ME - Comunicações em actas de encontros científicos internacionais
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- Dielectric UV filters for protection of fire-resistant glass based on intumescent layersPublication . Silva, Ricardo Magno Lopes; Hashim, Hurraira; Roy, Deepto; Oliveira Fernandes, Carolina; Oliveira, Kevin; Leitão Pinheiro, Xavier Alexandre; Esteves, M. Alexandra; Capelo, Anabela; Donato, Mariana; Oliveira, Fernando; Ferreira, Cristina; Alves, Isabel N.; Cunha Diamantino, Teresa; Barreiros, Maria Alexandra; Rocha, Jorge; Passos Teixeira, Jennifer; Salomé, PedroABSTRACT: Structures such as OLEDs, perovskite solar cells, intumescent glasses, and other components in modern devices and buildings contain materials suscep-tible to degradation when exposed to UV radiation, requiring protection to with-stand outdoor environmental conditions. In this work, multilayer coating config-ured as a Bragg Reflector on glass is employed as spectral filtering to protect the intumescent component of fire-resistant glass from degradation due to prolonged UV solar radiation exposure. By alternating low-n (SiO2)/high-n (TiO2) dielectric layers through spin-coating, precise control over film thickness could be achieved, allowing the fabrication of thin (<700 nm) UV filters with high trans-mission of visible sunlight – 88% of the 780 to 380 nm wavelength range – while reflecting almost all the incident UV – 90% of the wavelength below 380nm. Using relatively simple techniques, high precision coating was successfully achieved, resulting in an effective UV radiation protective barrier applied to en-hance the durability of the components in fire-resistant glass.
- Protection of Steel Structures against Fire and Corrosion by Paint Coatings: A comparative studyPublication . Ferreira, Cristina; Gonçalves, Rita; Alves, Isabel N.; Vieira, Ana; Donato, Mariana; Morgado, Vanessa; Silva, Helena; Cristino, Ana Filipa Russo de Albuquerque; Nunes Soares, Tiago Diogo; Barreiros, Maria Alexandra; Cunha Diamantino, TeresaABSTRACT: Steel structural systems in modular construction must be protected against corrosion and fire exposure. The durability of both protective properties plays a key role in ensuring long-term service life and minimizing maintenance costs. The present work aims to validate anticorrosive protection systems for steel structures, with and without fire protection properties, evaluating degradation mechanisms and assessing the compatibility of intumescent layers with anticor-rosive coatings, in terms of their impact on corrosion resistance and fire protec-tion properties.
- Li-ion Battery Recycling: A Summary ReviewPublication . Nogueira, Carlos; Neiva Correia, Maria Joana; Margarido, Fernanda; Plancha, Maria João; Pedrosa, Fátima; Gonçalves, Ana; Silva, Clara; Silva, SaraABSTRACT: A short review of battery recycling technologies is presented. Main components and materials of battery cells, modules and packs are identified, highlighting their compositions and contents. Main component of packs is aluminium, followed by the cathode materials, anode materials, copper and polymers. Safe discharge of the spent batteries is mandatory, and the subsequent dismantling allows separation and valorisation of the aluminium casings, electronic components, polymers and steel. The resulting cells or modules are pretreated by shearing and drying, and the solvent and evolving gases shall be safely treated and disposed. Physical separation operations, including secondary shredding, sieving, gravity separation, among others, are applied to separate the Al, Cu and polymer fragments from the electrode powders (black mass). Metallurgical processing, by hydro or pyrometallurgy, allows further recovery of the metals in pure forms, which are then sent back to the market. Nowadays, several hydrometallurgical processes are being introduced, allowing high recovery yields of the most important metals such as lithium, cobalt, nickel and manganese. By this way, a more sustainable management of the resources can be achieved.
- Functional alginate aerogels as green catalytic platform for CO₂-to-syngas conversion [Resumo]Publication . Messias, Sofia; Paninho, A. B.; Vieira, G.; Souza, A.; Rangel, Carmen M.; Nunes, Daniela; Martins, Rodrigo; Mendes, Manuel Joao; Machado, Ana
- The H2Excellence Project-Fuel Cells and Green Hydrogen Centers of Vocational Excellence Towards Achieving Affordable, Secure, and Sustainable Energy for EuropePublication . Gano, António; Ribeiro Pinto, Paulo Jorge; Esteves, M. Alexandra; Rangel, Carmen M.ABSTRACT: The demand for green hydrogen (H2) and related technologies is expected to increase in the coming years, driven by climate changes and energy security of supply issues, amid the European and global energy crises. The European Green Deal and REpowerEU Plan have identified H2 as a key pillar for reaching climate neutrality by 2050 and for the intensification of hydrogen delivery targets, bringing the large-scale adoption of hydrogen production and applications, and stressing the need for a skilled workforce in emergent H2 markets. To that end, the H2Excellence project will establish a Platform of Vocational Excellence in the field of fuel cells and green hydrogen technologies, with an educational and training scheme to tackle identified skill gaps and to implement life-long learning opportunities. This project aims to become a European benchmark in training and knowledge transfer, incorporating the entire hydrogen value chain. The work is supported by the Knowledge Triangle Model, integrating education, research, and innovation efforts to build a dynamic ecosystem in the green hydrogen sector. In this work, activities conducted so far by LNEG as a project partner and expected impacts are highlighted. Those activities are based on a stakeholder needs assessment conducted by project partners and on the knowledge and experience accumulated in research activities developed in the Materials for Energy research area.
