1, the sol itself is a nano-material uniformly dispersed in the liquid phase, that is, the sol prepared by the precursor in the first step is nano-scale, but under normal circumstances it is not real titanium dioxide, but a hydrate;

2. After gelation, only particles overlap, and it is still nano titanium dioxide hydrate;

3. If titanium dioxide is to be obtained, it usually needs to be calcined at a temperature of at least 400 degrees, but in the case of inappropriate additives, the particles are sintered, and the final product is not necessarily nano-materials.

4. I hope it is useful to the landlord.