Project/scholarship details
- Project/scholarship ID
109368
- Reference
NANO/NMed-SD/0156/2007
- FundRef URI
- Funder
FCT - Fundação para a Ciência e a Tecnologia, I.P.
- Funder's country
Portugal
- Funding program
5876-PPCDTI
- Funding amount
200,853.00 €
- Start date
2009-10-01
- End date
2011-12-31
Documents
Enhancement of the dielectric constant and thermal properties of α-Poly(vinylid...
Lopes, Ana Catarina; Silva, Marco Pinto; Gonçalves, Renato; Pereira, Manuel F. R.; Botelho, Gabriela; Fonseca, A. M.; Lanceros-Méndez, S.Different commercial Y zeolites derivate from faujasite structure with similar total Si/Al ratio, NaY (Si/Al = 2.83), HY (Si/Al = 2.80), and HUSY (Si/Al = 3.00), but different framework Si/Al ratios were used to prepare α-poly(vinylidene fluoride) (α-PVDF)/zeolite nanocomposites. Structural and textural characterization of different Y zeolites was obtained by XRD, FTIR, elemental analysis and nitrogen adsorptio...
Effect of the carbon nanotube surface characteristics on the conductivity and d...
Carabineiro, S. A. C.; Pereira, M. F. R.; Pereira, J. Nunes; Caparrós Vásquez, Cristina Maria; Sencadas, Vítor João Gomes Silva; Lanceros-Méndez, S.Commercial multi-walled carbon nanotubes (CNT) were functionalized by oxidation with HNO3, in order to introduce oxygen-containing surface groups, and by thermal treatments at different temperatures for their selective removal. The obtained samples were characterized by adsorption of N2 at -196 ºC, temperature programmed desorption and determination of pH at the point of zero charge. CNT/poly(vinylidene fluorid...
Influence of ferrite nanoparticle type and content on the crystallization kinet...
Sencadas, Vítor João Gomes Silva; Martins, P.; Pitães, A.; Benelmekki, M.; Gómez Ribelles, J. L.; Lanceros-Méndez, S.This work reports on the nucleation of the β-phase of poly(vinylidene fluoride), PVDF, by incorporating CoFe2O4 and NiFe2O4 nanoparticles, leading in this way, to the preparation of magnetoelectric composites. The fraction of filler nanoparticles needed to produce the same β- to α-phase ratio in crystallized PVDF is one order of magnitude lower in the Cobalt nanoparticles. The interaction between nanoparticles ...
Linear anhysteretic direct magnetoelectric effect in Ni0.5Zn0.5Fe2O4/poly(vinyl...
Martins, P.; Moya, X.; Phillips, L. C.; Kar-Narayan, S.; Mathur, N. D.; Lanceros-Méndez, S.Free-standing flexible magnetoelectric 0-3 composite films, comprising Ni0.5Zn0.5Fe2O4 (NZFO) ferrite nanoparticles in a poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] copolymer matrix, have been prepared at low temperatures by solvent casting and melt crystallization. Ferroelectric, piezoelectric, magnetic and direct magnetoelectric properties of the nanocomposites depend strongly on ferrite concent...
Tailoring morphology and crystallinity of poly(L-lactide acid) electrospun memb...
Ribeiro, C.; Sencadas, Vítor João Gomes Silva; Costa, Carlos M.; Gómez Ribelles, J. L.; Lanceros-Méndez, S.Biodegradable poly(L-lactide acid) (PLLA) microfibers were prepared by electrospinning by varying applied potential, solution flow rate and collector conditions. Smoothly oriented and random fiber morphologies of PLLA were obtained and characterized by scanning electron microscopy. Optimum fiber orientation was obtained at 1000 rpm in a 20,3 cm diameter collecting drum, while for higher or lower drum rotation s...
Cohesive strength of nanocrystalline ZnO: Ga thin films deposited at room tempe...
Samantilleke, A. P.; Rebouta, L.; Garim, V.; Rubio-Peña, L.; Lanceros-Méndez, S.; Alpuim, P.; Carvalho, S.; Kudrin, A. V.; Danilov, Yu. A.Transparent conducting nanocrystalline ZnO:Ga (GZO) films with electromechanical and electro-optical properties were deposited by dc magnetron sputtering at room temperature on polymers (and glass for comparison). Electrical resistivity of 8.8x10-4 and 2.2x10-3 Ω.cm was obtained for films deposited on glass and polymers respectively. The crack onset strain (COS), the cohesive strength of the coatings, as well a...
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...
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...
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