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Thermal performance and durability evaluation of Arundo donax towards an improv...
Malheiro, Raphaele Lira Meireles Castro; Morillas, Aurora; Ansolin, Adriana; Fernandes, Jorge Emanuel Pereira; Camões, Aires; Amorim, M. T. Pessoa deBio-based and natural building materials can support the building sector to reduce its environmental impact. In this study, experimental research was developed to evaluate the performance of giant reed when used as a building thermal insulation. Reed was chosen due to its high availability and close relationship to Portuguese vernacular architecture. The role of the reed’s origin in this context, its physical c...
A comparative thermoacoustic insulation study of silica aerogels reinforced wit...
Linhares, Teresa Conceição Amaral; Carneiro, Vítor Hugo Pimenta; Amorim, M. T. Pessoa de; Durães, LuisaSilica aerogels are highly porous materials with exceptional thermal insulation performance. They become even more attractive if combined thermal and acoustic insulation is achieved. Silica aerogel composites reinforced with fibres are an ingenious way to surpass the fragility stemmed from the aerogel’s intrinsic porosity, and textile fibres are good sound absorption materials. Reclaimed fibres are a relatively...
Aplicação de membranas funcionalizadas na remoção de antibióticos
Duarte, A. A. L. S.; Ferreira, Sofia Marlene Nogueira; Amorim, M. T. Pessoa deA crescente disseminação de produtos farmacêuticos no ambiente resultante das descargas de efluentes domésticos e hospitalares (ou da indústria farmacêutica) tem agravado a poluição dos ecossistemas aquáticos constituindo um complexo e desafiador problema de saúde pública. Os antibióticos são um dos grupos de fármacos mais usados no tratamento humano e veterinário, verificando-se que o controlo da presença dest...
Antibacterial and hemostatic capacities of cellulose nanocrystalline-reinforced...
Teixeira, Marta Albertina; Antunes, Joana Isabel Costa; Seabra, Catarina Leal; Fertuzinhos, Aureliano Costa; Tohidi, Shafagh Dinparast; Reis, SaletteInfection is a major issue in chronic wound care. Different dressings have been developed to prevent microbial propagation, but an effective, all-in-one (cytocompatible, antimicrobial and promoter of healing) solution is still to be uncovered. In this research, polyvinyl alcohol (PVA) nanofibrous mats reinforced with cellulose nanocrystal (CNC), at 10 and 20% v/v ratios, were produced by electrospinning, crossl...
Tiger 17 and pexiganan as antimicrobial and hemostatic boosters of cellulose ac...
Teixeira, Marta Albertina; Antunes, Joana Isabel Costa; Seabra, Catarina Leal; Tohidi, Shafagh Dinparast; Reis, Salette; Amorim, M. T. Pessoa deIn this research, we propose to engineer a nanostructured mat that can simultaneously kill bacteria and promote an environment conducive to healing for prospective wound care. Polyvinyl alcohol (PVA) and cellulose acetate (CA) were combined at different polymer ratios (100/0, 90/10, 80/20% v/v), electrospun and crosslinked with glutaraldehyde vapor. Crosslinked fibers increased in diameter (from 194 to 278 nm),...
Graphene oxide-based platforms for wound dressings and drug delivery systems: A...
Homem, Natália Cândido; Miranda, Catarina S.; Teixeira, Marta A.; Teixeira, Marta Sofia Aguiar Carvalho Oliveira; Domingues, Joana Margarida DiasIn the past few years, the outstanding properties of the best-known derivative of graphene, the graphene oxide (GO), have led to a wide increase of its spectra of application. GO-based composites have been reported as chemically and mechanically stable, presenting good biocompatibility and great antimicrobial potential. Also, GO's two-dimensional planar structure coupled with its large availability of oxygen-re...
Bactericidal wet-spun cellulose acetate/polycaprolactone fibers: impact of cinn...
Felgueiras, Helena Prado; Homem, Natália Cândido; Ana R. M. Ribeiro; Ferreira, Marta Albertina Fernandes; Antunes, Joana Isabel Costa[Excerpt] Essential oils (EOs), which are complex biomolecules composed of volatile compounds, have emerged as a new strategy to deal with bacterial infections and as a valid alternative to synthetic drugs in the treatment of chronic wounds (CW) by promoting the regeneration of damaged tissues.
Functionalization of crosslinked sodium alginate/gelatin wet-spun porous fibers...
Homem, Natália Cândido; Tavares, Tânia Daniela Eugénio; Miranda, Catarina S.; Antunes, Joana Isabel Costa; Amorim, M. T. Pessoa deNisin Z, an amphipathic peptide, with a significant antibacterial activity against Gram-positive bacteria and low toxicity in humans, has been studied for food preservation applications. Thus far, very little research has been done to explore its potential in biomedicine. Here, we report the modification of sodium alginate (SA) and gelatin (GN) blended microfibers, produced via the wet-spinning technique, with ...
Biodegradable wet-spun fibers modified with antimicrobial agents for potential ...
Felgueiras, Helena Prado; Homem, Natália Cândido; Teixeira, M. A.; Ribeiro, A. R. M.; Teixeira, Marta O.; Antunes, Joana Isabel CostaWet-spinning is a non-solvent induced phase inversion technique that allows the production of continuous polymeric microfibers, with a uniform morphology, based on the principle of precipitation. It allows the production of 3D fibrous constructs with an intricated architecture that facilitates cell infiltration, something that is very limited in electrospun nanofibrous mats, thus increasing its interest in biom...
Sodium alginate/gelatin wet-spun fibers as a delivery platform for Nisin Z cont...
Homem, Natália Cândido; Tavares, Tânia Daniela Eugénio; Miranda, Catarina S.; Barcellos, Lígia; Antunes, Joana Isabel Costa; Amorim, M. T. Pessoa de[Excerpt] The aim of this study was to produce SA/GN microfibers via wet-spinning technique, and subsequently functionalize these fibers with Nisin Z, in order to map Nisin Z’s controlled release kinetics and antimicrobial action against S. aureus