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STRUCTURE MODIFICATION OF HYBRID ZIRCONIUM SOL-GEL COATINGS

Violeta Purcar

Abstract

This paper reports the synthesis of hybrid zirconium sol-gel coatings by solпїЅgel process at room temperature (25 пїЅC), using tetraethoxysilane (TEOS) as a precursor and different alkyltriethoxysilanes (RTES) with variable organic functionality (methyl, vinyl and octyl) as surface modifying agents. All silica materials was prepared with zirconium(IV) propoxide (as cross-linking agent), by keeping the molar ratio of TEOS:RTES at 1:1, in acidic conditions. The zirconium sol-gel films were obtained by depositing the final solution on a glass slide. We investigated the structure of the resulting films through Fourier transform infrared (FT-IR), UVпїЅVIS-NIR spectrometry, and water contact angles measurement. All FT-IR spectra of hybrid films exhibit broad absorption bands located at 798 cm-1 and 1098 cm-1, respectively, which are assigned to the Si-O-Si symmetric and asymmetric stretching vibrations, and the band at 949 cm-1 corresponding to the Si-O group. It was observed that the obtained silica films present wettability properties when the RTES with hydrophobic organic group is added in solgel synthesis. The higher value of static water contact angle was obtained for the silica film prepared with TEOS+OTES (100пїЅ8пїЅ). The prepared hybrid coatings showed film uniformity and optical transparence.

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DOI resolver: doi.org/10.5593/sgem2017/61/s24.043

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