Effect of mechanical deformation on ionic transport in polimeric films. / Efeito da deformação mecânica no transporte iônico em filmes poliméricos.

AUTOR(ES)

Walter Katsumi Sakamoto

DATA DE PUBLICAÇÃO

1990

RESUMO

Recently a piezoelectric effect was found when a polymeric film, separating two electrolyte solutions at different concentrations, was deformed. This effect was attributed to the modulation of the mobility of the íons in the polymer. It was observed that the effect decreases as the electrolyte concentrations increases. In order to understand more deeply this last effect a study on water and salt transport through the polymer with and without deformation was carried out, and the results may be summarized as follows: a) An increase in hydration of the polymer leads to an increase in porosity and a decrease in cristallinity. b) An increase in the concentration of the salt leads to an increase in permeability, which is more pronounced in the presence of deformation. The effects make more difficult the modulation of the íons, so lower piezoelectric signals are observed.

ASSUNTO(S)

absorption potencial de membrana difusão absorção difusion permeabilidade ionic pair pares iônicos membrane potential permeability

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