Rapid synthesis of Super Insulation silica aerogel composites strengthened with mullite fibers

DOI

10.2991/iccte-16.2016.228How to use a DOI?

Keywords

Sodium silicate; Silica aerogel; Mullite fibers; Mechanical property; Thermal conductivity;

Abstract

In this study, we tried to synthesize super insulation and hydrophobic silica aerogel doped with mullite fibers (10wt %), by using cost effective processing from sodium silicate. Before dried under ambient pressure, the surfaces of the gels were modified using trimethylchlorosilane (TMCS) via one-step solvent exchange and surface modification. And the proper molar ratio of TMCS to pore water is 0.02. The obtained aerogel doped with fibers exhibited excellent physical properties with less than 10% volume shrinkage, extremely high specific surface area (762 m2/g) and super hydrophobicity (contact angle of~145°). In addition, DMA and Hot-Disk results indicated that composite aerogels also with excellent performance in multitudinous physical properties, such as excellent heat insulation (0.0225 W/ (m K)) and better mechanical property (12.5 MPa). Thermal conductivity coefficients of silica aerogel monoliths changed from 0.0225 to 0.0393 W/ (m K) as temperature increased to 500°C, revealed an excellent heat insulation effect during thermal process.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Guangwu Liu
AU  - Yangang Liu
PY  - 2016/01
DA  - 2016/01
TI  - Rapid synthesis of Super Insulation silica aerogel composites strengthened with mullite fibers
BT  - Proceedings of the 2016 International Conference on Civil, Transportation and Environment
PB  - Atlantis Press
SP  - 1300
EP  - 1304
SN  - 2352-5401
UR  - https://doi.org/10.2991/iccte-16.2016.228
DO  - 10.2991/iccte-16.2016.228
ID  - Liu2016/01
ER  -