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La electroquímica en polímeros tribocargados se rige por la estabilidad de las cargas superficiales en lugar de la

Jinyang Zhang¹, Fergus J M Rogers², Nadim Darwish¹

¹School of Molecular and Life Sciences, Curtin Institute of Functional Molecules and Interfaces , Curtin University , Bentley , Western Australia 6102 , Australia.

Journal of the American Chemical Society

|March 20, 2019

Resumen

La triboelectricidad implica la transferencia de carga entre las superficies. Este estudio cuantifica el flujo de carga, vinculando plástico

Área de la Ciencia:

La electroquímica
Ciencias de los materiales
Ciencias de la superficie

Sus antecedentes:

La triboelectricidad es la carga eléctrica que un objeto gana cuando se introduce y se separa de otro objeto.
La naturaleza precisa de los portadores de carga en la triboelectricidad sigue siendo difícil de establecer.
Comprender los mecanismos de transferencia de carga es crucial para el desarrollo de nanogeneradores y sensores triboeléctricos avanzados.

Objetivo del estudio:

Investigar cuantitativamente la naturaleza de los portadores de carga involucrados en la triboelectricidad.
Establecer una relación entre las propiedades del material y la transferencia de carga durante el contacto y la separación.
Para proporcionar evidencia directa de la naturaleza de mosaico de las cargas triboeléctricas.

Principales métodos:

Experimentos de electrificación por contacto con muestras de plástico y partículas metálicas.
Medición de la carga eléctrica neta mediante un cubo/electrómetro de Faraday.
Análisis de la relación entre la carga de la muestra, la descarga de iones metálicos y las propiedades del material (afinidad de electrones, energía de ionización).

Principales resultados:

Se observó una relación casi lineal entre la carga negativa neta de una muestra de plástico y la cantidad de iones metálicos descargados en la solución.
El coeficiente de proporcionalidad está vinculado a la afinidad electrónica de la muestra, lo que indica la estabilidad de los fragmentos aniónicos.
La extensión de la muestra que actúa como fuente de electrones excede significativamente la carga neta medida, lo que apoya una distribución de carga de mosaico.

Conclusiones:

La triboelectricidad surge de un mosaico de cargas positivas y negativas, no de una distribución homogénea.
El trabajo redox reductivo dependiente del material dicta la extensión del crecimiento de partículas metálicas sobre dieléctricos cargados.
Este estudio define por primera vez el alcance cuantitativo de los portadores de carga en la triboelectricidad.

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