Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.1/3189 |
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. |
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Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systemsMetal speciationColloidal dispersionsLabilityStripping chronopotentiometryA 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.ElsevierSapientiaPinheiro, J. P.Domingos, R. F.Minor, M.Van Leeuwen, H. P.2013-12-02T15:35:56Z20062013-11-26T16:39:36Z2006-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.1/3189engPinheiro, 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, 2006.1572-6657AUT: JPI01020;http://dx.doi.org/10.1016/j.jelechem.2006.07.004info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-24T10:14:11Zoai:sapientia.ualg.pt:10400.1/3189Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T19:56:48.348366Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems |
title |
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems |
spellingShingle |
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems Pinheiro, J. P. Metal speciation Colloidal dispersions Lability Stripping chronopotentiometry |
title_short |
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems |
title_full |
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems |
title_fullStr |
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems |
title_full_unstemmed |
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems |
title_sort |
Metal speciation dynamics in colloidal ligand dispersions. Part 3: Lability features of steady-state systems |
author |
Pinheiro, J. P. |
author_facet |
Pinheiro, J. P. Domingos, R. F. Minor, M. Van Leeuwen, H. P. |
author_role |
author |
author2 |
Domingos, R. F. Minor, M. Van Leeuwen, H. P. |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Sapientia |
dc.contributor.author.fl_str_mv |
Pinheiro, J. P. Domingos, R. F. Minor, M. Van Leeuwen, H. P. |
dc.subject.por.fl_str_mv |
Metal speciation Colloidal dispersions Lability Stripping chronopotentiometry |
topic |
Metal speciation Colloidal dispersions Lability Stripping chronopotentiometry |
description |
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. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006 2006-01-01T00:00:00Z 2013-12-02T15:35:56Z 2013-11-26T16:39:36Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.1/3189 |
url |
http://hdl.handle.net/10400.1/3189 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
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. 1572-6657 AUT: JPI01020; http://dx.doi.org/10.1016/j.jelechem.2006.07.004 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133176846614528 |