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Determination of the parameters affecting electrospun chitosan fiber size distr...
Lanceros-Méndez, S.; Sencadas, V.; Correia, D. M.; Gómez Ribelles, J. L.; Botelho, Gabriela; Areias, A. C.; Fonseca, A. Maurício C.; Neves, I. C.The production of chitosan nanofiber mats by electrospinning presents serious difficulties due to the lack of suitable solvents and the strong influence of processing parameters on the fiber properties. Two are the main problems to be solved: to control the properties of the solution in order to obtain large area uniform fiber mats by having a stable flow rate and to avoid sparks during the process, dam...
Evaluation of ion exchange-modified Y and ZSM5 zeolites in Cr(VI) biosorption a...
Silva, Bruna; Figueiredo, Hugo; Soares, O. S. G. P.; Pereira, M. F. R.; Figueiredo, J. L.; Lewandowska, A. E.; Bañares, M. A.; Bañares, M. A.The aim of this work was the evaluation of the performance of two zeolites with different structures (FAU and MFI) and acidity properties in the biosorption of Cr(VI) and catalytic oxidation of ethyl acetate. The starting zeolites, Y (FAU) and ZSM5 (MFI), were modified by ion exchange treatments with NaNO3 in order to obtain zeolites with different acidity and sodium content. A biosorption system consisting of ...
Nucleation of the electroactive β-phase and enhancement of the optical transpar...
Lopes, A. C.; Costa, Carlos M.; Tavares, C. J.; Neves, I. C.; Lanceros-Méndez, S.Poly(vinylidene fluoride), PVDF, based nanocomposites with different clays structures have been processed by solvent casting and melt crystallisation. Depending on the melting temperature of the polymer, the nanocomposite recrystalises in the electroactive or non electroactive β-phase of the polymer. This fact is related to the thermal behaviour of the clay. For montmorillonite clay, the full crystallisation...
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