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Cristales vivos de surfistas coloidales activados por la luz
Jeremie Palacci1, Stefano Sacanna, Asher Preska Steinberg
1Department of Physics, New York University, 4 Washington Place, New York, NY 10003, USA. jp153@nyu.edu
Science (New York, N.Y.)
|February 2, 2013
Resumen
Los investigadores crearon "cristales vivos" dinámicos a partir de partículas sintéticas activadas por la luz. Estas estructuras auto-organizadas se forman y se rompen debido a la propulsión competitiva y la atracción inducida por la luz, mostrando la física de no equilibrio en la materia artificial.
Área de la Ciencia:
- Física de la materia blanda Física de la materia blanda
- Física de la materia activa Física de la materia activa
- La ciencia coloidal es la ciencia coloidal.
Sus antecedentes:
- La autoorganización es una propiedad fundamental de los sistemas vivos, observada en colonias bacterianas y bandadas de aves.
- Comprender la autoorganización en sistemas sintéticos proporciona información sobre los principios físicos fundamentales y las aplicaciones potenciales.
Objetivo del estudio:
- Para demostrar la autoorganización en un sistema sintético utilizando partículas coloidales fotoactivadas.
- Investigar el comportamiento dinámico y los mecanismos de formación de "cristales vivos" bidimensionales.
Principales métodos:
- Utilizando una suspensión de partículas coloidales sintéticas fotoactivadas.
- Inducir la auto-organización a través de la activación de la luz, lo que lleva a los efectos osmóticos y foréticos.
- Emplear simulaciones numéricas para describir cuantitativamente las observaciones experimentales.
Principales resultados:
- Observó la formación espontánea, el ensamblaje dinámico y la disolución de "cristales vivos" bidimensionales.
- Identificó una competencia entre la autopropulsión de partículas y las interacciones atractivas inducidas por la luz.
- Se midió una transición de las fluctuaciones normales a las fluctuaciones de números gigantes.
Conclusiones:
- El ensamblaje dinámico de estos cristales vivos sintéticos es impulsado por fuerzas de no equilibrio.
- La existencia de estas estructuras está intrínsecamente ligada a colisiones fuera de equilibrio de partículas autopropulsadas.
- Este trabajo proporciona un sistema modelo para estudiar la autoorganización en la materia activa artificial.
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