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Título
Optical properties of polyisocyanurate–polyurethane aerogels: Study of the scattering mechanisms
Autor
Año del Documento
2022
Editorial
MDPI
Descripción
Producción Científica
Documento Fuente
Nanomaterials, 2022, Vol. 12, Nº. 9, 1522
Abstract
Highly transparent polyisocyanurate–polyurethane (PUR–PIR) aerogels were synthesized, and their optical properties were studied in detail. After determining the density and structural parameters of the manufactured materials, we analyzed their optical transmittance. It was demonstrated that the catalyst content used to produce the aerogels can be employed to tune the internal structure and optical properties. The results show that the employment of lower catalyst amounts leads to smaller particles forming the aerogel and concomitantly to higher transmittances, which reach values of 85% (650 nm) due to aerogel particles acting as scattering centers. Thus, it was found that the lower this size, the higher the transmittance. The effect of the sample thickness on the transmittance was studied through the Beer–Lambert law. Finally, the scattering mechanisms involved in the light attenuation were systematically evaluated by measuring a wide range of light wavelengths and determining the transition between Rayleigh and Mie scattering when the particles were larger. Therefore, the optical properties of polyurethane aerogels were studied for the first time, opening a wide range of applications in building and energy sectors such as glazing windows.
Materias (normalizadas)
Poliuretans
Espumas poliméricas de poliuretano - Propiedades mecánicas
Polimers
Aerogel
Materials - Optical properties
Materiales - Propiedades ópticas
Rayleigh scattering
Mie scattering
Dispersion
Materials science
Chemical engineering
Materias Unesco
2304.21 Poliuretanos
2206.10 Polímeros
3312 Tecnología de Materiales
3303 Ingeniería y Tecnología Químicas
ISSN
2079-4991
Revisión por pares
SI
Patrocinador
Ministerio de Ciencia, Innovación y Universidades - (grant FPU17/03299)
Ministerio de Ciencia, Innovación y Universidades - (project RTI2018-098749-B-I00)
Junta de Castilla y León y Ente Público Regional de la Energía de Castilla y León (EREN) - (Grant VA202P20)
Ministerio de Ciencia, Innovación y Universidades - (project RTI2018-098749-B-I00)
Junta de Castilla y León y Ente Público Regional de la Energía de Castilla y León (EREN) - (Grant VA202P20)
Version del Editor
Propietario de los Derechos
© 2022 The Authors
Idioma
eng
Tipo de versión
info:eu-repo/semantics/publishedVersion
Derechos
openAccess
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