It might look silly, but researchers reported that after hydrothermal treatment of nanoparticles with some solvents and chemicls, different structural morphology are formed. Some pointed out that it is formed during acid or base washing. For example, do we poured down the solvent and then add water and later the acid or base. or do we add the water, acid or base in the solution , mix thoroughly and then filter? Pls i need your contributions