenomenon based on changes in density. We postulate a new mechanism in which continuous oscillating dynamics of the trans-to-cis isomerization of the azobenzene overrules the net conversion, which is currently considered as the origin. This is supported by a significant local density decrease when both the trans and cis isomers are triggered simultaneously, either by dual-wavelength excitation or by the addition of a fluorescent agent converting part of the light to the cis-actuating wavelengths. This new insight provides a general guideline to boost free volume generation leading not only to larger macroscopic deformations but also to controllable and faster non-equilibrium dynamics.

Suggested Citation

  • Danqing Liu & Dirk J. Broer, 2015. "New insights into photoactivated volume generation boost surface morphing in liquid crystal coatings," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9334
    DOI: 10.1038/ncomms9334
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