硅烷-二氧化硅涂层的疏液性能研究

Study on the Hydrophobic Performance of Silane-silica Coatings

具有优异疏液性能的仿生材料目前备受关注,但此类材料对环境的潜在影响同样不容忽视。因此,受荷叶“自清洁效应”的启发,本文以不含氟的试剂-正癸基三乙氧基硅烷与正硅酸乙酯(TEOS)为原料,通过化学法制备二氧化硅颗粒,并对经硅烷修饰后得到的二氧化硅颗粒进行疏液性能测试。我们通过傅里叶变换红外光谱(FT-IR)和X射线能谱分析(XPS)对改性后的二氧化硅颗粒的化学结构进行研究;通过扫描电子显微镜(SEM)观察硅烷-二氧化硅颗粒的形貌和微观结构。通过接触角测试研究了硅烷-二氧化硅(C-SiO_(2))涂层对不同液体的疏液性能。结果表明,经化学反应得到的硅烷-二氧化硅颗粒的粒径大小不一,形成不规则表面,同时具有低表面能物质,使涂层的表面能更小,对各种液体的疏液性能更佳。因此,经正癸基三乙氧基硅烷修饰后的SiO2颗粒能够显著提高其疏液性能。此研究为后续开发无氟超疏液材料提供理论基础。

Biomimetic materials with excellent hydrophobic properties are attracted much attention, but the potential impact of such materials on the environment cannot be ignored. Therefore, inspired by the “self-cleaning effect” of lotus leaf, this paper uses the fluorine-free reagent-N-decyl triethoxysilane and ethyl silicate(teos), and tests the hydrophobic performance of the silica particles obtained after silane modification in this paper. We study the chemical structure of modified silica nanoparticles by fourier transform infrared spectroscopy(FT-IR) and x-ray spectroscopy(XPS), and observed the morphology and microstructure of silane-silica nanoparticles by scanning electron microscope(SEM).The hydrophobic properties of the silane-silica coating for different liquids were investigated by contact angle test. The results show that the silane-silica particles obtained by chemical reaction have different particle sizes, forming an irregular surface, and have low surface energy substances, which makes the coating surface energy smaller and have better hydrophobic properties for various liquids. Herein, the SiO_(2)nanoparticles modified with N-decyl triethoxysilane are able to significantly improve their hydrophobic properties. This study provides a theoretical basis for the subsequent development of fluorine-free superhydrophobic materials.