US9073759B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9073759-B2 |
| Application number | US-201113206087-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 9, 2011 |
| Priority date | Aug 10, 2010 |
| Publication date | Jul 7, 2015 |
| Grant date | Jul 7, 2015 |
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Silica aerogels with improved properties are disclosed together with methods for synthesizing such aerogels. The improved properties include lower thermal conductivity (better insulating capacity), lower acoustic velocity, lower dielectric constant and improved ductility. Greater tunability of the refractive index can also be achieved. The silica aerogels are prepared by a sol-gel processing method that provides better control of the formation of aerogel structures. Generally speaking, the improvements arise from control of the synthesis to create a morphology of primary clusters and diverse-sized secondary clusters of dense silica aerogels separated by less densely packed regions. By providing a broader range of secondary clusters and/or pore sizes and loose connectivity between clusters, reductions can be achieved in thermal conductivity and flexural modulus.
Opening claim text (preview).
What is claimed is: 1. A silica aerogel, free of a non-silica content, comprising: a network of primary silicate clusters comprising silica particles having diameters from 1 to 10 nm interconnected to form diversely-sized secondary silicate clusters having diameters greater than 20 nm, a porosity of greater than about 80 percent, a diverse range of pore sizes with pores of less than 5 nm in size and pores greater than 50 nm in size, wherein the range of pore sizes exhibits a d…
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
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