I am working on sol gel process but my sol is taking very long time to convert into the gel so is there any gelling agents which can convert the sol into gel in some quick time or even less time usually sol take to convert into gel.
If yes so is it effect the actual structure of the sample to be synthesized or gone away during high temperature calcination.
thanks
is it stimuli responsive gelator? also strongly depends on solvent, try with mixture of 2-3 solvents
I usually make metal oxides by sol gel technique so please suggest some good gents which can convert sol into gel in less time.............
A two step acid-base hydrolysis and condensation might work. A dilute acid like HCl can catalyze the hydrolysis while a base like Ammonium hydroxide can expedite the condensation. So, you can add acid first, stir for a while and add base and again stir for a while and let it sit for some time before gel is formed. This at least works for silicon based sol-gel process.
for any metal ethoxide salts, acid or base catalysed hydrolysis and temperature enhance the rate of reaction.
In my personal opinion, slow gelation process is better than fast gelation. For metal oxides, you can use a citric acid as an agent gelation.
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