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Comportamiento polilíquido de fluidos autoasociados y agregación mesoscópica en soluciones líquidas
Ilya Davydov1, Vassiliy Lubchenko1,2,3
1Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.
The Journal of chemical physics
|September 4, 2025
Resumen
Se forman grupos mesoscópicos en soluciones debido a la complejación del soluto. Este estudio modela los fluidos autoasociados, revelando las condiciones para la coexistencia de fases líquidas ricas en dimeros y monómeros, explicando la formación de racimos.
Área de la Ciencia:
- La termodinámica
- Química Física
- Física de la materia blanda
Sus antecedentes:
- Los grupos mesoscópicos de líquido rico en solutos observados en soluciones de proteínas desafían la termodinámica estándar.
- Un escenario de complejación propuesto sugiere que la formación de complejos de solutos transitorios impulsa la aparición de gotas.
Objetivo del estudio:
- Investigar la termodinámica de un modelo de fluido autoasociado con formación de dímeros transitorios.
- Determinar las condiciones para la coexistencia de fases líquidas distintas y la aparición de cúmulos mesoscópicos.
Principales métodos:
- Solución para la termodinámica de un modelo explícito de un fluido autoasociado.
- Analizando las interacciones de partículas incluyendo la formación de dímeros transitorios.
- Diagramas de fase de mapeo para identificar las fases líquidas coexistentes.
Principales resultados:
- Intervalos de parámetros identificados para la coexistencia de fases líquidas densas ricas en dimeros y monómeros con una fase pobre en solutos.
- Condiciones termodinámicas confirmadas para la emergencia de cúmulos mesoscópicos dentro de rangos específicos de fuerza de unión de dímeros.
- Agrupaciones previstas compuestas por un líquido metastable rico en monómeros, con una solución a granel que contiene dímeros y presenta fluctuaciones de densidad.
Conclusiones:
- Los hallazgos apoyan el escenario de complejidad para la formación de grupos mesoscópicos en soluciones.
- Se predijo que la separación líquido-líquido macroscópica produce una fase densa rica en dimeros.
- Sugiere nuevas vías experimentales para validar el modelo de complejidad y los fenómenos observados.
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