One-step hydrothermal creation of hierarchical microstructures toward superhydrophilic and superhydrophobic surfaces.
This article describes a simple and convenient method to fabricate hierarchically structured coatings on glass substrates from soda lime glass by one-step hydrothermal method. The surfaces of the coatings are rough and are composed of flower-like particles assembled by nanoflakes or urchin-like particles constructed by nanowires. These rough surfaces exhibit superhydrophilicity, their water contact angles reaching 0 degrees in less than 40 ms. After surface modification by 1H,1H,2H,2H-perfluorooctyltriethoxysilane, the wetting properties of these coatings switch from superhydrophilicity to superhydrophobicity, with water contact angles as high as 160 degrees and slide angle as low as 1 degrees . The formation mechanism of the hierarchically structured coatings is discussed in detail on the basis of experimental results.
Functional Nanomaterials Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancun Beiyitiao 2, Haidianqu, Beijing 100190, China.
Xiangmei
X
Liu
Junhui
J
He
D005898:Glass / Q000737:chemistry*; D057927:Hydrophobic and Hydrophilic Interactions; D012821:Silanes / Q000737:chemistry; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors; D017155:Wettability
D012821:Silanes