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Optical properties of PDMS–O–M hybrids (M = Al, Ti, Zr, Nb or Ta) prepared using M-alkoxides. (a) UV-VIS transmittance spectra for hybrids prepared with metal alkoxide to PDMS ratio of 4; (b) Change in refractive index with metal alkoxide to PDMS molar ratio for various hybrids. Reproduced with permission from Yamada et al., Journal of Sol–Gel Science and Technology; published by Kluwer Academic Publishers, 2000.
