RT info:eu-repo/semantics/article
T1 Optical properties of polyisocyanurate–polyurethane aerogels: Study of the scattering mechanisms
A1 Merillas Valero, Beatriz
A1 Martín de León, Judit
A1 Villafañe González, Fernando
A1 Rodríguez Pérez, Miguel Ángel
K1 Poliuretans
K1 Espumas poliméricas de poliuretano - Propiedades mecánicas
K1 Polimers
K1 Aerogel
K1 Materials - Optical properties
K1 Materiales - Propiedades ópticas
K1 Rayleigh scattering
K1 Mie scattering
K1 Dispersion
K1 Materials science
K1 Chemical engineering
K1 2304.21 Poliuretanos
K1 2206.10 Polímeros
K1 3312 Tecnología de Materiales
K1 3303 Ingeniería y Tecnología Químicas
AB 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.
PB MDPI
SN 2079-4991
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/62666
UL https://uvadoc.uva.es/handle/10324/62666
LA eng
NO Nanomaterials, 2022, Vol. 12, Nº. 9, 1522
NO Producción Científica
DS UVaDOC
RD 19-may-2024