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- W2045841646 abstract "This study correlates microstructure with thermal transport properties in nanoporous solids. The model system is based on polyurea (PUA) aerogels. Those aerogels demonstrate a dramatic change in microstructure with density. Low density aerogels consist of entangled nano-fibers changing into interconnected nanoparticles as the density increases. The nanostructure was probed in terms of both particle size and network interconnectivity with scanning electron microscopy and small angle X-ray scattering. Thermal conductivity values between 0.027 and 0.066 W/mK were obtained with the hot-wire method for PUA samples with densities between 0.04 and 0.53 g/cm3. Both, pressure and temperature dependent experiments were performed for the deconvolution of total thermal conductivity into gaseous, radiative, and transport-through-the-solid-framework contributions. Subsequently, thermal conductivity along the solid framework was considered as a function of microstructure. That leads to a quantitative evaluation of the impact of primary particle characteristics and network interconnectivity on the solid thermal conductivity." @default.
- W2045841646 created "2016-06-24" @default.
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- W2045841646 date "2013-05-01" @default.
- W2045841646 modified "2023-10-14" @default.
- W2045841646 title "Correlation of microstructure and thermal conductivity in nanoporous solids: The case of polyurea aerogels synthesized from an aliphatic tri-isocyanate and water" @default.
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- W2045841646 doi "https://doi.org/10.1016/j.jnoncrysol.2013.02.029" @default.
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