NDLI: Influence of thermal process on microstructural and physical properties of ambient pressure dried hydrophobic silica aerogel monoliths

Content Provider	Springer Nature Link
Author	Liu, Guangwu Zhou, Bin Ni, Xingyuan Shen, Jun Wu, Guangming Du, Ai Zu, Guoqing
Copyright Year	2012
Abstract	The experimental results of thermal process on the microstructural and physical properties of ambient pressure dried hydrophobic silica aerogel monoliths are reported and discussed. With sodium silicate as precursor, ethanol/hexamethyldisiloxane/hydrochloric acid as surface modification agent, the crack-free and high hydrophobic silica aerogel monoliths was obtained possessing the properties as low density (0.096 g/cm$^{3}$), high surface area (651 m$^{2}$/g), high hydrophobicity (~147°) and low thermal conductivity (0.0217 Wm/K). Silica aerogels maintained hydrophobic behavior up to 430 °C. After a thermal process changing from room temperature to 300 °C, the hydrophobicity remained unchanged (~128°), of which the porosity was 95.69% and specific density about 0.094 g/cm$^{3}$. After high temperature treatment (300–500 °C), the density of final product decreased from 0.094 to 0.089 g/cm$^{3}$ and porosity increased to 96.33%. With surface area of 466 m$^{2}$/g, porosity of 91.21% and density about 0.113 g/cm$^{3}$, silica aerogels were at a good state at 800 °C. Thermal conductivities at desired temperatures were analyzed by the transient plane heat source method. Thermal conductivity coefficients of silica aerogel monoliths changed from 0.0217 to 0.0981 Wm/K as temperature increased to 800 °C, revealed an excellent heat insulation effect during thermal process.
Starting Page	126
Ending Page	133
Page Count	8
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	62
Issue Number	2
e-ISSN	15734846
Language	English
Publisher	Springer US
Publisher Date	2012-03-03
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Silica aerogel monoliths Sodium silicate Thermal process Thermal conductivity Ceramics, Glass, Composites, Natural Methods Nanotechnology Optical and Electronic Materials Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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