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Taiana G.M. Bonadio,Valdirlei F. Freitas,T^ania T. Tominaga,Ricardo Y. Miyahara,Jaciele M. Rosso,Luiz F. C otica,Mauro L. Baesso,Wilson R. Weinandb,,Ivair A. Santos,Ruyan Guo,Amar S. Bhalla 한국물리학회 2017 Current Applied Physics Vol.17 No.5
Bioactive ferroelectric composites based on polyvinylidene fluoride, hydroxyapatite and b-tricalcium phosphate have been synthesized and their structural, microstructural, bioactive, and ferroelectric properties are characterized. Structural and FTIR investigations showed the presence of the polar polyvinylidene fluoride (b2) phase, while ferroelectric characterizations revealed remnant polarizations and coercive field, around 0.04 mC/cm2 and 28 kV/cm, respectively, for these biocompatible samples. Structural and microstructural analysis of samples previously immersed in simulated body fluid for 7 days revealed a large apatite phase growth (1.45 mm) on the composites' surfaces as a strong indication of their elevated bioactivity and potentialities for bone tissue engineering.
Ivair A. Santos,Jaciele M. Rosso,Luiz F. Cotica,Taiana G.M. Bonadio,Valdirlei F. Freitas,Ruyan Guo,Amar S. Bhalla 한국물리학회 2016 Current Applied Physics Vol.16 No.11
In this contribution, a promising environmentally friendly lead-free ferroelectric/polymer 0-3 composite, using polyvinylidene fluoride and barium sodium titanate niobate compounds, was synthesized and structurally and dielectrically characterized. The results suggest the complete formation of a 0-3 connected composite with enhanced dielectric properties, reaching a relative permittivity of 32 and a dissipation loss of 4%, at 1 kHz and 300 K, respectively. These dielectric features are associated with the intimate contact between the polymer and ceramic fraction in the composite that lead to the increase of the polar b-phase amount in the polymer fraction, at room temperature.