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Transiciones microestructurales impulsadas por la temperatura del sustrato en patrones secos de micropartículas

Sanjib Majumder1,2, Madivala G Basavaraj1,2, Dillip K Satapathy1,3,2

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Los microgeles de poliacrilamida (PNIPAM) forman monocapas ordenadas en las interfaces de fluidos, lo que permite la fabricación de películas coloidales. Su comportamiento sensible a la temperatura dicta patrones de deposición complejos, ofreciendo propiedades de materiales sintonizables.

Palabras clave:
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Área de la Ciencia:

  • Física de materia blanda
  • Ciencia de coloides
  • Ciencia de materiales

Sus antecedentes:

  • Los microgeles de poliacrilamida (PNIPAM) son coloides sensibles a estímulos con un comportamiento de hinchamiento sintonizable.
  • Los microgeles exhiben una cinética distinta en las interfaces fluido-fluido en comparación con el volumen, aplanándose y formando monocapas ordenadas.
  • Este comportamiento interfacial ofrece una ruta para la fabricación de películas coloidales y estructuras estampadas.

Objetivo del estudio:

  • Investigar el autoensamblaje y los patrones de deposición de microgeles de PNIPAM durante el secado de gotas sésiles.
  • Explorar la influencia de la temperatura y la concentración inicial de microgel en las morfologías de depósito resultantes.
  • Comprender el papel del comportamiento interfacial modulado térmicamente en la dirección del autoensamblaje de microgel.

Principales métodos:

  • Secado de gotas acuosas sésiles que contienen microgeles de PNIPAM sobre sustratos hidrofílicos a temperaturas controladas.
  • Monitorización in situ de la dinámica de evaporación de gotas mediante microscopía de vídeo y goniometría de ángulo de contacto.
  • Caracterización de las morfologías de los depósitos de microgel secos mediante microscopía de fuerza atómica (AFM).

Principales resultados:

  • Los microgeles de PNIPAM se adsorben y aplanan en la interfaz aire-agua, formando monocapas ordenadas.
  • Se observaron patrones de deposición complejos, que incluyen películas uniformes, patrones de anillo de café y anillos múltiples.
  • La morfología del depósito depende de la concentración inicial de microgel y la temperatura del sustrato.
  • La altura promedio de los microgeles secos aumenta con la temperatura del sustrato.
  • La heterogeneidad espacial en la altura del microgel sugiere que el comportamiento interfacial modulado térmicamente dirige el autoensamblaje.

Conclusiones:

  • Los microgeles de PNIPAM se pueden estampar en diversas estructuras controlando las condiciones de secado y la temperatura.
  • La temperatura juega un papel crucial en la modulación de la actividad interfacial y el autoensamblaje de microgel durante la evaporación.
  • Este estudio demuestra un método para fabricar películas coloidales sintonizables utilizando microgeles sensibles a la temperatura.