Near-infrared (NIR) reflective materials are being developed for mitigating building cooling needs. Their use contributes to broadening the range of colours, responding to the urban aesthetic demand without compromising the building performance. Despite the increase in NIR reflective pigments investigation, there is still a knowledge gap in their applicability, impact, and durability in multilayer finishing coatings of External Thermal Insulation Composite Systems (ETICS). Hence, the main goal of this work consists of evaluating the impact of incorporating NIR reflective pigments (NRP) in the solar reflectance of the surface layer of ETICS, without affecting the colour perception, as well as their influence on the colour durability and surface temperature. As such, colour, solar reflectance, and surface temperature were monitored for 2 years in dark-coloured specimens of ETICS, with and without NRP and a primer layer. It was confirmed that the main contribution of NRP is the increase of solar reflectance and, consequently, the decrease in surface temperature, especially for high exterior temperatures (around 30 ºC). Moreover, these pigments highly increase the NIR reflectance without affecting the visible colour. In addition, they contribute to maintaining the colour characteristics. The application of primer increased the surface temperature, especially for higher exterior temperatures. However, it contributes to a lower colour difference and solar reflectance variation, which is an important achievement for durability purposes.
-Background -The solid-cystic tumor of the pancreas is rare, and had several names, including "papillary cystic tumor," "solid cystic tumor," "solid and papillary epithelial neoplasm." About 90% of cases are found in young women, measuring between seven and 20 cm in diameter, with 40% of them in the head, tail 32% and 28% in the body. Case report -Woman of 29 years was admitted for investigation of strong and persistent pain in right hypochondrium. It was performed ultrasonography and abdominal computed tomography, showing lobulated mass with the consistency of soft parts in the tail of the pancreas, peripheral capsular enhancement and hypovascular center measuring 5.5x5,5x5,0 cm. MRI better defined, with intermediate signal on T1 and T2, small scattered foci of low signal on T2 and peripheral enhancement by gadolinium, suggesting tumor Frantz. She underwent parcial pancreatectomy and total splenectomy. Macroscopic and microscopic findings suggested, and immunohistochemistry confirmed the diagnosis. Conclusion -Should be considered this tumor in the differential diagnosis of abdominal masses in young women.RESUMO -Introdução -O tumor sólido-cístico do pâncreas é raro, e teve várias denominações, entre elas "tumor cístico papilar", "tumor cístico sólido", "neoplasia epitelial sólida e papilar". Cerca de 90% dos casos são encontrados em mulheres jovens, medindo entre sete a 20 centímetros de diâmetro, estando 40% deles na cabeça, 32% na cauda e 28% no corpo. Relato do caso -Mulher de 29 anos foi admitida para investigação de fortes e persistentes dores em hipocôndrio direito. Foram realizados ultrassonografia e tomografia computadorizada de abdome, mostrando massa lobulada, com consistência de partes moles na cauda do pâncreas, realce capsular periférico e centro hipovascular medindo 5,5x5,5x5,0 cm. A ressonância magnética definiu melhor, com sinal intermediário em T1 e T2, pequenos focos esparsos de hipossinal em T2 e realce periférico pelo gadolíneo, sugerindo tumor de Frantz. Foi submetida à pancreatectomia caudal e esplenectomia total. Achados anatomopatógicos macroscópicos e microscópicos sugeriram, e o estudo imunoistoquímico confirmou o diagnóstico Conclusão -Deve-se considerar esta neoplasia no diagnóstico diferencial de massas abdominais em mulheres jovens.
The application of nanomaterials in the construction field is allowing the development of smart, green, durable and more efficient buildings. Among the most widely researched nanomaterials are nano-sized cool pigments, which are being enforced to achieve thermal and energy efficient façades, with the development of high reflectance and retroreflectance coatings. Their peculiar optical and catalytic activity turns nanomaterials into suitable candidates to be use as dark coloured high solar reflectance without affecting aesthetic characteristics, thus improving the durability of coatings. The objective of this paper is to review the state-of-the-art on the benefits of using high reflectance nano pigments as coatings in building façades and their production and synthesis processes. It is thus divided into three main topics: (i) the benefits of using nanopigments on façades, (ii) the most important nanomaterials used as cool pigments and (iii) the main methods of synthesising nanopigments. One expects that the study of near-infrared nanopigmentation synthesis processes will be able to promote and disseminate the use of nanotechnology in construction, assessing the production problems and limitation and thus helping to disseminate new products by reducing production costs and increase availability.
The increasing interest in the use of a wide range of colours in buildings, especially dark colours, may lead to the early degradation of the façades, compromising their aesthetic and thermal performance. On the other hand, the incorporation of nanopigments with high reflectance properties can contribute to reducing the absorption of solar radiation. The nanoparticles contribute to increasing the solar reflectance of coatings, decreasing the surface temperature and improving the coating performance. This work evaluates the natural degradation of the colour of finishing coat with nanopigments in ETICS. The colour parameters were evaluated in different ETICS specimens, considering the colour black and red with and without incorporated nanopigments, under natural ageing. The colour measurement was performed according to ISO 1164-4, using a portable spectrophotometer. The results confirmed that the use of nanopigments improved the colour durability, promoting the maintenance of the colours parameters. The total colour difference was lower than the perceptible by the human eyes, even as the lower variation on chroma and hue parameters of the colours with nanopigments. In summary, the incorporation of nanoparticles in finishing coat of ETICS can contribute to increasing their durability and improve their thermal performance without compromising the aesthetic characteristics.
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