Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 162, Issue -, Pages 346-353Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2015.05.077
Keywords
Two-step surface modification; Sodium silicate; Ambient pressure drying; Fiber reinforced; Shape-controllable; Thermal conductivity
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Funding
- National Natural Science Foundation of China [11372263]
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The shape-controllable sodium silicate based fiber reinforced silica aerogel monoliths with excellent integrity and thermal insulating property were prepared by ambient pressure drying. The non-woven silica fiber up to 17.5 wt% could be uniformly distributed and well incorporated into the three-dimensional silica network since the fiber introduced and silica precursor could simultaneously react with methyltriethoxysilane (MTES) and trimethylchlorosilane (TMCS) during the two-step surface modification. The densities and porosities of the composite silica aerogel monoliths were 0.104-0.146 g/cm(3) and 93%-95%, respectively, with the thermal conductivities of 21-31 m W/(m K) and the average modulus of 323-535 kPa. The characteristic linear and zigzag responses were observed from the compression stress strain curves. Incomplete modification due to a large amount of fiber incorporation led to severe volume shrinkage during ambient pressure drying. (C) 2015 Elsevier B.V. All rights reserved.
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