Publications

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Conference Proceedings
Madeira, R. M. D., T. Vieira, J. C. Silva, I. R. Oliveira, J. P. Borges, M. M. R. A. Lima, and C. M. Lança, "Piezoelectric Calcium Modified Barium Titanate for Bone Regeneration", Materials Proceedings 2022, Vol. 8, Page 121, vol. 8, no. 1, Basel Switzerland, Multidisciplinary Digital Publishing Institute, pp. 121, jul, 2022. Abstract

Solid state reaction was used to produced barium titanate modified with calcium (BCT) showing the presence of the piezoelectric tetragonal phase after sintering at 1350 °C. Bioglass 45S5 (BG) was synthetized by sol-gel route. From these two materials and commercial hydroxyapatite (HAp) were obtained composites. The BG produced showed some cytotoxic character that was weakened by passivation. All other materials were non-cytotoxic. Contact polarization at constant temperature was chosen composites polarization. Electric/dielectric properties were evaluated by thermally stimulated depolarization currents (TSDC). The material showed bioactivity with the composite with BCT/BG/HAp 90/5/5 (wt%) showing increased bioactivity. In vitro test showed high proliferation rates for the composites.

Conference Paper
ER, N., D. CJ, L. MC, I. R, I. P, and M. - M. JN, "Charge Carriers Injection/Extraction at the Metal-Polymer Interface and Its Influence in the Capacitive Microelectromechanical Systems-Switches Actuation Voltage", JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, vol. 10: Univ Nova Lisboa, pp. 2503-2511, Jan, 2010. Abstract
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Lanca, M. C.;Dias,;D. C. J. Gupta, D. K.;Marat-Mendes, and J., Comparative study of dielectric relaxation spectra of electrically and thermally aged low density polyethylene, , pp. 161-164, Jan, 2003. Abstract
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Lanca, M. C.;Neagu, E. R.;Marat-Mendes, and J. N., Comparative study of space charge in aged low-density polyethylene and crosslinked polyethylene, , pp. 209-212, Jan, 2004. Abstract
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Lanca, M. C.;Neagu, E. R.;Marat-Mendes, and J. N., Comparative study of space charge in aged low-density polyethylene and crosslinked polyethylene, , pp. 209-212, Jan, 2004. Abstract
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MC, L., and M. - M. S. J, "Dielectric breakdown statistics of polyethylene for progressively-censored data", Advanced Materials Forum Ii, vol. 455-456, no. 455-456, pp. 602-605, Jan, 2004. Abstract
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MC, L., D. CJ, D. G. DK, and M. - M. S. J, "Dielectric properties of electrically aged low density polyethylene", Advanced Materials Forum I, vol. 230-2, no. 230-232, pp. 396-399, Jan, 2002. Abstract
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Lança, C. M., E. R. Neagu, C. Dias, and J. Marat-Mendes, Dielectric spectra of natural cork and derivatives, , vol. 356, pp. 763-767, Jan, 2010. Abstract
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R., N. E., C. Dias, L. M. Carmo, I. R., I. P., and M. - M. J. N., Discrimination between Space Charge and Dipolar Contributions in Ferroelectric Polymers, , pp. 145-146, Jan, 2011. Abstract
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R., N. E., C. Dias, L. M. Carmo, I. R., I. P., and M. - M. J. N., "Discrimination between Space Charge and Dipolar Contributions in Ferroelectric Polymers", 14th International Symposium on Electrets, 2011. Abstract

The final thermally stimulated discharge current method allows a better selection of the experimental conditions for sample polarization. By decreasing the ratio between the charging time and the discharging time, the apparent peak is of the same order of magnitude as the genuine peaks and there is only a partial overlap between then. Two peaks have been identified for polyamide 11, one associated with the glass transition around 60 °C and the second associated with the Curie transition around 96 °C.

ER, N., N. RM, D. CJ, L. MC, I. P, and M. - M. JN, Electrical Method to Study the Weak Molecular Movements at Nanometric Scale in Low Mobility Materials, , vol. 636-637, pp. 430-436, Jan, 2010. Abstract
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MC, L., P. S, N. ER, G. L, S. PC, and M. - M. S. J, "Electrical Properties Studies of a Cork/TetraPak (R)/Paraffin Wax Composite", Advanced Materials Forum Iv, vol. 587-588, no. 587-588, pp. 613-617, Jan, 2008. Abstract
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Neagu, E. R.;Neagu, R. M.;Lanca, M. C.;Vassilikou-Dova, A.;Marat-Mendes, and J. N., Identification of an apparent peak by use of the final thermally stimulated discharge current technique, , pp. 296-299, Jan, 2005. Abstract
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A., P., L. A. N. Ç. A. M.C., B. J.P., N. E. A. G. U. E.R., D. I. A. S. C.J., Marat-Mendes, and J.N., Influence of Polarization on the Bioactivity of Nanopowders of Hydroxyapatite, , pp. 55-56, Jan, 2011. Abstract
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A., P., L. A. N. Ç. A. M.C., B. J.P., N. E. A. G. U. E.R., D. I. A. S. C.J., Marat-Mendes, and J.N., "Influence of Polarization on the Bioactivity of Nanopowders of Hydroxyapatite", 14th International Symposium on Electrets, 2011. Abstract
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J, M., L. MC, and M. - M. S. J, "Infrared spectroscopy studies of aged polymeric insulators", Advanced Materials Forum I, vol. 230-2, pp. 384-387, Jan, 2002. Abstract
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ER, N., D. CJ, L. MC, I. R, and M. - M. JN, Medium Electric Field Electron Injection/Extraction at Metal-Dielectric Interface, , no. 636-637, pp. 437-443, Jan, 2010. Abstract
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ER, N., D. CJ, L. MC, I. R, and M. - M. JN, Medium Electric Field Electron Injection/Extraction at Metal-Dielectric Interface, , vol. 636-637, pp. 437-443, Jan, 2010. Abstract
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RM, N., N. ER, L. MC, and M. - M. JN, "New Experimental Facts Concerning the Thermally Stimulated Discharge Current in Dielectric Materials", Advanced Materials Forum Iv, vol. 587-588, no. 587-588, pp. 328-332, Jan, 2008. Abstract
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ER, N., D. CJ, L. MC, I. R, I. P, and M. - M. JN, On the width of the thermally stimulated discharge current peak, , Jan, 2010. Abstract
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MC, L., N. ER, D. LA, and M. - M. S. J, "Space charge studies in XLPE from power cables using combined isothermal and thermostimulated current measurements", Advanced Materials Forum Iii, Pts 1 and 2, vol. 514-516, no. 514-516, pp. 935-939, Jan, 2006. Abstract
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MC, L., N. ER, and M. - M. JN, "Space charge studies of aged XLPE using combined isothermal and thermostimulated current measurements", Cross-Disciplinary Applied Research in Materials Science and Technology, vol. 480-481, no. 480, pp. 501-505, Jan, 2005. Abstract
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Lanca, M. C.;Neagu, E. R.;Marat-Mendes, and J. N., Studies of space charge in electrically aged low density polyethylene, , pp. 19-22, Jan, 2002. Abstract
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MC, L., N. ER, S. P, G. L, and M. - M. S. J, "Study of electrical properties of natural cork and two derivative products", Advanced Materials Forum Iii, Pts 1 and 2, vol. 514-516, no. 514-516, pp. 940-944, Jan, 2006. Abstract
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ER, N., D. CJ, L. MC, I. R, I. P, and M. - M. JN, The study of the molecular movements in the range of glass transition by the final thermally stimulated discharge current technique, , Jan, 2010. Abstract
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