Improvement in the high temperature thermal insulation performance of Y2O3 opacified silica aerogels

Parale, Vinayak G.; Jung, Hae Noo Ree; Han, Wooje; Lee, Kyu Yeon; Mahadik, D. B.; Cho, Hyung Hee; Park, Hyung Ho

doi:10.1016/j.jallcom.2017.08.189

Cited by 42 publications

(11 citation statements)

References 30 publications

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“…The effective total thermal conductivity of porous material is mainly consisted of three parts, solid phase thermal conductivity ( λ s ), gaseous phase thermal conductivity ( λ g ) and radiative conductivity ( λ r ). It could be expressed as Equation

λ_{total} = λ_{normals} + λ_{normalg} + λ_{normalr} .

…”

Section: Resultsmentioning

confidence: 99%

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Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

et al. 2019

Int J Applied Ceramic Tech

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High-temperature properties including compressive strength, thermal shock behavior, and thermal conductivity of porous anorthite ceramics with high specific strength were tested and analyzed. The results showed that the prepared materials merit hightemperature compressive strength, thermal stability, and conductivity. With the appropriate fabrication parameters, even though containing 0.33 g/cm 3 bulk density and 88.2% porosity, its compressive strength could reach 2.03 MPa at 1000°C, 147% of that at room temperature; the residual strength ratio kept as 114.7% after a thermal shock at 1200°C. The X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM) showed that anorthite grains refinement and intergranular voids filling by liquid phase were main factors for the high strength. From room temperature to 1200°C, its thermal conductivity only varied from 0.085 to 0.258 W·(m·K) −1 . High porosity, a large number of nanoregions in anorthite grains and amorphous phase in grain boundary were main reasons for low thermal conductivity. K E Y W O R D S anorthite, porous materials, strength, thermal conductivity How to cite this article: Wu L, Li C, Li H, et al. Preparation and characteristics of porous anorthite ceramics with high porosity and high-temperature strength. Int J Appl Ceram Technol. 2020;17:963-973.

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λ_{total} = λ_{normals} + λ_{normalg} + λ_{normalr} .

…”

Section: Resultsmentioning

confidence: 99%

“…Because, the ( λ r ) was not obvious at low temperature, but the heat radiation increased sharply after 500°C . Radiative conductivity ( λ r ) could be explained by Equation

λ_{normalr} = \frac{16 σ n^{2} T^{3}}{3 ρ e},

where σ is the Stefen‐Boltzmann constant, n is the effective index of refraction, e is the effective specific extinction coefficient.…”

Section: Resultsmentioning

confidence: 99%

Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

et al. 2019

Int J Applied Ceramic Tech

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“…Silica aerogels are unique nanostructured materials showing superior properties such as high porosity (≤99.8%), high specific surface area (≤1200 m 2 /g), low bulk density (≥0.003 g/cm), low refraction index (∼1.05), ultra‐low dielectric constant ( k = 1.0–2.0), and low thermal conductivity (0.005–0.1 W(mK) −1 ) . Due to these desirable properties, silica aerogels are promising materials for application in adsorption, catalysis, drug delivery, enzyme immobilization, and thermal insulation …”

Section: Wheat Husk Silica‐based Materialsmentioning

confidence: 99%

“…[70][71][72] Due to these desirable properties, silica aerogels are promising materials for application in adsorption, 73 catalysis, 74 drug delivery, 75 enzyme immobilization, 76 and thermal insulation. 77 Wheat husk ash was converted into silica aerogel by Liu et al 52 by treating wheat husk with hydrochloric acid solution, followed by calcination at 600°C for 4 hr and further boiling with sodium hydroxide aqueous solution for 2 hr. The filtrate, sodium silicate, was used to prepare silica wet gels by resin-exchange-alkali-catalysis method.…”

Section: Silica Aerogelmentioning

confidence: 99%

Review on a novel biosilica source for production of advanced silica‐based materials: Wheat husk

Terzioğlu

Yücel

Kuş

2018

Asia-Pacific J Chem Eng

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The growing cognizance of environmental matters elucidates the increasing attention thought the evaluation of bio‐based by‐products and waste materials in various applications. The agricultural‐based industry results in considerable amounts of residues containing silica. In the past decade, extensive research studies had been executed to evaluate agricultural waste materials such as rice husk and rice straw. The results of the studies point out the possibility of evaluating such wastes to produce silica‐based materials. Wheat husk is such an abundantly available waste obtained from the wheat milling process. It is containing noncrystalline silica, and thus, it can also be evaluated to produce value added materials. This study presents a comprehensive overview of the researches carried out on the properties and utilization of wheat husk as a silica source. The summary and discussion presented in this review would provide knowledge on wheat husk that is convenient to be utilized for the low‐cost and sustainable production of silica‐based materials such as aerogel, metal silicates, zeolite, silica‐based ceramics, and composites.

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“…In this study, we prefer cellulose fibers in an aerogel form because the cellulose aerogels is eco-friendly, cost-effective, easy to install and handle, and very stable under ambient conditions [9][10][11][12]. Aerogel insulations [13,14] are four times more efficient than glass fibers, cheaper and is the obvious choice for most insulation applications [6]. Heat transfer in porous materials, like aerogels, is based on three processes: Heat conduction in the solid phase, and heat convection through the gaseous phase present in the porous structure of the aerogel, and heat radiation [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Recycled Cellulose Aerogels from Paper Waste for a Heat Insulation Design of Canteen Bottles

Zhen

Thai

Nguyen

et al. 2019

Fluids

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Exercising in a tropical climate with constant high temperatures and high humidity increases the risk of heatstroke for active people who frequently train outdoors. For these active persons, a cooling source of water nearby can be essential, and this is usually carried in canteen bottles. However, commercially available water canteen bottles have limited thermal insulation capability to keep the liquid content cooled for the required period. This work proposed an engineering solution to enhance the heat insulation performance of water canteen bottles, using recycled cellulose aerogels made from paper waste for the first time as an insulating layer. Recycled cellulose aerogels wrapped around the water canteen bottle provides excellent thermal insulation performance, while not adding significant weight to the bottle. The temperature of the ice slurry in the canteen bottle was measured periodically over four hours with a mercury thermometer. The effects of the static and dynamic conditions on the temperature rate were also quantified. A 1.5 cm thickness of 1.0 wt.% recycled cellulose aerogel wrapped around the canteen bottle can provide an excellent thermal insulation performance with the lowest rise in temperature, achieving a low final temperature of the ice slurry content of 3.5 °C after 4 h. This result is much better than that provided by available commercial bottles under the same conditions.

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Improvement in the high temperature thermal insulation performance of Y2O3 opacified silica aerogels

Cited by 42 publications

References 30 publications

Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

Preparation and characteristics of porous anorthite ceramics with high porosity and high‐temperature strength

Review on a novel biosilica source for production of advanced silica‐based materials: Wheat husk

Recycled Cellulose Aerogels from Paper Waste for a Heat Insulation Design of Canteen Bottles

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