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Plataforma sencilla y versátil para hidrogeles de conversión de fotones tolerantes al aire mediante co-ensamblaje de
Pankaj Bharmoria1, Shota Hisamitsu1, Hisanori Nagatomi1
1Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS) , Kyushu University , 744 Moto-oka , Nishi-ku , Fukuoka 819-0395 , Japan.
Journal of the American Chemical Society
|July 28, 2018
Resumen
Desarrollamos una nueva estrategia de hidrogel para la conversión ascendente de fotones estables al aire (TTA-UC) en agua. Este método supera la insolubilidad de cromóforos y el apagado de oxígeno, logrando una alta eficiencia para aplicaciones biológicas.
Área de la Ciencia:
- Ciencias de los materiales
- La fotoquímica
- Biotecnología
Sus antecedentes:
- La conversión ascendente de fotones basada en la aniquilación tripleta-tripleta (TTA-UC) es un desafío en medios acuosos debido a la insolubilidad de los cromóforos y la extinción del estado tripleta inducida por oxígeno.
- Los métodos existentes a menudo requieren ambientes desoxigenados, lo que limita las aplicaciones prácticas, especialmente en los sistemas biológicos.
Objetivo del estudio:
- Desarrollar una nueva estrategia para lograr un TTA-UC estable en el aire en entornos acuosos.
- Para superar las limitaciones de la insolubilidad de los cromóforos y la desactivación del oxígeno en los sistemas TTA-UC.
- Crear una plataforma basada en hidrogel para el TTA-UC con potencial para aplicaciones biológicas.
Principales métodos:
- Coensamblaje de biopolímeros (gelatina), tensioactivos (Tritón X-100) y conversión de cromóforos en una matriz de hidrogel.
- Caracterización de la estructura del hidrogel y su efecto sobre la acomodación del cromóforo y la dinámica del estado excitado.
- Medición de la eficiencia TTA-UC en condiciones de saturación de aire.
Principales resultados:
- Se obtiene TTA-UC estable en el aire con una alta eficiencia de conversión al alza del 13,5% en un hidrogel de gelatina-cromóforo Tritón X-100.
- Se demostró que la estructura jerárquica del hidrogel acomoda altas concentraciones de cromóforos y protege a los trillizos del oxígeno.
- Se observó una larga vida útil del triple aceptor (4,9 ms), lo que indica propiedades de barrera de oxígeno efectivas del hidrogel.
- Demostró la versatilidad de la estrategia con otros biopolímeros y tensioactivos.
Conclusiones:
- La estrategia de coensamblaje biopolímero-surfactante-cromóforo permite efectivamente el TTA-UC estable en el aire en hidrogeles acuosos.
- Este enfoque mejora significativamente la aplicabilidad de TTA-UC en sistemas biológicos y otros sistemas acuosos.
- El sistema de hidrogel desarrollado ofrece una plataforma prometedora para aplicaciones avanzadas de conversión de fotones.
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