Project/scholarship details
- Project/scholarship ID
112574
- Reference
PTDC/CTM-NAN/112574/2009
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
132,344.00 €
- Start date
2011-03-01
- End date
2014-02-28
Documents
Nucleation of the electroactive γ phase and enhancement of the optical transpar...
Lopes, A. C.; Costa, Carlos M.; Tavares, C. J.; Neves, I. C.; Lanceros-Méndez, S.Poly(vinylidene fluoride), PVDF, based nanocomposites with different clays structures have been processed by solvent casting and melt crystallisation. Depending on the melting temperature of the polymer, the nanocomposite recrystalises in the electroactive or non electroactive β-phase of the polymer. This fact is related to the thermal behaviour of the clay. For montmorillonite clay, the full crystallisation...
Tailoring porous structure of ferroelectric poly(vinylidene fluoride-trifluoroe...
California, A.; Cardoso, V. F.; Costa, Carlos M.; Sencadas, Vítor João Gomes Silva; Botelho, Gabriela; Gómez Ribelles, J. L.; Lanceros-Méndez, S.Ferroelectric macroporous poly(vinylidene fluoride-trifuoroethylene) membranes have been produced by isothermal crystallization from the solution at different temperatures starting from different diluted solutions of the co-polymer in dimethylformamide. In this way pore architecture, consisting in interconnected spherical pores can be obtained. The mechanism and kinetics of solvent evaporation was investigated ...
Role of nanoparticle surface charge on the nucleation of the electroactive β-po...
Martins, P.; Caparrós Vásquez, Cristina Maria; Gonçalves, Renato Ferreira; Martins, Pedro Manuel Abreu; Benelmekki, M.; Botelho, GabrielaThe electroactive β-phase of poly(vinylidene fluoride) (PVDF) can be nucleated by introducing CoFe2O4 nanoparticles within the polymer matrix, leading to electroactive materials with large potential for sensor and actuator applications. The effects of the CoFe2O4 nanoparticle electrostatic charge on the phase crystallization of PVDF polymer is reported. For this purpose, the CoFe2O4 nanoparticles were coated wi...
Electrical properties of AlNxOy thin films prepared by reactive magnetron sputt...
Borges, Joel Nuno Pinto; Martin, N.; Barradas, Nuno P.; Alves, E.; Eyidi, D.; Beaufort, Marie France; Riviere, J. P.; Vaz, F.; Marques, L.Direct current magnetron sputtering was used to produce AlNxOy thin films, using an aluminum target, argon and a mixture of N2+O2 (17:3) as reactive gases. The partial pressure of the reactive gas mixture was increased, maintaining the discharge current constant. Within the two identified regimes of the target (metallic and compound), four different tendencies for the deposition rate were found and a morphologi...
Modeling carbon nanotube electrical properties in CNT/polymer composites
Silva, Jaime; Simões, Ricardo; Lanceros-Méndez, S.In this work it is demonstrated that the capacitance between two cylinders increases with the rotation angle and it has a fundamental influence in the composite dielectric constant. The dielectric constant is lower for nematic materials than isotropic ones and this can be attribute to the effect of the filler alignment in the capacitance. Also in this work it is studied the effect of aspect ratio in the conduct...
Quantitative evaluation of the dispersion ability of different preparation meth...
Cardoso, Paulo; Klosterman, D.; Covas, J. A.; Hattum, F. W. J. van; Lanceros-Méndez, S.The aim of this work is to quantitatively analyze the dispersion ability of different methods for the preparation of vapor grown carbon nanofiber - epoxy composites. Four different dispersion methods were used, differing in stress level intensity: blender mixing, capillary rheometry mixing, 3 roll milling and planetary centrifuge mixing. Furthermore, the relationship between dispersion and DC conductivity of th...
Effect of filler size and concentration on the structure and properties of poly...
Mendes, Sérgio Firmino Soares; Costa, C. M.; Caparrós Vásquez, Cristina Maria; Sencadas, Vítor João Gomes Silva; Lanceros-Méndez, S.The effect of filler size and content in the thermal, mechanical and electrical response of poly(vinylidene fluoride) (PVDF)/ BaTiO3 nanocomposites has been investigated. Dielectric constant increases significantly with increasing filler content and decreasing filler size. Space charge effects at the interface between BaTiO3 and PVDF strongly influence the dielectric response. The electroactive -phase of PVDF ...
Otimização do processo de deposição de oxinitretos metálicos por pulverização r...
Borges, Joel Nuno PintoTese de doutoramento em Ciências (área de especialização em Física); O sistema ternário de oxinitreto de alumínio (AlNxOy) oferece a possibilidade de obter um gradiente de respostas, combinando as propriedades do Al, AlN e do Al2O3 no A evolução da taxa de deposição dos filmes foi também correlacionada com o aumento da pressão parcial de gás reativo e com as características da deposição, encontrando-se quatro t...
Mechanical, electrical and electro-mechanical properties of thermoplastic elast...
Costa, Pedro Filipe Ribeiro; Silva, Jaime; Sencadas, Vítor João Gomes Silva; Simões, Ricardo; Viana, J. C.; Lanceros-Méndez, S.Composites of styrene-butadiene-styrene (SBS) block copolymer with multiwall carbon nanotubes (MWCNT) were processed by solution casting in order to investigate the influence of filler content, the different ratio of styrene/butadiene in the copolymer and the architecture of the SBS matrix on the electrical, mechanical and electro-mechanical properties of the composites. It was found that filler content and ela...
Influence of stoichiometry and structure on the optical properties of AlNxOy films
Borges, Joel Nuno Pinto; Barradas, N. P.; Alves, Eduardo; Beaufort, Marie France; Eyidi, Dominique; Vaz, F.; Marques, L.The AlNxOy system offers the possibility to obtain a wide range of responses, by tailoring the properties between Al, AlN and Al2O3, opening a significant number of possible applications. The aim of this work is to correlate the optical properties of AlNxOy thin films with their composition and structural features, taking as reference the binary systems AlNx and AlOy. In the AlNx system, the increase of the nit...
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