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Interacciones coloidales electrostáticas de largo alcance y efectos de iones específicos en disolventes eutéticos
Adrian Sanchez-Fernandez1, Andrew J Jackson2,3, Sylvain F Prévost4
1Food Technology, Engineering and Nutrition, Lund University, Box 124, 221 00 Lund, Sweden.
Journal of the American Chemical Society
|August 30, 2021
Resumen
En los disolventes eutécticos profundos, las correlaciones electrostáticas son fuertes incluso a altas concentraciones de iones, revelando repulsiones de largo alcance entre las micelas. Efectos específicos de iones, como los de la serie Hofmeister, influyen en el comportamiento de las micelas.
Área de la Ciencia:
- Química Física
- Ciencia de los coloides
- Ciencias de los materiales
Sus antecedentes:
- Las teorías tradicionales sugieren interacciones electrostáticas débiles a altas concentraciones de iones.
- Los disolventes eutecticos profundos (DES) poseen concentraciones de iones intrínsecamente altas (> 2,5 M).
- La comprensión de las interacciones intercelulares en DES es crucial para sus aplicaciones.
Objetivo del estudio:
- Investigar las interacciones intercelulares en los disolventes eutecticos profundos cloruro de colina: glicerol y bromuro de colina: glicerol.
- Determinar el papel de las correlaciones electrostáticas y los efectos iónicos específicos en estos sistemas.
- Desafiar el punto de vista tradicional sobre las interacciones electrostáticas en medios de alta resistencia iónica.
Principales métodos:
- Se empleó la dispersión de neutrones de ángulo pequeño (SANS) para estudiar las estructuras e interacciones de la micela.
- Se analizaron dos mezclas específicas de disolventes eutecticos profundos (1:2 cloruro de colina: glicerol y 1:2 bromuro de colina: glicerol).
- El análisis se centró en las distancias intercelulares y las fuerzas repulsivas.
Principales resultados:
- Se observó evidencia de repulsiones electrostáticas de largo alcance entre partículas coloidales cargadas (micelas) en el DES estudiado.
- La morfología de las micelas y las interacciones electrostáticas fueron moduladas significativamente por la condensación de contraiones.
- Estas modulaciones se alinearon con las tendencias predichas por la serie Hofmeister, lo que indica efectos iónicos específicos.
Conclusiones:
- Las correlaciones electrostáticas juegan un papel dominante en las interacciones intercelulares dentro del DES, contrariamente a las suposiciones tradicionales.
- Los efectos específicos de iones, impulsados por la condensación de contraiones, son significativos incluso en altas concentraciones de iones a granel.
- Las correlaciones ión-ión reducen la fuerza iónica efectiva, explicando los fenómenos observados en DES.
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