28 documents found, page 1 of 3
Evaluation of tensile properties in in-plane auxetic carbon/epoxy and carbon-gl...
Veloso, Cristiano; Mota, Carlos; Cunha, Fernando; Sousa, Jose; Dias, Gustavo; Uribe, Braian Esneider Buitrago; Fangueiro, RaúlAuxetic laminates, i.e. with a negative Poisson’s ratio (NPR), show great engineering promise, with enhancements in shear resistance, fracture toughness, energy absorption, and delamination and damage extension limitation. This study focuses on the tensile properties of in-plane (IP) NPR fibre-reinforced polymer (FRP) laminates, namely carbon/epoxy (C/E) and carbon-glass/epoxy (C-G/E) laminates, with lay-up seq...
Functionalization of 3D-printed gyroid structures with active agents for enhanc...
Pinto, Ângela; Moreira, Maria João; Gonçalves, Afonso; Rua, Ricardo F.; Arruda, Luisa Mendes; Gomes, Fernanda; Antunes, Joana; Bessa, JoãoThe textile industry is a major consumer of water, contributing significantly to global water pollution due to the discharge of untreated wastewater containing dyes and chemicals. Consequently, water contamination in this sector is a pressing issue that demands immediate attention. Hence, the present studies alternative filtration solutions using strategically designed gyroid structures for Plate and Frame filt...
Durable and breathable ZnO/graphene-coated fabrics for enhanced BQR protection
Ferreira, Tânia; Vale, A. Catarina; Gonçalves, Afonso; Pinto, Alexandra C.; Sousa, Diana; Guimarães, Humberto; Moreira, Inês P.; Silva, CarlosThis work developed a new strategy to create active protection against chemical, biological, radiological and nuclear (CBRN) threats, based on polyurethane-based coatings for outer (water and oil-repellency) and inner (CBRN protection) functionalization of fabric. The internal coatings were functionalized with varying concentrations of zinc oxide nanoparticles (ZnO) and/or graphene nanoplatelets (Gf) and carefu...
Holistic framework to data-driven sustainability assessment
Peças, Paulo; John, Lenin; Ribeiro, Inês; Baptista, António J.; Pinto, Sara M.; Dias, Rui; Henriques, Juan; Estrela, Marco; Pilastri, AndréIn recent years, the Twin-Transition reference model has gained notoriety as one of the key options for decarbonizing the economy while adopting more sustainable models leveraged by the Industry 4.0 paradigm. In this regard, one of the most relevant challenges is the integration of data-driven approaches with sustainability assessment approaches, since overcoming this challenge will foster more agile sustainabl...
Halochromic textiles for real-time sensing of hazardous chemicals and personal ...
Leite, Liliana; Pais, Vânia Nascimento; Silva, Cristina; Boticas, Inês Martins; Bessa, João; Cunha, Fernando; Relvas, Cátia; Ferreira, NoelChemical protective clothing (CPC) has become mandatory when performing various tasks to ensure user protection and prevent chemicals from contacting the skin and causing severe injuries. In addition to protection, there is a need to develop a simple mechanism that can be attached to CPC and be capable of detecting and alerting the user to the presence of harmful chemical agents. In this study, a double-sensor ...
Comparison of zinc oxide nanoparticle integration into non-woven fabrics using ...
Ferreira, Tânia; Vale, Ana Catarina; Pinto, Alexandra C.; Costa, Rita V.; Pais, Vânia; Sousa, Diana; Gomes, Fernanda Isabel Antunes; Pinto, GraçaThe development of advanced facemasks stands out as a paramount priority in enhancing healthcare preparedness. In this work, different polypropylene non-woven fabrics (NWF) were characterised regarding their structural, physicochemical and comfort-related properties. The selected NWF for the intermediate layer was functionalised with zinc oxide nanoparticles (ZnO NPs) 0.3 and 1.2wt% using three different method...
Prussian blue sensor for bacteria detection in personal protection clothing
Leite, Liliana; Pais, Vânia Nascimento; Bessa, João; Cunha, Fernando; Relvas, Cátia; Ferreira, Noel; Fangueiro, RaúlBiological hazards can be defined as substances that endanger the life of any living organism, most notably humans, and are often referred to as biohazards. Along with the use of personal protective equipment (PPE), early detection of contact is essential for the correct management and resolution of a biological threat, as well as lower mortality rates of those exposed. Herein, Prussian blue (PB) was evaluated ...
Multifunctional coated textiles for active biological protection
Antunes, Joana C.; Ferreira, Tânia; Arruda, Luisa M.; Sousa-Silva, M.; Gomes, Fernanda Isabel; Cunha, Fernando; Moreira, Inês P.; Henriques, MarianaThe rising threats to the worldwide security (military and civilian) attest the need to develop efficient and versatile technological solutions to protect the human being [...]
Halochromic inks applied on cardboard for food spoilage monitorization
Leite, Liliana; Boticas, Inês; Navarro, Miguel; Nobre, Luís; Bessa, João; Cunha, Fernando; Neves, Pedro; Fangueiro, RaúlControl of food spoilage is a critical concern in the current world scenario, not only to ensure the quality and safety of food but also to avoid the generation of food waste. This paper evaluates a dual-sensor strategy using six different pH indicators stamped on cardboard for the detection of spoilage in three different foods: beef, salmon, and strawberries. After function validation and formulation optimizat...
Low-velocity impact response of auxetic seamless knits combined with non-newton...
Pais, Vânia; Silva, Pedro; Bessa, João; Dias, Hernâni; Duarte, Maria Helena; Cunha, Fernando; Fangueiro, RaúlLow-velocity impact can cause serious damage to the person or structure that is hit. The development of barriers that can absorb the energy of the impact and, therefore, protect the other side of the impact is the ideal solution for the pointed situation. Auxetic materials and shear thickening fluids are two types of technologies that have great capabilities to absorb high levels of energy when an impact happen...