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Controlar la dinámica de las películas delgadas de líquidos iónicos a través de la funcionalización de superficies

Boning Wu¹, John P Breen¹, Xiangyu Xing¹

¹Department of Chemistry, Stanford University, Stanford, California 94305, United States.

Journal of the American Chemical Society

|May 1, 2020

Resumen

La dinámica de la película líquida iónica se ralentiza con la disminución del grosor y el aumento de la carga superficial. La densidad de carga superficial ofrece control sobre las propiedades de la película líquida iónica para aplicaciones como las baterías.

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Área de la Ciencia:

Química Física
Ciencias de los materiales
Ciencias de la superficie

Sus antecedentes:

Los líquidos iónicos (IL) son electrolitos prometedores en dispositivos electroquímicos.
Comprender el comportamiento de IL en las interfaces es crucial para el rendimiento del dispositivo.
Las películas delgadas de IL exhiben propiedades únicas en comparación con las IL a granel.

Objetivo del estudio:

Investigar la dinámica estructural de las películas líquidas iónicas.
Determinar la influencia de la densidad de carga superficial y el grosor de la película en la dinámica de la IL.
Explorar métodos para el control de la dinámica de la película IL.

Principales métodos:

Se utilizó la espectroscopia infrarroja bidimensional (2D IR).
Películas delgadas preparadas de 1-butilo-3-metillimidazolio bis (BmimNTf2) mediante un recubrimiento de espín.
Sustratos de sílice funcionalizados con densidades de carga variables.

Principales resultados:

La dinámica de la película IL es más lenta que la IL a granel, y la dinámica se ralentiza a medida que disminuye el grosor de la película.
El aumento de la densidad de carga superficial conduce a una dinámica IL más lenta.
Las películas en superficies neutras exhiben una dinámica más rápida que en las superficies iónicas, pero más lenta que la IL a granel.

Conclusiones:

La densidad de carga superficial es un parámetro clave para controlar la dinámica de la película delgada de IL.
Estos hallazgos tienen implicaciones para el diseño de interfaces en dispositivos electroquímicos como las baterías.
La adaptación de las propiedades de la superficie puede optimizar el rendimiento de IL en aplicaciones.