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Ciência & Tecnologia dos Materiais

versão impressa ISSN 0870-8312

Resumo

FRANCO, P. Q.; SILVA, J.C.  e  BORGES, J.P.. Produção de fibras de hidroxiapatite por electrofiação. C.Tecn. Mat. [online]. 2010, vol.22, n.1-2, pp.57-64. ISSN 0870-8312.

This paper reports a new method of producing hydroxyapatite (HA) fibres, combining electrospinning and a non-alcoxide sol-gel system, using cheap precursors. Phosphorus pentoxide (P2O5) and calcium nitrate tetrahydrate (Ca(NO3)2.4H2O) were used as precursors of phosphorus and calcium, respectively. The fibres were electrospun from a mixture of the gel formed from the system Ca(NO3)2.4H2O/P2O5 with polymeric solutions of polyvinylpyrrolidone (PVP) in water and ethanol/water mixtures. The fibres were analyzed for their morphology (Scanning Electron Microscopy, SEM), chemical composition (Fourier Transform Infrared Spectroscopy, FTIR) and structure (X-ray diffraction, XRD). Nano and microfibres were obtained, composed mainly of type B carbonated HA with traces of calcium oxide (CaO) and β-tricalcium phosphate (β-TCP). From SEM analysis it was found that higher concentration of PVP in the electrospinning solutions leads to the formation of cylindrical fibres and that a larger amount of water allows for smaller diameter fibres and narrow diameters distribution. HA fibres produced have potential use either in Biotechnology (eg. Ion-exchange membranes) and Biomedicine (eg. Scaffolds for Tissue Engineeering).

Palavras-chave : Hydroxyapatite; Sol-gel; Electrospinning; Microfibres; Nanofibres.

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