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Walters, J.K.; Rigden, Jane S.; Dirken, P.J.; Smith, Mark E.; Howells, W.S.; Newport, Robert J. (1997)
Languages: English
Types: Article
Subjects: Q
Neutron diffraction data is used to reveal details of the effect of adding titania to a silica-based sol-gel, including a first direct observation of the Ti-O correlation, At low Ti contents the data are consistent with the 4-fold oxygen coordination derived from NMR. Even at these concentrations the silica network is shown to have been affected significantly, with bond-length distributions being narrowed, and with a high level of network-OH indicating a qualitative change in the mesoscopic structure associated with interfacial surfaces, Data on a phase separated sample supports the conclusion that the network-OH is associated with the phase separation process.
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