By combining ultraviolet and visible absorption and elastic light scattering measurements we have studied the salt-induced aggregation kinetics of the porphyrin t-H2Pagg in aqueous solution, The temporal evolution of the spectra, directly related to the time dependence of the monomer concentration and the mean cluster size, shows unambiguously the presence of an early stage driven by a reaction limited aggregation. After a variable time (dependent on the salt concentration) a crossover to a diffusion-limited aggregation regime is observed. Elastic light scattering data confirm such a result.
Crossover in the kinetic growth process of porphyrin aggregation
MALLAMACE, Francesco;MONSU' SCOLARO, Luigi;ROMEO, Andrea;
1999-01-01
Abstract
By combining ultraviolet and visible absorption and elastic light scattering measurements we have studied the salt-induced aggregation kinetics of the porphyrin t-H2Pagg in aqueous solution, The temporal evolution of the spectra, directly related to the time dependence of the monomer concentration and the mean cluster size, shows unambiguously the presence of an early stage driven by a reaction limited aggregation. After a variable time (dependent on the salt concentration) a crossover to a diffusion-limited aggregation regime is observed. Elastic light scattering data confirm such a result.File in questo prodotto:
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