Research output

Research output per year 1992 1997 2002 2004 2005 2011 2015

• 17 Conference contribution
• 16 Article
• 3 Conference article
• 3 Other contribution
• 2 More
  • 1 Chapter
  • 1 Letter

Research output per year

Research output per year

Search results

• 2015

  Space charge and dipolar charge contribution at polar polymers polarization

  Neagu, E. R., Lança, M. C., Dias, C. J. & Marat-Mendes, J. N., 1 Jun 2015, In: Ieee Transactions On Dielectrics And Electrical Insulation. 22, 3, p. 1419-1426 8 p., 7116332.

  Research output: Contribution to journal › Article › peer-review

  • Electric space charge 100%
  • Polarization 68%
  • Polymers 55%
  • Temperature 30%
  • Electrodes 23%
• 2014

  Electrical polarization of a chitosan-hydroxyapatite composite

  Silva, J. A. M. D. C., Lança, M. D. C. H., Borges, J. P. M. R. & Marat-mendes, J. N., 1 Jan 2014, Baltimore, USA : Institute of Electrical and Electronics Engineers (IEEE).

  Research output: Other contribution

• Space Charge and Dipolar Charge Contribution at Polar Polymers Polarization

  Neagu, E., Lança, M. D. C. H., Dias, C. J. M. M. & Marat-mendes, J. N., 1 Jan 2014, Baltimore, USA : Institute of Electrical and Electronics Engineers (IEEE).

  Research output: Other contribution
• 2013

  Electrical characterization of biphasic ceramics used in hard tissue replacement

  Neagu, E., Dias, C. J. M. M., Lança, M. D. C. H., Borges, J. P. M. R. & Marat-mendes, J. N., 1 Jan 2013, Coimbra Portugal

  Research output: Other contribution

• Water Content Control To Improve Space Charge Storage in a Cork Derivative

  Neagu, E., Dias, C. J. M. M., Lança, M. D. C. H. & Marat-mendes, J. N., 1 Jan 2013, Materials Science Forum. Vol. 730-732. p. 395-400

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  Open Access
• 2012

  Water Content Control to Improve Space Charge Storage in a Cork Derivative

  Neagu, E., Dias, C. J. M. M., Lança, M. D. C. H. & Marat-mendes, J. N., 1 Jan 2012, Materials Science Forum. p. 395-400

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  Open Access
• 2011

  Discrimination between Space Charge and Dipolar Contributions in Ferroelectric Polymers

  Neagu, E., Dias, C. J. M. M., dos Reis Inácio, P. A., Igreja, R. A. G. B. D. N., Lança, M. D. C. H. & Marat-mendes, J. N., 1 Jan 2011, International Symposium on Electrets. p. 145-146

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  Open Access

• Electrical properties of cork and derivatives

  Neagu, E., Dias, C. J. M. M., Lança, M. D. C. H. & Marat-mendes, J. N., 1 Jan 2011, In: Ciência & Tecnologia dos Materiais. 23, 3/4, p. 64-70

  Research output: Contribution to journal › Article › peer-review

• Influence of Polarization on the Bioactivity of Nanopowders of Hydroxyapatite

  Neagu, E., Dias, C. J. M. M., Lança, M. D. C. H., Marat-mendes, J. N. & Borges, J. P. M. R., 1 Jan 2011, International Symposium on Electrets. p. 55-56

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  Open Access
• 2009

  The study of molecular movements in dielectrics using isothermal and non-isothermal current measurements

  Neagu, E. R., Dias, C. J., Lança, M. D. C. & Marat-Mendes, J. N., 2009, In: Journal of Physics: Conference Series. 183, 012012.

  Research output: Contribution to journal › Conference article › peer-review

  Open Access

  File

  • trapping 100%
  • dipoles 47%
  • electric charge 35%
  • polarization 34%
  • charging 30%
  16 Downloads (Pure)
• 2008

  Electrical properties studies of a Cork/TetraPak®/Paraffin wax composite

  Lança, M. C., Peuckert, S., Neagu, E. R., Gil, L., Silva, P. C. & Marat-Mendes, J., 1 Dec 2008, In: Materials Science Forum. 587-588, p. 613-617 5 p.

