Bioactive Multifunctiona Magnetoelectric Composites

Reference	Presenter	Authors (Institution)	Abstract
08-019	Valdirlei Fernandes Freitas	Freitas, V.F.(Universidade Estadual do Centro-Oeste); Bonadio, T.G.(Universidade Estadual do Centro-Oeste); Dias, G.S.(Universidade Estadual de Maringá); SANTOS, I.A.(Universidade Estadual de Maringá); Miyahara, R.Y.(Universidade Estadual do Centro-Oeste);	Novel multifunctional materials, such as (ferro)piezoelectric/bioactive composite (polyvinylidene fluoride-hydroxyapatite), have emerged as strong candidates for biomedical applications that can catalyze the bone growth by changing the ionic structure/settings of their surfaces by external stimuli (electric and magnetic fields). In this way, alternative technique using a Simulated Body Fluid (SBF) can be used to check the bioactivity properties in new compounds, which after of the experiment can be seen as a synthetic bone (apatite) layer growing in the surface of bioactive materials. In this work, binary and ternary multifunctional ferroelectric biocomposite ware synthesized from ferroelectric PVDF polymer, bioactive Hydroxyapatite and magnetic ${\mathrm{Fe}}_3{\mathrm{O}}_4$ ceramics. Its bioactivity was verified under the application of electric and magnetic fields in an experiment with SBF. Comparative experiment under and without external stimuli, reveal high bioactivity induced and/or catalyzed by magnetic and electric fields. Scanning Electron Microscopy showed an apatite layer recovering the composite surface that was submitted to the experimental procedures with SBF under external stimuli larger than without. Energy dispersive spectroscopy revealed the surface composition typical of a growing apatite layer under external stimuli experiment and a rich in fluoride composition, probably of the PVDF/composite surface, without stimuli. X ray diffraction pattern obtained from composite samples experienced under external stimuli indicated structural growing orientated in a specific direction, typical of the apatite growing. Finally, attenuated total reflectance in conjunction with infrared spectroscopy reveal substantial decrease of the PVDF ferroelectric polar $\mathrm{\beta }$-phase. This because in a surface analysis specific regions with $\beta$-phase can be overlapped by apatite layer. All these results indicate the bioactivity of the composites stimulated/induced by magnetic and electric fields.
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