ABSTRACT

The experimental work on the self-cleaned zirconia coatings prepared using a co-precursor sol–gel method is presented here. The zirconia coatings were synthesised using zirconium n-propoxide (ZrPro) precursor and different organosilanes such as trimethyl cholorosilane (TMCS), hexamethyl disilzane (HMDZ) and perfluorodecyl triethoxy silane (FDTES) as co-precursors. The organosilanes have a profound impact in modifying the surfaces making them water repellent. Therefore, the influences of various organosilane co-precursors on the chemical structure, thermal stability, hydrophobicity and roughness of the zirconia coatings were studied by varying the ZrPro:Co-precursor molar ratios. FTIR spectra of zirconia coatings revealed the high intensity of peaks related to C–H, Si–C and Zr–O–Si chemical bonds manifesting their hydrophobic characteristics. The TMCS and HMDZ co-precursors-based hydrophobic zirconia coatings retained their hydrophobicity up to a temperature of 300 °C as confirmed from TG-DSC analyses. The maximum contact angle of 154° and roughness of nearly 0.316 μm were measured for zirconia coatings prepared using the ZrPro:TMCS molar ratio of 0.3. These superhydrophobic zirconia coatings can be applied for the self-cleaning purpose.

摘要

这里介绍了使用共前体溶胶-凝胶法制备的自清洁氧化锆涂层的实验工作。使用锆n合成氧化锆涂层丙氧基 (ZrPro) 前体和不同的有机硅烷，如三甲基氯硅烷 (TMCS)、六甲基二硅氮烷 (HMDZ) 和全氟癸基三乙氧基硅烷 (FDTES) 作为共前体。有机硅烷在改性表面使其具有防水性方面具有深远的影响。因此，通过改变ZrPro：共前体摩尔比，研究了各种有机硅烷共前体对氧化锆涂层的化学结构、热稳定性、疏水性和粗糙度的影响。氧化锆涂层的 FTIR 光谱揭示了与 C-H、Si-C 和 Zr-O-Si 化学键相关的高强度峰，显示了它们的疏水特性。TG-DSC 分析证实，基于 TMCS 和 HMDZ 共前体的疏水氧化锆涂层在高达 300°C 的温度下仍保持其疏水性。对于使用 0.3 的 ZrPro:TMCS 摩尔比制备的氧化锆涂层，测得的最大接触角为 154°，粗糙度接近 0.316 μm。这些超疏水氧化锆涂层可用于自清洁目的。