Optical transmission properties of silica aerogels prepared from polyethoxidisiloxanes

Pajonk, G.M.; Elaloui, E.; Chevalier, Bruno; Begag, R.

doi:10.1016/s0022-3093(96)00600-x

Cited by 32 publications

(8 citation statements)

References 13 publications

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“…[1][2][3][4] In particular, the optical transparency of silica aerogel in the solar spectrum is crucial for many solar related applications [5][6][7][8] and has been studied extensively. [9][10][11][12][13][14][15][16][17][18] J. Fricke et al showed that the optical transparency of silica aerogels is tied closely to its microstructure which acts as Rayleigh scattering centers.…”

Section: Introductionmentioning

confidence: 99%

Modeling silica aerogel optical performance by determining its radiative properties

et al. 2016

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Silica aerogel has been known as a promising candidate for high performance transparent insulation material (TIM). Optical transparency is a crucial metric for silica aerogels in many solar related applications. Both scattering and absorption can reduce the amount of light transmitted through an aerogel slab. Due to multiple scattering, the transmittance deviates from the Beer-Lambert law (exponential attenuation). To better understand its optical performance, we decoupled and quantified the extinction contributions of absorption and scattering separately by identifying two sets of radiative properties. The radiative properties are deduced from the measured total transmittance and reflectance spectra (from 250 nm to 2500 nm) of synthesized aerogel samples by solving the inverse problem of the 1-D Radiative Transfer Equation (RTE). The obtained radiative properties are found to be independent of the sample geometry and can be considered intrinsic material properties, which originate from the aerogel’s microstructure. This finding allows for these properties to be directly compared between different samples. We also demonstrate that by using the obtained radiative properties, we can model the photon transport in aerogels of arbitrary shapes, where an analytical solution is difficult to obtain.

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Section: Introductionmentioning

confidence: 99%

Modeling silica aerogel optical performance by determining its radiative properties

et al. 2016

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“…Several prototypes have been made during the HILIT project [5] based on aerogel sheets made by Airglass AB following the optimized aerogel fabrication process developed during the project on the basis of the previously patented route [7]. The aerogel thickness was 15 ± 1 mm.…”

Section: Resultsmentioning

confidence: 99%

“…The aerogel fabrication process, which has been previously described [7,8], is based on a previously patented synthesis route performed with commercialized silica precursors (PCAS) 1 [9]. The present paper concentrates on the research and development of silica aerogel glazing and its application.…”

Section: Introductionmentioning

confidence: 99%

Development of windows based on highly insulating aerogel glazings

Jensen

Schultz

Kristiansen

2004

Journal of Non-Crystalline Solids

167

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“…They are produced from the synthesis, ageing and drying of silica based colloids (Pajonk et al, 1995;Pierre and Pajonk, 2002;Dorcheh and Abbasi, 2008). Their transparency and insulation properties heavily depend on the process of their production (Pajonk et al, 1997;Rigacci et al, 1998). They have been searched for integration in buildings wallboard (Spaceloft, 2014), as external coating to suppress thermal bridges in retrofitting cases (Ibrahim et al, 2014) and to enhance the thermal insulation of double glazing windows (Rubin and Lampert, 1983;Reim et al, 2002;Schultz et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Full scale experimentation on a new translucent passive solar wall combining silica aerogels and phase change materials

et al. 2015

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International audienceThis paper presents the first passive solar wall providing simultaneously super insulation, heat storage and daylighting to the inner space. The wall’s external layer is composed of a silica aerogels bed for high insulation and solar radiation transmission. The second layer, internal, is composed of glass bricks filled with a eutectic phase change material (PCM) for heat storage and restitution. The whole wall is translucent. The experimentations carried out to characterize thermal and optical properties of the materials used are described. Then results are given for a full scale comparative experimentation on a twin zones building located in the south of France for the solar wall and a standard opaque high thermal capacity wall. Results show the heat losses through the wall are very low while the heat and light gains are high: The U value of the solar wall is 0.59 W m−1 K−1 and 0.72 W m−1 K−1 respectively when the PCM is in liquid and solid state. With the test building in free floating condition, the temperature difference between the outdoor and indoor air provided by the wall is about 9 °C in winter. The wall can provide up to 500 lux to the inner environment, which is sufficient for conference rooms. The tested wall has proven more effective in winter and shoulder season, particularly for cold sunny climates, but may cause overheating in summer

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Optical transmission properties of silica aerogels prepared from polyethoxidisiloxanes

Cited by 32 publications

References 13 publications

Modeling silica aerogel optical performance by determining its radiative properties

Modeling silica aerogel optical performance by determining its radiative properties

Development of windows based on highly insulating aerogel glazings

Full scale experimentation on a new translucent passive solar wall combining silica aerogels and phase change materials

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