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Dyeing mechanism and optimization of polyamide 6,6 functionalized with double b...
Oliveira, Fernando; Zille, Andrea; Souto, A. PedroThe physico-chemical improvements occasioned by DBD plasma discharge in dyeing process of polyamide 6,6 (PA66) fibers were investigated. The SEM, fluorescence microscopy, UV–vis spectroscopy, surface energy, FTIR, XPS and pH of aqueous extracts confirm the high polar functionalization of PA66 fibers due to plasma incorporation of oxygen atoms from atmospheric air. DBD plasma-generated reactive species preferentiall...
Processing and electrical response of fully polymer piezoelectric filaments for...
Martins, R. S.; Silva, Marco Aur??lio Pinto; Gon??alves, Renato Ferreira; Rocha, J. G.; N??brega, J. M.; Carvalho, Helder; Souto, A. PedroThis paper describes the production and characterization of novel geometries for piezoelectric products with a large potential in the design and implementation of flexible sensors produced at low cost and high rates. In particular, the filament geometry, appropriate for integration into textiles, is analyzed. Piezoelectric filaments producing electrical signals under bending or traction stress, thus acting as m...
Functionalization of cork agglomerate composite with pcm microcapsules after db...
Carmo, S. N.; Oliveira, F. R.; Silva, E. A. A.; Steffens, F.; Souto, A. PedroThis research intends to study the influence of dielectric barrier discharge (DBD) plasma treatment on the adsorption of Phase Change Materials (PCM) microcapsules applied to cork agglomerate laminated with a polymer membrane. Several experimental techniques were used to evaluate cork and membrane surface modification after plasma treatment and the influence on the microcapsules adsorption, namely, Static and D...
Development and application of a new concept of cork substrate in footwear and ...
Silva, A.; Peixoto, Joaquim; Souto, A. PedroIn the present work a “cork substrate” is developed aiming the achievement of an innovative material with ideal properties to respond to clothing and footwear applications. The preparation phases of leather processing are highly complex, with a large level of environmental aggressiveness. Garment and footwear industries are widely looking for new materials and applications able to reduce industrial pollutant ch...
Characterization of natural cork agglomerate functionalised by plasma treatment
Silva, E. A. A.; Oliveira, F. R.; Carmo, S. N.; Steffens, F.; Souto, A. PedroThis work intends to study the chemical and physical modifications of natural cork agglomerate after plasma treatment using dielectric barrier discharge (DBD). Different experimental techniques were used to evaluate the surface alterations of the substrate pre- treated with DBD plasma, namely, static and dynamic contact angle, surface energy, Fourier transform infrared spectroscopy (FTIR), energy dispersive spe...
Cortiça, tecnologia e moda : aplicação da descarga plasmática para viabilizar a...
Etienne, E. A. A.; Oliveira, F. R.; Carmo, S. N.; Steffens, F.; Souto, A. PedroEste trabalho pretende estudar potenciais aplicações da cortiça. Por ser tratar de um material inerte, muitas vezes torna-se necessário modificar a superfície deste substrato com o intuito de melhorar a sua interação com outros tipos de materiais nos processos de estamparia, tingimento, acabamentos entre outros. Diferentes técnicas foram utilizadas para analisar a cortiça após o tratamento plasmático. Verificou...
Functionalization of wool fabric with phase-change materials microcapsules afte...
Oliveira, Fernando; Fernandes, Marta; Carneiro, Noémia; Souto, A. PedroThe use of microcapsules has increased in several different areas, namely, textile applications. They have been used as a possible means of introducing new properties, namely, in medical care by antibiotics, skin moisturizers, and other drugs and for thermal comfort. In this study, we examined the influence of dielectric barrier discharge (DBD) plasma treatment on the adhesion of phase-change material (PCM) mic...
Effect of particle size on silver nanoparticle deposition onto dielectric barri...
Vu, Nguyen Khanh; Zille, Andrea; Oliveira, F. R.; Carneiro, Noémia; Souto, A. PedroThe effect on the deposition of three different size silver nanoparticles (AgNPs) onto a polyamide 6,6 (PA) fabric pre-treated using air dielectric barrier discharge (DBD) plasma was investigated. The SEM, EDS, and XPS analysis confirm that the smaller is the diameter of AgNPs, the higher the amount of adsorbed NPs on the PA. The DBD treatment on PA induces a threefold increase in Ag adsorption. The result conf...
Breathable, impermeable and odourless lining for orthopaedic footwear application
Peixoto, Joaquim; Souto, A. Pedro; Flores, PauloIs has been recognized that the breathability and impermeability of the shoes lining play a crucial role on the performance and comfort of footwear. The main goal of this work is to study the application and behaviour new materials and new finishing to improve comfort in orthopaedic footwear associated with orthosis. This desideratum is reached through the selection and application of advanced materials, such a...
Thermochromic filters effect on static light
Cabral, Isabel; Souto, A. PedroIs it possible to change the environment light without changing or act in the light source? Smart textiles materials and new technologies open the possibility to introduce dynamic behaviours to elements that use to be static. Using the ability of Colour Change Materials to answer to external stimulus, this paper studies how colour variation of textile samples, treated with reversible thermochromic pigments, fil...
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