Abstract: Micron scale rough structures of titanium alloy substrate were acquired by laser manufacturing. Nanoscale rough structures were prepared by painting epoxy acetone solution and silica suspension subsequently. Superhydrophobic duplex-treated film was fabricated by perfluorodecyltrichlorosilane self-assembled monolayers deposited on micro- nano structures. Surface profiler, scanning electron microscope, and contact angle measurement were used to analyze the surface properties, and wettability of the specimens. It showed that micro- nano structures by laser manufacturing and nano-silica play an important role in preparing superhydrophobic surfaces. Contact angles on duplex-treated film increased initially and then decreased with increasing concentration of silica suspension, and finally stabilized at around 150 °. The maximum contact angle of 159 ° was acquired when the concentration of silica suspension was 12.0 g/L.

Key words: epoxy resin, nano-silica, laser manufacturing, micro- nano structure, superhydrophobicity, surface