I have synthesis iron oxide nanoparticles need surface modification when introduce TEoS I got silane layer but not Oh group .Since this Oh group is necessary for further introduction of double bond .
Have you done preparation through a basic solution?
When alkoxy silanes are coupled with metals, usually it is assumed, that the Si-OH groups formed during the hydrolysis of the alkoxy-silane react with each other (giving rise to Si-O-Si bonds) but also withe metal-hydroxide groups formed on the suface of oxidized metals. After careful drying and "baking" the Si-OH and the metal-OH bonds disappear. Please find attached an old paper of mine and my coworkers, in which we studied the attachment of trimethoxy-vinlysilane to Al, epoxy and plasma-treated polyethylene surfaces.
Dear Hedyeh,
For me, it seems not a problem disappearing the so called silanol OH group in your IR spectra, as those silanol groups may attached fully with the surface functional groups of the iron oxide np, if you have done a stoicheomethic sinthesis of coated nanomaterials.
The following image clearly describe the involvement of silanlol OH s to form Si-O-M link which results unavailability of OHs on the surface of the modified np.
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