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xufeigao

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For aprotic solvents , attractive interactions
between particles become greater than those
observed in ethanol. Agglomerates of SiO2-ST are formed
as the alkoxysilane polymerizes, resulting in the formation
of a particulate gel structure. Then, TEOS can polymerize
on the agglomerates and between the cavities formed by
the aggregates of the colloidal silica added. Thus, a
decrease in the final porosity of the composites is generated.
The resultant material is more compact, with high
roughness.

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