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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
Published on: August 2, 2012
Autoorganización de los coloides bidispersos en las gotas de agua
Young-Sang Cho1, Gi-Ra Yi, Jong-Min Lim
1Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701 Korea.
Journal of the American Chemical Society
|November 10, 2005
Resumen
Los investigadores crearon nuevos grupos coloidales binarios utilizando emulsiones de agua en aceite, lo que permite diversas estructuras de materiales. La disposición de las partículas más pequeñas dependía de las interacciones, ofreciendo nuevos bloques de construcción para materiales avanzados.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Colloide y la química de las superficies.
- El autoensamblaje.
Sus antecedentes:
- Los clústeres coloidales tradicionales a menudo se derivan de emulsiones de aceite en agua con microsferas uniformes.
- Controlar la autoorganización de grupos coloidales finitos en espacios confinados es clave para estructurar la materia a través de escalas.
Objetivo del estudio:
- Desarrollar nuevos grupos coloidales binarios utilizando emulsiones de agua en aceite con fase invertida.
- Para investigar la auto-organización de los sistemas coloidales binarios con diferentes proporciones de tamaño y composiciones.
- Explorar las aplicaciones potenciales de estas nuevas estructuras coloidales.
Principales métodos:
- Fabricación de grupos coloidales binarios utilizando emulsiones de agua en aceite con combinaciones de microesferas de sílice/estireno y nanopartículas de sílice/titanio.
- Observación experimental de la formación de cúmulos y la evolución estructural.
- Simulaciones numéricas utilizando Surface Evolver para validar los hallazgos experimentales.
Principales resultados:
- Se han producido con éxito nuevos grupos coloidales binarios a partir de emulsiones de agua en aceite, que ofrecen una mayor estabilidad de fase y diversidad que los sistemas de aceite en agua.
- Observaron que las configuraciones de las microsferas más grandes se mantuvieron sin cambios por las partículas más pequeñas, mientras que los arreglos de las partículas más pequeñas fueron dictados por las interacciones entre partículas.
- Los resultados experimentales fueron consistentes con las simulaciones de Surface Evolver.
Conclusiones:
- Las emulsiones de agua en aceite proporcionan una plataforma versátil para crear diversos grupos coloidales binarios.
- El comportamiento de autoensamblaje es ajustable en función del tamaño de la partícula, la composición y las interacciones entre partículas.
- Estos grupos no isotrópicos sirven como bloques de construcción para materiales avanzados, dispersores de luz, difusores y materia adaptativa.
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