8 documents found, page 1 of 1
Screen printing of cotton fabric with hydrochromic paste: evaluation of color u...
Gauche, Heloísa; Oliveira, Fernando Ribeiro; Merlini, Claudia; Hiller, Ana Paula; Souto, A. Pedro; Cabral, Isabel; Steffens, FernandaSmart textiles are promising for the future of the textile industry, providing natural fibers with attractive and interactive features. Within this context, it is possible to emphasize the chromic materials, as, for example, the hydrochromic, which alter their visual properties (color) through an external stimulus (water). The purpose of this work is to functionalize and characterize cotton knitted fabric with ...
Energy absorption from composite reinforced with high performance auxetic texti...
Steffens, Fernanda; Oliveira, Fernando Ribeiro; Fangueiro, RaúlThe objective of this study is to analyze the impact behavior on the basis of energy approach of weft knitted structures, namely a jersey composite and an auxetic composite using high performance yarns. Weft knitted fabrics were produced with the same structural and machine parameters, using 100% para-aramid and hybrid (47% para-aramid and 53% polyamide) structure. Composite fabrication was achieved through han...
Plasma treatments
Zille, Andrea; Souto, A. Pedro; Oliveira, Fernando RibeiroIn recent years, plasma technology has assumed a great importance among all available textile surface modifications processes. It is a dry, environmentally- and worker-friendly method to achieve surface alteration without modifies the bulk properties of different materials.
Size effects on antimicrobial efficiency of DBD plasma coated silver nanopartic...
Zille, Andrea; Fernandes, Margarida Maria Macedo; Francesko, Antonio; Tzanov, Tzanko Kaloyanov; Fernandes, Marta Susana MachadoThis work studies the surface characteristics, the antimicrobial activity and the aging effect, of plasma pre-treated polyamide 6,6 fabrics (PA66) coated with silver nanoparticles (AgNPs), with the aim to identify the optimum size of nanosilver exhibiting antibacterial properties suitable for manufacturing of hospital textiles. The release of bactericidal Ag+ ions from the 10, 20, 40, 60 and 100 nm AgNPs-coated...
Size and aging effects on antimicrobial efficiency of silver nanoparticles coat...
Zille, Andrea; Fernandes, Margarida Maria Macedo; Francesko, Antonio; Tzanov, Tzanko Kaloyanov; Fernandes, Marta Susana MachadoRecently, renewed interest has arisen in silver nanopar@cles for biomedical devices because of their high surface energy, enhanced physicochemical and biological proper@es and extremely large surface area, which provides beAer contact with microorganisms. Atmospheric plasma is an alterna@ve and cost- compe@@ve method to wet chemical nanopar@cles deposi@on methods, avoiding the need of toxic solvents, expensive ...
Reuse of effluent from dyeing process of polyamide fibers modified by double ba...
Oliveira, Fernando Ribeiro; Steffens, F.; Souto, A. Pedro; Zille, AndreaLow-temperature plasma technology becomes more and more attractive compared with traditional wet processes in textile preparation and finishing due to its high efficiency and low environmental impact. The objective of this study was to investigate the influence of dielectric barrier discharge plasma treatment on the trichromic dyeing process of polyamide 6.6 (PA66) and the reuse of the generated effluents for n...
Plasma treatment in textile industry
Zille, Andrea; Oliveira, Fernando Ribeiro; Souto, A. PedroPlasma technology applied to textiles is a dry, environmentally- and worker-friendly method to achieve surface alteration without modifying the bulk properties of different materials. In particular, atmospheric non-thermal plasmas are suited because most textile materials are heat sensitive polymers and applicable in a continuous processes. In the last years plasma technology has become a very active, high grow...
Estudo do processo de tingimento com ativação superficial de fibras têxteis pel...
Oliveira, Fernando RibeiroA tecnologia de descarga plasmática de dupla barreira dielétrica (DBD) é um plasma frio de baixa frequência que consiste na ionização do ar à pressão atmosférica normal, gerado por uma descarga elétrica de alta voltagem, e que quando aplicada ao processamento têxtil revelou-se uma técnica eficiente para modificar as características superficiais das fibras naturais e sintéticas, sem afetar a sua integridade e as...