Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/3167
Título: Determination of diffusion coefficients of nanoparticles and humic substances using scanning stripping chronopotentiometry (SSCP)
Autor: Pinheiro, J. P.
Domingos, R. F.
Lopez, R.
Brayner, R.
Fiévet, F.
Wilkinson, K.
Palavras-chave: Diffusion coefficients
Nanoparticles
Humic matter
Stripping chronopotentiometry
Fluorescence correlation spectroscopy
Data: 2007
Editora: Elsevier
Citação: Pinheiro, J.P.; Domingos, R.F.; Lopez, R.; Brayner, R.; Fiévet, F.; Wilkinson, K.Determination of diffusion coefficients of nanoparticles and humic substances using scanning stripping chronopotentiometry (SSCP), Colloids and Surfaces A: Physicochemical and Engineering Aspects, 295, 1-3, 200-208, 2007.
Resumo: A methodology, based on a labile metal ion probe using stripping chronopotentiometry at scanned deposition potential (SSCP), is presented for the determination of the diffusion coefficients of nanoparticles and humic matter. The novel methodology was successfully applied to the determination of diffusion coefficients (and thus hydrodynamic diameters) of eight standard nanoparticles with radii ranging from 5 to 129 nm and two samples of colloidal humic substances with hydrodynamic radii of ca. 1 nm. Good agreement was found between the SSCP determinations and results obtained by dynamic light scattering (DLS), transmission electron microscopy (TEM) and fluorescence correlation spectroscopy (FCS). The SSCP technique is critically analysed with respect to its use for the determination of diffusion coefficients of colloidal complexes.
Peer review: yes
URI: http://hdl.handle.net/10400.1/3167
DOI: http://dx.doi.org/10.1016/j.colsurfa.2006.08.054
ISSN: 0927-7757
Versão do Editor: http://www.sciencedirect.com/science/article/pii/S092777570600673X
Aparece nas colecções:FCT2-Artigos (em revistas ou actas indexadas)

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