  Research output: Contribution to journal › Conference article › peer-review

  • Paraffin waxes 100%
  • waxes 92%
  • paraffins 86%
  • Wax 80%
  • Electric properties 76%
  2 Citations (Scopus)
• 2007

  Influence of humidity on the electrical charging properties of cork agglomerates

  Neagu, E., Lança, M. D. C. H. & Marat-mendes, J. N., 1 Jan 2007, In: Journal of Non-Crystalline Solids. 353, 47-51, p. 4501-4505

  Research output: Contribution to journal › Article › peer-review

  Open Access
  5 Citations (Scopus)

• Space charge analysis of electrothermally aged XLPE cable insulation

  Neagu, E., Lança, M. D. C. H. & Marat-mendes, J. N., 1 Jan 2007, In: Journal of Non-Crystalline Solids. 353, 47-51, p. 4462-4466

  Research output: Contribution to journal › Article › peer-review

  Open Access
  12 Citations (Scopus)
• 2006

  Development of an ultrasonic motor based on a piezoelectric ceramic sandwiched between two laminate composite plates

  Basílio, A., Igreja, R., Inácio, P., Dias, C. & Marat-Mendes, J., 1 Dec 2006, Advanced Materials Forum III - Proceedings of the 3rd International Materials Symposium 2005 and 12th Encontro da Sociedade Portuguesa de Materiais - SPM. Vilarinho, P. M. (ed.). Pt. 1 ed. Trans Tech Publications, p. 221-224 4 p. (Materials Science Forum; vol. 514-516, no. PART 1).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Piezoelectric ceramics 100%
  • piezoelectric ceramics 80%
  • laminates 67%
  • Laminates 65%
  • Ultrasonics 61%
• 2005

  Comparative study of space charge in the polymeric insulation of power cables using PEA, isothermal and non-isothermal currents measurements

  Lança, M. C., Fu, M., Neagu, E. R., Dissado, L. A., Marat-Mendes, J. N., Tzimas, A. & Zadeh, S., 1 Dec 2005, 2005 12th International Symposium on Electrets, ISE 12 - Proceedings. Giacometti, J. A., Oliveira Jr., O. N. & Faria, R. M. (eds.). Piscataway: Institute of Electrical and Electronics Engineers (IEEE), Vol. 2005. p. 284-287 4 p. 1612377. (Proceedings - International Symposium on Electrets; vol. 2005).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • electroacoustics 100%
  • Electric space charge 97%
  • Space Charge 94%
  • Electric current measurement 87%
  • cables 73%
  3 Citations (Scopus)

• Identification of an apparent peak by use of the final thermally stimulated discharge current technique

  Neagu, E., Neagu, R. M., Lança, M. D. C. H., Vassilikou-Dova, A. B. & Marat-mendes, J. N., 2005, 2005 12th International Symposium on Electrets, ISE 12 - Proceedings. Giacometti, J. A., Oliveira Jr., O. N. & Faria, R. M. (eds.). Piscataway: Institute of Electrical and Electronics Engineers (IEEE), p. 296-299 4 p. 1612380. (Proceedings - International Symposium on Electrets; vol. 2005).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Space Charge 100%
  • Glass Transition 83%
  • Charge trapping 61%
  • Reaction Activation Energy 54%
  • Conductivity 52%
  1 Citation (Scopus)

• The time as a parameter to investigate the landscape of the apparent activation energies in the final thermally stimulated discharge current measurements

  Neagu, E. R., Neagu, R. M., Carmo Lança, M. D. & Marat-Mendes, J. N., 2005, 2005 12th International Symposium on Electrets, ISE 12 - Proceedings. Giacometti, J. A., Oliveira Jr., O. N. & Faria, R. M. (eds.). Piscataway: Institute of Electrical and Electronics Engineers (IEEE), p. 292-295 4 p. 1612379. (Proceedings - International Symposium on Electrets; vol. 2005).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Electric current measurement 100%
  • Activation energy 88%
  • activation energy 62%
  • Reaction Activation Energy 58%
  • charging 39%
  1 Citation (Scopus)

• Ultrasound role in sol-gel processing of PbTiO₃ ceramics

  Chilibon, I., Marat-Mendes, J., Igreja, R. & Dias, C. J., 1 Jan 2005, In: Journal Of Optoelectronics And Advanced Materials. 7, 5, p. 2727-2735 9 p.

