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Monopolos coloidales elásticos y autoensamblaje reconfigurable en cristales líquidos
Ye Yuan1, Qingkun Liu1, Bohdan Senyuk1
1Department of Physics, University of Colorado, Boulder, CO, USA.
Nature
|May 31, 2019
Resumen
Los investigadores desarrollaron nuevos coloides nemáticos con monopolos elásticos conmutables. Estas partículas se reconfiguran usando luz, exhibiendo comportamientos atractivos y repulsivos únicos que no se ven en la electrostática, allanando el camino para los sistemas de materia activa.
Área de la Ciencia:
- Ciencia coloidal
- Física de la materia blanda
- Sistemas de cristales líquidos
Sus antecedentes:
- Las interacciones electrostáticas de tipo monopolio son comunes, pero a menudo se filtran y no se pueden cambiar.
- Las partículas coloidales normalmente no pueden cambiar su signo de carga superficial o orden multipolar.
- Las interacciones elásticas en coloides de cristal líquido imitan a los multipoles electrostáticos, pero los monopolos son inestables.
Objetivo del estudio:
- Para diseñar coloides nemáticos con momentos monopoles elásticos estables y conmutables.
- Investigar la reconfiguración y la dinámica de interacción de estas nuevas partículas coloidales.
- Explorar aplicaciones potenciales en materia activa y autoensamblaje.
Principales métodos:
- Desarrollo de coloides nemáticos con par óptico y elástico equilibrados.
- Demostración de la reconfiguración de monopolio a cuádrupolo inducida por la luz utilizando luz no estructurada.
- Observación y modelado de señales e interacciones de monopolio elástico sintonizable.
Principales resultados:
- Se han logrado monopolios elásticos estables en coloides nemáticos, superando la inestabilidad inherente.
- Se ha demostrado la reconfiguración impulsada por la luz, análoga a las transiciones de estado atómico.
- Se observaron interacciones únicas: los monopolos de carga similar se atraen, los de carga opuesta se repelen.
- Muestra un conjunto dinámico fuera de equilibrio impulsado por estas partículas coloidales.
Conclusiones:
- El equilibrio de los parámetros ópticos y elásticos estabiliza los monopolos elásticos de estado excitado.
- Estos coloides exhiben interacciones controlables y no electrostáticas y ensamblaje dinámico.
- Potencial para el desarrollo de materia activa alimentada por luz y nanomáquinas autoensambladas.
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