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Raman spectra of Ti-PDMS hybrid materials prepared using PDMS-OH precursors with viscosities of (a) 25 cSt, (b) 50 cSt and (c) 750 cSt for different TIP/PDMS-OH molar ratios. The spectra are normalized to the Si–O–Si band at 495 cm−1. (d) Normalized intensity of the band at 1030 cm−1 assigned to asymmetric stretching of Ti–O–Si bonds as a function of the TiO2 vol. %.
