Thermodynamic research on the coating process of silica nano film on titanate particles surface

The critical nucleation radius is 2.8 nm obtained from calculation with the rmodynamic method. If the nucleus caused by fluctuation is less than 2.8 mn , the nucleus will not grow up. Though the thermodynamic analysis is semi-i deal, it is effective. We find a solution system in which the nucleation do es not take place uniformly, but does on the surfaces of different solid ph ases. It gives a feasibility theoretically for titanate being coated unifor mly with silica nanofilm and a single phase of silica not being formed.