RT info:eu-repo/semantics/article
T1 Reaching a near zero radiative heat transfer by the inclusion of modified multiwalled-carbon nanotubes (MWCNTs) in polyurethane-polyisocyanurate aerogels
A1 Merillas Valero, Beatriz
A1 Gómez Álvarez Arenas, Tomás Enrique
A1 Villafañe González, Fernando
A1 Rodríguez Pérez, Miguel Ángel
K1 Thermodynamics
K1 Aislamiento térmico
K1 Carbon nanotubes
K1 Radiative contribution
K1 Polyurethane aerogels
K1 Nanotubos de carbono
K1 Contribución radiativa
K1 Aerogeles de poliuretano
K1 3312 Tecnología de Materiales
AB This article studies the effect of adding different contents of surface-modified multiwalled carbon nanotubes (CNTs) on the structure and final properties of polyisocyanurate-polyurethane aerogels. The produced samples were characterized in terms of density, porosity, shrinkage, textural properties, mechanical behavior, ultrasonic behavior, and thermal conductivity. Low-weight aerogels were obtained with densities between 89 and 95 kg/m3. The inclusion of homogeneously dispersed carbon nanotubes protected the aerogel structure during supercritical drying decreasing the final shrinkage of these samples and, therefore, increasing their porosity. The porous structure of the aerogels containing CNTs was modified, and slightly larger pores were formed. The structural modifications contribute to decrease the stiffness of the samples while improving their resilience and elasticity. Finally, a significant enhancement on the insulating performance of the aerogels has been found when CNTs were added reaching values as low as 12 mW/mK. These fillers were proved to act as infrared opacifiers by absorbing and scattering the infrared radiation, a relevant contribution in these lightweight materials. In fact, the radiation contribution was strongly reduced when the content of CNTs reached 3 wt%, being this contribution near zero. Thus, this content was considered as the optimum for the final properties-balance in these aerogels.
PB Elsevier
SN 2468-5194
YR 2023
FD 2023
LK https://uvadoc.uva.es/handle/10324/62998
UL https://uvadoc.uva.es/handle/10324/62998
LA eng
NO Materials Today Chemistry, 2023, vol.34, 101789
NO Producción Científica
DS UVaDOC
RD 21-may-2024