I was trying to make some alcogels and either the solution remained un-changed or it solidified quickly and crumpled. I was not able to make the gel. Any ideas?
Alcogel (wet gel):
At the gel point, the mixture forms a rigid substance called an alcogel. The alcogel can be removed from its original container and can stand on its own. An alcogel consists of two parts, a solid part and a liquid part. The solid part is formed by the three-dimensional network of linked oxide particles. The liquid part (the original solvent of the Sol) fills the free space surrounding the solid part. The liquid and solid parts of an alcogel occupy the same apparent volume.
chem_tr said:More acid is needed for gelation. Don't add it as a drop; add until it 'solidifies'.
chem_tr said:Maybe stirring is bad for these... I don't remember vigorous stirring conditions in this kind of gelation. So this may be the reason of your observed crumbling. Add the concentrated acid dropwise until you see the gelation. This must work.