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Traditionally, silicon dioxide aerogels have been synthesized using supercritical drying methods, but this has certain limitations in terms of its cost efficiency, process continuity, and safety because a high-temperature and pressure are needed to approach the critical point. If liquid carbon dioxide were used as a solvent in the low-temperature supercritical drying process, the chemical durability of the aerogels in the atmosphere would be gradually decreased, since the aerogel particles are hydrophilic. To overcome these problems, Brinker introduced a commercially attractive ambient pressure drying method for the production of silicon dioxide aerogels.

As silicon alkoxide precursor is reactive enough to form gel networks with other metal oxides, several studies were carried out to synthesized silicon dioxide aerogel composites for various applications. Structural and magnetic properties of silicon dioxide aerogels-iron oxide nanocomposites were studied by Casas et al. Aerogel technology is the basis for the technical support of nano silicon dioxide aerogels insulation technology. Aerogel, also known as dry gel. When the gel off most of the solvent, the gel content is much less than in the liquid solids or gels spatial mesh structure filled with the medium is a gas, as a solid appearance, it is the dry gel, also called airgel.



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