Coupling of gaseous and solid thermal conduction in porous solids

Swimm, K.; Vidi, S.; Reichenauer, Gudrun; Ebert, Hans-Peter

doi:10.1016/j.jnoncrysol.2016.11.012

Cited by 55 publications

(20 citation statements)

References 11 publications

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“…In the simplest case, the phenomenon can be described as a series connection of thermal resistances. Swimm [24] describes, that for common insulation materials, where s is significantly higher than g the simple linear relation shown in Eq. (9) is valid.…”

Section: Coupling Effectmentioning

confidence: 99%

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Correlation of pore size distribution with thermal conductivity of precipitated silica and experimental determination of the coupling effect

Sonnick

Meier

Ross-Jones

et al. 2019

Applied Thermal Engineering

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Section: Coupling Effectmentioning

confidence: 99%

“…The previous results visualize the important role of the coupling effect. For the present investigation the linear model from Swimm et al [24] is used. It is determined that for most of the tested samples the model fits very well.…”

Section: Determination Of the Coupling Effectmentioning

confidence: 99%

Correlation of pore size distribution with thermal conductivity of precipitated silica and experimental determination of the coupling effect

Sonnick

Meier

Ross-Jones

et al. 2019

Applied Thermal Engineering

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“…Figure 3 b depicts that the thermal conductivity of the silica aerogel composite continuously increased with the rise of temperature [ 18 , 27 , 28 ]. This phenomenon is attributed to the rapid increase in radiant thermal conductivity at high temperatures.…”

Section: Resultsmentioning

confidence: 99%

Facile Preparation of High Strength Silica Aerogel Composites via a Water Solvent System and Ambient Pressure Drying without Surface Modification or Solvent Replacement

Liu

Jiang

et al. 2021

Materials

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To further reduce the manufacturing cost and improve safety, silica aerogel composites (SAC) with low density and low thermal conductivity synthesized via ambient pressure drying (APD) technology have gradually become one of the most focused research areas. As a solvent, ethanol is flammable and needs to be replaced by other low surface tension solvents, which is dangerous and time-consuming. Therefore, the key steps of solvent replacement and surface modification in the APD process need to be simplified. Here, we demonstrate a facile strategy for preparing high strength mullite fiber reinforced SAC, which is synthesized by APD using water as a solvent, rather than using surface modification or solvent replacement. The effects of the fiber density on the physical properties, mechanical properties, and thermal conductivities of SAC are discussed in detail. The results show that when the fiber density of SAC is 0.24 g/cm3, the thermal conductivity at 1100 °C is 0.127 W/m·K, and the compressive strength at 10% strain is 1.348 MPa. Because of the simple synthesis process and excellent thermal-mechanical performance, the SAC is expected to be used as an efficient and economical insulation material.

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“…Besides the influence of the average pore size, different porosity and the interaction constant between gas molecules and pore walls of the two aerogels also affect the gas thermal conductivity. In addition, the gas‐solid coupling thermal conductivity may also affect this part of the thermal conductivity 55 . It can be seen from the total thermal conductivity that the PBO/SiO 2 aerogels showed better thermal insulation properties than PBO aerogels.…”

Section: Resultsmentioning

confidence: 99%

In situ co‐polymerization of high‐performance polybenzoxazine/silica aerogels for flame‐retardancy and thermal insulation

Xiao

Cai

et al. 2020

J of Applied Polymer Sci

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Materials with high‐performance thermal insulation and excellent flame‐resistance are incredibly desirable for energy conservation and fire safety. In this study, a novel hybrid nanostructure network polybenzoxazine/silica (PBO/SiO2) aerogels were fabricated through facile in situ co‐polymerization sol‐gel methods with ambient pressure drying using benzoxazine (BO) monomers and SiO2 sol as reaction source, N, N‐dimethylformamide (DMF) as the solvent and hydrochloric acid (HCl) as the catalyst. The hybrid nanostructure network was retained by polymerization–induced nanoscale phase separation of PBO and SiO2. The resulting PBO/SiO2 aerogels exhibited finer microstructure, lower density (0.18 g/cm3), thermal conductivity (0.031 W/m·K), and better flame‐resistance in comparison with PBO aerogels. They demonstrated an excellent compressive strength of 0.81 to 1.12 MPa at 10% deformation. The remarkable improvement in thermal insulation and flame‐resistance of PBO/SiO2 aerogels could be attributed to the combined effects of finer microstructure and formation of SiO2 that was “in‐situ” interpenetrated and interacted with silanols (Si‐OH) in the PBO network during the combustion process. The successful synthesis of PBO/SiO2 aerogels highlights the possibility of fabricating a novel high‐performance thermal insulation and excellent flame‐resistance used for energy‐efficient buildings.

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Coupling of gaseous and solid thermal conduction in porous solids

Cited by 55 publications

References 11 publications

Correlation of pore size distribution with thermal conductivity of precipitated silica and experimental determination of the coupling effect

Correlation of pore size distribution with thermal conductivity of precipitated silica and experimental determination of the coupling effect

Facile Preparation of High Strength Silica Aerogel Composites via a Water Solvent System and Ambient Pressure Drying without Surface Modification or Solvent Replacement

In situ co‐polymerization of high‐performance polybenzoxazine/silica aerogels for flame‐retardancy and thermal insulation

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