The binding of proteins (and cells) to glass (or silicon) surfaces can be prevented by coating the glass with polyethylene glycol (PEG) groups. PEG-silane is a reagent used to create this coating.
PEG-silane (the image shows a methoxy- version) (image taken from here; no connection) will coat glass surfaces because the silane portion (right hand end of the structure shown) will react with -OH groups on the glass surface.
I can't help with the part of the question about time and temperature of incubation, but it seems longer and hotter than protocols I have seen. Perhaps the indium tin oxide (ITO) coating on the slides has something to do with it?
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