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Sólidos Activos: Auto-propulsión de Defectos Topológicos sin Flujo

Fridtjof Brauns1, Myles O'Leary2, Arthur Hernandez3

  • 1Kavli Institute for Theoretical Physics, University of California, Santa Barbara, Santa Barbara, California 93106, USA.

Physical review letters
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Resumen

Los defectos topológicos auto-propulsados en sólidos activos se mueven mediante remodelación de la textura, no por flujo. Este nuevo mecanismo difiere de los fluidos activos y puede explicar la morfogénesis y regeneración de tejidos.

Palabras clave:
Sólidos activosDefectos topológicosAuto-propulsiónFísica de materia blandaMateriales activosFísica biológicaMorfogénesisRegeneración

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Área de la Ciencia:

  • Física de Materia Blanda
  • Ciencia de Materiales
  • Biofísica

Sus antecedentes:

  • Los defectos topológicos en fluidos nemáticos activos exhiben auto-propulsión debido a los campos de flujo que generan.
  • La comprensión de la dinámica de defectos en materiales activos similares a sólidos es crucial para los procesos biológicos.

Objetivo del estudio:

  • Proponer y analizar un modelo mínimo para defectos topológicos auto-propulsados en sólidos nemáticos activos.
  • Elucidar el mecanismo de movimiento de defectos en medios elásticos con tensión activa.

Principales métodos:

  • Desarrollo de un modelo teórico mínimo para un sólido nemático activo.
  • Análisis de la dinámica de defectos que surge del acoplamiento de la textura nemática y las deformaciones elásticas.
  • Investigación de la desvinculación de pares de defectos y la estabilización.

Principales resultados:

  • Los defectos +1/2 auto-propulsados se mueven por remodelación local de la textura nemática, independientemente de la advección.
  • Este mecanismo difiere fundamentalmente de la auto-propulsión en fluidos nemáticos activos.
  • El modelo predice la desvinculación de pares de defectos y la estabilización de defectos +1.

Conclusiones:

  • La auto-propulsión de defectos en sólidos activos ocurre a través de un novedoso mecanismo de remodelación local de la textura.
  • Este mecanismo ofrece información sobre la reconfiguración del orden orientacional durante la morfogénesis, como en las fibras musculares.
  • Los hallazgos pueden explicar la motilidad y fusión de defectos en la regeneración de tejidos, como en Hydra.