Mastering the photothermal effect in liquid crystal networks
| Autor: | Anne Helene Gelebart, E. W. Meijer, Dirk J. Broer, Ghislaine Vantomme |
|---|---|
| Přispěvatelé: | Stimuli-responsive Funct. Materials & Dev., Macro-Organic Chemistry, Macromolecular and Organic Chemistry, Institute for Complex Molecular Systems |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Oscillations Photothermal Hinge 02 engineering and technology 010402 general chemistry 01 natural sciences Optics Liquid crystal Molecule General Materials Science Self-sustained Molecular switch business.industry Oscillation Mechanical Engineering Liquid crystals Photothermal effect Light irradiation Photothermal therapy 021001 nanoscience & nanotechnology 0104 chemical sciences Adaptive materials Mechanics of Materials Optoelectronics 0210 nano-technology business |
| Zdroj: | Advanced Materials Advanced Materials, 29(18):1606712. Wiley-VCH Verlag |
| ISSN: | 0935-9648 |
| DOI: | 10.1002/adma.201606712 |
| Popis: | Chemical networks and molecular switches dominate the area of research geared toward macroscopic motion of materials. A counter-intuitive approach to create self-sustained oscillation by light irradiation of ordinary photostabilizers in splay-aligned liquid-crystalline networks made from commercial mesogens is developed. Photostabilizers or any molecules that are able to quickly dissipate the absorbed light through heat, by vibrational and/or rotational modes, can reach self-oscillating macroscopic motion where self-shadowing plays a critical role. The mechanical self-oscillation is linked to temperature oscillations and the asymmetric response over the film thickness. Only a localized responsive zone, acting as hinge, activates the oscillation of a beam-shaped device. The outcome of this research is extended from UV to near-IR actuation, making bulk applications to convert sunlight into mechanical work within reach. |
| Databáze: | OpenAIRE |
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