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Platinum nanoparticles as pH sensor for intelligent packaging
Coutinho, Paulo J. G.; Benelmekki, M.; Teixeira, Vasco M. P.; Martins, Ana JoãoPt nanoparticles were produced by reverse micelle templating using DTAB. The resulting nanoparticles showes sizes between 250nm and 500nm and formed clusters. Thioglycolic acid (TGA) was covalently attached to the nanoparticle surface as a stabilizer and as. The Pt nanoparticles were dispersed in water and the dependence of its absorvance on the pH of the solution was studied. The spectra showed surface plamon ...
Nucleation of the electroactive phase of poly(vinylidene fluoride) by ferrite n...
Martins, P.; Costa, Carlos M.; Benelmekki, M.; Lanceros-Méndez, S.Multiferroics and magnetoelectric materials show interesting scientific challenges and technnologial applications in sensors, acuators and data storage. In view of the fact that only a small number of materials show this kind of properties, exhaustive research activity is being pursued towards the development of new composite materials. Multiferroic nanocomposites films composed of piezoelectric poly(vinylidene...
Horizontal low gradient magnetophoresis behaviour of iron oxide nanoclusters at...
Benelmekki, M.; Caparrós Vásquez, Cristina Maria; Montràs, A.; Gonçalves, Renato Ferreira; Lanceros-Méndez, S.; Martínez, Ll.In this work the use of Horizontal Low Gradient Magnetic Field (HLGMF) (<100T/m) for filtration, control and separation of synthesized magnetic nanoparticles (NPs) is investigated. The characteristics of the suspension, size and type of the NPs are considered and discussed. For these purposes, Fe2O3 silica coated nanoclusters of about 150 nm are synthesized by co-precipitation, monodispersion and silica coatin...
Influence of ferrite nanoparticle type and content on the crystallization kinet...
Sencadas, V.; 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 ...
Study on oxidation layer of size controlled Nickel nanoparticles
Coutinho, Paulo J. G.; Xuriguera, E.; Benelmekki, M.; Segarra, M.; Martínez, Ll.Documento submetido para revisão pelos pares. A publicar em Nanoscale Research Letters. ISSN 1556-276X ; Research on morphology and structure of oxidation layer of Ni nanoparticles (NPs) is reported. Ni NPs were obtained by wet chemical solution method and their size controlled in the nickel nucleation step using a non-ionic surfactant. Particles were about 50nm in size and polycrystalline. Combining high-angl...
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