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Reflexión circularmente polarizada reversible en una superestructura helicoidal autoorganizada habilitada por un
Hao Wang1, Hari Krishna Bisoyi1, Augustine M Urbas2
1Advanced Materials and Liquid Crystal Institute and Chemical Physics Interdisciplinary Program , Kent State University Kent , Ohio 44242 , United States.
Journal of the American Chemical Society
|May 4, 2019
Resumen
Los investigadores desarrollaron un nuevo interruptor molecular quiral impulsado por luz visible. Este interruptor permite cambios de color reversibles en pantallas de cristal líquido, allanando el camino para dispositivos fotónicos avanzados.
Área de la Ciencia:
- Ciencias de los materiales
- Química orgánica
- La fotoquímica
Sus antecedentes:
- El desarrollo de materiales funcionales impulsados por la luz con propiedades reversibles es un área de investigación clave.
- Los interruptores moleculares son cruciales para los dispositivos ópticos y electrónicos avanzados.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo interruptor molecular quiral impulsado por luz visible.
- Para investigar su comportamiento de fotoisomerización y poder de torsión helicoidal (HTP) en cristales líquidos.
- Para demostrar su aplicación en pantallas fotónicas sintonizables.
Principales métodos:
- Síntesis de un interruptor molecular quiral que incorpora un motivo de azobenzeno vinculado a un andamio axialmente quiral.
- Estudios de fotoisomerización con luz visible (450 nm y 530 nm).
- Medición de la potencia de torsión helicoidal (HTP) en anfitriones de cristales líquidos colestéricos.
- Fabricación y ensayo de pantallas fototuneables en color.
Principales resultados:
- La molécula sintetizada actúa como un interruptor molecular quiral, experimentando una fotoisomerización reversible de trans a cis y cis a trans con luz visible.
- El interruptor exhibe una alta potencia de torsión helicoidal (HTP) con un cambio significativo en la fotoisomerización.
- El ajuste dinámico de reflexión a través del espectro visible se logró en cristales líquidos colestéricos.
- Se demostraron fotodisplays con patrones que emiten luz polarizada circularmente en rojo, verde y azul.
Conclusiones:
- Este estudio presenta el primer interruptor molecular quiral que une directamente un azobenzeno impulsado por luz visible a un andamio quiral axial a través de un enlace C-C.
- El material es prometedor para aplicaciones en pantallas de color sintonizables y dispositivos fotónicos debido a su fotoisomerización reversible y alto HTP.
- El sistema desarrollado permite que la información se oculte y restaure de manera reversible en las pantallas utilizando campos eléctricos y fuerza mecánica.
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