Back to Search Start Over

In-Situ Synthesis of Layered Double Hydroxide/Silica Aerogel Composite and Its Thermal Safety Characteristics.

Authors :
Sun, Mengtian
Wang, Yang
Wang, Xiaowu
Liu, Qiong
Li, Ming
Shulga, Yury M.
Li, Zhi
Source :
Gels (2310-2861); Sep2022, Vol. 8 Issue 9, p581-581, 17p
Publication Year :
2022

Abstract

To adjust the thermal safety of hydrophobic silica aerogel, layered double hydroxide (LDH)/silica aerogel (SA) composites were prepared by an in-situ sol-gel process at ambient pressure. This study found the physical combination of SA and MgAl-LDH based on the FTIR spectra and phase composition of LDH/SA. The N<subscript>2</subscript> sorption analysis confirms that the introduction of MgAl-LDH does not change the mesoporous attribution of LDH/SA significantly. With the increase in MgAl-LDH addictive content, the low density (0.12–0.13 g/cm<superscript>3</superscript>), low thermal conductivity (24.28–26.38 mW/m/K), and large specific surface area (730.7–903.7 m<superscript>2</superscript>g) of LDH/SA are still maintained, which can satisfy the requirements of thermal insulation. The TG-DSC analysis demonstrates that the endothermic effects and metal oxides formed during the MgAl-LDH decomposition are beneficial to the improvement of the thermal stability of LDH/SA composites. In addition, it was found that the gross calorific values of LDH/SA composites decrease with an increase in MgAl-LDH addictive content, all of which are lower than that of the pure SA. The research outcomes indicate that the thermal safety of LDH/SA composites is enhanced significantly by doping MgAl-LDH without impairing too many of the excellent properties, which benefits their expansion in the thermal insulation field. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
23102861
Volume :
8
Issue :
9
Database :
Complementary Index
Journal :
Gels (2310-2861)
Publication Type :
Academic Journal
Accession number :
159272760
Full Text :
https://doi.org/10.3390/gels8090581