I have primed steel surface with acrylic paint and coated with Nano-fibrillated cellulose for surface roughness. My objective is to make steel surface superhydrophobic after the coat of NFC i wanted to use perfluorooctyltrichloro silane for achieving low surface energy. How to know the amount of silane to be used. For the modification process I am planning to follow the CVD process conducted in sealed beaker. Please help me out in calculating the amount of silane.
When you use trichloro (or really any non-monofunctional) silanes you will have self-condensation of the silane ie it will react with itself as well as the surface. Silanols are more reactive with other silanols than C-OH groups, so the preferred reaction is actually the self reaction. Because of this, what you are asking is not really too important. The majority of the silane you add will not directly react with the cellulose.
If you are looking for an order of magnitude estimate, what is the size of your beaker? For a few 100 mL beaker, something on the order of 10 - 50 µL will be sufficient.
