I have tried multistep dilution/neutralization process getting silica-gel like material that was aged for about one week in open baker. It resulted in coarse particles with size of 10-100 microns. I did not manage pH control properly, I think. What should be improved in multistep process in order to get particles at level of 0.1 micron ? How to stabilize product to keep them at this size for several month ?

Thank you very much for any help on this subject !

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