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Deslizamiento y fluidización en rotores cristalinos activos

Abraham Mauleon-Amieva1,2, Tanniemola B Liverpool3, Ian Williams4

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Los coloides activos en cristales hexagonales exhiben una dinámica de deslizamiento de palo, en transición entre estados estáticos y deslizantes. Este comportamiento ofrece información sobre la fricción a nanoescala y el diseño de la materia activa.

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Área de la Ciencia:

  • La física
  • Ciencias de los materiales
  • Física de la materia blanda

Sus antecedentes:

  • La comensurabilidad rige la fricción a nanoescala y el rendimiento de los cristales en los sistemas de equilibrio.
  • Los conceptos de comensurabilidad están surgiendo en el estudio de la materia activa.
  • Los coloides activos ofrecen un sistema modelo para explorar fenómenos más allá de la física de equilibrio.

Objetivo del estudio:

  • Desarrollar una plataforma experimental y un marco teórico para coloides activos en cristales confinados.
  • Para investigar la interacción entre la actividad de las partículas y la estructura cristalina.
  • Para entender nuevas dinámicas como el auto-corte, la inversión de flujo, y el comportamiento activo de stick-slip.

Principales métodos:

  • Realización experimental de cristales coloidales activos utilizando rodillos de Quincke confinados en una geometría circular.
  • Concéntrese en las cristalinas perfectas hexagonales de 61 partículas.
  • Descripción teórica utilizando un modelo discretizado de hidrodinámica activa y un modelo extendido de Frenkel-Kontorova (FK).

Principales resultados:

  • Competición observada entre la solidez de las partículas y la autopropulsión que conduce a la autodestrucción y la inversión del flujo.
  • Descubrió la dinámica activa de stick-slip, caracterizada por transiciones entre estados estáticos y auto deslizantes proporcionales.
  • Identificación de fusión inducida por la actividad y defectos localizados durante el deslizamiento automático.

Conclusiones:

  • Los cristales coloidales activos exhiben una rica dinámica, incluido el comportamiento de deslizamiento de la vara impulsado por la autopropulsión.
  • Los hallazgos proporcionan un sistema modelo para comprender los sólidos activos y sus aplicaciones potenciales.
  • Esta investigación ofrece principios de diseño para el ensamblaje a nanoescala y la robótica utilizando materia activa.