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- W1528082783 abstract "In silica-rich silica-alumina gels, sodium ions cause a loss of surface area because of glazing on calcination of the gel. This loss is severe at high concentrations, but for sodium contents below 0.5 mass %, on a dry basis, it is negligible. Syneresis, the process of molecular rearrangement in a hydrogel, causes the mean pore diameter and particle size to increase and the particle density and surface area after calcination to decrease. This effect is caused by condensation processes involving intermicellar units and increases markedly at higher pH values because of the greatly enhanced charge density then found in the hydrogel. The syneresis effect can be used to advantage as a tool for the control of the porous structure of the gels." @default.
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- W1528082783 date "1984-01-01" @default.
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- W1528082783 title "Control of the porous structure of amorphous silica-alumina" @default.
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