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摘要
For a surface to be superhydrophobic a combination of surface roughness and low surface energy is required. In this study, polyorganosiloxane superhydrophobic surfaces were fabricated using a sol-gel and heat treatment process followed by coating with a nanosilica (SiO2) sol and organosiloxane 1, 1, 1,3,5,5, 5-heptamethyl-3-[2-(trimethoxysilyl)ethyl]-trisiloxane (beta-HPEOs). The nano-structure was superimposed using self-assembled, surface-modified silica nanoparticles, forming two-dimensional hierarchical structures. The water contact angle (WCA) of polyorganosiloxane superhydrophobic surface was 143.7 +/- 0.6 degrees, which was further increased to 156.7 +/- 1.1 degrees with water angle hysteresis of 2.5 +/- 0.6 degrees by superimposing nanoparticles using a heat treatment process. An analytical characterization of the surface revealed that the nano-silica and polyorganosiloxane formed a micro/nano structure on the films and the wetting behaviour of the films changed from hydrophilic to superhydrophobic. The WCA of these films were 143.7 +/- 0.6 degrees and at heat treatment temperatures of less than 400 degrees C, the WCA increased from 144.5 +/- 0.7 degrees to 156.7 +/- 1.1 degrees. The prepared superhydrophobic films were stable even after heat treatment at 430 degrees C for 30 min and their superhydrophobicity was durable for more than 120 days. The effects of heat treatment process on the surface chemistry structure, wettability and morphology of the polyorganosiloxane superhydrophobic films were investigated in detail. The results indicated that the stability of the chemical structure was required to yield a thermally-stable superhydrophobic surface.
- 出版日期2016-12-30
- 单位东华大学
