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Rigid foams were prepared using quebracho tannins and their physical and thermal properties were determined experimentally. These properties were then compared to those of rigid foams derived from mimosa tannins and pine tannins to determine if the nature of the flavonoid affects the properties of the foams. It was found that the preparation of the quebracho tannin-based foams involved the same formulation as that of mimosa tannin-based foams, whereas the ...
Poly(methyl methacrylate)-silica nanocomposite (PSN) foams were formulated for the comparison of the effect of vinyl-modified silica (VMS) and raw silica (RS) particles on cell structure, insulation properties, and insulation properties. It was found that those thermoplastic foams containing VMS particles had improved dispersion capability than those containing RS particles. The incorporation of VMS particles was found to reduce the cell size and increase the cell density of the ...
Coal fly ash was used as the base material for the formation of thermal insulation materials. The porosity of the produced materials ranged from 86.3-94.5 vol. %. The insulating materials were prepared by ball milling, followed by foaming assisted by the addition of K12, casting and drying, and finally sintering. No harmful chemicals were released to the environment during their preparation. It was found that the thermal conductivity of the samples ...
The authors have presented a review of steady-state and transient measurement techniques for the determination of thermal conductivity, and have introduced a new method for the determination of thermal transport properties in anisotropic building materials, known as the dynamic adiabatic technique. It was found that the technique was functional for a first estimation of thermal properties in a complex structure, but that it required long testing times....
The authors present the synthesis of hollow silica nanospheres (HSNSs) by a template-assisted approach using polystyrene nanospheres as templates. These nanospheres could potentially be used as nano insulation materials due to their low thermal conductivity ~0.02 W/m K. The authors also examined the environmental footprint of these nanospheres by life cycle assessment, and it was found that they possess a high embodied energy. It was thus suggested that new synthetic ...
