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Superficies multifuncionales infundidas con ferrofluido con topografía reconfigurable en múltiples escalas
Wendong Wang1,2,3, Jaakko V I Timonen1,4, Andreas Carlson1,2,5
1John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, USA.
Nature
|June 27, 2018
Resumen
Desarrollamos una nueva superficie compuesta jerárquica magneto-responsiva llamada FLIPS. Este material adaptativo reconfigura su topografía bajo campos magnéticos, lo que permite diversas funciones, desde el autoensamblaje de partículas hasta la eliminación de biopelículas.
Área de la Ciencia:
- Ciencias de los materiales
- Física de la materia blanda
- Ciencias de la superficie
Sus antecedentes:
- Los materiales adaptativos con geometrías sensibles al estímulo ofrecen información sobre el control de la morfología y los sistemas dinámicos.
- Se han explorado superficies reconfigurables utilizando geles, polímeros y compuestos para el control de propiedades interfaciales.
- Los diseños existentes tienen cambios topográficos y alcance funcional limitados.
Objetivo del estudio:
- Introducir una nueva superficie compuesta jerárquica magneto-responsiva.
- Para demostrar las reconfiguraciones topográficas a escala múltiple y los comportamientos emergentes.
- Explorar las aplicaciones potenciales de estas superficies adaptativas.
Principales métodos:
- Infiltración de ferrofluido en una matriz microestructurada para crear superficies porosas con infusión de líquido que contengan ferrofluido (FLIPS).
- Aplicación de gradientes de campo magnético para inducir el movimiento del ferrofluido y los cambios topográficos.
- Análisis teórico y experimental de la dinámica de reconfiguración, equilibrando las presiones capilar y magnética.
Principales resultados:
- Se han demostrado reconfiguraciones topográficas jerárquicas de múltiples escalas impulsadas por campos magnéticos.
- Comportamientos emergentes observados, incluido el autoensamblaje de partículas coloidales (escala micrométrica).
- Se mostró el flujo regulado de gotas de líquido (escala milimétrica) y la adhesión conmutable, la fricción, el bombeo de líquidos y la eliminación de biopelículas (escala centímetrica).
Conclusiones:
- FLIPS ofrece una plataforma versátil para la topografía de superficies ajustables y funcionalidades multiscala.
- La reconfigurabilidad del sistema se rige por las fuerzas capilares y magnéticas, y la anisotropía geométrica.
- Las aplicaciones potenciales incluyen microfluidos, gestión térmica y materiales de liberación de suciedad.
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