期刊
APPLIED SURFACE SCIENCE
卷 314, 期 -, 页码 530-536出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2014.06.170
关键词
Transparent superhydrophobic surface; Grid pattern; Molding; Polydimethylsiloxane (PDMS); Nanosecond pulsed laser
类别
资金
- Special Research Fund of Mechanical Engineering at the University of Ulsan
Herein we describe an economical method to fabricate a transparent superhydrophobic surface that uses grid patterning, and we report on the effects of grid geometry in determining the wettability and transparency of the fabricated surfaces. A polymer casting method was utilized because of its applicability to economical manufacturing and mass production; the material polydimethylsiloxane (PDMS) was selected because of its moldability and transparency. PDMS was replicated from a laser textured mold fabricated by a UV nanosecond pulsed laser. Sapphire wafer was used for the mold because it has very low surface roughness (Ra <= 0.3 nm) and adequate mechanical properties. To study geometric effects, grid patterns of a series of step sizes were fabricated. The maximum water droplet contact angle (WDCA) observed was 171 degrees. WDCAs depended on the wetting area and the wetting state. The experimental results of WDCA were analyzed with Wenzel and Cassie-Baxter equations. The designed grid pattern was suitably transparent and structurally stable. Transmittance of the optimal transparent superhydrophobic surface was measured by using a spectrophotometer. Transmittance loss due to the presence of the grid was around 2-4% over the wavelength region measured (300-1000 nm); the minimum transmittance observed was 83.1% at 300 nm. This study also demonstrates the possibility of using a nanosecond pulsed laser for the surface texturing of a superhydrophobic surface. (C) 2014 Elsevier B.V. All rights reserved.
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