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Piezoelectric co-axial filaments produced by co-extrusion of poly(vinylidene fl...
Martins, R. S.; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.Documento submetido para revisão pelos pares. A publicar em "Journal of applied polymer science". ISSN 1097-4628. Article first published online: 3 APR 2014 : http://onlinelibrary.wiley.com/doi/10.1002/app.40710/abstract. DOI 10.1002/app.40710. ; The development of new thermoplastic polymer-based piezoelectric sensors with filament geometry is described. These filaments are appropriate for integration into tex...
Three layer polymer piezoelectric filaments produced by extrusion
Martins, R. S.; Gonçalves, Renato Ferreira; Azevedo, Tiago; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.; Rocha, J. G.Poly(vinylidene fluoride) (PVDF) is extensively studied due to its piezo-, pyro- and ferroelectric properties. These properties enable the use of this polymer in a number of applications either as sensor or actuator. PVDF is a semi-crystalline polymer and can crystallize in four different crystalline phases, called α, β, γ and δ. The β-phase presents the most interesting electroactive activity. These properties...
Properties and processing by extrusion of electrically conductive multilayer fi...
Martins, R. S.; Gonçalves, Renato Ferreira; Azevedo, Tiago; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.; Rocha, J. G.This work describes the production and characterization of three-layer piezoelectric filaments using two different electrically conductive polymers. The filaments were produced in a filament extrusion line, equipped with a coextrusion die that enabled a coaxial arrangement for a three-layer filament. For the inner and outer layers two different electrically conductive compounds were used, and the middle layer w...
Processing and electrical response of fully polymer piezoelectric filaments for...
Martins, R. S.; Silva, Marco Aurélio Pinto; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Souto, A. PedroThis paper describes the production and characterization of novel geometries piezoelectric products with a large potential in the design and implementation of flexible sensors produced at low cost and high rates. In particular, filament shaped geometry, appropriate for integration into textiles, is developed and described.
Production of polymer filament-shaped piezoelectric sensors for e-textiles appl...
Carvalho, Helder; Martins, R. S.; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Lanceros-Méndez, S.This work aims at the development of piezoelectric materials for flexible sensors produced with various geometries, at low cost and high production rates, adequate for the industrial scale. In particular the filament form, appropriate for integration into textiles, is described, but other geometries, such as tape, are also being studied. The filaments are produced by co-extrusion of multiple layers with piezoel...
Piezoelectric filaments produced by coextrusion
Martins, R. S.; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.Considering the significant interest of both the academic and industrial communities in the fields of i/e-textiles (interactive/electronic textiles), the number of developed applications is far below the expected. This fact is mainly related to the difficulties on the development of production methodologies adequate to industrial scale processes. In this areas the integration of piezoelectric materials, that po...
Coextrusion of polymeric piezoelectric filaments
Martins, R. S.; Nóbrega, J. M.; Gonçalves, Renato Ferreira; Silva, Marco Aurélio Pinto; Lanceros-Méndez, S.; Rocha, J. G.; Carvalho, HelderThe difficulties related to the development of industrial scalable production methodologies have limited the number of applications currently available in the field of interactive/electronic textiles, which are far below the anticipated a few years ago. In these areas the integration of piezoelectric materials, that possess sensing/actuating capabilities, such as poly(vinylidene fluoride), PVDF, and can be proc...
Co-axial piezoelectric sensors for e-textiles applications
Martins, R. S.; Gonçalves, Renato Ferreira; Rocha, J. G.; Nóbrega, J. M.; Carvalho, Helder; Lanceros-Méndez, S.This work reports on the development of piezoelectric filaments for flexible sensors produced at high production rates, adequate for the industrial scale.
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...
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