biostudies-literatureMerillas BMinisterio de Ciencia, Innovación y UniversidadesJunta de Castilla y LeónEnte Público Regional de la Energía de Castilla y León1522https://www.ebi.ac.uk/biostudies/studies/S-EPMC9100237biostudies-literatureUnknown12(9)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 Nanomaterials (Basel, Switzerland)Optical Properties of Polyisocyanurate-Polyurethane Aerogels: Study of the Scattering Mechanisms.PMC9100237RTI2018-098749-B-I00FPU17/03299EREN_2019_L4_UVAVA202P20Villafane FMartin-de Leon JMerillas BRodriguez-Perez MAfalseOptical Properties of Polyisocyanurate-Polyurethane Aerogels: Study of the Scattering Mechanisms.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 2022-01-01T00:00:00Z2022 Apr2025-04-04T20:35:26.813Z2025-04-04T20:35:26.813ZS-EPMC91002373556423110.3390/nano12091522