Distribución del tamaño de partícula de la tetracarboxifenilporfirina de hierro (III) adsorbida sobre dióxido de silicio por dispersión dinámica de luz

• Diaz Uribe, Carlos Enrique ^[1] ; Vallejo, William ^[1] ; Miranda, Jarol ^[1]
  1. [1] Universidad del Atlántico
• Localización: Elementos, ISSN-e 2248-5252, Vol. 3, Nº. 3, 2013 (Ejemplar dedicado a: Elementos), págs. 187-195
• Idioma: español
• DOI: 10.15765/e.v3i3.424
• Títulos paralelos:
  • Particle size distribution of iron tetracarboxifenilporfirina (III) adsorbed on silicon dioxide by dynamic light scattering
• Enlaces
  • Texto completo (pdf)
• Resumen
  • español

    La distribución del tamaño de partícula es una propiedad fundamental para caracterizar sistemas de partículas en suspensión. Las porfirinas son sensibilizadores esenciales para diversas aplicaciones fotoquímicas, sin embargo estos sensibilizadores tienden a formar agregados en solución acuosa, afectando sus propiedades fotofísicas, lo que hace necesaria su inmovilización. En este trabajo se estudió la distribución del tamaño de partícula de la tetracarboxifenilporfirina de hierro (III) adsorbida sobre dióxido de silicio por la técnica de dispersión dinámica de luz. La estabilidad del proceso de adsorción depende del valor del pH, es por esto, que se estudió a un pH de 3 y 5. Se encontró un solo tamañode partícula a pH = 3 indicando la estabilidad de la porfirina sobre la silica, mientras que a pH = 5, dos tipos de partículas fueron encontradas. Los resultados indican que la técnica de dispersión dinámica de luz es adecuada para determinar la estabilidad de estos sistemas.

  • English

    Particle size distribution is a critical property for characterizing particles in suspension systems. Porphyrins are sensitizers essential for different photo-chemical applications, however these compounds form aggregates in aqueous solution, this phenomen changes its photophysical properties, due to this necessary to inmobilize the porphyrins. In this work, the particle size distribution of tetracarboxyphenyl porphyrin iron (III) adsorbed on silicon dioxide was studied by the technique of dynamic light scattering. Results indicate that the stability of the adsorption process depends on the pH value. It was observed a single particle size at pH = 3 indicating stability of the porphyrin on silica, while at pH = 5, two types of particles were found. The results indicate that the technique of dynamic light scattering is suitable for determining the stability of these systems.

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