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Cambios de forma rápidos y reversibles de cristales moleculares en la fotoirradicación
Seiya Kobatake1, Shizuka Takami, Hiroaki Muto
1Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, Sugimoto 3-3-138, Sumiyoshi-ku, Osaka 558-8585, Japan.
Nature
|April 13, 2007
Resumen
Los cristales moleculares con cromóforos de diarileteno exhiben cambios de forma rápidos y reversibles cuando se exponen a los rayos UV y a la luz visible. Estos materiales sensibles a la luz ofrecen una mejora significativa de la velocidad con respecto a las tecnologías existentes para potenciales actuadores accionados por luz.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- La fotoquímica es la fotoquímica.
- Nanotecnología La nanotecnología es la nanotecnología.
Sus antecedentes:
- Los actuadores basados en materiales sensibles a los estímulos son de gran interés.
- Los materiales sensibles a la luz ofrecen capacidades de operación remota.
- Los sistemas existentes basados en azobenzeno tienen tiempos de respuesta lentos.
Objetivo del estudio:
- Para investigar cambios de forma macroscópicos rápidos y reversibles en cristales moleculares.
- Explorar el potencial de los cristales basados en cromóforos de diarileteno como actuadores impulsados por luz.
Principales métodos:
- Se utilizan cristales moleculares (10-100 micrómetros) que incorporan cromóforos de diarileteno.
- Los cristales expuestos a la luz ultravioleta (UV) y la luz visible para inducir y revertir cambios de forma.
- Tiempos de respuesta medidos y deformaciones macroscópicas observadas.
Principales resultados:
- Los cristales exhibieron una rápida (aprox. 25 microsegundos) y cambios reversibles de forma y tamaño macroscópicos.
- Las estructuras cristalinas específicas se transforman de cuadrado a lózenge o se contraen en un 5-7%.
- Los cristales deformados demostraron estabilidad térmica y se volvieron a encender con la irradiación de luz visible.
Conclusiones:
- Los cristales moleculares basados en diarilethene son significativamente más rápidos que los sistemas de azobenzene.
- Estos materiales pueden inducir cambios macroscópicos y mover objetos microscópicos.
- Los cristales parecen prometedores para aplicaciones avanzadas de actuadores impulsados por luz.
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