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High Resolution Physical Characterization of Single Metallic Nanoparticles
Published on: June 28, 2019
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Caracterización de la deshidratación durante el transporte de iones en nanocanales poliméricos
Chenghai Lu1,2, Chengzhi Hu1,2, Cody L Ritt3
1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, People's Republic of China.
Journal of the American Chemical Society
|August 25, 2021
Resumen
Los iones hidratados pueden cruzar los nanocanales derramando parcialmente las moléculas de agua, sin requerir una deshidratación completa. Este descubrimiento avanza en la comprensión del transporte de iones en poros subnanométricos para diversas aplicaciones.
Área de la Ciencia:
- Los nanofluidos
- Química Física
- Ciencias de los materiales
Sus antecedentes:
- El transporte de iones a través de nanocanales es crucial para las aplicaciones biológicas y tecnológicas.
- La comprensión de la estructura de hidratación iónica durante el transporte está limitada por las técnicas de caracterización actuales.
Objetivo del estudio:
- Para caracterizar experimentalmente la deshidratación de iones durante el transporte transmembrana.
- Para dilucidar el mecanismo de permeación de iones hidratados a través de poros subnanométricos.
Principales métodos:
- Se utilizó una espectrometría de masa de iones secundarios de tiempo de vuelo (ToF-SIMS) modificada in situ.
- Simulaciones de dinámica molecular integrada para su interpretación mecanicista.
- Se ha investigado el transporte de iones de metales alcalinos (Li+, Na+, K+).
Principales resultados:
- La deshidratación completa de iones no es esencial para el transporte a través de poros subnanométricos.
- El derramamiento parcial de moléculas de agua permite que los iones penetren poros más pequeños que su tamaño hidratado.
- Los iones suelen retener un máximo de dos moléculas de agua durante el transporte estérico limitado.
Conclusiones:
- La nueva técnica in situ proporciona una visión sin precedentes de la solvación iónica durante el transporte.
- Los hallazgos tienen implicaciones para el avance de la separación iónica, el biosensing y las tecnologías de la batería.
- La movilidad iónica y los efectos viscosos influyen en la hidratación iónica y las tasas de transporte en los nanoporos.
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