- Marine biomineralization for enhanced corrosion resistance: Insights from the ANR MICOATEC project [Poster]Publication . Marques, Maria João; Nkoua, C.; Jaume, Julien; Diderot, Anthony; Mercier, Dimitri; Seyeux, Antoine; Délia, Marie-Line; Silva, S. da; Fori, B.; Blanc, C.; Zanna, Sandrine; Marcus, Philippe; Basseguy, RegineABSTRACT: Concerns about marine pollution and ecological threats caused by traditional corrosion protection technologies have driven the development of new environmentally friendly anti-corrosion solutions. In recent years, it became clear that microorganisms have the potential to positively impact corrosion behavior, a phenomenon known as MICI (microbiologically influenced corrosion inhibition) [1,2]. Although research on MICI mechanisms is still in the beginning, two main mechanisms have been outlined: direct and indirect inhibition. In the first one, the microorganisms are responsible for the segregation of slow-release inhibitors or surfactants or consume oxygen, which affects the cathodic reaction process. The second one, indirect inhibition mechanism, is associated to the formation of a protective layer on the surface of the material due to metabolic activity of microorganisms. In this context, biomineralization attracted the attention of researchers as a solution to inhibit metal corrosion.
- Marine Microbial Induced Mineralization: Exploring Mechanisms for Bioinspired Anticorrosion solutionsPublication . Marques, Maria João; Zanna, Sandrine; Marcus, Philippe; Basseguy, RegineABSTRACT: In the field of corrosion, nature has proved to be a source of inspiration for developing new green protection concepts. Over the last decades, new emerging microbial-based technologies have been studied, based on the recognition that microorganisms can influence corrosion behaviour in an advantageous way, the so-called MICI (microbiologically influenced corrosion inhibition), opening different lines of research (1-5). In particular, the process of biomineralisation on the surface of materials was recently highlighted as a promising new environmentally-friendly approach to produce protective coatings.
- Potential for hydrogen production associated to water and food in off-grid communities of Southern AfricaPublication . Rodrigues, Luiz; Araujo, Luis; Gano, António; Pinto, P.J.R.; Simoes, Sofia; Brito, Paulo; Monjane, Armindo; Rangel, C. M.ABSTRACT: Solar energy is called to meet electricity demands for isolated, off-grid communities in Africa. However, solar electric energy is intermittent and can be stored, for a limited amount of time, in batteries, which are expensive and cause serious environmental impacts at the end of their lifetime. Conversion of the surplus electric energy to green hydrogen through water electrolysis and back to electricity, when needed, using electrolyser-fuel cells systems, is examined as a potential solution to meet the water-energy-food nexus in Southern Africa. In the framework of the Agrivoltaics concept, the main constrains, opportunities and parameters to consider its applicability are presented and discussed, in terms of its technical, economic, environmental and social impacts. In the second phase of this work the developing of a PEM electrolyser for connection to a solar PV power source and a fuel cell device, for a stand-alone application, is proposed, ensuring high reliability and energy conversion efficiencies, as well as adequate transient response and a competitive cost. It is intended as a low-carbon energy system, realising the potential for synergy in the Agrivoltaic concept, aligned with global and regional sustainability goals.
- A Distributed Smart Battery Management System: sBMS, for Stationary Energy Storage ApplicationsPublication . Gano, António; Rangel, C. M.ABSTRACT: Currently, electric energy storage systems for stationary applications have known an increasing interest, namely with the integration of local renewable energy power sources into energy communities. Li-ion batteries are considered the leading electric storage devices to achieve this integration, and Battery Management Systems (BMS) are decisive for their control and optimum performance. In this work, the advancement of a smart BMS (sBMS) prototype with a modular distributed topology is described. The system, still under development, has a distributed architecture, with modular characteristics, to operate with different battery pack topologies and charge capacities, integrating adaptive algorithms for functional state real time monitoring and management of multicellular Li-ion batteries, and is intended for application in the context of a local energy community fed by renewable energy sources.
- Potential for hydrogen production associated to water and food in off-grid communities of Southern Africa [Resumo]Publication . Rodrigues, Luiz; Araujo, Luis; Gano, António; Pinto, P.J.R.; Simoes, Sofia; Brito, Paulo; Monjane, Armindo; Rangel, C. M.ABSTRACT: Solar energy is called to meet electricity demands for isolated, off-grid communities in Africa. However, solar electric energy is intermittent and can be stored, for a limited amount of time, in batteries, which are expensive and cause serious environmental impacts at the end of their lifetime. Conversion of the surplus electric energy to green hydrogen through water electrolysis and back to electricity, when needed, using electrolyser-fuel cells systems, is examined as a potential solution to meet the water-energy-food nexus in Southern Africa. In the framework of the Agrivoltaics concept, the main constrains, opportunities and parameters to consider its applicability are presented and discussed, in terms of its technical, economic, environmental and social impacts. In the second phase of this work the developing of a PEM electrolyser for connection to a solar PV power source and a fuel cell device, for a stand-alone application, is proposed, ensuring high reliability and energy conversion efficiencies, as well as adequate transient response and a competitive cost. It is intended as a low-carbon energy system, realising the potential for synergy in the Agrivoltaic concept, aligned with global and regional sustainability goals.