Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 17, Pages 21262-21268Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.08.173
Keywords
Aerogel; Hydrophobic; Flexible; Mechanical properties; Thermal properties
Categories
Funding
- National Natural Science Foundation of China [11672031, 11472038]
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Highly flexible and hydrophobic silica aerogels were synthesized using methyltriethoxysilane and poly-dimethysiloxane as precursors via two-step acid-base catalyzed sol-gel and supercritical drying. The effects of different precursor and catalyst content on mechanical properties, thermal properties, and contact angles of aerogels were investigated. The aerogels prepared here can be compressed to as high as similar to 50% of original length and recovered back to their original length. The aerogels showed the hydrophobicity with a water contact angle of 145.6 degrees and low thermal conductivity of 0.0338 W/(mK). Thermal gravimetric analysis shows that the aerogels were thermally stable up to 350 degrees C. The mechanical and thermal mechanisms of the silica aerogels were also studied. The prepared silica aerogels that were highly flexible, hydrophobic, and lightweight can be applied in thermal insulation of irregular parts, such as pipelines and outdoor attire that are exposed to moist circumstances as well.
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