The dissolution of the silica at high pH was extensively studied for amorphous and crystalline silica at different conditions. please refer to:
Article Dissolution kinetics of silica glass as a function of pH bet...
Article The Dissolution Kinetics of Quartz as a Function of pH and T...
Article Dissolution and Precipitation of Silica at Low Temperature
and many other studies.
The dissolution of the nanoparticles is expected to be faster due to the higher surface area and surface energy.
Yes, the silica will rapidly dissolve forming silicate. Why would you want to do this?
The reason for mixing ludox with sodium silicate is the hope to obtain silica with low pore size and volume. After the mixing, the mixture is titrated by an acid in order to get a gel. Than the gel is dried and dried silica is obtained. I hope that this dried silica will have lower pore size and volume compared to a dried silica obtained by the same procedure from sodium silicate or ludox alone.
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