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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/73915

    Título
    Studying the size-dependence of graphene nanoplatelets (GNPs) in the final properties of polyurethane aerogels: thermal insulation and mechanical strength
    Autor
    Lledó Martín, JaimeAutoridad UVA Orcid
    Martín de León, JuditAutoridad UVA
    Gómez Álvarez-Arenas, Tomás Enrique
    Rodríguez Pérez, Miguel ÁngelAutoridad UVA Orcid
    Merillas Valero, BeatrizAutoridad UVA
    Año del Documento
    2025
    Editorial
    MDPI
    Descripción
    Producción Científica
    Documento Fuente
    Gels, 2025, vol. 11, n. 1, 44
    Abstract
    In the present work, the influence of the addition of graphene nanoplatelets presenting different dimensions on polyurethane–polyisocyanurate aerogel structure and properties has been studied. The obtained aerogels synthesized through a sol–gel method have been fully characterized in terms of density, porosity, specific surface area, mechanical stiffness, thermal conductivity, and speed of sound. Opacified aerogels showing high porosity (>92%) and low densities (78–98 kg/m3) have been produced, and the effect of the size and content of graphene nanoplatelets has been studied. It has been observed that formulations with less than 5 wt.% of graphene nanoplatelets larger than 2 microns can effectively reduce the total thermal conductivity by absorption and scattering of the infrared radiation, reducing the heat transfer by this mechanism. The resulting opacified samples are highly insulating materials, with thermal conductivities less than 18 mW/m·K. Moreover, it has been observed that smaller particles with ca. 200 nm of average length can promote an increase in the elastic modulus, therefore obtaining stiffer aerogels, combined with thermal conductivities lower than 20 mW/m·K. Results have been studied in detail, providing a further understanding of the mechanisms for improving the final properties of these materials, making them more suitable for industrial applications.
    Palabras Clave
    polyurethane/graphene nanoplatelet aerogel
    thermal insulation
    opacifiers
    scattering
    infrared radiation
    ISSN
    2310-2861
    Revisión por pares
    SI
    DOI
    10.3390/gels11010044
    Patrocinador
    Ministerio de Ciencia e Innovación (RTI2018-098749-B-I00, PID2021-127108OB-I00, TED2021-130965B-I00, PDC2022-133391-I00)
    Junta de Castilla y León/FEDER (VA202P20)
    Junta de Castilla y León y Unión Europea-NextGenerationEU (C17. I1)
    Version del Editor
    https://www.mdpi.com/2310-2861/11/1/44
    Propietario de los Derechos
    © 2025 by the authors
    Idioma
    eng
    URI
    https://uvadoc.uva.es/handle/10324/73915
    Tipo de versión
    info:eu-repo/semantics/publishedVersion
    Derechos
    openAccess
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    • DEP32 - Artículos de revista [284]
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