Synthesis and Characterization of Aerogel Glass Materials for Window Glazing Applications

Gao, Tao; Jelle, Bjørn Petter; Gustavsen, Arild; He, Jianying

doi:10.1002/9781119040392.ch12

Cited by 3 publications

(5 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where ρr is the relative density, rw is the hydraulic radius (characteristic pore size), and Kw is the so-called Kozeny constant. However, in the case of gels, Kw is a function of ρr [25]. Over the range of density used in this study, it can be approximated by: w r r 2.03 2.56 , 0.08 0.4.…”

Section: Multicomponent Glassesmentioning

confidence: 99%

“…However, monolithic aerogel panes are very brittle, their typical flexural strength varies between 1 kPa and 1 MPa, [6], making their application as window glazing materials questionable. A report in the literature [25] describes an approach to synthesize glass windows via densification of silica aerogels. Although the loss of porosity and the resulting increase in thermal conductivity are drawbacks linked to the densification process, a combination of enhanced mechanical performance and optical transparency suggests that partially sintered silica aerogels could be used as new material for window glazing.…”

Section: Porous Glassesmentioning

confidence: 99%

“…Preliminary experimental results indicated lighter weight (density 1.8 g/cm 3 , compared to 2.5 g/cm 3 for float glass) and improved thermal insulation (thermal conductivity k ≈ 0.18 W/(mK), compared to 0.92 W/(mK) for float glass. Aerogel glass materials with high visible transparency (Tvis ≈ 95.4% at 500 nm compared to 92.0% for float glass) can be achieved by annealing an acid-catalyzed silica aerogel precursor at 700 °C [ 25].…”

Section: Porous Glassesmentioning

confidence: 99%

See 2 more Smart Citations

Porous Glasses, Binary Glasses, and Composite Glasses from Aerogels

Woignier,

Reynes,

Phalippou

2023

Springer Handbooks

View full text Add to dashboard Cite

This chapter describes the different steps of the transformations of a gel into an aerogel and into glass and the physical properties of the different materials derived from sintered silica aerogels. Silica glasses can be synthesized by sintering silica aerogels at temperatures ranging from 900 to 1,200 °C close to half the temperatures used for the glass melting process. The heat treatment can be taillored to obtain fully densified or porous glasses. Supercritical drying also enables the synthesis of aerogels from a wide range of binary compositions giving rise to binary or ternary silicate glasses after sintering. Another interesting application of aerogels is as a host matrix for the synthesis of multi-phase materials, doped material glasses, or composites. Their large pore volume is used as a sponge to incorporate chemical species in such a way as to form a two-phase material. The chemical species are first processed in liquid form and can be dried after the pores are filled. The result is a nanocomposite material composed of salt oxide embedded in the silica matrix.

show abstract

Section: Multicomponent Glassesmentioning

confidence: 99%

Section: Porous Glassesmentioning

confidence: 99%

Section: Porous Glassesmentioning

confidence: 99%

See 1 more Smart Citation

Porous Glasses, Binary Glasses, and Composite Glasses from Aerogels

Woignier,

Reynes,

Phalippou

2023

Springer Handbooks

View full text Add to dashboard Cite

show abstract

“…The "aerogel" is a solid material, amorphous and highly porous (80-99% porosity) [5] that can be transformed into silica glasses by a sequence of sintering treatments [9,10,11]. Depending on the duration of the heat treatment, porosity is progressively eliminated [11].…”

Section: ) Introductionmentioning

confidence: 99%

Porous glasses from aerogels: from organic liquid to mineral materials

Woignier

Duffours²,

Primera

2022

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

According to an easy sintering stage, composite aerogels are alternative ways to synthesize silica glass at temperatures ranging from 900 to 1200 °C, close to half the temperatures used for the glass melting process. The heat treatment is tailored to obtain fully densified or porous glasses. The kinetics of dimensional shrinkage is characterized during the sintering mechanism, and we confirmed that the viscous flow-sintering model also applies to composite aerogels. Porous glasses with a broad range of porosity and physical properties (mechanical strength, elasticity modulus, permeability) have been synthesized. The open pore structure is used to synthesize glass ceramics.

show abstract

“…Aerogels main physical properties such as mechanical properties, permeability, transparency, insulation, etc. are mainly govern by their microstructure [ 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 ], which has been extensively studied during the past decades by different scattering techniques (SAXS, SANS, light scattering [ 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 ]). The silica aerogel microstructure is generally described as a fractal network at length scales ranging from 1 to 100 nm.…”

Section: Introductionmentioning

confidence: 99%

Fractal Structure in Silica and Composites Aerogels

Woignier

Primera

Alaoui

et al. 2020

Gels

View full text Add to dashboard Cite

Silica aerogels are known to be materials with exceptional characteristics, such as ultra-low density, high surface area, high porosity, high adsorption, and low-thermal conductivity. In addition, these unique properties are mainly related to their specific processing. Depending on the aerogel synthesis procedure, the aerogels texture can be tailored with meso and/or macroporosity. Fractal geometry has been observed and used to describe silica aerogels at nanoscales in certain conditions. In this review paper, we describe the fractal structure of silica aerogels that can develop depending on the synthesis conditions. X-ray and neutron scattering measurements allow to show that silica aerogels can exhibit a fractal structure over one or even more than two orders of magnitude in length. The fractal dimension does not depend directly on the material density but can vary with the synthesis conditions. It ranges typically between 1.6 and 2.4. The effect of the introduction of silica particles or of further thermal treatment or compression of the silica aerogels on their microstructure and their fractal characteristics is also resumed.

show abstract

Synthesis and Characterization of Aerogel Glass Materials for Window Glazing Applications

Cited by 3 publications

References 26 publications

Porous Glasses, Binary Glasses, and Composite Glasses from Aerogels

Porous Glasses, Binary Glasses, and Composite Glasses from Aerogels

Porous glasses from aerogels: from organic liquid to mineral materials

Fractal Structure in Silica and Composites Aerogels

Contact Info

Product

Resources

About