一步喷涂法制备低黏附的超疏水颗粒表面

One-step spray-coating process for the fabrication of low adhesive superhydrophobic particle surfaces

采用硬脂酸和十八烷基三氯硅烷分别对商业来源的ZnO、TiO2和SiO2颗粒进行修饰得到相应的疏水颗粒.然后利用简单的一步喷涂法通过喷涂所制备的疏水颗粒的无水乙醇悬浮液制备自清洁型的超疏水颗粒表面.通过红外光谱(FT-IR)、X-射线光电子能谱(XPS)、X-射线粉末衍射(XRD)证明低表面能物质成功地修饰在这些氧化物表面;用扫描电镜(SEM)观察超疏水表面形貌发现表面团聚现象比较严重;用DSA100型接触角测量仪测量所制备的超疏水颗粒表面对水滴的静态接触角高达160°,滚动角小于5°,说明该表面具有良好的超疏水性能.

Hydrophobic particles are obtained by functionalizing the commercially available particles such as ZnO, TiO2 and SiO2 with low energy materials like stearic acid（SA） and octadecyltriehlorosilane （OTCS）. And then a facile one-step spray-coating process is developed for the fabrication of superhydrophobic particle surfaces by spraying hydrophobic particle suspensions onto desired substrate. The as-prepared superhydrophobic particle surfaces exhibit both superhydrophobicity and self-cleaning properties. The samples are characterized by Fourier transformation infrared spectra （FT-IR）, X-ray photoelectron spectroscopy（XPS） and X-ray diffraction（XRD）, indicating that ZnO, TiO2 and SiO2 are successfully modifed with low energy materials. The as-prepared surfaces are charaterized by scanning electron microscopy（SEM）, showing that the agglomeration of these surfaces is serious, which leads to superhydrophobicity. The superhydrophobic surfaces show a contact angle larger than 160° and a sliding angle smaller than 5°, which is measured on a Kruss DSA 100 apparatus at ambient temperature. The results indicate that these surfaces have good superhydrophobicity.