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US 2023/0416099 A1Published application
Silica wet gel and aerogel
AssigneeCardinal CG Company
InventorsReaz CHOWDHURY, Mohammad ARIFUZZAMAN, Kellen KITZMAN, Kari B. MYLI
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Abstract
The invention provides silica wet gel, silica aerogel, and methods that can be used to form an enhanced silica aerogel sheet having fewer optical defects along with other desirable properties.
Claims23
A method of making a silica aerogel, comprising the steps of:
- synthesizing a silica wet gel from methyl silicate 51;
- aging the silica wet gel for an aging time period until structural changes of the silica wet gel no longer occur;
- subjecting the silica wet gel to solvent extraction with methanol for an extraction time period;
- drying the silica wet gel to form a silica aerogel having a linear shrinkage value of 3% or less, a visible transmission greater than 98% and a haze value of 2.5% or less.
1 more element
A silica aerogel synthesized from methyl silicate 51 and having a visible transmission of at least 98% and a haze value of 2.5% or less, wherein the silica aerogel further includes at least one of the following features (A) through (E):
- (A) a thermal conductivity in air of 13 mW/mK or less;
- (B) a flexural modulus of 800 kPa or less;
- (C) a specific surface area of at least 800 m2/g;
- (D) a maximum resilience at breaking point of greater than 300 J/m3;
- (E) less than 3% methanol remaining within the silica aerogel sheet.
2 more elements
Dependencies are inferred from the claim text.