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Formación de Patrones Durante la Hinchazón en Soluciones Acuosas de Glicerina de Perlas de Hidrogel
Sebastian A Falcioni1, Yanina L Roht1, Germán Drazer2
1Universidad de Buenos Aires, Facultad de Ingeniería, Grupo de Medios Porosos, Paseo Colón 850, Buenos Aires 1063, Argentina.
The journal of physical chemistry. B
|February 16, 2026
Resumen
Las inestabilidades superficiales en las perlas de hidrogel pasan de arrugas a patrones laberínticos a medida que se hinchan. El aumento de la viscosidad de la solución retrasa esta formación de patrones pero no cambia su geometría fundamental.
Área de la Ciencia:
- Ciencia de Materiales
- Física de Materia Blanda
- Ingeniería Química
Sus antecedentes:
- La hinchazón de hidrogeles en soluciones puede inducir la formación de patrones superficiales complejos.
- La comprensión de estas inestabilidades es crucial para aplicaciones que involucran dispositivos basados en hidrogeles.
Objetivo del estudio:
- Investigar las inestabilidades superficiales durante la hinchazón de hidrogeles en diversas concentraciones de glicerina.
- Caracterizar la transición en la morfología superficial y sus relaciones de escala.
Principales métodos:
- Se utilizó una técnica de imagen láser para monitorear la hinchazón de hidrogeles y la evolución de los patrones superficiales.
- Se variaron experimentalmente las concentraciones de glicerina en soluciones acuosas para alterar la dinámica de hinchazón.
Principales resultados:
- Se observó una transición de patrones superficiales arrugados a laberínticos con la disminución del número de lóbulos y el aumento de la longitud de onda.
- Se demostró que la longitud de onda del patrón se escala con el grosor de la capa hidratada, independientemente de la concentración de glicerina.
- Se mostró que el tiempo reescalado colapsa la evolución del patrón en una curva universal, lo que indica que la viscosidad afecta principalmente el tiempo, no la geometría.
Conclusiones:
- La concentración de glicerina influye principalmente en la escala temporal de la evolución del patrón superficial del hidrogel, no en la morfología final.
- Las leyes de escala observadas proporcionan un marco predictivo para las inestabilidades superficiales de los hidrogeles.
- Los efectos poroelásticos rigen el desarrollo de patrones superficiales durante la hinchazón de hidrogeles.
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