  Research output: Contribution to journal › Article › peer-review

  • Lead titanate 100%
  • Sol-gels 75%
  • Sol-Gel Processing 74%
  • Ultrasonics 49%
  • Powders 46%
  10 Citations (Scopus)
• 2004

  A piezoelectric pseudo-composite polymer film for the detection of proteins

  Inácio, P., Marat-Mendes, J. N. & Dias, C. J. M. M., 1 Jan 2004, Materials Science Forum. Vol. 455-456. p. 411-414 4 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  Open Access

  • proteins 100%
  • composite materials 76%
  • polymers 72%
  • piezoelectric crystals 54%
  • surface acoustic wave devices 53%

• Comparative study of space charge in aged low-density polyethylene and crosslinked polyethylene

  Neagu, E., Lança, M. D. C. H. & Marat-mendes, J. N., 2004, Proceedings of the 2004 IEEE International Conference on Solid Dielectrics ICSD 2004. Institute of Electrical and Electronics Engineers (IEEE), p. 209-212 4 p. 2P-11. (Proceedings of the 2004 IEEE International Conference on Solid Dielectrics ICSD 2004; vol. 1).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Electric space charge 100%
  • Low density polyethylenes 96%
  • Polyethylenes 79%
  • Relaxation time 65%
  • Electric current measurement 59%

• Dielectric breakdown statistics of polyethylene for progressivelycensored data

  Lança, M. C. & Marat-Mendes, J., 29 Jul 2004, In: Materials Science Forum. 455-456, p. 602-606 5 p.

  Research output: Contribution to journal › Conference article › peer-review

  • Electric breakdown 100%
  • Polyethylenes 93%
  • polyethylenes 79%
  • Dielectric Material 78%
  • statistics 69%

• Isothermal and non-isothermal DC measurements to analyze space charge behavior in polyamide 11

  Neagu, R. M., Neagu, E., Dias, C. J. M. M. & Marat-mendes, J. N., 1 Jan 2004, MATERIALS SCIENCE FORUM. Vol. 455-456. p. 450-454 5 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  Open Access

  • space charge 100%
  • direct current 89%
  • trapping 44%
  • injection 41%
  • charging 26%

• Recent Advances in Ceramic-polymer Composite Electrets

  Dias, C. J., Igreja, R., Marat-Mendes, R., Inácio, P., Marat-Mendes, J. N. & Das-Gupta, D. K., 1 Feb 2004, In: Ieee Transactions On Dielectrics And Electrical Insulation. 11, 1, p. 35-40 6 p.

  Research output: Contribution to journal › Article › peer-review

  • Electrets 100%
  • Polymers 47%
  • Composite materials 37%
  • Powders 17%
  • Polyether ether ketones 14%
  37 Citations (Scopus)

• Space Charge Studies in LDPE Using Combined Isothermal and Non-isothermal Current Measurements

  Lança, M. D. C. H., Neagu, E., Neagu, R. M., Dias, C. J. M. M., Marat-mendes, J. N. & Das-Gupta, D. K., Feb 2004, In: Ieee Transactions On Dielectrics And Electrical Insulation. 11, 1, p. 25-34 10 p.

  Research output: Contribution to journal › Article › peer-review

  • Electric space charge 100%
  • Low density polyethylenes 96%
  • Electric current measurement 89%
  • Charge trapping 59%
  • Relaxation time 48%
  13 Citations (Scopus)
• 2003

  Comparative study of dielectric relaxation spectra of electrically and thermally aged low density polyethylene

  Lança, M. D. C. H., Dias, C. J. M. M., Das-Gupta, D. K. & Marat-mendes, J. N., 2003, 2003 Annual Report Conference on Electrical Insulation and Dielectric Phenomena: October 19-22, 2003: Hyatt Regency Albuquerque: Albuquerque, New Mexico, USA. Piscataway: IEEE Dielectrics and Electrical Insulation Society, p. 161-164 4 p. (Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), Annual Report).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Dielectric relaxation 100%
  • Low density polyethylenes 73%
  • Aging of materials 46%
  • Charge injection 20%
  • Electric space charge 19%
  3 Citations (Scopus)
• 2002

