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La formación de la mesofase estabiliza los grupos de tamaño mágico de alta pureza

Douglas R Nevers1, Curtis B Williamson1, Benjamin H Savitzky2

  • 1Robert F. Smith School of Chemical and Biomolecular Engineering , Cornell University , Ithaca , New York 14850 , United States.

Journal of the American Chemical Society
|January 30, 2018
PubMed
Resumen
Este resumen es generado por máquina.

La síntesis de alta concentración produce grupos de tamaño mágico (MSC) de alta pureza mediante la formación de una mesofase orgánica-inorgánica estabilizadora. Esta mesofase impide el crecimiento de nanopartículas, ofreciendo una nueva comprensión de la estabilización de MSC más allá del empaque atómico.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Nanotecnología
  • Síntesis Química

Sus antecedentes:

  • Los grupos de tamaño mágico (MSC) exhiben una estabilidad única y un tamaño uniforme, inhibiendo el crecimiento de nanopartículas convencionales.
  • La comprensión de las vías de nucleación y estabilización de las MSC sigue siendo un desafío crítico de investigación.

Objetivo del estudio:

  • Investigar la influencia de la síntesis de altas concentraciones en la formación y la estabilidad de los MSC.
  • Para aclarar el papel de las fases de acompañamiento en la estabilización de MSC.

Principales métodos:

  • Síntesis de MSC en altas concentraciones (1000 mM).
  • Análisis de dispersión de rayos X in situ para estudiar las vías de reacción y la formación de fases.
  • Investigación del comportamiento de la MSC en diferentes concentraciones (500 mM, < 200 mM).

Principales resultados:

  • La síntesis de alta concentración (> 99,9% de pureza) produce MSCs altamente estables resistentes al crecimiento y la disolución.
  • Una mesofase orgánica-inorgánica grande y hexagonal formada en altas concentraciones detiene el crecimiento de MSC y previene la formación de nanopartículas.
  • Las concentraciones intermedias y bajas conducen a mesofasas inestables y a la formación de nanopartículas dominantes.

Conclusiones:

  • La estabilidad de MSC se puede atribuir a los conjuntos de mesofasa fibrosa que se forman a sí mismos, no solo al empaque atómico de caparazón cerrada.
  • La síntesis de altas concentraciones revela un comportamiento de fase dependiente de la concentración de los tensioactivos, crucial para la estabilización de la MSC.
  • Este trabajo proporciona un método sólido para sintetizar y estabilizar las MSC, destacando las interacciones surfactante-cluster.