Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3189
Título: Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems
Autor: Pinheiro, J. P.
Domingos, R. F.
Minor, M.
Van Leeuwen, H. P.
Palavras-chave: Metal speciation
Colloidal dispersions
Stripping chronopotentiometry
Data: 2006
Editora: Elsevier
Citação: Pinheiro, J. P.; Domingos, R. F.; Minor, M.; Van Leeuwen, H. P. Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems, Journal of Electroanalytical Chemistry, 596, 1, 57-64, 2006.
Resumo: A lability criterion is developed for dynamic metal binding by colloidal ligands with convective diffusion as the dominant mode of mass transport. Scanned stripping chronopotentiometric measurements of Pb(II) and Cd(II) binding by carboxylated latex core-shell particles were in good agreement with the predicted values. The dynamic features of metal ion binding by these particles illustrate that the conventional approach of assuming a smeared-out homogeneous ligand distribution overestimates the lability of a colloidal ligand system. Due to the nature of the spatial distribution of the binding sites, the change in lability of a metal species with changing ligand concentration depends on whether the ligand concentration is varied via manipulation of the pH (degree of protonation) or via the particle concentration. In the former case the local ligand density varies, whereas in the latter case it is constant. This feature provides a useful diagnostic tool for the presence of geometrically constrained binding sites.
Peer review: yes
URI: http://hdl.handle.net/10400.1/3189
DOI: http://dx.doi.org/10.1016/j.jelechem.2006.07.004
ISSN: 1572-6657
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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