  Dielectric characterization of PEBA and PDMS for capacitive interdigital vapour sensors

  Igreja, R. A. G. B. D. N., Marat-mendes, J. N. & Dias, C. J. M. M., 10 Dec 2002, 11th International Symposium on Electrets (ISE11): 1-3 October 2002 Novotel Hotel, Glen Waverley, Melbourne, Australia: Proceedings. Piscataway: Institute of Electrical and Electronics Engineers (IEEE), Vol. 1. p. 283-286 4 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  Open Access

  • wines 100%
  • fermentation 71%
  • vapors 51%
  • sensors 41%
  • capacitance 41%
  3 Citations (Scopus)

• Smart materials: the functional properties of ceramic/polymer composites and their relation to sol-gel powder preparation

  Igreja, R., Dias, C. J. & Marat-Mendes, J. N., 2 Dec 2002, Advanced Materials Forum I: Proceedings of the 1st International Materials Symposium (Materials 2001). Vieira, T. (ed.). Trans Tech Publications, p. 177-180 4 p. (Key Engineering Materials; vol. 230-232).

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Lead titanate 100%
  • Sol-gels 75%
  • Smart Material 73%
  • Intelligent materials 71%
  • Crystallization 62%
  6 Citations (Scopus)

• Studies of space charge in electrically aged low density polyethylene

  Neagu, E., Lança, M. D. C. H. & Marat-mendes, J. N., 2002, 11th International Symposium on Electrets (ISE11): 1-3 October 2002 Novotel Hotel, Glen Waverley, Melbourne, Australia: Proceedings. Piscataway: Institute of Electrical and Electronics Engineers (IEEE), p. 19-22 4 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Charging time 100%
  • Electric space charge 99%
  • Relaxation time 97%
  • Low density polyethylenes 96%
  • Space Charge 95%
  4 Citations (Scopus)

• Very low frequency dielectric relaxation deduced from time domain measurements

  Neagu, E., Marat-Mendes, J. N., Dias, C. J. M. M. & Neagu, R. M., 1 Jan 2002, KEY ENGINEERING MATERIALS. Vol. 230-2. p. 579-582 4 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • very low frequencies 100%
  • charging 36%
  • decay 22%
  1 Citation (Scopus)
• 2001

  Combined isothermal and non-isothermal techniques to analyze charge trapping and stability in insulating materials

  Neagu, E. R. & Marat-Mendes, J. N., 1 Nov 2001, In: Japanese Journal of Applied Physics, Part 2: Letters. 40, 11 A, p. L1160-L1162 3 p.

  Research output: Contribution to journal › Letter › peer-review

  • Charge trapping 100%
  • Insulating materials 79%
  • teflon (trademark) 75%
  • Polytetrafluoroethylenes 73%
  • insulation 60%
  29 Citations (Scopus)

• The Fractal Analysis of Water Trees An Estimate of the Fractal Dimension

  Lança, M. C., Marat-Mendes, J. N. & Dissado, L. A., Oct 2001, In: Ieee Transactions On Dielectrics And Electrical Insulation. 8, 5, p. 838-844 7 p.

  Research output: Contribution to journal › Article › peer-review

  • Fractal dimension 100%
  • Fractals 86%
  • Microscopes 48%
  • Water 45%
  • Cables 26%
  24 Citations (Scopus)
• 2000

  Pore dimension of water trees in PE: NMR studies

  Judeinstein, P., Lança, M. D. C., Marat-Mendes, J. & Rault, J., Oct 2000, In: Polymer. 41, 22, p. 8151-8154 4 p.

  Research output: Contribution to journal › Article › peer-review

  • Nuclear magnetic resonance 100%
  • Dimension 62%
  • Pore 54%
  • Water 45%
  • Electric Field 37%
  6 Citations (Scopus)
• 1999

  Processing and characterization of sol-gel derived modified PbTiO₃ for ferroelectric composites

  Igreja, R., Dias, C. & Marat-Mendes, J., 1999, In: Ferroelectrics. 228, 1, p. 99-109 11 p.

