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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.

elementos/elementosbogotâa

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