Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 12, Issue 10, Pages 11815-11824Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b20923
Keywords
palygorskite-based; aerogel; thermal insulation; hydrophobicity; flame retardancy
Funding
- National Natural Science Foundation of China [21878159, 51574130]
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Clay-based aerogel is a promising material in the field of thermal insulation and flame retardant, but obtaining clay- based aerogel with high fire resistance, low thermal conductivity, hydrophobicity, and mechanical robustness remains a challenge. In this work, palygorskite-based aerogel was successfully fabricated via combining with a very small proportion of alginate to form a distinctive hierarchically meso-microporous structure. By employing ethanol solution (EA) replacement method and freeze-drying process, the resultant aerogel exhibited ultralow density (0.035-0.052 g/cm(3)), practical mechanical strengths (0.7-2.1 MPa), and low thermal conductivity of 0.0332-0.165 W/mK (25-1000 degrees C). The hydrophobicity of aerogel was achieved by simple chemical vapor deposition of methyltrimethoxysilane (MTMS). The Pal-based aerogel showed good performance in both fire resistance with high limiting oxygen index up to 90%, and heat resistance with tolerance of flame up to 1000 degrees C for 10 min. This renewable Pal-based aerogel with a 3D framework is a promising material to be applied in fields of construction and aerospace for thermal insulation and high fire resistance.
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