  Research output: Contribution to journal › Article › peer-review

  • Lead titanate 100%
  • Ferroelectric materials 76%
  • Sol-gels 75%
  • Powders 46%
  • gels 45%
  4 Citations (Scopus)

• Role of crystallisation process of ferroelectric ceramic gels on the electroactive properties of sol-gel ceramic/polymer composites

  Igreja, R., Dias, C. J. & Marat-Mendes, J. N., 1999, Proceedings - International Symposium on Electrets. Institute of Electrical and Electronics Engineers (IEEE), p. 631-634 4 p.

  Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Ferroelectric ceramics 100%
  • Sol-gels 76%
  • Crystallization 63%
  • Gels 61%
  • Powders 47%
  6 Citations (Scopus)
• 1998

  On the nature of thermally stimulated discharge current spectra in polyethylene terephthalate

  Gorokhovatsky, Y., Temnov, D., Marat-Mendes, J. N., Dias, C. J. M. & Das-Gupta, D. K., 15 May 1998, In: Journal of Applied Physics. 83, 10, p. 5337-5341 5 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • polyethylene terephthalate 100%
  • depolarization 44%
  • space charge 38%
  • electrodes 13%
  • geometry 12%
  16 Citations (Scopus)
• 1997

  Analysis of the thermally stimulated discharge current around glass-rubber transition temperature in polyethylene terephthalate

  Neagu, E. R., Marat-Mendes, J. N., Das-Gupta, D. K., Neagu, R. M. & Igreja, R., 1 Sept 1997, In: Journal of Applied Physics. 82, 5, p. 2488-2496 9 p.

  Research output: Contribution to journal › Article › peer-review

  • polyethylene terephthalate 100%
  • rubber 88%
  • transition temperature 70%
  • glass 51%
  • cleaning 25%
  60 Citations (Scopus)

• Polarization and hysteresis in low resistivity ferroelectric composites

  Dias, C. J., Inacio, P., Marat-Mendes, J. N. & Das-Gupta, D. K., 1997, In: Ferroelectrics. 198, 1-4, p. 121-130 10 p.

  Research output: Contribution to journal › Article › peer-review

  • Ferroelectric materials 100%
  • Hysteresis 74%
  • Polarization 69%
  • hysteresis 58%
  • Voltage 54%
  3 Citations (Scopus)

• Processing and Characterization of Sol-Gel Derived Modified PbTiO₃ for Ferroelectric Composite Applications

  Igreja, R., Dias, C. J. & Marat-Mendes, J. N., 1997, In: Journal Of Sol-Gel Science And Technology. 8, 1-3, p. 721-723 3 p.

  Research output: Contribution to journal › Article › peer-review

  • Lead titanate 100%
  • Pyroelectricity 80%
  • Ferroelectric materials 76%
  • Sol-gels 75%
  • Powders 46%
  10 Citations (Scopus)
• 1995

  Study of poling behavior of biaxially stretched poly(vinylidene fluoride) films using the constant-current corona triode

  Giacometti, J. A., Ribeiro, P. A., Raposo, M., Marat-Mendes, J. N., Carvalho Campos, J. S. & Dereggi, A. S., 1995, In: Journal of Applied Physics. 78, 9, p. 5597-5603 7 p.

  Research output: Contribution to journal › Article › peer-review

  • triodes 100%
  • vinylidene 87%
  • coronas 77%
  • fluorides 76%
  • charging 72%
  35 Citations (Scopus)
• 1992

  Constant-Current Corona Charging Of Biaxially Stretched Pvdf Films In Humidity-Controlled Atmospheres

  Ribeiro, P. A. M. F., Raposo, M., Marat-mendes, J. N. & Giacometti, J. A., Aug 1992, In: Ieee transactions on electrical insulation. 27, 4, p. 744-750 7 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

  • Protective atmospheres 100%
  • Surface potential 93%
  • Atmospheric humidity 61%
  • Triodes 33%
  • Ferroelectric materials 30%
  22 Citations (Scopus)

• Corona Polarization Effects on Polymers Surfaces

  Marat-mendes, J. N., Ribeiro, P. A. M. F. & Raposo, M. D. F. G. D. S. C., 1992, Equilibrium Structure and Properties of Surfaces and Interfaces. Gonis, A. & Stocks, G. M. (eds.). New York: Plenum, p. 353-359 7 p. (NATO Advanced Science Institutes series; vol. 300).

  Research output: Chapter in Book/Report/Conference proceeding › Chapter