219 documents found, page 1 of 22
Development of Co-Axial fibres composed of CA (Mn 50,000) and PEGs (600 and 100...
Costa, Manuel F. M.; Carneiro, Joaquim A. O.; Hammes, Nathalia; Monteiro, José; Rocha Segundo, Iran Gomes da; Felgueiras, Helena PradoRapid urbanisation and industrialisation have intensified the Urban Heat Is-land (UHI) effect, significantly increasing energy demand for thermal comfort. Urban buildings consume considerable energy throughout the year, which can be reduced by incorporating Phase Change Materials (PCMs) into building materials. PCMs effectively regulate temperature by storing and releasing heat as latent heat during phase trans...
Evaluation of heavy metal content in plastic bags used as improvised food cooki...
Costa, Manuel F. M.; Geraldo, Dulce; Carneiro, Joaquim A. O.; Nhanga, Manença Cristiano; Nhapulo, Sérgio Leonardo; João, Afonso FilipeThe widespread use of plastic bags as improvised food cooking covers in Mozambican communities has raised public health concerns, increasing interest in studying these plastic bags, which contain heavy metals additives used to improve their physical and chemical properties. This study aims to evaluate the levels of heavy metals commonly used in plastic bags used as improvised food cooking covers, focused on Moz...
Mitigação das Ilhas de Calor Urbanas através da Incorporação de Fibras Coaxiais...
Araújo, Vitor M. M.; Hammes, Nathalia; Lima Jr., Orlando; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Pereira, Eduardo; Camões, Aires[Excerto] Introdução: As Ilhas de Calor Urbanas (ICU) ocorrem devido à substituição de superfícies naturais por materiais, por exemplo, cimentícios e asfálticos, que apresentam elevado calor específico e tendem a reter calor por longos períodos. Uma estratégia promissora para mitigar este efeito pode ser a utilização de argamassas com microfibras contendo materiais de mudança de fase (PCMs). Esses materiais aju...
Infrared thermography of cement mortar with phase change fibres
Hammes, Nathalia; Araújo, Vitor M. M.; Lima Jr., Orlando; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Pereira, Eduardo; Camões, Aires; Marinho, ElinaUrban Heat Islands (UHIs), aggravated by intense urbanisation and heat-retaining materials from buildings and roads, affect the thermal comfort of human beings. To mitigate this issue, this study aims to study the thermal performance of cement mortars with coaxial polymeric fibres produced by wet spinning and containing polyethylene glycol (PEG 600 and 1000) (CM_PCF) as phase change material. Samples were irrad...
Comparative evaluation of photocatalytic efficiency measurement techniques thro...
Lessa, Fabíula Pereira; Lima Jr., Orlando; Margalho, Élida Melo; Zahabizadeh, Behzad; Cunha, Vítor M. C. F.; Pereira, Eduardo; Camões, AiresSelf-cleaning cementitious materials, particularly with TiO2-based photocatalytic coatings, offer significant benefits by reducing surface deterioration and maintenance requirements, even in harsh urban environments. Despite the growing interest in self-cleaning cementitious materials, an international standard test method to calculate their efficiency has not yet been established for this specific type of subs...
Designing CNF-reinforced coaxial phase change fibres for thermal regulation in ...
Hammes, Nathalia; Pinheiro, Inês; Lima Jr., Orlando; Marinho, Elina; Silva, Mauela; Felgueiras, Helena; Costa, Manuel F. M.; Rocha Segundo, Iran[Excerto] Urban Heat Islands (UHIs), intensified by the high thermal retention capacity of conventional construction materials, contribute to elevated temperatures in urban areas, compromising indoor thermal comfort and directly impacting the health and well-being of the population. As a mitigation strategy, the incorporation of coaxial fibres with phase change materials (PCFs) stands out for their ability to p...
Designing coaxial polymeric fibres with phase change materials for thermal regu...
Hammes, Nathalia; Monteiro, José; Lima Jr., Orlando; Marinho, Elina; Silva, M. Manuela P.; Felgueiras, Helena; Costa, Manuel F. M.; Rocha Segundo, Iran[Abstract] Urban expansion and the widespread use of heat-absorbing materials have intensified the Urban Heat Island (UHI) effect. As a result, rising surface temperatures pose significant challenges to energy efficiency, human well-being, and environmental quality. Incorporation of phase change materials (PCMs) into civil engineering materials (CEM) has emerged as a promising passive strategy for thermal regul...
Coaxial fibres incorporated with phase change materials for thermoregulation ap...
Hammes, Nathalia; Pinheiro, Claver Giovanni Silveira; Rocha Segundo, Iran Gomes da; Homem, Natália Cândido; Silva, Maria ManuelaNowadays, the growing concern about improving thermal comfort in different structures (textiles, buildings, and pavements, among others) has stimulated research into phase change materials (PCMs). The direct incorporation of PCMs into composite materials can cause mechanical impacts. Therefore, this study focuses on the design of phase change coaxial fibres (PCFs), using commercial cellulose acetate (CA) or rec...
Preface [of the Book of Abstracts - VI International Conference on Applications...
Costa, Manuel F. M.For the sixth time, since 2011, the Portuguese Optics and Photonics community celebrates, meeting with colleagues from all over the world, at the AOP2024 conference to be held in Aveiro, Portugal, July 16 to 19, 2024, the remarkable contribution of Optics and Photonics to the development of our societies and humankind, reviewing the state-of-the-art and foreseeing the future evolution and developments in the fi...
Tackling the urban heat islands phenomenon: development of coaxial fibers with ...
Hammes, Nathalia; Monteiro, José; Pinheiro, Claver Giovanni Silveira; Felgueiras, Helena Prado; Landi Jr, Salmon; Rocha Segundo, Iran Gomes daUrban heat islands (UHI) represent a growing challenge due to the current world’s global warming trend affecting the health and quality of life of citizens. Furthermore, UHI does add up to climate change and undermine environmental sustainability in a rather negative way. The population, in general, and in particular our students and youngsters, should be aware of this problem and of the possible solutions that...