Mass transport on composite dense PDMS membranes with palladium nanoclusters

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

Lúcia Brandão (Autor) FEUP; Luis Madeira (Autor) FEUP; Adélio Mendes (Autor) FEUP

Revista

Título: Journal of Membrane Science

Vol. 288 Nº 1

Páginas: 112-122

ISSN: 0376-7388

Editora: Elsevier

Indexação

ISI Web of Knowledge - 23 Citações

ISI Web of Science

Scopus - 23 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

Outras Informações

ID Authenticus: P-004-C20

DOI: 10.1016/j.memsci.2006.10.052

Abstract (EN): Sorption, diffusion and permeability coefficients of argon, hydrogen, propane, propylene and propyne were determined for unfilled poly(dimethylsiloxane) (PDMS) membranes at 308 K and for PDMS membrane filled with palladium nanoclusters (5 wt.%). Time-lag and sorption methods were used to obtain kinetic and equilibrium relevant parameters for characterizing the mass transport. Mass transport in a PDMS composite membrane differs from the corresponding unfilled membrane mainly during the transient regime, when a concentration profile is being settling down across the membrane thickness. The presence of the palladium nanoclusters, modifies the mass transport during the transient regime not only because the nanoclusters can act as adsorption wells (mainly in the case of hydrogen), but also because they lead to a tortuosity increase. At steady-state condition the relevant parameters that characterize the transport are the sorption and diffusion coefficients in the polymeric matrix, the filler volume content and the tortuosity. All experiments were successfully modelled using parameters obtained from independent experiments.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11