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The Equilibrium Binding Constant and Binding Strength

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Crystal Field Theory
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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
07:26

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La unión electrostática entre autoensamblajes 2D y 3D de equilibrio.

Fredric M Menger1, Lei Shi

  • 1Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA. menger@emory.edu

Journal of the American Chemical Society
|May 14, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Las mediciones de la concentración de micela crítica (CMC) utilizando la tensión superficial pueden ser engañosas. Los aditivos pueden saturar la interfaz aire/agua, causando lecturas falsas del CMC, como se ve con el bromuro de dodecilo-trimetilamonio (DTAB) y los aditivos aniónicos.

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Área de la Ciencia:

  • Colloide y la química de las superficies.
  • Química Física es la química física.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los tensioactivos catiónicos como el bromuro de dodecilo-trimetilamonio (DTAB) son ampliamente utilizados.
  • La concentración crítica de micelas (CMC) es un parámetro clave, típicamente determinado por mediciones de tensión superficial.
  • La influencia de los aditivos aniónicos en el comportamiento de agregación de DTAB es de gran interés.

Objetivo del estudio:

  • Para investigar el efecto de los aditivos aniónicos con cargas variables en el CMC de DTAB.
  • Para conciliar las discrepancias entre la CMC derivada de la tensión superficial y las mediciones de propiedades a granel.
  • Para desafiar la suposición universal de que las rupturas de tensión superficial indican directamente la formación de micelas.

Principales métodos:

  • Preparación de soluciones con DTAB y seis aditivos aniónicos orgánicos en una proporción molar de 15:1.
  • Mediciones de la tensión superficial para determinar la CMC aparente.
  • Conductividad y difusión Mediciones de resonancia magnética nuclear (RMN) para el análisis de propiedades a granel.
  • Análisis de la formación del complejo DTAB/trianión en la interfaz aire/agua.

Principales resultados:

  • Los gráficos de tensión superficial mostraron una disminución significativa en la CMC aparente (hasta 10 veces) en presencia de aditivos aniónicos.
  • Las mediciones de conductividad y difusión por RMN arrojaron valores normales de CMC (alrededor de 14 mM) para las mezclas DTAB/trianión.
  • Se observó una discrepancia entre la CMC derivada de la tensión superficial y las mediciones a granel, particularmente con hexanion.

Conclusiones:

  • La interfaz aire/agua puede saturarse con complejos de aditivos DTAB/aniónicos por debajo de la concentración real de formación de micela.
  • Las rupturas de tensión superficial en las parcelas de CMC no siempre pueden indicar una verdadera formación de micela.
  • Repensar la interpretación de los datos de tensión superficial en presencia de aditivos específicos es necesario para un análisis químico preciso de coloides.