Silica-aerogel granulate – Structural, optical and thermal properties

Reim, Michaela; Reichenauer, Gudrun; Körner, Werner; Manara, Jochen; Arduini-Schuster, M.; Korder, S.; Beck, Andreas; Fricke, J.

doi:10.1016/j.jnoncrysol.2004.06.048

Cited by 96 publications

(45 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is consistent with the results for nitrogen at 50-10 5 Pa and SRM at 10 4 -10 5 Pa. Although the thermal conductivity is higher for our cryogel powders than for aerogels prepared by supercritical drying in reports [24,36], our technique is simple and inexpensive, and can be used in large-scale thermal insulating applications at low pressures, such as vacuum insulating plates [37] and silica granulate insulating materials [38,39].…”

Section: Thermal Conductivitysupporting

confidence: 88%

“…Figure B.1 shows a schematic of the GHP 456 Titan setup used for testing cryogel powders, which is similar to the previous ones such as the vacuum hotplate setups reported in [44,45]. The measurement of thermal conductivity consisted of the following steps: firstly, a glass-fiber board (NIST-certified standard reference material 1450c) was measured over the certified temperature range (0-60…”

Section: Appendix Bmentioning

confidence: 96%

See 1 more Smart Citation

Low-cost and fast synthesis of nanoporous silica cryogels for thermal insulation applications

Liu

Tanaka

et al. 2012

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

Nanoporous silica cryogels with a high specific surface area of 1095 m 2 g −1 were fabricated using tert-butyl alcohol as a reaction solvent, via a cost-effective sol-gel process followed by vacuum freeze drying. The total time of cryogel production was reduced markedly to one day. The molar ratio of solvent/precursor, which was varied from 5 to 13, significantly affected the porous structure and thermal insulating properties of the cryogels. The silica cryogels with low densities in the range of 0.08-0.18 g cm −3 and thermal conductivities as low as 6.7 mW (m · K) −1 at 100 Pa and 28.3 mW (m · K) −1 at 10 5 Pa were obtained using this new technique.

show abstract

Section: Thermal Conductivitysupporting

confidence: 88%

Section: Appendix Bmentioning

confidence: 96%

Low-cost and fast synthesis of nanoporous silica cryogels for thermal insulation applications

Liu

Tanaka

et al. 2012

Science and Technology of Advanced Materials

View full text Add to dashboard Cite

show abstract

“…radiation with a wavelength between 380 and 780 nm). Monolith translucent silica aerogel in a 10 mm thick packed bed has a solar transmittance T SOL of 0.88 [58]. Heat treatment of the aerogels can increase their transparency further, i.e.…”

Section: Optical Propertiesmentioning

confidence: 99%

“…A granular aerogel based window was developed by ZAE Bayern (Germany) [57][58][59]83]. Here, two types of granular aerogel are used in prototype windows: Semi transparent spheres with a solar transmittance T SOL of 0.53 for a 10 mm packed bed and highly translucent granulates with a T SOL of 0.88.…”

Section: Translucent Aerogel Insulation Materialsmentioning

confidence: 99%

Aerogel insulation for building applications: A state-of-the-art review

Bætens

Jelle

Gustavsen

2011

Energy and Buildings

950

465

View full text Add to dashboard Cite

Aerogels are regarded as one of the most promising high performance thermal insulation materials for building applications today. With a thermal conductivity down to 13 mW/(mK) for commercial products they show remarkable characteristics compared to traditional thermal insulation materials. Also the possibility of high transmittances in the solar spectrum is of high interest for the construction sector. With the proper knowledge they give both the architect and engineer the opportunity of re-inventing architectural solutions. Within this work, a review is given on the knowledge of aerogel insulation in general and for building applications in particular.

show abstract

“…For further information on aerogel granules and their properties see works by Reim et al (2004Reim et al ( , 2005. The low T vis (as a result of sufficient large thickness and thus low U g ), together with the high costs, are the major downsides of aerogel glazing at the moment, as the products are more suited to roofing and facades in commercial buildings and sports halls and are not yet in a position to challenge conventional residential windows where transparent (and not translucent) glazing most often will be a requirement.…”

Section: Aerogelsmentioning

confidence: 99%

Fenestration of today and tomorrow: A state-of-the-art review and future research opportunities

Jelle

Hynd

Gustavsen

et al. 2012

Solar Energy Materials and Solar Cells

466

216

View full text Add to dashboard Cite

Fenestration of today is continuously being developed into the fenestration of tomorrow, hence offering a steadily increase of daylight and solar energy utilization and control, and at the same time providing a necessary climate screen with a satisfactory thermal comfort. Within this work a state-of-the-art market review of the best performing fenestration products has been carried out, along with an overview of possible future research opportunities for the fenestration industry. The focus of the market review was low thermal transmittance (Uvalue). The lowest centre-of-glass U g -values found was 0.28 W/(m 2 K) and 0.30 W/(m 2 K), which was from a suspended coating glazing product and an aerogel glazing product, respectively. However, the majority of high performance products found were triple glazed. The lowest frame U-value was 0.61 W/(m 2 K). Vacuum glazing, smart windows, solar cell glazing, window frames, self-cleaning glazing, low-emissivity coatings and spacers were also reviewed, thus also representing possibilities for controlling and harvesting the solar radiation energy. Currently, vacuum glazing, new spacer materials and solutions, electrochromic windows and aerogel glazing seem to have the largest potential for improving the thermal performance and daylight and solar properties in fenestration products. Aerogel glazing has the lowest potential U-values, ~ 0.1 W/(m 2 K), but requires further work to improve the visible transmittance. Electrochromic vaccum glazing and evacuated aerogel glazing are two vacuum related solutions which have a large potential. There may also be opportunities for completely new material innovations which could revolutionize the fenestration industry.

show abstract

Silica-aerogel granulate – Structural, optical and thermal properties

Cited by 96 publications

References 9 publications

Low-cost and fast synthesis of nanoporous silica cryogels for thermal insulation applications

Low-cost and fast synthesis of nanoporous silica cryogels for thermal insulation applications

Aerogel insulation for building applications: A state-of-the-art review

Fenestration of today and tomorrow: A state-of-the-art review and future research opportunities

Contact Info

Product

Resources

About