纳米CaCO_3/TiO_2复合粒子制备超疏水膜

Preparation of superhydrophobic surfaces with nano-CaCO_3/TiO_2 composite particles

采用溶胶-凝胶法,用γ-(2,3-环氧丙氧基)丙基三甲基氧硅烷和油酸修饰纳米CaCO3/TiO2复合粒子,制备具有类似荷叶表面形貌的超疏水涂层。结合扫描电镜、红外光谱、热重和示差扫描量热仪对复合粒子进行表征。结果表明,纳米TiO2粒子物理复合在纳米CaCO3表面,复合粒子经修饰后引入了疏水性的甲基,形成纳米复合双重粗糙结构,使所制备的涂层表现出优良的超疏水性能,其中接触角为162.1°,滚动角7°。

A similar lotus leaf superhydrophohic surface was obtained by using（-glycidyIpropyltrimet-hoxy trimeth yloxonium silane and oleic acid modified nano-CaCOa/TiO2 composite particles from the sol-gel method. The coatings were characterized by scanning electron microscopy, fourier transform infrared spectroscopy, thermogravimetry and differential scanning calorimeter. The results showed that nano-CaCOa surfaces were physically combined with nano TiO2 particles,and composite particles were modified after grafted by the hydrophobic methyl, and formated nanocrystalline composite double roughness structures. The novel surface coating containedcomposite particles with excellent superhydrophobicity and a wa ter contact angle of about 162. 1° and a sliding angle of 7° was prepared.