研究目的
Investigating the fabrication of superhydrophobic surfaces on aluminium alloy 7075 using a two-step nanosecond laser fabrication method to enhance water repellence.
研究成果
The two-step fabrication process with nanosecond laser source followed by vacuum processing can significantly enhance water repellence in a short interval of time. The introduction of a layer of nanoscale structures improves the wetting state from rose petal to lotus effect with high static contact angle and low roll off angle.
研究不足
The study is limited to aluminium alloy 7075 and the specific conditions of laser processing and vacuum storage. The effect of other materials or processing conditions was not explored.
1：Experimental Design and Method Selection:
A two-step nanosecond laser fabrication method was used to create micro and dual scale (micro and nano) structures on aluminium alloy
2：Sample Selection and Data Sources:
70 Aluminium alloy 7075 plates were used as received.
3：List of Experimental Equipment and Materials:
Ytterbium fiber laser Omron MX-MI20B, scanning head (intelliSCAN 30, Scanlab), SEM Tescan FERA 3, laser scanning confocal microscope Olympus OLS5000, AXIS Supra photoelectron spectrometer (Kratos Analytical Ltd.).
4：Experimental Procedures and Operational Workflow:
First, micropillars were fabricated with a focused laser beam. Then, a defocused beam was applied to introduce nano-scale features. Samples were placed in high vacuum for 4 h.
5：Data Analysis Methods:
Surface wettability was evaluated by the Sessile drop technique. Surface chemistry was analyzed by XPS.
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