No problem
Dear Aniruddh Bahadur Yadav,
You must hold the solution at 70°C for one hour before aging. You can read the experimental part of my article where this is explained.
Article Influence of Pb and Co-doping on photocatalytic degradation ...
Dear A. B. Yadav,
Before mixing raise the temperature upto 60 °C and then add DEA slowly in the ZA solution.
I did that some time ago. It become thick gel like cream when heated the solution.
Is sol-gel preparation depends on the gravity and place of experiment.
Maybe you chose a high temperature that caused your solution to gel. As for gravity, I don't think it will have any effect.
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