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De Hevesy dissolved the medals in acid, creating a colloidal sol so dark it was virtually black.
Monoliths doped with azurin were prepared adding the protein to the buffer solution to be mixed with the sol .
This concept does not entail the simultaneous existence of a silica gel and a sol , but rather a coexistence of short-chain silica polymers and monosilicic acid that condense to form quartz fibers.
At this stage the mixture is known as a sol , and contains sufficient energy for the molecules to move freely in the mixture.
Conversely, in areas where the silica was less concentrated, a gel would not form; rather, horizontal Uruguay bands would form by precipitation and settling out of silica crystallites from the aqueous sol .
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