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Preparation and characterization of polysaccharides/PVA blend nanofibrous membr...
Santos, Carla; Silva, Carla J.; Büttel, Zsófia; Guimarães, Rodrigo; Pereira, Sara B.; Tamagnini, Paula; Zille, AndreaA series of polyvinyl alcohol (PVA), PVA/chitosan (CS) and PVA/cyanobacterial extracellular polymeric substances (EPS) blended nanofibrous membranes were produced by electrospinning using a microfiltration poly(vinylidene fluoride) (PVDF) basal membrane, for potential applications in water filtration. Nanofibres were obtained from solutions of 20% (w/w) PVA with 1% (w/w) CS or EPS, using a weight ratio of 60/40...
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...
Alkali and acid polysaccharides blend nanofibrous membranes prepared by electro...
Santos, Carla; Silva, Carla J.; Büttel, Zsófia; Guimarães, Rodrigo; Tamagnini, Paula; Zille, AndreaPoster apresentado no "Smart and functional coatings conference", Torino, Italy, 2013 ; Electrospinning allows the production of polymer fibres with diameters in the sub-micron size range, through the application of an external electric field, keeping intact the bulk properties of the polymers. Electrospun membranes possess some unique structural features, such as a high surface to volume ratio and very good m...
Preparation and characterization of polysaccharides/PVA blend nanofibrous membr...
Santos, Carla; Silva, Jose; Silva, Carla J.; Zille, AndreaApresentação efetuada no Smart & Funcional Coatings–European Conference Turin, 26th September 2013 ; A polyvinyl alcohol (PVA) / cyanobacterial EPS blend nanofibrous membranes were fabricated by electrospinning using polyvinylidene fluoride (PVDF) as a basal membrane, in order to obtain thin-layer composite nanofiltration membranes. The production of the nanofibers using EPS and PVA as plasticizer in different...
Fabrication and characterization of PVA, PVA/chitosan, and PVA/cyanobacterial e...
Santos, Carla; Silva, Carla J.; Guimarães, Rodrigo; Büttel, Zsófia; Tamagnini, Paula; Zille, AndreaApresentação efetuada no "245th ACS National Meeting and Exposition", em New Orleans, Louisiana, 2013 ; A series of poly(vinyl alcohol) (PVA), PVA/chitosan (CS) and PVA/cyanobacterial exopolysaccharide (EPS) blend nanofibrous membranes were fabricated by electrospinning using a microfiltration poly(vinylidene fluoride) (PVDF) as a basal membrane, in order to obtain thin-layer composite (TFC) nanofiltration mem...
Thin-layer nanofiltration membranes using engineered biopolymers for seawater d...
Büttel, Zsófia; Guimarães, Rodrigo; Santos, Carla; Silva, Carla J.; Pereira, Sara B.; Mota, Rita; Tamagnini, Paula; Zille, AndreaNowadays water demand already exceeds supply and water scarcity is a global problem. So it is necessary to develop novel technologies to be able to use poorer quality source waters for drinking water production. Once considered as an expensive, ultimate solution for water supply, desalination is becoming affordable. The two most commonly used seawater desalination methods are Multi-stage Flash Distillation (MSF...
Usos e abusos dos recursos naturais : biorremediação e energia
Zille, AndreaApresentação oral efetuada no "AEICBAS Biomedical Congress : an innovative multidisciplinary approach to life scie", no Porto, Portugal, 2013
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...
Laccases stabilization with phosphatidylcholine liposomes
Martí, M.; Zille, Andrea; Paulo, Artur Cavaco; Parra, J. L.; Coderch, L.In recent years, there has been an upsurge of interest in enzyme treatment of textile fibres. Enzymes are globular proteins whose catalytic function is due to their three dimensional structure. For this reason, stability strategies make use of compounds that avoid dismantling or distorting protein 3D structures. This study is concerned with the use of microencapsulation techniques to optimize enzyme stabilizat...
Production and characterization of extracellular carbohydrate polymer from Cyan...
Mota, Rita; Guimarães, Rodrigo; Büttel, Zsófia; Rossi, Federico; Colica, Giovanni; Silva, Carla J.; Santos, Carla; Gales, Luís; Zille, AndreaCyanobacterial extracellular polymeric substances (EPS) are heteropolysaccharides that possess characteristics suitable for industrial applications, notably a high number of different monomers, strong anionic nature and high hydrophobicity. However, systematic studies that unveil the conditions influencing EPS synthesis and/or its characteristics are mandatory. In this work, Cyanothece sp. CCY 0110 was used as ...
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