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Asimetría óptica mejorada en conjuntos quiroplasmónicos supramoleculares con orden de largo alcance
Jun Lu1,2,3, Yao Xue1, Kalil Bernardino4
1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, China.
Resumen
Los investigadores desarrollaron conjuntos quirales de nanorods de oro y polipéptidos amiloides, logrando una asimetría óptica más de 4600 veces mayor. Este avance permite la detección avanzada de fármacos en entornos biológicos.
Área de la Ciencia:
- Nanotecnología
- La biofísica
- Ciencias de los materiales
Sus antecedentes:
- Los ensamblajes quirales de nanopartículas plasmónicas exhiben un fuerte dicroísmo circular pero una asimetría óptica limitada.
- La dispersión y las combinaciones desfavorables de componentes de campo impiden la asimetría óptica en los ensamblajes de nanopartículas actuales.
Objetivo del estudio:
- Para superar las limitaciones en la asimetría óptica para conjuntos de nanopartículas quirales plasmónicas.
- Explorar la organización de largo alcance de las nanopartículas para mejorar las propiedades ópticas.
Principales métodos:
- Se crearon ensamblajes helicoidales de nanorodos de oro con polipéptidos amiloides de islotes humanos.
- Los principios de organización similares a los cristales líquidos se aplicaron al ensamblaje de nanopartículas.
- Se analizaron las propiedades ópticas, incluidos los desplazamientos espectrales y la dispersión.
Principales resultados:
- Los factores g de la asimetría óptica aumentaron más de 4.600 veces.
- Se observaron fuertes cambios espectrales dependientes de la polarización.
- La reducción de la dispersión en las hélices ensambladas contribuyó a una mayor asimetría.
Conclusiones:
- La organización de nanopartículas de largo alcance, imitando a los cristales líquidos, aumenta significativamente la asimetría óptica.
- Los conjuntos helicoidales desarrollados permiten la detección de fármacos en medios biológicos complejos.
- Los resultados proporcionan orientación estructural para el diseño de materiales con alta asimetría óptica.
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