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Los sistemas multifásicos acuosos de polímeros y tensioactivos proporcionan gradientes escalonados de autoensamblaje
Charles R Mace1, Ozge Akbulut, Ashok A Kumar
1Department of Chemistry & Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.
Journal of the American Chemical Society
|May 19, 2012
Resumen
Los investigadores crearon más de 300 sistemas multifase acuosos estables (MuPS) utilizando polímeros y agentes tensioactivos. Estos sistemas permiten separaciones precisas basadas en la densidad de los materiales mezclados.
Área de la Ciencia:
- Química Física es la química física.
- Ciencia de los materiales Ciencia de los materiales.
- Ciencia de la separación Ciencia de la separación.
Sus antecedentes:
- Los sistemas multifásicos acuosos (MuPS) se forman a partir de mezclas de polímeros y tensioactivos en el agua.
- Estos sistemas exhiben autoensamblaje y estabilidad termodinámica.
- El control de los gradientes de densidad es crucial para las aplicaciones de separación.
Objetivo del estudio:
- Demostrar la generación de un gran número de diversos sistemas acuosos multifásicos (MuPS).
- Para investigar las propiedades de los gradientes de densidad dentro de estos MuPSs.
- Mostrar la utilidad de MuPSs para la separación de objetos basada en la densidad.
Principales métodos:
- Generación de más de 300 MuPSs a partir de soluciones acuosas de polímeros y agentes tensioactivos.
- Caracterización de los gradientes escalonados de densidad (Δρ ≈ 0.001 g/cm3) entre las fases.
- Demostración de la separación utilizando cuentas de vidrio y bolitas de nylon de diferentes densidades.
Principales resultados:
- Generó con éxito más de 300 MuPS con 2-6 fases.
- Se lograron gradientes de densidad de paso termodinámicamente estables e invariables en el tiempo sintonizables por co-soluciones.
- Se demuestra la separación efectiva de objetos basada en diferencias de densidad.
Conclusiones:
- Los sistemas multifásicos acuosos (MuPS) ofrecen gradientes de densidad estables y agudos.
- Estos MuPS pueden ser utilizados para nuevas técnicas de fraccionamiento y separación.
- La capacidad de ajustar los pasos de densidad abre nuevas vías para la separación de materiales.
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