Densification kinetics and structural evolution during sintering of silica aerogel

Scherer, George W.; Calas, S.; Sempéré, R.

doi:10.1016/s0022-3093(98)00696-6

Cited by 33 publications

(17 citation statements)

References 21 publications

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“…6-8, it is evident that the resistance level is in direct relation with the heat-treatment. This result is consistent with the fact that, increasing heat-treatment decreases the pore diameter [36,37] which in turn gives rise to nanowires of smaller diameter. It has been reported earlier that silver-glass nanocomposite containing silver particle with diameter of 3 nm showed an electric conductivity less than Mott's minimum metallic conductance [35,38].…”

Section: Samplesupporting

confidence: 90%

Preparation and characterization of silver nanoparticles within silicate glass ceramics via modification of ion exchange process

Abdel-Hameed¹,

Fathi

2010

Journal of Alloys and Compounds

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Section: Samplesupporting

confidence: 90%

Preparation and characterization of silver nanoparticles within silicate glass ceramics via modification of ion exchange process

Abdel-Hameed¹,

Fathi

2010

Journal of Alloys and Compounds

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“…[24], Brinker and Scherer [23], Scherer [30] and Yoldas [31] have shown that with thermal treatment, the microstructure is densified. This densification leads to the formation of new siloxane bonds at the interface of the particles by the condensation of the surface silanol groups.…”

Section: Fired Silica Gelsmentioning

confidence: 99%

Microstructure and transmittance of silica gels for application as transparent heat insulation materials

Klenert

Fruhstorfer

Aneziris

et al. 2015

J Sol-Gel Sci Technol

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Transparent heat insulation materials (TIMs) exhibit great potential for different solar applications. Despite this fact, they are not used widely, since they are either very expensive (aerogel) or made from organic materials and, thus, are not resistant to higher temperatures. Xerogel, obtained from silica gel by drying at ambient pressure, is a promising material for the production of TIMs. This study investigates different treatments applied during the production of silica gel and their influence on its optical and structural properties. To this end, silica sol was gelled and the resulting silica gel was aged before it was either hydrothermally treated or fired. Subsequently, radiation transmission measurements from 400 to 2700 nm as well as porosity, specific surface area, and scanning electron microscopic/transmissions electron microscopic measurements were conducted. It was found that under certain conditions, the transmittance can be improved by firing as well as by hydrothermal treatment. Firing at 600°C with 10-min dwell time and hydrothermal treatment at 120°C with 5-h dwell time resulted in the silica gels with the highest transmittance of 63 up to 66 %. The porosity (24-76 %), the pore radii (3-26 nm), and the specific light absorption by embedded water and SiOH molecules could be adjusted over a wide range. Graphical abstract

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“…Our early focus was on characterization of the elastic properties of the network, including the elastic efficiency (or, load-bearing fraction) of the network [1,2]. We also studied methods for characterization of the network, including development of a new model for adsorption on networks [3,4,5] that was used to follow the evolution of microstructure during sintering [6,7]. We proved that aerogels contract severely during nitrogen condensation in a standard adsorption experiment [8,9,10] and showed how the (erroneous) measured size distribution could be corrected [11].…”

Section: Unexpended Funds: Nonementioning

confidence: 99%

Mechanical Properties of Gels; Stress from Confined Fluids

Scherer¹

2009

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Unexpended funds: NoneThis program began under the title of "Mechanical Properties of Gels", with the goal of understanding how the elastic modulus of a gel is controlled by its structure. Our early focus was on characterization of the elastic properties of the network, including the elastic efficiency (or, load-bearing fraction) of the network [1,2]. We also studied methods for characterization of the network, including development of a new model for adsorption on networks [3,4,5] that was used to follow the evolution of microstructure during sintering [6,7]. We proved that aerogels contract severely during nitrogen condensation in a standard adsorption experiment [8,9,10] and showed how the (erroneous) measured size distribution could be corrected [11]. The phenomenon of shrinkage during adsorption has recently attracted considerable interest, as indicated by the dedication of an entire session to it at a recent conference [12]. We also developed a novel method for measuring the gas permeability of aerogels over a wide range of pressure [13].The next few years were devoted to an extremely fruitful program of computer simulation in which we developed a new algorithm for simulating growth of clusters, allowing for flexibility in the branches [14]. This model, developed by Hang-Shing Ma in collaboration

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Densification kinetics and structural evolution during sintering of silica aerogel

Cited by 33 publications

References 21 publications

Preparation and characterization of silver nanoparticles within silicate glass ceramics via modification of ion exchange process

Preparation and characterization of silver nanoparticles within silicate glass ceramics via modification of ion exchange process

Microstructure and transmittance of silica gels for application as transparent heat insulation materials

Mechanical Properties of Gels; Stress from Confined Fluids

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