RT info:eu-repo/semantics/doctoralThesis
T1 Synthesis, characterization and structure-properties relationship of aerogels and aerogel-based composites
A1 Merillas Valero, Beatriz
A2 Universidad de Valladolid. Escuela de Doctorado
K1 Materiales
K1 Polyurethane
K1 Poliuretano
K1 Aerogels
K1 Aerogeles
K1 22 Física
K1 33 Ciencias Tecnológicas
AB During the last few years, cellular materials research has pointed to aerogels as one of the most promising materials. This is due to the combination of properties, such as their low density, large specific surface area, excellent thermal and acoustic insulation, and high porosity. These properties are the consequence of their interesting structures characterized by pores and particles in the nanometric scale.This thesis focuses on the synthesis and characterization of aerogels and aerogel-based composites. The main objective has been the development of polyurethane-based organic aerogels obtained by sol-gel technology followed by supercritical drying. These materials present interesting optical properties (transparency to visible light), a thermal conductivity below that of the aerogels previously described for this matrix (included in the superinsulating range), achieving values of 12 mW/mK, and superior mechanical properties than the widely investigated silica aerogels. Additionally, the effect of the addition of infrared blockers on its thermal conductivity has been studied.On the other hand, the incorporation of polyurethane foams with reticulated structures during the synthesis of silica aerogels has allowed the notable improvement of their mechanical properties, providing them with great stiffness and flexibility. In addition, these materials have excellent thermal insulation. As a result of this research, the relationship between formulation-process-structure-properties has been understood, so that, through the analysis of different parameters, their influence on the final properties has been identified. Thus, certain synthesis strategies are established allowing to obtain promising aerogels with potential application in the construction, automotive, and aeronautics sectors, among others.This thesis, supervised by Prof. Dr. Miguel Ángel Rodríguez-Pérez and Prof. Dr. Fernando Villafañe González, constitutes the opening of a new research line at CellMat Laboratory, Department of Condensed Matter Physics of the University of Valladolid, allowing the development of numerous lines of future work.
YR 2022
FD 2022
LK https://uvadoc.uva.es/handle/10324/59775
UL https://uvadoc.uva.es/handle/10324/59775
LA eng
NO Escuela de Doctorado
DS UVaDOC
RD 18-may-2024