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La cooperatividad espacial en flujos vidriosos blandos.

J Goyon1, A Colin, G Ovarlez

  • 1LOF, Université Bordeaux 1, UMR CNRS-Rhodia-Bordeaux 1 5258, 33608 Pessac cedex, France.

Nature
|July 4, 2008
PubMed
Resumen
Este resumen es generado por máquina.

Los materiales amorfos fluidos como las emulsiones exhiben un comportamiento complejo. Una simple regla de flujo no local, no local, explica su movimiento, revelando dinámicas cooperativas en estados congestionados.

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Área de la Ciencia:

  • Reología Reología.
  • Física de la materia blanda Física de la materia blanda
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los materiales amorfos (emulsiones, pastas, vidrios) exhiben un flujo complejo entre los estados sólido y líquido.
  • Sus relaciones entre la tasa de estrés y la deformación son fuertemente no lineales, un fenómeno poco comprendido.
  • Estos materiales son cruciales en diversas aplicaciones, incluidos los recubrimientos.

Objetivo del estudio:

  • Para investigar el comportamiento de flujo de las emulsiones concentradas en capas finas confinadas.
  • Para determinar si una regla de flujo local o no local rige su reología.
  • Comprender el papel del confinamiento, la rugosidad de la superficie y la concentración en la dinámica de flujo.

Principales métodos:

  • Utilizó velocimetría microfluídica para medir perfiles de velocidad.
  • Flujo caracterizado en finas capas de emulsión confinadas entre superficies de diferentes espesores y rugosidades.
  • Los datos analizados para identificar los efectos de tamaño finito y la naturaleza de la regla de flujo.

Principales resultados:

  • Efectos observados de tamaño finito que influyen en el comportamiento del flujo.
  • No se encontraron pruebas de una regla intrínseca de flujo local.
  • Se demostró que una simple regla de flujo no local describe con precisión todos los perfiles de velocidad observados.
  • No localidad de flujo cuantificada con una longitud de cooperatividad característica, que aumenta con la concentración en estados congestionados.

Conclusiones:

  • La reología de los materiales amorfos confinados se rige por reglas de flujo no locales, no locales.
  • Una escala de longitud característica de la cooperatividad surge en los estados atascados, ausente en los estados líquidos.
  • Estos hallazgos sugieren principios universales que rigen los sistemas vidriosos, atascados y granulares.