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Dinámica de un líquido iónico a temperatura ambiente en membranas de líquido iónico apoyadas frente al líquido a
Jae Yoon Shin1, Steven A Yamada1, Michael D Fayer1
1Department of Chemistry, Stanford University , Stanford, California 94305, United States.
Journal of the American Chemical Society
|December 16, 2016
Resumen
Las membranas líquidas iónicas soportadas (SILM) muestran una dinámica más lenta que los líquidos a granel, lo que afecta su uso en la captura de carbono. Estos hallazgos sugieren que los estudios de líquidos a granel pueden no predecir el rendimiento de SILM.
Área de la Ciencia:
- Ciencias de los materiales
- Química Física
- Ingeniería Química
Sus antecedentes:
- Las membranas líquidas iónicas soportadas (SILM) son materiales avanzados para la captura de carbono.
- Comprender la dinámica de los líquidos iónicos dentro de los SILM es crucial para optimizar su rendimiento.
Objetivo del estudio:
- Investigar la dinámica de la reorientación y la difusión espectral del anión SeCN- y del 1-etil-3-metillimidazolio bis (trifluorometilesulfonil) imida (EmimNTf2) en las membranas de poli (éter sulfón) (PES).
- Para comparar la dinámica en SILM con las de EmimNTf2 a granel.
Principales métodos:
- Se utilizó la espectroscopia bidimensional infrarroja (2D IR) y la sonda de bomba de IR selectiva por polarización (PSPP).
- Se ha investigado la dinámica del anión SeCN en membranas de poliéter sulfónico (PES) (PES200 y PES30) con diferentes tamaños de poros.
- Dinámica comparada en SILM con el líquido iónico a temperatura ambiente (RTIL) EmimNTf2.
Principales resultados:
- La reorientación de las fluctuaciones estructurales de SeCN y RTIL fue significativamente más lenta en los SILM en comparación con los líquidos a granel.
- El tiempo de aleatorización orientativa completa aumentó de 136 ps (en masa) a 513 ps (PES30).
- La constante de decaimiento de difusión espectral estructural más lenta (SSD) aumentó de 140 ps (en masa) a 504 ps (PES200) y 1660 ps (PES30).
Conclusiones:
- Los efectos interfaciales en los SILM alteran sustancialmente la dinámica estructural de las RTIL, extendiéndose más allá de la interfaz inmediata.
- Las propiedades de RTIL a granel no son predictores confiables de su comportamiento dentro de los SILM para aplicaciones de captura de carbono.
- Se necesita más investigación para comprender y aprovechar estas dinámicas alteradas para mejorar el diseño de SILM.
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