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.
Liu
Xiangmei
X
Functional Nanomaterials Laboratory, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancun Beiyitiao 2, Haidianqu, Beijing 100190, China.
He
Junhui
J
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