scholarly journals Synthesis of lightweight polymer-reinforced silica aerogels with improved mechanical and thermal insulation properties for space applications

2014 ◽  
Vol 197 ◽  
pp. 116-129 ◽  
Author(s):  
Hajar Maleki ◽  
Luisa Durães ◽  
António Portugal
Keyword(s):  
Thermal Insulation ◽  
Silica Aerogels ◽  
Space Applications

scholarly journals Cellulose Aerogels for Thermal Insulation in Buildings: Trends and Challenges

Coatings ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 345 ◽  
Author(s):  
Danny Illera ◽  
Jaime Mesa ◽  
Humberto Gomez ◽  
Heriberto Maury
Keyword(s):  
Thermal Stability ◽  
Thermal Insulation ◽  
Gaseous Phase ◽  
Energy Demand ◽  
Cost Effective ◽  
Silica Aerogels ◽  
Moisture Sensitivity ◽  
Knudsen Effect ◽  
Cellulose Aerogel ◽  
Current Trends

Cellulose-based aerogels hold the potential to become a cost-effective bio-based solution for thermal insulation in buildings. Low thermal conductivities (<0.025 W·m−1·K−1) are achieved through a decrease in gaseous phase contribution, exploiting the Knudsen effect. However, several challenges need to be overcome: production energy demand and cost, moisture sensitivity, flammability, and thermal stability. Herein, a description and discussion of current trends and challenges in cellulose aerogel research for thermal insulation are presented, gathered from studies reported within the last five years. The text is divided into three main sections: (i) an overview of thermal performance of cellulose aerogels, (ii) an identification of challenges and possible solutions for cellulose aerogel thermal insulation, and (iii) a brief description of cellulose/silica aerogels.

Improvement of thermal insulation performance of silica aerogels by Al2O3 powders doping

2017 ◽  
Vol 43 (14) ◽  
pp. 10799-10804 ◽  
Author(s):  
Yaofei Lei ◽  
Xiaohong Chen ◽  
Huaihe Song ◽  
Zijun Hu ◽  
Bin Cao
Keyword(s):  
Thermal Insulation ◽  
Silica Aerogels ◽  
Insulation Performance

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

2017 ◽  
Vol 727 ◽  
pp. 871-878 ◽  
Author(s):  
Vinayak G. Parale ◽  
Hae-Noo-Ree Jung ◽  
Wooje Han ◽  
Kyu-Yeon Lee ◽  
Dinesh B. Mahadik ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Insulation ◽  
Silica Aerogels ◽  
Insulation Performance

scholarly journals Alumina-Doped Silica Aerogels for High-Temperature Thermal Insulation

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 122
Author(s):  
Yu Wu ◽  
Xiaodong Wang ◽  
Lin Liu ◽  
Ze Zhang ◽  
Jun Shen
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Thermal Insulation ◽  
Large Scale ◽  
Low Cost ◽  
Linear Shrinkage ◽  
Silica Aerogels ◽  
Hydroxyl Groups ◽  
Scale Production ◽  
Α Al2o3

In this study, we used two methods to prepare alumina-doped silica aerogels with the aim of increasing the thermal stability of silica aerogels. The first method was physical doping of α-Al2O3 nano powders, and the second method was to create a chemical compound via the co-precursor of TEOS and AlCl3·6H2O in different proportions. The shrinkage, chemical composition, and specific surface area (SSA) of samples after heating at different temperatures were analyzed. Our results show that the silicon hydroxyl groups of samples derived from AlCl3·6H2O gradually decreased and nearly disappeared after heating at 800 °C, which indicates the complete dehydration of the silicon hydroxyl. Thus, the samples exhibited a large linear shrinkage and decreased SSA after high-temperature heat treatment. By contrast, samples doped with α-Al2O3 powders retained abundant silicon hydroxyl groups, and the 6.1 wt.% α-Al2O3-doped sample exhibited the lowest linear shrinkage of 11% and the highest SSA of 1056 m2/g after heat treatment at 800 °C. The alumina-doped silica aerogels prepared using a simple and low-price synthesized method pave the way for the low-cost and large-scale production of high-temperature thermal insulation.

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