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Síntesis confinada de películas delgadas de marco orgánico covalente bidimensional dentro de la capa de agua
Qing Hao1,2, Chuangqi Zhao3, Bing Sun4
1Key Laboratory of Molecular Nanostructure and Nanotechnology, Institute of Chemistry , Chinese Academy of Sciences and Beijing National Laboratory for Molecular Sciences , Beijing 100190 , P. R. China.
Journal of the American Chemical Society
|September 5, 2018
Resumen
Este estudio introduce un nuevo método para sintetizar películas delgadas de marco orgánico covalente bidimensional (2D COF) independientes utilizando una emulsión de agua en aceite. Estas películas de COF presentan excelentes propiedades mecánicas y son adecuadas para aplicaciones en nanofiltración y detección.
Área de la Ciencia:
- Ciencias de los materiales
- Nanotecnología
- Ingeniería Química
Sus antecedentes:
- Las estructuras orgánicas covalentes bidimensionales (2D COF) son materiales avanzados con propiedades sintonizables.
- Los métodos de síntesis existentes para los COF 2D suelen dar lugar a polvos o requieren procedimientos complejos.
- El desarrollo de películas delgadas de COF 2D independientes es crucial para aplicaciones avanzadas.
Objetivo del estudio:
- Desarrollar un método nuevo y eficiente para la síntesis confinada de películas delgadas de COF 2D independientes.
- Caracterizar las propiedades estructurales, morfológicas y mecánicas de las películas de COF sintetizadas.
- Demostrar el potencial de aplicación de estas películas de COF independientes en nanofiltración y detección.
Principales métodos:
- Se utilizó un enfoque de síntesis confinada que empleaba agua superdifundida delgada en un hidrogel sumergido en aceite como medio de reacción.
- Monómeros cargados en las fases de aceite e hidrogel para facilitar la síntesis de COF en la interfaz aceite/agua/hidrogel.
- Microscopía de fuerza atómica (AFM) empleada para la caracterización de propiedades mecánicas.
Principales resultados:
- Se han sintetizado con éxito películas delgadas de COF 2D independientes con topografía homogénea, gran área y grosor controlable (4-150 nm).
- Las películas caracterizadas exhibieron cristalinidad con orientación específica y un módulo de Young de 25,9 ± 0,6 GPa, lo que indica una buena resistencia mecánica.
- Demostró la utilidad de estas películas en la fabricación de membranas de nanofiltro y sensores fotoelectroquímicos para Ru3+.
- Amplió la estrategia de síntesis para producir películas delgadas de marco de imidazolato zeolítico cristalino-8 (ZIF-8).
Conclusiones:
- La estrategia de interfaz aceite/agua/hidrogel desarrollada ofrece una nueva vía para sintetizar películas delgadas de COF 2D de alta calidad y independientes.
- Las películas de COF sintetizadas poseen propiedades deseables para aplicaciones avanzadas de membranas y sensores.
- La versatilidad del método fue confirmada por su aplicación exitosa a la síntesis de ZIF-8, destacando su amplia aplicabilidad.
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